Video decoder detects wrong pixel aspect ratio
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Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 20/100
- Issue type
- Bug
- Clarity
- Needs clarification
- Activity status
- Stale
- Domain
- audio-video-rtc, embedded-iot
Research direction
Start by examining the uploaded aspect.mkv sample and comparing the ffmpeg stream metadata with omxplayer's reported 64/27 pixel aspect ratio. Trace the Raspberry Pi video decoder path responsible for the PortSettingsChanged output; done would require identifying the cause and defining a verified correction or explanation.
Written by the indexing model from the issue text.
Description
I have some SD-MPEG2 streams with 16.9 aspect ratio. VLC plays them fine and ffmpeg reports correct dimensions:
Stream #0:0(eng): Video: mpeg2video (Main), yuv420p(tv), 720x576 [SAR 64:45 DAR 16:9], max. 8500 kb/s, 25 fps, 25 tbr, 1k tbn, 50 tbc (default)
However, omxplayer detects a curious pixel aspect ratio of 64/27 and thus shrinks the video vertically:
V:PortSettingsChanged: 720x576@25.00 interlace:3 deinterlace:1 anaglyph:0 par:2.37 layer:0 alpha:255
Do you have an explanation for this? I've uploaded a sample here: www.reufer.ch/temp/aspect.mkv
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