[FFmpeg-user] Faster codec with alpha

[Paul B Mahol]

On 12/2/16, Joshua Grauman <jnfo at grauman.com> wrote:
> Hello all,
>
> I am using the following command successfully to generate a screencast.
> The video comes from my program 'gen-vid' which outputs the raw frames
> with alpha channel. The resulting .avi has alpha channel as well which is
> my goal. It all works great except that my computer can't handle doing it
> real-time. So I am wondering if there is a different vcodec I could use to
> achieve the same result that was less demaning on the cpu? I am willing to
> sacrifice some compression for more speed, but would prefer not to have to
> store all the raw frames without any compression. Storing the alpha
> channel is also a must. It is preferable if the compression is lossless.
> Does anyone have any other suggestions for compression other than png that
> may be faster? Thanks!

utvideo, huffyuv, ffvhuff

>
> ./gen-vid | ffmpeg -f rawvideo -pixel_format bgra -video_size 1920x1080
> -framerate 30 -i - -vcodec png over.avi
>
> Josh
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