FORUMS: list search recent posts

Scrubbing H264

COW Forums : Compression Techniques

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
jason mika
Scrubbing H264
on Apr 2, 2008 at 3:37:54 pm

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.


Return to posts index

Daniel Low
Re: Scrubbing H264
on Apr 3, 2008 at 9:16:41 am

See section 6c

http://www.apple.com/quicktime/tutorials/h264.html

The bottom line is that in order to make an I-frame only 1920x1080 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.


__________________________________________________________________
Please post back saying what solved your problem. It could help others, and saying 'thanks' is free!


Return to posts index

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
© 2017 CreativeCOW.net All Rights Reserved
[TOP]