IPB

Welcome Guest ( Log In | Register )

-V2 gives way too high bitrate!?!
masterridley
post Mar 29 2010, 16:48
Post #1





Group: Members
Posts: 3
Joined: 29-March 10
Member No.: 79426



I use dbpoweramp and I encode flac tracks to LAME 3.98r -V2. Usually this results in ~170 to ~220 kbps files (close to 192kbps CBR quality)

Well, not so for 2 As I Lay Dying albums that I have (think REALLY LOUD metal). When I encode those I get 230-270 kbps and of course the resulting files are quite big.

My question is: is this a bug or completely natural?
Furthermore (if it's not a bug), isn't it just better to encode in 192kbps and get a smaller file, since that's the quality I was going for anyway?

Cheers
Go to the top of the page
+Quote Post
 
Start new topic
Replies
[JAZ]
post Mar 31 2010, 10:25
Post #2





Group: Members
Posts: 1783
Joined: 24-June 02
From: Catalunya(Spain)
Member No.: 2383



I would like an answer from robert, or someone that has studied this part of the code.

My interpretation of what i've heard is that in CBR mode, the code works in a way that increases the resolution only if enough bits are free and only by the amount the free bits allow. (Effectively, trying to maximize the quality for the given amount of bits).
In other words, at 320kbps, it would be working more like -V0 (without -Y), and at 192kbps would be working more like -V3 (with -Y)


@Aleron : Your explanation of the subject is correct and correlates to what i've written. I will use part of your tests to make the technical part more understandable.
Go to the top of the page
+Quote Post
Aleron Ives
post Mar 31 2010, 10:53
Post #3





Group: Members
Posts: 189
Joined: 22-March 10
From: California
Member No.: 79208



QUOTE ([JAZ] @ Mar 31 2010, 02:25) *

I would like an answer from robert, or someone that has studied this part of the code.

My interpretation of what i've heard is that in CBR mode, the code works in a way that increases the resolution only if enough bits are free and only by the amount the free bits allow. (Effectively, trying to maximize the quality for the given amount of bits).
In other words, at 320kbps, it would be working more like -V0 (without -Y), and at 192kbps would be working more like -V3 (with -Y)

Would I be correct in assuming that every bitrate except 320 would probably behave as though -Y was enabled, seeing as since 320 is the maximum bitrate, -Y isn't really needed? If so, perhaps 320 isn't the best CBR example to use in the explanation, as it's sort of the exception to the rule.

I figure there must be some correlation between -Y in VBR and CBR mode, seeing as the LAME long help says:

-Y lets LAME ignore noise in sfb21, like in CBR

QUOTE ([JAZ] @ Mar 31 2010, 02:25) *
@Aleron : Your explanation of the subject is correct and correlates to what i've written. I will use part of your tests to make the technical part more understandable.

If you feel that I've correctly distilled the essence of -Y's function, feel free to use anything that you think would improve the quality and accessibility of the wiki entry. My paraphrase certainly isn't as precise as your post, but I hope it might be slightly more understandable to the layman who could still be somewhat confused after reading your in-depth explanation.
Go to the top of the page
+Quote Post

Posts in this topic
- masterridley   -V2 gives way too high bitrate!?!   Mar 29 2010, 16:48
- - dv1989   Natural. VBR targets quality, not bitrate. Loud me...   Mar 29 2010, 16:52
|- - dsimcha   QUOTE (dv1989 @ Mar 29 2010, 11:52) Natur...   Mar 29 2010, 16:56
- - [JAZ]   metal (being loud and "noisy"*) kicks on...   Mar 29 2010, 17:06
- - masterridley   Damn! That's what I suspected too (compres...   Mar 29 2010, 17:07
- - robert   You could update to LAME 3.98.4, as previous 3.98 ...   Mar 29 2010, 17:13
- - pdq   QUOTE (masterridley @ Mar 29 2010, 11:48)...   Mar 29 2010, 17:14
- - dv1989   QUOTE (pdq)If you really want the best quality whi...   Mar 29 2010, 17:24
- - masterridley   QUOTE (JAZ)Two ways to workaround (workaround not ...   Mar 29 2010, 17:26
- - greynol   -Y does not cut content above 16k; it is not a low...   Mar 29 2010, 17:43
- - lvqcl   QUOTE Regarding -Y, doesn't it kick in with -V...   Mar 29 2010, 18:06
- - Aleron Ives   I hate to continue discussion about -Y since it se...   Mar 30 2010, 04:59
|- - greynol   QUOTE (Aleron Ives @ Mar 29 2010, 20:59) ...   Mar 30 2010, 05:20
|- - Aleron Ives   QUOTE (greynol @ Mar 29 2010, 20:20) QUOT...   Mar 30 2010, 05:48
- - shadowking   I suggest not to fiddle with -Y . If you want a lo...   Mar 30 2010, 11:10
|- - Aleron Ives   QUOTE (shadowking @ Mar 30 2010, 02:10) I...   Mar 30 2010, 23:38
- - [JAZ]   I am preparing to put this on the wiki (but my use...   Mar 30 2010, 12:03
- - benski   very short version: -Y switch makes LAME not encod...   Mar 30 2010, 17:35
- - greynol   It was not too long and is well worth reading, ben...   Mar 30 2010, 17:42
|- - benski   QUOTE (greynol @ Mar 30 2010, 11:42) It w...   Mar 30 2010, 17:44
- - greynol   I hope you caught my edits above since I think you...   Mar 30 2010, 17:55
- - [JAZ]   I would like an answer from robert, or someone tha...   Mar 31 2010, 10:25
|- - Aleron Ives   QUOTE ([JAZ] @ Mar 31 2010, 02:25...   Mar 31 2010, 10:53
|- - robert   QUOTE ([JAZ] @ Mar 31 2010, 11:25...   Mar 31 2010, 12:33
- - shadowking   -Y is still 'experimental'. It was never ...   Mar 31 2010, 11:52
|- - Aleron Ives   I would like to thank robert for explaining the co...   Mar 31 2010, 23:58
- - [JAZ]   Thanks robert. I've used your explanations as ...   Mar 31 2010, 13:16
- - Ajax   The original poster "masterridley" (a ne...   Mar 31 2010, 14:16
- - robert   global gain: is the global quantization step size ...   Mar 31 2010, 14:25
- - pdq   @[JAZ] You might also point out that for older fo...   Mar 31 2010, 14:47
- - shadowking   We should not be recommending or documenting -Y un...   Mar 31 2010, 14:53
- - dv1989   QUOTE (Knowledgebase)LAME Y SWITH Surely I needn...   Mar 31 2010, 15:04
- - [JAZ]   DOH! I saw something strange in that, but i d...   Mar 31 2010, 20:45
- - dv1989   The spelling was one thing. Also, it may not matte...   Mar 31 2010, 21:09
- - shadowking   This is still going back to my point. Users don...   Apr 1 2010, 10:49
|- - Aleron Ives   QUOTE (shadowking @ Apr 1 2010, 02:49) Th...   Apr 1 2010, 11:18
|- - greynol   QUOTE (shadowking @ Apr 1 2010, 02:49) Us...   Apr 1 2010, 18:28
- - [JAZ]   Robert, can you comment on this line of the articl...   Apr 1 2010, 11:22
- - robert   QUOTE If global gain is zero, resolution will need...   Apr 1 2010, 11:37
- - [JAZ]   Talk about failing to read... I didn't ful...   Apr 1 2010, 13:39


Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



RSS Lo-Fi Version Time is now: 1st October 2014 - 11:17