[FFmpeg-trac] #2877(undetermined:new): Unable to rewind/seek a mp3

[FFmpeg]

#2877: Unable to rewind/seek a mp3
-------------------------------------+-------------------------------------
             Reporter:  jpo38        |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:  seek         |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------

Comment (by saste):

 Replying to [comment:10 jpo38]:
 > Thank you for investigating this problem.
 >
 > When I read my mp3 files, AVFormatContext::start_time is 0, so I suspect
 my file starts with timestamp 0, right?
 >
 > I replaced
 > av_seek_frame( container, audio_stream, 0, AVSEEK_FLAG_FRAME );
 > by
 > avformat_seek_file( container, audio_stream, INT64_MIN,
 container->start_time, INT64_MAX, 0 )
 >
 > No change. I can still see the bug.
 >
 > I ran {{{ffprobe IN.mp3 -read_intervals "%2,0%2" -of compact
 -show_packets}}}
 >
 > Here is the output (truncated):
 [...]
 > Looks like you read the file twice and you're getting the same number of
 data. It works the same for me, only the data I read (when converted to
 float/double) are not the same....
 > Did you try to compile my sample? It's very straightforward. It reads
 the file once, rewinds and reads again. It then compares data. We read the
 same number of samples but not the same values...

 It doesn't explain the issue, but you could try to flush the data in the
 decoder before re-using it in the second loop, since it is the only object
 which is reused between the two sessions. Also, with which formats does it
 happen, how much is the data different, how many samples differ?

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2877#comment:11>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker