segment muxer PIDs were fixed in https://github.com/FFmpeg/FFmpeg/commit/502fc3b3d4b36015562d19d74f27d0a4ff835c4e by me
On 29 October 2014 10:17, Mika Raento <mi...@iki.fi> wrote: > Hi > > Thanks for the feedback. > > I'll try to capture at least some of these in tickets, and reply on this > thread as I go along. > > Async not working with damaged audio input is > https://trac.ffmpeg.org/ticket/2693 (existing ticket) > > Sub2video not working with negative timestamps is > https://trac.ffmpeg.org/ticket/4062 (new ticket) > > Mika > > On 27 October 2014 01:00, Michael Niedermayer <michae...@gmx.at> wrote: > >> On Wed, Sep 24, 2014 at 10:43:40AM +0300, Mika Raento wrote: >> > Dear all >> > >> > This mail is meant mainly as a note to other potential users, but >> > possibly as input to development - time allowing I might be able to pick >> > up some of the pieces myself. It's also a thank-you for all the hard >> > work in ffmpeg. >> > >> > I've successfully implemented a transcoding pipeline for producing >> > multi-bitrate fragmented mp4 files from broadcast DVB input. More >> > concretely, I'm taking in broadcast TS captures with either mpeg2 video >> > and mp2 audio (SD, varying aspect ratio) or h264 video and aac audio, >> > both potentially with dvbsub. From that I'm producing ISMV output with >> > multiple bitrate h264 video at fixed 16:9 aspect ratio and multiple >> > bitrate aac audio, with burned subtitles. The ISMV outputs are >> > post-processed with tools/ismindex and with the hls muxer. >> > >> > There are number of limitations in ffmpeg that I've had to work around: >> > >> > - I haven't gotten sub2video or async working without reasonably >> > monotonous DTS. Broadcast TS streams can easily contain backward jumps >> > in time (e.g., a cheapo source that plays mp4 files and starts each >> file >> > at 0). The fix is to cut the TS into pieces at timestamp jump >> locations >> > and using '-itsoffset' to rewrite the timestamps and then concatenate. >> > I'm using the segment and concat muxers for that. >> > - Sub2video doesn't work with negative timestamps, so I use '-itsoffset' >> > to get positive timestamps >> > - For HD streams, I need to scale up the sub2video results from SD to >> > HD. Sub2video doesn't handle the HD subtitle geometries. I'm not >> > enough of an expert to know whether that's the issue, or whether >> that's >> > just the way it's supposed to work with SD subs (typical) with HD >> video. >> > - For columnboxing, I use the scale, pad and setdar video filters. These >> > work fine, but their parameters are only evaluated at start, so I need >> > to cut the video into pieces with a single aspect ratio first and >> > concatenate later. >> > - Audio sync (using aresample) gets confused if the input contains >> > errors, so I need to first re-encode audio (with '-copyts') and only >> > after that synchronize. >> > - The TS PIDs are not kept over the segment muxer, so I given them on >> > the command line with '-streamid'. >> >> a bit late reply but >> bug reports or feature requests for all these are welcome unless there >> are already tickets for them assuming these issues still exist >> >> thx >> >> [...] >> >> -- >> Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB >> >> Why not whip the teacher when the pupil misbehaves? -- Diogenes of Sinope >> >> _______________________________________________ >> 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
