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QuickTime
Hi, a quick technical question that searching on here for previous posts hasn’t found a conclusive answer too.
If I encode a video using QuickTime Pro with the built in H.264 codec using quality = 100% (best) with multipass, what colour sampling will it use?
Is it going to be 4:4:4, 4:2:2 or 4:2:0 or something else?
Thanks in advance,
James -
3 Replies
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4:2:0.
Apple sees H.264 as a delivery codec (quite rightly) and as such 4:2:0 is perfectly suitable.
Apple has ProRes 4:2:2 & 4:4:4 for a ‘work’ codec
https://en.wikipedia.org/wiki/H.264/MPEG-4_AVC
https://images.apple.com/quicktime/pdf/H264_Technology_Brief.pdf
https://images.apple.com/finalcutstudio/docs/Apple_ProRes_White_Paper_July_2009.pdfObviously you’d only want to work with the colour subsample of the source you have, no point in going from 4:2:2 to 4:4:4 unless you love compositing.
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Thanks for the info Daniel.
I did wonder, so far I have been quite impressed with H.264 from QuickTime and seems like a good option for sending files to clients who have file size limits etc.
I have done a test encode on a video here, that has a lot of vibrant colour, and comparing an encode (using QuickTime) at Photo-JEPG @95% and H.264 at 100%, there is no obvious difference, except for file size (for a c20s clip the H.264 is about 160MB smaller). The original colour has been retained well to my eyes with this non scentific experiment.
I was under the impression that Photo-JEPG @95% was 4:2:2, hence my interest to know what H.264 @ 100% actually was.
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PhotoJPEG is a great intermediate codec as well as a handy delivery codec in certain situations.
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Sent from my iPad Nano.
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