[FFmpeg-trac] #9185(avformat:new): ffmpeg flac decoder incorrectly finds junk frame
FFmpeg
trac at avcodec.org
Wed Apr 14 10:37:01 EEST 2021
#9185: ffmpeg flac decoder incorrectly finds junk frame
------------------------------------+------------------------------------
Reporter: wader | Owner:
Type: defect | Status: new
Priority: normal | Component: avformat
Version: git-master | Resolution:
Keywords: flac | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by wader):
Sorry, i should have made a better example file. Your right this one
produced the exact same output as flac reference decoder. The new one is
the same with some audio concatenated to it.
{{{
$ ffmpeg -i flac_junk_frame_issue2.flac
flac_junk_frame_issue2.flac.ffmpeg.wav
...
$ flac -d -o flac_junk_frame_issue2.flac.ref.wav
flac_junk_frame_issue2.flac
...
$ ffmpeg -i flac_junk_frame_issue2.flac.ffmpeg.wav -f s16le -ac 2
flac_junk_frame_issue2.flac.ffmpeg.wav.pcm
...
$ ffmpeg -i flac_junk_frame_issue2.flac.ref.wav -f s16le -ac 2
flac_junk_frame_issue2.flac.ref.wav.pcm
...
$ md5 *.pcm
MD5 (flac_junk_frame_issue2.flac.ffmpeg.wav.pcm) =
a9ab411b9ab575be67693c03b56d621b
MD5 (flac_junk_frame_issue2.flac.ref.wav.pcm) =
901bdda002f27d63254d077d20985595
}}}
It looks like one silent flac frame (4096 samples) is missing.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/9185#comment:2>
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