#598: Subtitle on some BD/m2ts files are not handle.
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Reporter: Sebastiii | Owner: michael
Type: defect | Status: open
Priority: normal | Component: avformat
Version: git-master | Resolution:
Keywords: subtitle | Blocked By:
m2ts pmt bluray | Reproduced by developer: 1
Blocking: |
Analyzed by developer: 0 |
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Comment (by cehoyos):
I see three different problems with the BD stream you provided:
First, subtitle streams (0x120x) start late and are not detected by ffmpeg
-i. The same happens for the DVD stream. Since (subtitle) streams can
start at any point while playing back, but not every user wants a whole
file to be scanned when starting ffmpeg, I do not think there is an easy
solution. Note that the DVD stream plays as expected with mplayer -demuxer
lavf -sid 0 (and ffplay with "t").
At least ffmpeg -analyzeduration 2000000000 -i stream and ffplay stream
-sst 0 should work, both currently fail.
The second problem is that for the given BD sample, no streams are
detected by the MPEG-TS demuxer, all have to be auto-detected (note the
missing codec_tag information for the found streams in the output of
ffmpeg -i). Since mplayer -demuxer mpegts works fine (it does not support
auto-detection of video streams except MPEG-2), there seems to be a bug in
FFmpeg's demuxer (not a regression, afaict). If you cut the sample so the
subtitle streams start near the beginning of the file, subtitles are only
shown as "Data: [0][0][0][0] / 0x0000".
I worked around this problem with attached patch (autodetection of BD
subtitles), it works fine with mplayer -demuxer lavf -sid 0, but probably
has a significant performance impact (at the moment the stream starts).
The third problem is that the BD subtitles are only shown for one frame by
ffplay if you use the patch. I suspect this will not hit you when using
third party applications (it cannot be reproduced with MPlayer), but is
still noteworthy.
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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/598#comment:7>
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