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AC3 or AAC-5.1 for DVD backup on media server
aguy
post Apr 9 2006, 09:39
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Hi there,

I am pretty new to this whole area.

I am planning on setting up a media server with all of my movies stored so they can be watched over network via a HTPC.

I have settled on video encoding with x264. However I can't make up my mind about whether I should leave the audio AC3 stream as is or rencode to AAC 5.1.

I can see advantages to both. Leave as AC3 there is no loss of quality and also will be very close to Bluray and HD-dvd spec. However AAC 5.1 should save space and is the mp4 standard and can be muxed into mp4 container.

I am leaning towards aac 5.1 encoding with the winamp encoder (CT based) but am not sure what bitrate to aim for. (As an idea for all my CD's I am happy with LAME at -preset standard which gives VBR about 192 kpbs).

What do people think I should do?
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stephanV
post Apr 9 2006, 17:47
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If you use 192 kbps for the 5.1 AAC encoding you will save about 100 MB per hour of video. I'm not sure about your encoding methods (what size you aim for, etc.) but IMO this is only worth the effort if you target 1 movie per CD... which you probably don't.


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Dzamburu
post Apr 10 2006, 11:28
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You can use CT @ 96-200kbs for 5.1 encoding and you shouldn't get any artifacts in sound, CT is very good with 5.1 encoding comparing to Nero 6/7 which is very terible.
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chrizoo
post Apr 22 2010, 12:07
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QUOTE (Dzamburu @ Apr 10 2006, 11:28) *
... very good with 5.1 encoding comparing to Nero 6/7 which is very terible.

Is this true? First time that I've heard bad things about Nero AAC. What do you guys think?

This post has been edited by chrizoo: Apr 22 2010, 12:07
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DVDdoug
post Apr 22 2010, 19:08
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QUOTE
However AAC 5.1 should save space...

What's the concern with space? Re-compressing the video can save lots of space, but re-compressing the audio is not going to make that much difference. If you have plenty of space it's not an issue... But, if you can't fit your movies on your hard drive without re-compressing the audio, then you will be in danger of running out of space anyway when you add a few movies.

QUOTE
...and is the mp4 standard and can be muxed into mp4 container.

Compatibility is a valid concern if you want to play the movies on a portable player or other computers. For portable players, MP4/AAC is probably best. For compatibility with varous computers its probably best to leave the whole DVD in DVD format and use DVD-player software. This also leaves the menu intact.

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probedb
post Apr 23 2010, 09:36
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Going AC3->AAC you're also going lossy to lossy. Personally I'd just keep the AC3 track then you can just pass it to your amp to decode. If you go with AAC you're probably stuck with having to do all decoding on your PC.
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Pusherman
post Apr 23 2010, 11:09
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QUOTE (aguy @ Apr 9 2006, 10:39) *
However AAC 5.1 should save space and is the mp4 standard and can be muxed into mp4 container.


With current disk prices i wouldn't bother.
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