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@rhb
The mpeg4 codec output isn't liked by twitter so the 3min option would be good for almost anything but this purpose.
I think it is to do with something called yuv240p so I defo need more cpu oomph to make this work with the codecs that produce that (h264 and libx264, the latter better quality).
I'm probably missing lots. The ffmpeg guide is useful but depends on some lower level understanding I'm yet to develop.
Edit: testing making the video via mpeg4 then running ffmpeg again to convert with libx264 so in theory less simultaneous work for the zero. It is still quite slow it seems though, most of the effort is getting it into the twitter happy format.
(this thread is becoming my diary of this too, very public, much sorry).