A movie subtitle synchronous display device and a control method thereof

Abstract

The application relates to a movie subtitle synchronous display device and a control method thereof, and belongs to the technical field of movie projection auxiliary equipment. A main control module is internally provided with synchronous control software, is electrically connected with all other modules, and is responsible for operation control, data processing and synchronous algorithm operation of the whole device; a signal receiving module is used for being connected with a movie projection device, receives an SMPTE time code signal and projection state information; a subtitle storage module is used for storing subtitle files and supporting simultaneous loading of multi-language subtitle files; a subtitle decoding driving module is responsible for converting subtitle texts into driving signals recognizable by a display screen; a display screen module is used for displaying subtitle contents; and a power module provides stable power supply for the whole device. The application can automatically receive a time code and accurately control movie subtitle synchronous display, realizes double-mode high-precision automatic synchronization, realizes fine play control, reduces operation cost, and is suitable for multi-scene projection requirements.

Description

Technical Field

[0001] This invention relates to a movie subtitle synchronization display device and its control method, belonging to the technical field of movie projection auxiliary equipment. Background Technology

[0002] Currently, subtitles for digital films shown in commercial cinemas are typically in the form of "hard subtitles" or "embedded subtitles." That is, during the film's production and distribution phase, the subtitles are directly compressed and burned into the digital cinema package (DCP), becoming an integral part of the film's visuals. In this mode, cinema projection equipment only needs to play the DCP file normally, and viewers can directly see the subtitled image without requiring additional subtitle display equipment. However, the aforementioned embedded subtitle mode has the following inherent drawbacks and application limitations: ① Unable to meet the multilingual screening needs of films without subtitles According to industry practice and technical specifications, Digital Cinema Packages (DCPs) are the standard format for film distribution. DCP files have the following characteristics: Technical secrecy: DCP files are encrypted, and projection devices require a dedicated key (KDM, Key Delivery Message) to decrypt and play them; without authorization, no third party can open, read, or modify the contents of the DCP file. Time-limited limitations: The key is usually only valid within the authorized screening period and is bound to a specific projection device, making it impossible to use or perform secondary processing on other devices. Irreversible operation: Even if theoretically a DCP could be repackaged using professional software, this process involves re-encoding the film's visuals, audio tracks, and subtitle tracks, constituting a substantial modification of copyrighted content and exceeding the legal authority of the projectionist.

[0003] At international film festivals and film screenings, the films shown usually come from different countries and regions. Many of these films, including those in competitions and those licensed from abroad, do not have Chinese subtitles in the screening copies due to copyright restrictions or issues with the film's distribution version. In some cases, they may not even have subtitles in any language at all.

[0004] Furthermore, from a practical standpoint, with hundreds of films screened during the film festival, the schedule is packed and time is tight. From the perspectives of technology, copyright, and time, modifying the DCP file to embed subtitles is completely impractical: on the one hand, modifying hundreds of films one by one would take several months, while the film festival screening window is only one to two weeks; on the other hand, each film's DCP is protected by an independent key, so the exhibitor cannot open the file and has no right to make any modifications.

[0005] Therefore, the only legal and feasible technical approach to adding Chinese subtitles to foreign films is to use an external subtitle display device that is independent of the DCP.

[0006] ② Temporary screening venues lack professional equipment support Besides film festivals, temporary screenings organized by universities, government agencies, enterprises, and communities, as well as outdoor cinema screenings, also face the problem of foreign films lacking Chinese subtitles. These scenarios are characterized by: non-fixed screening locations, short equipment deployment time, and operators who are mostly non-professionals. Current technical solutions typically involve using general-purpose playback equipment in conjunction with manually playing subtitle files. This not only results in low synchronization accuracy but also involves bulky equipment, complex wiring, and lengthy setup times, making it difficult to meet the needs of temporary and mobile screenings.

[0007] ③ Relies on manual operation, resulting in low precision and a high risk of errors. Currently, the industry lacks dedicated, standardized subtitle synchronization display equipment for the aforementioned special screening scenarios. Existing practices generally employ manual operation: subtitle operators sit in a corner of the theater, observing the film in real-time via computer software, and manually clicking to send subtitles as the actors deliver their lines. This manual synchronization method has the following problems: Low accuracy: Relying on visual observation and manual button pressing, there is a delay of more than 0.5 seconds in the reaction time, making it impossible to guarantee accurate synchronization between subtitles and the screen. Prone to errors: Prolonged operation can lead to fatigue, potentially resulting in missed, incorrect, or extra subtitles. High labor costs: A single film typically requires two subtitle operators (a lead and an assistant) on duty throughout, and they need to repeatedly familiarize themselves with the film content beforehand.

[0008] Therefore, how to provide a professional subtitle display device that can operate independently of the film projection system, achieve precise and automatic synchronization between subtitles and film content, and is easy to carry and deploy quickly has become a pressing technical problem to be solved in this field. In particular, for foreign films that cannot have subtitles embedded due to copyright reasons, and for temporary screening scenarios such as universities, institutions, and outdoor venues, there is an urgent market demand for a high-precision, easy-to-deploy, plug-and-play independent subtitle display device.

[0009] Summary of the Invention This invention proposes a movie subtitle synchronization display device and its control method, which can automatically receive timecodes and accurately control the display of movie subtitles for synchronized display, realize dual-mode high-precision automatic synchronization, fine playback control, free up manpower, reduce operating costs, adapt to the needs of multiple screening scenarios, and be compatible with multiple languages, thus solving the copyright and technical limitations of existing technologies.

[0010] The technical solution of this invention is: A movie subtitle synchronization display device includes a main control module, a signal receiving module, a subtitle storage module, a subtitle decoding driver module, a display screen module, a power supply module, and an external control interface; The main control module has built-in synchronous control software, which is responsible for the operation control, data processing and synchronous algorithm calculation of the entire device and is electrically connected to all other modules. The signal receiving module is used to connect to the movie projection equipment to receive SMPTE timecode signals and projection status information. The input end of the signal receiving module is connected to the projection equipment, and the output end is connected to the main control module. The subtitle storage module is used to store subtitle files and supports simultaneous loading of multilingual subtitle files. The subtitle storage module is connected to the main control module. The subtitle decoding driver module is responsible for converting subtitle text into driving signals that the display screen can recognize. The input end of the subtitle decoding driver module is connected to the main control module, and the output end is connected to the display screen module. The display module is used to display subtitle content and adopts an LED or LCD display screen. The display module is connected to the subtitle decoding driver module. The power module provides a stable power supply for the entire device. An optional built-in battery is available to adapt to outdoor scenarios without power. The power module is connected to all power-consuming modules. The external control interface provides manual fine-tuning functionality and is connected to the main control module.

[0011] Furthermore, the film projection equipment includes a digital cinema server; the subtitle storage module is used to store subtitle files and supports multiple formats such as SRT, ASS, and STL; the manual fine-tuning function of the external control interface includes a synchronization delay adjustment knob and a subtitle switching button.

[0012] A control method for the aforementioned synchronized movie subtitle display device, wherein the method is embedded in the main control module of the synchronized movie subtitle display device in software form, and includes two synchronized display control modes; Mode 1 is the projector timecode synchronization mode. In this mode, the device connects to the cinema projection equipment via a signal receiving module and receives the standard timecode signal from the Society of Motion Picture and Television Engineers (SMPTE) in real time. The timecode precisely represents the current position of the film playback in the format of hours:minutes:seconds:frames. The film subtitle synchronization display device compares the timecode with the timeline of the loaded subtitle file in real time and automatically displays the matching subtitle entries. This mode is suitable for professional cinema projection scenarios with timecode output interfaces and can achieve automatic synchronization with millisecond-level precision. Mode 2 is the software's own timecode operation mode. In this mode, the device does not rely on external timecode signals but operates independently through its built-in autonomous timecode generation module. The user sets the start time of the subtitle file in the software interface, and the device automatically advances the timecode according to the internal timer, matching it with the timeline of the subtitle file to achieve automatic synchronized subtitle display. This mode is suitable for the following limited scenarios: the projection device does not have a timecode output interface (such as home projectors, laptops, etc.); a signal connection cannot be established with the projector (such as temporary outdoor screenings, equipment compatibility issues); the projection device is an older model or does not support the standard timecode protocol.

[0013] In the second mode, users can precisely adjust the synchronization progress through the playback control function to ensure accurate correspondence between subtitles and video footage.

[0014] The method described in this invention has playback control and subtitle management functions, including: Basic playback controls: Play, starts playing subtitles at the current timecode position; Pause, pauses subtitle playback and stops timecode progression; Stop, stops playback and resets the timecode. Precise step control: Fast forward one second, the current timecode advances by one second; Fast backward one second, the current timecode rewinds by one second; Fast forward 100 milliseconds, the current timecode advances by 100 milliseconds, used for fine-tuning synchronization; Fast backward 100 milliseconds, the current timecode rewinds by 100 milliseconds, used for fine-tuning synchronization. Quick positioning: Slide the progress bar to quickly jump to any time point; or directly input the time code to jump, allowing users to manually enter the precise time code (hour:minute:second:frame) for the jump. Subtitle line control: Previous line, manually switch to the previous subtitle; Next line, manually switch to the next subtitle. Subtitle file processing: Subtitle file encoding conversion, supports automatic conversion of subtitle files of different encoding formats (such as GBK, UTF-8, BIG5, etc.) into system-recognizable encodings to solve garbled character problems; Single line character limit detection, automatically detects whether the number of characters in a single line of the subtitle file exceeds the maximum number of characters that can be displayed on the screen; Adaptive font size reduction, when a subtitle is detected to have a single line character limit exceeded, automatically reduces the font size of the subtitle to ensure that the complete display does not exceed the screen boundary.

[0015] The method described in this invention has an automatic synchronization matching algorithm, the synchronization matching logic of which is as follows: ① Real-time comparison: The current timecode (whether externally received or internally generated) is compared with the parsed subtitle entries in real time; ② Display judgment: When the current timecode is between the start and end timecodes of a subtitle, the subtitle is automatically sent to the subtitle decoding driver module; ③ Clearing judgment: When the current timecode exceeds the end timecode of a certain subtitle, the display is automatically cleared to prepare for the next subtitle; ④ Manual fine-tuning: Users can adjust the overall synchronization offset within a range of ±5 seconds using the delay adjustment knob or interface button. The main control module will adjust the display time of all subtitles based on this offset.

[0016] The specific workflow of the method described in this invention is as follows: ① Startup and mode selection: After the device is started, the user can select "projector timecode synchronization mode" or "software self-timecode operation mode" according to the actual scenario; ② Subtitle loading: When a user imports a subtitle file, the software automatically parses and extracts the timeline information, while simultaneously performing single-line character count exceeding detection and adaptive adjustment; ③ Synchronous operation: Enter the main operation interface, and start automatically synchronizing the display of subtitles according to the selected mode; ④ Real-time control: During operation, users can adjust the playback progress or fine-tune the synchronization accuracy at any time through the playback control function; ⑤ End: After the video finishes playing, stop running and save the current configuration.

[0017] This invention addresses the problem in existing technologies where cinema subtitle playback cannot be accurately and automatically synchronized with the film content, especially for foreign films that cannot have subtitles embedded due to DCP file copyright and technical limitations, as well as temporary screening scenarios such as universities, workplaces, and outdoor locations.

[0018] Compared with the prior art, the present invention has the following beneficial effects: ① Solve copyright and technical limitations; addressing the industry pain point that DCP files cannot be modified due to encryption and key protection, we provide an external subtitle display solution independent of DCP, which is the only feasible technical path to legally add subtitles without touching the original film; ② Dual-mode synchronization, adaptable to all scenarios; supports two modes: "projector timecode synchronization" and "software timecode operation", which is suitable for both professional cinemas and home projection, outdoor projection and other scenarios where timecode cannot be obtained, achieving full scenario coverage; ③ Achieving high-precision automatic synchronization: The automatic synchronization mechanism based on timecode controls the subtitle display error to the millisecond level, completely solving the problems of low precision and easy error in manual operation; ④ Refined playback control; provides a variety of refined functions such as millisecond-level step control, direct timecode jump, and single-line character number adaptation, greatly improving the ease of operation and subtitle display effect; ⑤ Free up manpower and reduce operating costs; no need for dedicated personnel to manually type subtitles throughout the entire process. Only one operator is needed to complete the subtitle loading and synchronization test before the start of a film, which greatly reduces the manpower cost of subtitlers for events such as film festivals (the traditional method requires 2 people to be on duty throughout the entire process). ⑥ Adaptable to multiple screening scenarios; suitable for professional screening scenarios such as film festivals (with hundreds of films screened intensively), as well as temporary screening scenarios such as universities, institutions, and outdoor venues. The equipment is small in size, lightweight, and can be equipped with a built-in battery. Deployment time is no more than 10 minutes. ⑦ Multilingual compatibility; supports multiple subtitle formats and can load multiple language subtitle files simultaneously, facilitating flexible switching during international film festivals.

[0019] This invention has been verified through practical application. The device has been successfully used in multiple film festivals, proving its stability and reliability, and has received positive feedback from organizers and audiences. Attached Figure Description

[0020] Figure 1 This is a structural block diagram of the movie subtitle synchronization display device of the present invention; Figure 2 This is a flowchart of the synchronization control method of the present invention; Figure 3 This is a schematic diagram of the device appearance according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the device usage scenario according to an embodiment of the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0022] Example 1: Screening at an international film festival (projector timecode synchronization mode) Scenario Description: During this international film festival, multiple films from different countries (such as French, Japanese, and German) need to be screened consecutively. None of these films' DCP (Digital Cinema Package) files contain Chinese subtitles, and the keys provided by the film distributors explicitly prohibit any form of modification or re-encoding of the DCP files. The festival has a dense schedule with only 15-minute intervals between screenings, requiring a subtitle solution that can be deployed quickly and operate efficiently.

[0023] Operating steps: 1. Equipment preparation and subtitle preloading The operator places the movie subtitle synchronization display device of this invention in a corner of the theater, with the device's display screen facing the audience. Before the screening begins, the Chinese subtitle files (.srt format) for multiple films are imported in batches into the device's main control module via a USB flash drive. The device supports storing multiple sets of subtitle files simultaneously and allows for quick switching within the interface.

[0024] The device automatically parses the subtitle file and performs a single-line character count exceeding limit detection. When it detects that the number of characters in a single line of a subtitle exceeds the maximum number of characters that the display screen can show, the software automatically reduces the font size of the subtitle from the default 32 to 28 to ensure that the complete display does not exceed the screen boundaries.

[0025] 2. Mode Selection and Signal Connection The operator selects "Projector Timecode Synchronization Mode" in the software interface. Using a standard cinema synchronization signal cable, the equipment's signal receiving module is connected to the SMPTE timecode output interface of the digital cinema server. The "Signal Indicator" on the equipment panel changes from red to green, indicating that the timecode signal has been successfully received.

[0026] 3. Synchronous testing and fine-tuning before screening The projectionist began a test playback, and the operator observed whether the subtitles displayed on the equipment screen were synchronized with the film dialogue. The test revealed a delay of approximately 0.1 seconds. The operator then rotated the "Delay Adjustment" knob on the panel, setting the synchronization delay to -0.1 seconds (meaning the subtitles appeared 0.1 seconds ahead). The test was repeated, and the subtitles were perfectly synchronized with the film dialogue.

[0027] 4. Formal screening and automatic operation During the film screening, the device automatically and accurately displays the corresponding Chinese subtitles based on the real-time received SMPTE timecode. No manual intervention is required; the entire process is fully automated. The device supports rapid switching between multilingual subtitle files, allowing for seamless transitions between different film screenings.

[0028] 5. Rapid switching and deployment between sites After the previous screening ended, the operator turned off the equipment power, disconnected the signal cable, and moved the equipment to the next theater. The equipment is small and lightweight, and can be carried with one hand. Reconnecting the signal and power cables and selecting the corresponding subtitle file, the entire process, from moving the equipment to deployment, took no more than 10 minutes.

[0029] Technical Results Summary: In this embodiment, the film subtitle synchronization display device of the present invention successfully solves the industry problem of DCP files being unable to embed subtitles due to copyright and technical limitations. Through the "projector timecode synchronization mode," it achieves automatic synchronization display with millisecond-level precision, completely replacing the traditional manual subtitle typing method. Simultaneously, thanks to its portability and rapid deployment capabilities, the device successfully meets the demands of intensive film festival scheduling, allowing a single person to manage screenings in multiple theaters, significantly reducing labor costs and operational complexity.

[0030] Example 2: Teaching screening in a film academy's screening room (software's own timecode operation mode) Scenario Description: A film academy is conducting a teaching screening in its auditorium, needing to play an English-language educational film and provide Chinese subtitles for students. The auditorium is equipped with home-grade projectors and laptops, lacking a professional cinema timecode output interface. The operators are academy faculty members with no professional technical background.

[0031] Operating steps: 1. Equipment preparation and power supply The operator places the movie subtitle synchronization display device of the present invention below the screen.

[0032] 2. Mode Selection and Subtitle Loading Open the device software interface and select "Software's Own Timecode Running Mode". Import the Chinese subtitle file into the device via USB flash drive or mobile phone Bluetooth. The software automatically completes the parsing and single-line character count detection. If the software detects that the single-line character count of a subtitle exceeds the width of the display screen, it automatically reduces the font size of that subtitle from the default 32 points to 28 points to ensure complete display. The software interface is simple and easy to use, requiring no professional technical training.

[0033] 3. Start Time Setting (One-Click Alignment) After the film begins playing, the operator watches the screen. The moment the image appears on the screen (such as the opening logo, the end of the black screen, or the first frame), the operator clicks the "Set Start Point" button on the software interface. The device automatically resets the current internal timecode to zero and begins synchronization.

[0034] Note: Since the SRT subtitle file corresponds perfectly to the film's timeline, as long as the starting point is aligned with the beginning of the film, subsequent subtitles are theoretically already largely matched. If there are minor discrepancies due to projection equipment delays or operational errors, precise corrections can be made using the fine-tuning function after the first line of dialogue appears.

[0035] 4. Playback control and precise fine-tuning During the projection, the operator can make precise controls at any time as needed: Synchronization Fine-tuning: If a slight lag is detected in the subtitles, click the "Rewind 100 milliseconds" button to advance the subtitles by 100 milliseconds; if the subtitles are ahead, click the "Fast Forward 100 milliseconds" button to adjust the delay. Millisecond-level precision adjustment is supported to ensure accurate synchronization between subtitles and the screen. Playback Controls: When the video is paused midway, click the "Pause" button to stop the subtitles from playing; after resuming playback, click the "Play" button to resume the subtitles from where they left off. Precise jump: When a teacher needs to review a certain section of content during a teaching discussion, the teacher can drag the video progress bar back to the specified position, and the operator can simultaneously drag the progress bar on the device's software interface, or directly enter the precise time code (such as "00:05:00:00"). The device will immediately jump to the corresponding position and continue to automatically and synchronously display the subtitles. Manual subtitle control: To manually view a subtitle, use the "Previous Line" / "Next Line" buttons to switch.

[0036] 5. Subtitle encoding compatibility handling If the imported subtitle file contains garbled characters, the operator can use the "Subtitle File Encoding Conversion" function to automatically convert different encoding formats such as GBK, UTF-8, and BIG5 into encodings that the system can recognize, ensuring that the subtitles are displayed correctly.

[0037] 6. End of screening After the video ends, the operator turns off the power to the equipment and removes it directly without disassembling any wiring.

[0038] Technical Summary: In this embodiment, the movie subtitle synchronization display device of the present invention achieves rapid and accurate synchronization benchmark setting in temporary screening scenarios without timecode signals through the "software's own timecode operation mode" and the "one-click alignment based on the start of the screen" method. Combined with refined functions such as millisecond-level step control, progress bar positioning, direct timecode jump, adaptive single-line character count, and encoding conversion, it significantly improves the ease of operation and subtitle display effect, meeting the needs of diverse scenarios such as teaching and temporary screenings, and completely replacing the inefficient traditional method of manually typing subtitles.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A control device for synchronized display of movie subtitles, characterized in that: It includes a main control module, a signal receiving module, a subtitle storage module, a subtitle decoding driver module, a display module, a power supply module, and an external control interface; The main control module has built-in synchronous control software, which is responsible for the operation control, data processing and synchronous algorithm calculation of the entire device and is electrically connected to all other modules. The signal receiving module is used to connect to the movie projection equipment to receive SMPTE timecode signals and projection status information. The input end of the signal receiving module is connected to the projection equipment, and the output end is connected to the main control module. The subtitle storage module is used to store subtitle files and supports simultaneous loading of multilingual subtitle files. The subtitle storage module is connected to the main control module. The subtitle decoding driver module is responsible for converting subtitle text into driving signals that the display screen can recognize. The input end of the subtitle decoding driver module is connected to the main control module, and the output end is connected to the display screen module. The display module is used to display subtitle content and adopts an LED or LCD display screen. The display module is connected to the subtitle decoding driver module. The power module provides a stable power supply for the entire device. An optional built-in battery is available to adapt to outdoor scenarios without power. The power module is connected to all power-consuming modules. The external control interface provides manual fine-tuning functionality and is connected to the main control module.

2. The control device for synchronized display of movie subtitles according to claim 1, characterized in that: The film projection equipment includes a digital cinema server; the subtitle storage module is used to store subtitle files and supports at least SRT, ASS, and STL formats; the external control interface has manual fine-tuning functions, including a synchronization delay adjustment knob and a subtitle switching button.

3. A control method for a movie subtitle synchronization display device according to claim 1 or 2, wherein the method is embedded in the main control module of the movie subtitle synchronization display device in software form, characterized in that... Includes two synchronous display control modes; Mode 1 is the projector timecode synchronization mode; in this mode, the device connects to the movie projection equipment through the signal receiving module and receives the standard timecode signal from the Society of Motion Picture and Television Engineers (SMPTE) in real time; the timecode accurately represents the current position of the movie playback in the format of hours:minutes:seconds:frames; the movie subtitle synchronization display device compares the timecode with the timeline of the loaded subtitle file in real time and automatically displays the matching subtitle entries; Mode 2 is the software's own timecode operation mode; in this mode, the device does not rely on external timecode signals, but runs independently through the built-in autonomous timecode generation module; the user sets the start time point of the subtitle file in the software interface, and the device automatically advances the timecode according to the internal timer and matches it with the timeline of the subtitle file to achieve automatic synchronized display of the subtitles.

4. The control method for synchronized display of movie subtitles according to claim 3, characterized in that: In the second mode, users can precisely adjust the synchronization progress through the playback control function to ensure accurate correspondence between subtitles and video footage.

5. The control method for synchronized display of movie subtitles according to claim 3, characterized in that... The method has playback control and subtitle management functions, including: Basic playback controls: Play, starts playing subtitles at the current timecode position; Pause, pauses subtitle playback and stops timecode progression; Stop, stops playback and resets the timecode. Precise step control: Fast forward one second, the current timecode advances by one second; Fast rewind one second, the current timecode rewinds by one second; Fast forward 100 milliseconds, the current timecode advances by 100 milliseconds, used for fine-tuning synchronization; Rewind 100 milliseconds, move the current timecode back 100 milliseconds, for fine-tuning synchronization; Quick positioning: Slide the progress bar to quickly jump to any time point; or directly input the time code to jump, allowing users to manually enter the precise time code (hour:minute:second:frame) for the jump. Subtitle line control: Previous line, manually switch to the previous subtitle; Next line, manually switch to the next subtitle. Subtitle file processing: Subtitle file encoding conversion, supports automatic conversion of subtitle files of different encoding formats into system-recognizable encodings, solving garbled character problems; Single line character limit detection, automatically detects whether the number of characters in a single line of the subtitle file exceeds the maximum number of characters that can be displayed on the screen; Adaptive font size reduction: When a subtitle is detected to have more characters than the limit for a single line, the font size of the subtitle is automatically reduced to ensure that it is displayed completely without exceeding the screen boundaries.

6. The control method for synchronized display of movie subtitles according to claim 3, characterized in that... The method has an automatic synchronization matching algorithm, and its synchronization matching logic is as follows: ① Real-time comparison: The current timecode is compared with the parsed subtitle entries in real time; ② Display judgment: When the current timecode is between the start and end timecodes of a subtitle, the subtitle is automatically sent to the subtitle decoding driver module; ③ Clearing judgment: When the current timecode exceeds the end timecode of a certain subtitle, the display is automatically cleared to prepare for the next subtitle; ④ Manual fine-tuning: Users can adjust the overall synchronization offset within a range of ±5 seconds using the delay adjustment knob or the subtitle switching button. The main control module will then adjust the display time of all subtitles based on this offset.

7. The control method for synchronized display of movie subtitles according to claim 3, characterized in that... The specific workflow of the method is as follows: ① Startup and mode selection: After the device is started, the user can select the projector timecode synchronization mode or the software's own timecode operation mode according to the actual scenario; ② Subtitle loading: When a user imports a subtitle file, the software automatically parses and extracts the timeline information, while simultaneously performing single-line character count exceeding detection and adaptive adjustment; ③ Synchronous operation: Enter the main operation interface, and start automatically synchronizing the display of subtitles according to the selected mode; ④ Real-time control: During operation, users can adjust the playback progress or fine-tune the synchronization accuracy at any time through the playback control function; ⑤ End: After the video finishes playing, stop running and save the current configuration.

Images