[FFmpeg-user] Faster codec with alpha

[Joshua Grauman]

Thanks guys, I'll look into these ideas!

Josh

On Fri, 2 Dec 2016, Paul B Mahol wrote:

> 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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