The only way to guarantee really good results with H264 and rapid changes I guess is to set the Keyframes to 1 so basically you just get a stream of I-Frames (as in fully encoded stills). Basically an Intra file, a file with a GOP of 1 (group-of-pictures). Wherever you host it though is going to reencode it with a longer GOP, but vimeo will at least allow you to make the original file downloadable. The file will have to be very large though compared to a normal H264 encoded file, as you'll need to set a high bitrate to make sure you're not starving the I-Frames. For example the AVC-Intra flavour of H264 has a fixed bitrate (CBR) of 100Mbps. When I set my camera up to shoot in an Intra format I have it running between 120-140Mbps as I don't have the luxury of 2 pass encoding etc.
However a good H264 encoder should cope with what your film contains. The mainconcept encoder for example (which is very tweakable) would use scene change detection to automatically start a new GOP where the frame changes dramatically. What would happen to it on vimeo when it rencodes it to stream though is out of your control. Also, you could try giving vimeo a file with a much higher bitrate (say 30-40Mbps or so), it'll encode it down to a lower bitrate but at least it has a better start point. It may also simply be that the encoder you're using is doing a poor job of scene detection/rapid change within such a low bitrate (as the Vimeo recommendations), and when vimeo encodes it the problem gets compounded, so reencoding with a higher bitrate may solve the problem. On Mon, Sep 17, 2012 at 2:08 AM, ev petrol <[email protected]> wrote: > hey folks > has anyone found a good way to compress a film with a lot of single frames > for the web? > had a go here, followed the specific vimeo compression suggestions: > vimeo.com/moiratierney/are-we-there-yet > but the result is pretty bad (the single frame stuff comes in at 5:15) > cheers moira > > moiratierney.net > vimeo.com/moiratierney > > _______________________________________________ > FrameWorks mailing list > [email protected] > https://mailman-mail5.webfaction.com/listinfo/frameworks > >
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