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Black bar detection not updating tag correctly

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mattkhan:
I sent you a sample

Hendrik:
If I do your seek command but output the frames to a file



You might see the problem. We already ignore the first 4 frames at the start, I might increase that to 8 or 10 just to be safe. Although technically seeking could result in even worse results / longer gaps, and LAV for example has a bunch of helpers to avoid outputting those, but re-creating all that in the analysis would be rather overkill (and some particularly bad files still slip by). FFmpeg itself is supposed to only output recovered frames, but seemingly this is not working properly for all videos.

For Blu-rays, I should really read the seeking table in the Blu-ray metadata, rather then blindly seeking in the m2ts, but its quite a lot of effort to do this all manually, so maybe this might come when I have a Blu-ray demuxer for Linux that I can just re-use .. sometime.

You can simulate the fix by using "-vf cropdetect=skip=8"

mattkhan:
OK i see

if MC samples the track at intervals, how long a section does it analyse?

any downside to skipping a few more frames?

 

Hendrik:
Shouldn't be a problem. Lets see how it behaves in the next build.

mattkhan:
Ok great.

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