[FFmpeg-user] buffer underflow - processing VOB files

[Bob DeCarlo]

All,
I sent out a google drive link. Let me know if this is OK.

phasebtop1ntscdvd.VOB is a sample file created using a recent FFMPEG version from a video capture device.  The text file shows the text output of that recording.  This file reproduces the underflow issue as previously described.  Maybe there is problem is here?  

I also included VTS_01_1.VOB which was recorded by a Panasonic DVD recorder.  I see that the issue is NOT reproduced using this as input file.  - new information - Does this help?  

In summary:
build from: e5819fa62930966e6fb905cef21c985b91631d87
and test:
./ffmpeg -i ~/Videos/phasebtop1ntscdvd.VOB -ss 50 -target ntsc-dvd -flags +cgop+ilme+ildct -alternate_scan 1 -top 1 -g 15 -sc_threshold 1000000000 -y out.VOB -v debug
The result seems good.
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build from: ae9297097696f3d06417a6e8a5368d5f38a6edb4 
and test:
./ffmpeg -i ~/Videos/phasebtop1ntscdvd.VOB -ss 50 -target ntsc-dvd -flags +cgop+ilme+ildct -alternate_scan 1 -top 1 -g 15 -sc_threshold 1000000000 -y out.VOB -v debug
The result core dumps.
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Apply p.patch, rebuild, and retest.  The result is underflow which is the issue I am reporting.
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Note: FFMPEG has been a useful tool for splicing, lowering bitrate, etc,,, and repairing video files.  That is why this came up as an issue.

Whatever you need me to do next, please ask...
Thanks!
Bob

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