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Mb/s in Prores 422hq

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Ofer Geva
Mb/s in Prores 422hq
on Feb 21, 2013 at 11:25:04 pm

what is the bit rate in Prores 422 HQ in 24p?

And also- are all recorders that recored a Prores 422 HQ encoded file record the same bit rate?


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Shane Ross
Re: Mb/s in Prores 422hq
on Feb 21, 2013 at 11:41:15 pm

[Ofer Geva] "what is the bit rate in Prores 422 HQ in 24p?"

1080p 23.98 is 24.7 MB/s

[Ofer Geva] "And also- are all recorders that recored a Prores 422 HQ encoded file record the same bit rate?"

Yes.

Shane
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Andrew Kimery
Re: Mb/s in Prores 422hq
on Feb 21, 2013 at 11:59:33 pm

AJA's utility shows 1080p24 ProRes HQ to be 24.7 MB/s where as Apple's white paper gives a target bit rate of 175Mb/s aka 22 MB/s. These equate to 89gigs/per and 79gigs/per respectively (for just video, no audio). ProRes is a variable bit rate codec so there can be small fluctuations in file size between clips of the same duration.




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Rafael Amador
Re: Mb/s in Prores 422hq
on Feb 22, 2013 at 2:50:36 am

[Ofer Geva] " all recorders that recored a Prores 422 HQ encoded file record the same bit rate?"
No.
Beside the fact that is a VBR codec, it will depend of the hardware you use for the compression.
codecs are sets of rules/recommendations for compression/decompression and they can be implemented with certain variations by different chips, so you may get some differences when using hardware from different manufacturers.
rafael


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