I gathered as much, and indeed that is happening in libavformat/utils.c (seek_frame_internal with AVFMT_NOGENSEARCH in my case). But the mp3 parser keeps leading data even if freshly created. I was wondering why, maybe some codecs need it. Anyway, my question remains: What is a format supposed to do?
Cheers, Karsten > Am 18.06.2018 um 00:58 schrieb Ronald S. Bultje <rsbul...@gmail.com>: > > Hi Karsten, > > I believe that the parsers are seek-unaware, so you're expected to delete > and recreate (or reinit) the parsers after each seek. > > Ronald > > On Sun, Jun 17, 2018 at 10:56 AM, Karsten Otto <ott...@posteo.de> wrote: > >> Hi list, >> >> I have a question about mpegaudio_parser. I see that it keeps any packet >> data before a frame header, instead of discarding it. This makes sense, >> because it usually can combine this data with the leftovers from a previous >> packet to complete a frame. But the parser also does this when just >> starting up, i.e. after a seek. I had expected it to discard the preceding >> data in this case. So, is this expected behaviour? Am I using it wrong? >> >> Background: I am trying to add seek capability to libavformat/aadec. >> Unfortunately, when the format contains MP3 content, its frames do *not* >> align with the internal crypto chunk boundaries. So when seeking to a valid >> chunk start, it usually lands in the middle of an MP3 frame. Given the >> behaviour of the mpegaudio_parser, there is always some audible glitch. I >> can work around this by adding my own MP3 header detection, but that would >> not be very DRY. So, what is the proper way of handling this case? Any >> suggestions? >> >> Thanks, >> Karsten >> _______________________________________________ >> ffmpeg-devel mailing list >> ffmpeg-devel@ffmpeg.org >> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel >> > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel