Encrypted Video Bit Rate Identification via Audio Fragment Analysis
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Solution Overview
Problem
Current methods cannot accurately identify the bit rate of encrypted video services, which is crucial for assessing user experience in video services, as existing technologies are limited to non-encrypted video services.
Innovation Solution
A method and apparatus that identify the bit rate of encrypted video services by separating audio and video fragments from a data stream, calculating their playback duration using a pre-obtained audio bit rate, and determining the video bit rate without decrypting the fragments, applicable to various network elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encrypted video services are used to protect user data and security, then security and confidentiality are improved, but the ability to identify bit rate is lost
Solution Approach 1:
The patent introduces an audio fragment as an intermediary element to indirectly measure video bit rate. By separating the audio fragment from the encrypted video data stream and using its known bit rate to calculate playback duration, the system can then determine video bit rate through ratio calculation without needing to decrypt the video content. This intermediary approach resolves the contradiction by enabling measurement while maintaining encryption.
Solution Approach 2:
The patent replaces the traditional mechanical approach of decrypting video data to measure bit rate with a mathematical calculation system. Instead of breaking encryption to access video data, the system uses audio fragment characteristics (size and known bit rate) to calculate playback duration, then uses this duration alongside video fragment size to derive video bit rate through mathematical relationships. This substitution eliminates the need to compromise encryption while achieving accurate measurement.
2Measurement precision
If traditional bit rate identification methods are applied to encrypted video services, then measurement capability is improved, but decryption complexity and computational overhead increase
Solution Approach 1:
The patent extracts the audio fragment from the encrypted video data stream and processes it separately. By taking out the audio component, which has a known and fixed bit rate, the system can perform calculations on this extracted element without needing to decrypt the main video content. This extraction principle significantly reduces device complexity by avoiding the computationally intensive decryption process while still enabling accurate bit rate identification through the audio-video relationship.
3Measurement precision
If audio and video fragments are separated and processed independently, then bit rate identification accuracy is improved, but processing time and computational resources increase
Solution Approach 1:
The patent performs preliminary action by first separating and identifying the audio fragment, then using its known characteristics (size and fixed bit rate) to pre-calculate the playback duration before processing the video fragment. This preliminary calculation of audio playback duration provides a ready reference that simplifies the subsequent video bit rate calculation. By doing this preparation work first, the system avoids redundant computations and reduces overall processing time while maintaining high measurement precision.
Data Source
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AI summary
Embodiments of the present invention disclose a video bit rate identification method and apparatus. The method may include: identifying an audio fragment and a video fragment from a data stream of a video service, and recording a size of the audio fragment and a size of the video fragment; calculating playback duration of the audio fragment by using a pre-obtained audio bit rate and the size of the audio fragment; and using the playback duration of the audio fragment as playback duration of the video fragment, and calculating a bit rate of the video fragment by using the size and the playback duration of the video fragment. According to the embodiments of the present invention, a bit rate of an encrypted video service can be identified.