There is probably a way to do it directly with ffmpeg on the commandline,
but as I'm not an expert on that, I won't confuse you with guesses.
I have figured out how to generate raw video frames with a C++ program and
have ffmpeg convert it into a video. My ffmpeg command looks like this:
./shm | ffmpeg -f rawvideo -pixel_format bgra -video_size 1024x768 -framerate
30 -i - -vcodec huffyuv overlay.avi
The ./shm program is my C++ program. If you generate pngs from your mpeg
videos, you can read those in and generate the composit video. I use Qt a
lot, and it would make the commandline program easier (handles reading
pngs, compositing them, etc.).
Josh
Ah, thanks a lot for the suggestion, but I should have been clearer that I
need to do this in an automated fashion for arbitrary sets of videos so it
has to be command-line (or a library I guess) so that I can integrate it
into an automated pipeline in my app.
Thanks,
Alex
On Tue, Jan 10, 2017 at 3:37 AM Steve Boyer <steveboye...@gmail.com> wrote:
> Any suggestions on if either of these approaches is better, or any
> alternatives? Thanks!
>
Hi! I've done something similar to doing this, but I ended up using a
non-linear video editor. Specifically, I used kdenlive. It can do keyframe
animation, so combine that with fade-ins/fade from blacks (audio/video
filters) as well as fade-outs/fade to blacks, and you can do multiple
tracks combined into a single output video with animations/fades when a
stream ends. The downsides are that kdenlive, despite being the best video
editor on linux (IMHO), is a little buggy, is all CPU-based when it comes
to rendering and output file, for stability purposes it is recommended to
use a single thread, you will have to manually put things together and time
them, and need to use a GUI to do it all.
I'd be happy to help with suggestions if you go this route, but understand
if you want to go a different way (and I'd be interested if anyone has
other suggestions how this can be accomplished via FFmpeg or CLI tools).
Steve
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