Created a feature request to support columnboxing input that changes aspect-ratio mid-stream.
https://trac.ffmpeg.org/ticket/4065 On 29 October 2014 13:49, Mika Raento <mi...@iki.fi> wrote: > Tickets for sub2video and async not working with non-monotonic input, > using -copyts: > > https://trac.ffmpeg.org/ticket/4062 > https://trac.ffmpeg.org/ticket/4064 > > Hm. Lots of my issues seem to relate to using -copyts. I had trouble > keeping all video and all audio if there were periods where one or the > other were missing (esp. in the beginning). Maybe I could make this simpler > if I'd relax that requirement (I don't know how much happier my users are > if they get audio but no video, rather than nothing). > > Mika > > On 29 October 2014 10:38, Mika Raento <mi...@iki.fi> wrote: > >> 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
