I'm not really sure why, but I got it to work with the following cmd...
Thanks for your patience!
./shm | ffmpeg -f rawvideo -pixel_format bgr32 -video_size 1274x541 -framerate
30 -i - out.mp4
On Sat, 3 Sep 2016, Joshua Grauman wrote:
Sorry for another question, but I'm having a hard time figuring out why this
doesn't work. I've written a program to output raw image data (32-bit rgba),
frame after frame. I'm trying a test to encode it to mp4, but this command
says:
./shm | ffmpeg -f image2 -r 30 -s 1274x541 -pix_fmt rgb32 -vcodec rawvideo -i
- out.mp4
Could find no file with path 'pipe:' and index in the range 0-4
pipe:: No such file or directory
What am I doing wrong?
Thanks!
Josh
On Fri, 2 Sep 2016, Joshua Grauman wrote:
I've been looking for a way to screencast an app with alpha, but I haven't
found one yet (but if someone knows of one, I'd love it). So I'm working
on modifying my app to generate png's at 30 frames per second.
Josh
> 2016-09-02 7:29 GMT+02:00 Joshua Grauman <j...@grauman.com>:
> > I have another different, but related question. What format would you
> > suggest for storing my screencast in? The resulting video is going to
> > be
> > 1080p30 and it needs to have an alpha channel
>
> Which screencast technology allows to record an alpha channel?
> mpng should be best for screencasts, some people like utvideo.
>
> Carl Eugen
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