Great tip. I have added this gem to the manual at the end of the Background Rendering section as seen below.
Except $ cat ~/tmp/brender* | ffmpeg -f image2pipe -i - -c:v copy brender.mov did not work for me.
Tip: If you have rendered your whole project with File format set to JPEG and
there are no missing numbers in the sequence, you can create a video from that
sequence outside of CINELERRA-GG. For example, if using the default output so
that your files are named /tmp/brender000000, /tmp/brender000001, ... in a
window, you would type:
ffmpeg -f image2 -i /tmp/brender0%5d -c:v copy brender.mov
which would create the video file brender.mov - be sure to delete existing brender
files before creating a new sequence to ensure there are no missing numerical
values in the sequence.
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.
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..)
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