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Impact of Packet Loss Rate on Quality of Compressed High Resolution Videos
Juraj Bienik1, Miroslav Uhrina1, Lukas Sevcik1
1University of Zilina, Univerzitna 1, 010 26 Zilina, Slovakia.
Sensors (Basel, Switzerland)
|March 11, 2023
Summary
Video quality degrades with increased packet loss, impacting real-time streaming. Higher bit rates worsen quality loss, regardless of compression, necessitating parameter tuning for network conditions.
Area of Science:
- Multimedia communication engineering
- Digital video transmission
Background:
- Real-time video over IP networks (e.g., videotelephony, live-streaming) using RTP over UDP is susceptible to quality degradation.
- Video compression and transmission over unreliable channels are primary sources of this degradation.
Purpose of the Study:
- To analyze the impact of packet loss rate (PLR) on video quality.
- To evaluate video quality across different compression parameters, resolutions, and bit rates under simulated packet loss.
Main Methods:
- A dataset of 11,200 Full HD and Ultra HD video sequences encoded with H.264 and H.265 at five bit rates was created.
- Simulated packet loss rates from 0% to 1% were applied.
- Objective quality assessment used Peak Signal to Noise Ratio (PSNR) and Structural Similarity Index (SSIM).
- Subjective evaluation employed the Absolute Category Rating (ACR) method.
Main Results:
- Video quality consistently decreased as the packet loss rate increased, irrespective of compression settings.
- Contrary to expectations, video quality degraded further with higher bit rates when packet loss occurred.
- Compression parameters and resolution influenced the extent of quality degradation.
Conclusions:
- Packet loss significantly degrades real-time video quality over IP networks.
- Recommendations for optimal compression parameter selection are provided for varying network conditions to mitigate quality loss.
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