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Topic: Azid: To compress or not? (Read 3247 times) previous topic - next topic
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Azid: To compress or not?

Just curious.


I've been converting AC3 (2CH) streams to WAV files using Azid, and I was just wondering if there is a "best practice" regarding the compression setting. The intended use of the resulting WAV file is to create a standard audio CD.

Do most people leave the audio unaltered, or apply some amount of compression? I would think that light compression might be the way to go.

Thanks,

Brett
flac > schiit modi > schiit magni > hd650

Azid: To compress or not?

Reply #1 –
Personally, I never use compression because the audio from either my SVCD's or Ac3 xvid rips are run through my home stereo system.

I also remove the 3 db cut in the LFE channel as well.

Anything other than full dynamic range is distortion to me.

I think I remember the issue as being the fact that most small computer speaker systems could not accurately follow the dynamic swings.

My Yamaha amp has a compression option for watching movies late at night while others are sleeping etc. I am not sure but I think most better quality surround amps have this option as well.

Azid: To compress or not?

Reply #2 –
According to my research on Doom9's forum and this forum:

Always try to get the 2.0 ac3 (if exists)
If not get the 5.1 ac3
Ac3Delay correct the file
Then use Azid

Divx
for 3/2 ac3
azid -n1 -c normal -L -3db -F wav24 -a
for 2/0 ac3
azid -c normal -F wav24 -a

VCD
for 3/2 ac3
azid -n1 -c light -L -3db -F wav24 -a
for 2/0 ac3
azid -c light -F wav24 -a

Music or Concert
for 3/2 ac3
azid -L -3db -F wav24 -a
for 2/0 ac3
azid -F wav24 -a

SSRC (before lossy compression afterwards like mp2, mp3, vorbis etc.)
ssrc --rate 44100 --bits 16 --twopass --dither 1 --pdf 1 1 infile.wav outfile.wav

mp3 1cd divx
--abr 128 -h --nspsytune --athtype 2 --lowpass 16 --ns-bass -8 --scale 1 then mp3gain max noclip

mp2 for VCD
toolame -ms -p2 -b224 -e "foo.wav" "foo.mp2"

Any suggestions for better quality/alternative methods?

Azid: To compress or not?

Reply #3 –
Quote
Music or Concert
for 3/2 ac3
azid -L -3db -F wav24 -a
for 2/0 ac3
azid -F wav24 -a

Why the 24bit WAV output? Is that improve the quality when downsampling?
flac > schiit modi > schiit magni > hd650