[Cin] background render tip

[Phyllis Smith]

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 Wed, Jul 28, 2021 at 7:16 AM Andrew Randrianasulu via Cin <
cin at lists.cinelerra-gg.org> wrote:

>
>
> On Wednesday, July 28, 2021, Andrew Randrianasulu <randrianasulu at 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..)
>>
> --
> Cin mailing list
> Cin at lists.cinelerra-gg.org
> https://lists.cinelerra-gg.org/mailman/listinfo/cin
>
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