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Old May 8th, 2015, 10:50 AM   #1
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Best H.264 file compression settings for eventual blu-ray encoding

Hi,
I'm sure this sort of question has been asked before but I have a specific remit and 'problem' and have no experience with blu-ray:

I need to upload a file of my film for a festival (it has been accepted). They will prepare / burn it to blu-ray so just need the file. The original file is ProRes codec and is 31GB so no way I can upload that so I need to compress it. The original file is 45 minutes long, 1080i 25fps (actually1440x1080 displayed as 1920x1080).

They say H.264 .mp4 is fine but I have little other info and have no idea how the film will be projected. I have Compressor 4.1 and also the Adobe suit CS6 (though am only familiar with Premier).

Can anyone tell me the best compression settings? I'd like to keep the audio as 24bit 48KHz PCM if possible and for ease of upload keep it embedded in the film. Also should I leave it interlaced? Is .mp4 automatic with H.264 (I get confused by codecs and file formats)?

Thanks.
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Old May 8th, 2015, 09:22 PM   #2
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Re: Best H.264 file compression settings for eventual blu-ray encoding

Everybody wants "the best." What's wrong with second best these days???

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Old May 9th, 2015, 02:48 AM   #3
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Re: Best H.264 file compression settings for eventual blu-ray encoding

Tell me your second best advice then
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Old May 9th, 2015, 03:59 AM   #4
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Re: Best H.264 file compression settings for eventual blu-ray encoding

Use Adobe Encore if you want to retain 24bit PCM audio.

Most likely, 25mbps would be good enough for 1440x1080 video encoding in "AVC" for Blu-ray. If you specify the project to be interlaced, it will retain that throughout. I'd highly recommend "VBR" 2-pass to maximize quality.

.mp4 doesn't commonly support interlaced H.264 video with PCM audio. .m2ts supports it more, and that's what Encore is most likely going to output.

You can ask around on a how to for Adobe Encore as you will get much better results from that if you're outputting to Blu-ray.
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Old May 9th, 2015, 10:55 AM   #5
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Re: Best H.264 file compression settings for eventual blu-ray encoding

Thanks Jack will give it a go
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Old May 17th, 2015, 09:01 AM   #6
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Re: Best H.264 file compression settings for eventual blu-ray encoding

You're taking about two outputs: bluray and upload for the web they aren't always compatible. Bluray is very particular on how it's encoded while video uploaded for the web not so much since it will be reencoded by the site so it more about making it small enough to upload while retaining as much quality as possible. For both I recommend exporting 30 second excerpt to test. You don't want to spend 5 hrs encoding to have to start over again.

Deinterlacing can make things too soft.
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