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H264 Bitrate Limit

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Andrei Popa
H264 Bitrate Limit
on Sep 8, 2014 at 4:54:03 pm
Last Edited By Andrei Popa on Sep 8, 2014 at 4:55:57 pm

Hi there,

I have a 720P video that I have to encode in h264 with a bitrate of 12Mbps.

Is this possible?

The max I can get either in Media Encoder or Final Cut (quality settings maxed out) is 5Mbps in MOV format at 10Mbps in MP4 format.

If this is not the limit, how can i get a bitrate of 12Mbps with the H264 codec for a 720P video

Thanks


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Ryan Holmes
Re: H264 Bitrate Limit
on Sep 15, 2014 at 1:19:28 am

It depends on the "Level" you're using. Level 5, 5.1, and 5.2 are capable of h.264 mp4's with data rates of 135Mbps (5, 5.1) or 240Mbps (5.2).

You'll just need to up the "Level." It's a drop down menu in Adobe Media Encoder (CS5.5 and later I believe).

http://en.wikipedia.org/wiki/H.264/MPEG-4_AVC#Levels

Ryan Holmes
http://www.ryanholmes.me
@CutColorPost


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Andrei Popa
Re: H264 Bitrate Limit
on Sep 16, 2014 at 6:37:39 pm

Hi Ryan,

I did find that out.

For some reason though there is something very weird going on on my computer.

No matter if I use Adobe Media Encoder or Compressor, and I select these high bitrate settings, my computer ignores them and makes a file that is usually 3 to 5mbps...


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Ryan Holmes
Re: H264 Bitrate Limit
on Sep 16, 2014 at 6:52:50 pm

[Andrei Popa] "No matter if I use Adobe Media Encoder or Compressor, and I select these high bitrate settings, my computer ignores them and makes a file that is usually 3 to 5mbps..."

Are you using current versions of Media Encoder or Compressor? Are you using a VBR instead of a CBR?

VBR = variable bit rate, so the software will use only the data rate it needs to create the picture. Typically this mode will have a "Maximum" setting and a "Target" setting, with target being where the software tries to peg the data rate at but it could go up to the maximum or down below the target if the extra bits are necessary
CBR = constant bit rate, so the software will use all of the available data regardless of whether it needs to or not to define the picture

Ryan Holmes
http://www.ryanholmes.me
@CutColorPost


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Andrei Popa
Re: H264 Bitrate Limit
on Sep 16, 2014 at 6:56:07 pm

I'm using CBR and CS5 and Compressor 4

So CS5 is quite old, but Compressor current


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