[FFmpeg-user] encoding video from png diffs

[Joshua Grauman]

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 <jnfo at 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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