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Scrubbing H264
Greetings,
I’m working on a project making 1080p motion graphics loops for a media server.
The final delivery format is h264 and the client wants all of
the clips to be scrubbable.
Ive been using a variety of h264 front ends like
mpeg streamclip, compressor, episode, quicktime, x264 etc…
The only way I know to make H264 scrubbable it to set keyframes on every frame.
However the result is absolutely ghastly!
My best results have been using quicktime multipass export using x264with a datarate cap around 9Mbits/s with natural keyframes.I’m trying to get an acceptable looking mov around 7Mbits/s
as specified.If someone could illuminate me as to why when the key frames are set to all, the result is absolutely unacceptable. I would really appreciate it.
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1 Reply
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See section 6c
https://www.apple.com/quicktime/tutorials/h264.html
The bottom line is that in order to make an I-frame only 1920×1080 h.264 clip look good, you’ll need a datarate of something in the order of 250Mbit/s. At that point scrubbing will probably melt your hard drives.
To scrub a long-GOP 1080p H.264 clip you’ll need the fastest CPU and or GPU you can get your hands on, even then it’s unlikely to to be totally fluid.
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Please post back saying what solved your problem. It could help others, and saying ‘thanks’ is free!
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