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Old 22nd April 2015, 19:43   #10  |  Link
hello_hello
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Join Date: Mar 2011
Posts: 4,823
One more thought......

Quote:
Originally Posted by Loomes View Post
I did some experiments with NeroAACEnc by doing "eac3to.exe mytrack.ac3 mytrack.m4a -quality=0.5 -2pass" meaning that the (already lossy) AC3 is deflated to WAV first, then compressed to M4A.
How does 2 pass mode make sense for VBR encoding and is it actually possible? I assume so, given you seem to have it working, but I can't coax foobar2000 into combining 2 pass and VBR yet, although it'll happily use ABR encoding with 2 pass. Maybe I'm missing something. I wanted to see if 2 pass VBR produced a different bitrate to single pass VBR.

Normally when you specify a 2 pass encode and a bitrate you're effectively specifying a VBR encode but also the number of bits to use in total. The encoder runs the first pass to work out how to distribute the bits and the second pass encodes to output the requested average bitrate. VBR just encodes without the same bitrate limitation so I'm not sure what the point of 2 passes would be. Anyone know? Does it improve the audio quality?

Last edited by hello_hello; 22nd April 2015 at 19:45.
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