[FFmpeg-user] encoding video from png diffs

[Joshua Grauman]

Yes, I know I don't *need* an alpha channel. But without one, you have to 
apply the same transparency to the whole frame, or use a green screen of 
some sort, both of which have negative affects...

Josh

>>>>> 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.
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