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Topic: vbr vs. abr question (Read 4593 times) previous topic - next topic
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vbr vs. abr question

Is vbr always better than abr at the same average bitrate?

vbr vs. abr question

Reply #1 –
No, at medium to low bitrates (140 and below, i would say), ABR increasingly becomes the better choice. Talking about LAME, of course.

vbr vs. abr question

Reply #2 –
Yeah, Lame definitely.

then --alt-preset xxx should use vbr at 140kbps or above.

vbr vs. abr question

Reply #3 –
Quote
Originally posted by mp3chan

then --alt-preset xxx should use vbr at 140kbps or above.


No, that's what the VBR alt-presets are for. How do you wanna control VBR bitrate like you do with ABR? And ABR can also be useful sometimes... my brother uses higher-bitrate ABR quite often, because VBR is too slow for him on his old PC.

vbr vs. abr question

Reply #4 –
What about 2 pass encoding? Is it possible to implement such a way like in divx encoder?

I think 2 pass encoding can make vbr at certain final avg. bitrate.

vbr vs. abr question

Reply #5 –
2 pass would rock hard

but simes like nobody wanst to implant this in ther encoder

I´m using a 3. party programs to get a kind off 2 pass ABR
Sven Bent - Denmark

vbr vs. abr question

Reply #6 –
Quote
Originally posted by sven_Bent
I´m using a 3. party programs to get a kind off 2 pass ABR


What programs are able to encode 2 pass ABR?

vbr vs. abr question

Reply #7 –
what sort of data can I use from an mp3 frame header to know if the file was ABR?

is there an extra tag like the 'Xing' tag?

cheers!
\'cHANCE favors the prepared mind\' Louis Pasteur

vbr vs. abr question

Reply #8 –
It's easy to tell ABR... check the file out in Winamp or in EncSpot... the majority of the frames should be a certain bitrate (128 for example), with the immediate higher and lower bitrates (112 and 160 in this case) being the next-most used.

Typically, by comparison, VBR usually looks more evenly distributed among 2 or 3 different bitrates... and more random too. Some music will produce a lot of low or high bitrates in a VBR MP3...

vbr vs. abr question

Reply #9 –
I've always wondered... WHY is VBR inferior to ABR at lower bitrates? Is it just because VBR is not yet well tuned for these bitrates? Will it beat ABR in later versions of LAME?

vbr vs. abr question

Reply #10 –
Do you think the difference between abr and vbr is only the way it distributes bitrate?

vbr vs. abr question

Reply #11 –
Quote
Originally posted by mp3chan
Do you think the difference between abr and vbr is only the way it distributes bitrate?
Well, there's is a difference how the desired bitrate is chosen. Check out this message: http://www.hydrogenaudio.org/forums/showth...12347#post12347

Basically ABR uses more rough method called perceptual entropy, while VBR relies on allowed quantization noise.
Juha Laaksonheimo