Video Playback Speed Control via Non-Key Frame Compression
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Solution Overview
Problem
Existing methods for playing back high-quality videos, such as 4K videos, at multiple speeds suffer from playback lag due to long decoding times.
Innovation Solution
The method involves obtaining video data that includes key frames and non-key frames, compressing the non-key frames to generate second video data with a lower frame rate, and then decoding and playing back the second video data at a multiple-speed, reducing the decoding pressure and avoiding lag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If all video frames are decoded frame by frame to achieve multiple-speed playback, then playback speed can be adjusted, but decoding time becomes excessively long causing playback lag
Solution Approach 1:
The patent extracts and removes non-key frames from the video data before decoding. By identifying key frames (intra-coded frames) and eliminating non-key frames (inter-coded frames that depend on key frames), the system reduces the amount of data requiring decoding while maintaining playable video content, thereby reducing decoding time and avoiding playback lag.
Solution Approach 2:
The patent performs frame compression and selection before the decoding process. By pre-processing the video data to remove unnecessary non-key frames and compressing the remaining key frames, the system prepares a reduced dataset that requires less decoding time, thus solving the playback lag problem caused by long decoding times.
2Reliability
If all video frames including non-key frames are decoded, then complete video quality is maintained, but decoding pressure on the device increases
Solution Approach 1:
The patent extracts only the essential key frames from the video stream, removing redundant non-key frames. This extraction process maintains the core video quality and structural integrity while significantly reducing the data volume that requires decoding, thereby lowering the decoding pressure on the terminal device.
Solution Approach 2:
The patent changes the frame rate parameter by removing non-key frames, effectively reducing the number of frames per second that need to be decoded. This parameter change maintains acceptable video quality for playback purposes while substantially reducing the computational burden on the device.
3Productivity
If non-key frames are compressed and removed before decoding, then decoding pressure is reduced, but video data completeness is affected
Solution Approach 1:
The patent selectively extracts only key frames (intra-coded frames that are self-contained) from the video stream, removing non-key frames (inter-coded frames that reference other frames). This extraction maintains video data completeness for playback purposes because key frames contain all necessary information to reconstruct the video sequence, while significantly improving decoding efficiency.
Solution Approach 2:
The patent creates a simplified copy of the video data consisting only of key frames. This copied version retains the essential visual information and temporal structure needed for multiple-speed playback, while being much more efficient to decode. The copying process preserves the critical video content without requiring the full original data set.
Data Source
AI summary
Embodiments of the present disclosure provide a method and an apparatus for playing back a video at a multiple-speed, an electronic device and a storage medium; where the method includes: obtaining first video data, where the first video data includes key frames and non-key frames; compressing the non-key frames of the first video data to generate second video data; and decoding the second video data to obtain decoded video data, and playing back the decoded video data at a multiple-speed according to a preset playback multiple-speed value. Since before decoding and playing back the first video data, the non-key frames of the first video data are compressed, and the compressed second video data is played at a multiple-speed, so as to reduce the decoding pressure for a device, avoid a lag when playing back the video at a multiple-speed and improve the smoothness of video playback at a multiple-speed.