AAC vs Vorbis for Blu-Ray Rips

[Xyphox]

Hi guys, I can't make up my mind. I'm ripping my blu ray collection, and I can't decide if I should use libvorbis or the libfdk-aac codecs. Any advice would be greatly appreciated.

[Cornucopia]

Well, have you considered NOT re-encoding? (Leaving it as it was in it's original format like the Blu-ray: AC3, LPCM, DTS, MA, HD, etc.) Best quality is retained that way.

If not, I think you need to decide how and where your backups are going to be played. If to be used by hardware devices, you have MUCH better compatibility/support using AAC vs. Vorbis, which has little more than PC/Mac & Android support. Both can be higher bitrate (better quality, larger filesize) or lower bitrate (worse quality, smaller filesize). Vorbis probably has an efficiency edge over AAC-LC, but probably not over HEv1 or HEv2.

Scott

[Xyphox]

Thanks, that helped. I did think about not re-encoding. Those files are just too big. I'm not planning on playing on anything other than my HTPC, so I guess I'll go with Vorbis for efficiency. I want more than 2 channels, so HEv1 or HEv2 won't work for me.

[Cornucopia]

OK, but what constitutes "too big"?

Scott

[Xyphox]

Well, I ripped Raiders of the Lost Ark and the dts file was 3.5 gigs. I would like it to be 1 gig or less.

[fritzi93]

AC3 at 640 kb/s would be under 600 MB for a 2 hour movie. That would have the best compatibility as well if you wish to play the movie on another device.

[Xyphox]

The only problem with AC3 is that it can't handle 8 channels. If the source is 7.1 channel surround sound, I'd like to try to keep it that way.

[poisondeathray]

libopus ?

If compatibility is up for consideration (e.g. devices, hardware), AAC would probably be the best choice for 8ch

If quality/compression is the criteria, then opus would probably be best (consistently rated higher than vorbis or aac, at least at lower bitrates), although you'd be hard pressed to hear the differences between any of them at high bitrates

You can do some small tests and see what types of bitrate ranges and types of audio work best for your setup

[newpball]

I'm not planning on playing on anything other than my HTPC, ....

Then I really do not see the problem:

TOSHIBA MD04ACA400 4TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
Price: $141.50 & FREE Shipping

http://www.amazon.com/TOSHIBA-MD04ACA400-Cache-6-0Gb-Internal/dp/B00MLMNT3A/ref=sr_1_2...=1416941011235

[Xyphox]

I can't find much info about how to encode with opus. It looks like it's variable bit rate, but you choose a target bitrate?

[Xyphox]

I'm not planning on playing on anything other than my HTPC, ....

Then I really do not see the problem:

TOSHIBA MD04ACA400 4TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
Price: $141.50 & FREE Shipping

http://www.amazon.com/TOSHIBA-MD04ACA400-Cache-6-0Gb-Internal/dp/B00MLMNT3A/ref=sr_1_2...=1416941011235

I'm starting to think you might be right. You guys keep changing my mind!

[poisondeathray]

Yes HDD is the best option. You can even get a 4TB HDD (with enclosure) & free shipping for less than $140 these days

If you still wanted to play around with opus, the switch is --bitrate in opusenc
https://mf4.xiph.org/jenkins/view/opus/job/opus-tools/ws/man/opusenc.html

If you're using ffmpeg , -b:a for audio bitrate

[Xyphox]

Yes HDD is the best option. You can even get a 4TB HDD (with enclosure) & free shipping for less than $140 these days

If you still wanted to play around with opus, the switch is --bitrate in opusenc
https://mf4.xiph.org/jenkins/view/opus/job/opus-tools/ws/man/opusenc.html

If you're using ffmpeg , -b:a for audio bitrate

Thanks guys, I got this one: http://www.ebay.com/itm/301380770152

It's a 5tb Seagate for $130 in case the link is broken later. I'll leave the audio untouched. That should keep me busy for a while.