Compression Techniques Forum
SD ProRes
SD ProRes
by Patrick de Teliga on Aug 26, 2014 at 5:11:57 am


I have recently edited and animated a music vid and have exported out the final files. One for web (YouTube etc) and one for HD Broadcast (1920 x 1080 ProRes).

I have been requested to supply a file to the below specs
CODEC/CONTAINER: Apple ProRes 422/.mov
RESOLUTION: 1024x576 (for standard-definition material only)
AUDIO: Stereo/48khz/24-bit.
File size between 700MB - 1GB.

I cut it in Pr Pro CC and have exported it in the program itself and thru AME and I cannot get the file within the 700MB - 1GB range. I have also used Mpeg Stream Clip, Compressor 4 (just bought it before thinking that there would be more control over the data rate in the compression - not the case!) and I still cannot get the file under 1.48GB

Any advice cow community?

Any help would be great thanks

Re: SD ProRes
by Ivan Myles on Aug 26, 2014 at 12:50:41 pm

Two things to verify:
- 1024x576 square pixels; ProRes SD-PAL standard is 720x576 with rectangular pixels
- ProRes 422 codec vs LT vs Proxy

How long is the video?

Re: SD ProRes
by Patrick de Teliga on Aug 26, 2014 at 10:03:31 pm

Length is 3.46min and I'm using the straight 422 codec.

And yes, I've been going with square pixels - as per the request sent.

Thanks for your help!

Re: SD ProRes
by Ivan Myles on Aug 27, 2014 at 1:52:54 pm

ProRes bitrate is built into the codec. Here are your options:

- use ProRes 422 and submit a 1.48GB file
- use a lower bitrate codec to meet the file size requirement
- use ProRes 422 and cut the length of the video to reduce file size

The bitrate for ProRes 422 at 720x576-25p is listed as 41 Mbps, and it looks like your 1024x576-25p file was encoded at about 44 Mbps. If you use ProRes 422 LT with a bitrate around 28-30 Mbps the encoded file should be about 850-900MB. So then the client can decide whether they want ProRes 422 at 1.48GB or a ProRes 422 LT file that meets the size requirement.

Do a web search on "prores white paper" for more information regarding ProRes bitrates.

Re: SD ProRes
by Patrick de Teliga on Aug 27, 2014 at 10:10:43 pm

Thanks for the help Ivan.

I pushed one out in ProRes LT and have sent them that - it came in at 996.7MB - I figured that would be the best option for them. If they ask for full ProRes, I'll just send them the larger file.

Thanks again for the help mate!