[FFmpeg-user] encoding video from png diffs

[Carles Vila]

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> 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 (the input png's will use the
> alpha channel). The screencast is going to be overlaid at a later time
> (with ffmpeg) onto another 1080p30 avchd video from my canon camera.
>

In order to overlay one video on top of another you don't need anything
related to an alpha channel.