On Wednesday, July 28, 2021, Andrew Randrianasulu <randrianasulu@gmail.com> wrote:

While working on EDL support I noticed old Adobe Premiere (4.0, 4.2) had interesting mode where you can output .mov from pre-rendered (with effects, transitions, etc) workarea. In CinelerraGG you can get similar effect by setting background render to jpeg, making sure your whole project got its preview (red bar) rendered, then quit cin and execute something like this:

$ ffmpeg -f image2 -i ~/tmp/000%3d -c:v copy brender.mov

actually, for non-0 started sequence I found this line works better (set brender file to your_path/brender, it will be numbered automatically)

rm ~/tmp/brender* before each use

{ do your stuff in cin }

$ cat ~/tmp/brender* | ffmpeg -f image2pipe -i - -c:v copy brender.mov

at least with ffmpeg 4.4 it will refuse to update your existing brender.mov file unlike image2 demuxer... so delete it if not needed or set different output filename.

from https://superuser.com/questions/624567/how-to-create-a-video-from-images-using-ffmpeg

it will copy your background render jpegs into mov without re-encoding them

you might want to add '-r' too for specific framerate.

I wonder if libavformat-based mov muxer can be re-introduced for such task .. (not feature request, just thinking). And may be 'delete brender files' button (there seems to be some space in preferences/performance GUI window..)