That sounds great, Kieran! The plan with AJA is to leverage the open source ntv2_v4l2 (AJA video for linux driver) to capture audio, video, and timecode over SDI to a standard video for linux virtual device (aka /dev/video0). Then use the ffmpeg support for v4l2 to read it in and again set the TC string on the video stream metadata. I am just getting started after hearing confirmation from the AJA dev that he would add TC support to the ntv2_v4l2. In general video for linux could work as a consistent interface for this when capturing.
Sincerely, Jon > On May 25, 2018, at 10:47 AM, Kieran O Leary <kieran.o.le...@gmail.com> wrote: > > Hi Jonathan, > > On Fri, May 25, 2018 at 6:32 PM, Jonathan Morley <jmor...@pixsystem.com> > wrote: >> Hi Kieran, >> >> To answer your question, this change basically takes the first valid TC as a >> string and sticks it in the video’s avstream metadata dictionary where other >> muxers and encoders look. It does not make an independent timecode >> track/stream with samples per frame. That is why I called the patch >> “limited”. However there doesn’t seem to be many if any parts of ffmpeg that >> use dedicated timecode streams with individual samples. That is why it still >> seemed worth submitting my work back as we move on to other solutions. > > It sounds great to me! I think that this type of timecode (just > storing first value as a string string) is all I've ever really seen > in the real world(I work in the Irish Film Archive and we have several > thousand video tapes as well). This is how AJA Control Room and > Blackmagic Media Express work anyhow. I'm hoping that this will allow > open source archival capture tools like > https://github.com/amiaopensource/vrecord to be able to capture > timecode. > > I look forward to trying it out, as our goal is to be able to use > vrecord in order to capture tape to FFV1/Matroska. Matroska doesn't > support data tracks (yet), but ffmpeg does store the starting timecode > string as a Matroska Tag when it detects a timecode track in a source > video. I would love if capturing to Matroska from tape could store > that starting timecode value, but it's a completely seperate issue to > this patch. > >> >> I hope that still helps you in your case. I will stay the course to address >> Marton’s feedback and get this in there. > > yeah it's great, I'm also interested in your AJA work as we also have > AJA hardware, though as there's no open SDK for AJA, I'm not sure how > this would integrate into FFmpeg. > > Best, > > Kieran. > _______________________________________________ > 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
