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Experimental Ogg vorbis Bitrate Peeler, Bitrate reduction of ogg vorbis
vinjey
post May 20 2005, 20:10
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Hi All,

Ours is an embedded software solutions company that focuses on developing embedded software solutions specific to the DSP market. Today we have released free trial version of the VINJEY ogg vorbis decoder available for download.

http://www.vinjey.com/ogg_downloads.html

On the downloads section we have provided experimental version of the bitrate peeler. This bitrate peeler reduces the bitrate by cutting the packets based on the factor input provided by the user. Source code of this experimental bitrate peeler comes along with our free trial version of the decoder.

Regards,
Vinoth
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rutra80
post May 21 2005, 21:31
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Guruboolez did you try to compare to transcoded files? I mean, having that 172kbps OggVorbis file as the source, which one sounds better - the same file peeled to 82kbps, or the same file transcoded to 82kbps? AFAIK peeling is supposed to give better quality than transcoding within the same format...
Anyway, it's good to have the very first bitrate peeler (correct me if I'm wrong). Keep improving it vinjey smile.gif

This post has been edited by rutra80: May 21 2005, 21:38
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moozooh
post May 23 2005, 11:49
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QUOTE (rutra80 @ May 21 2005, 11:31 PM)
AFAIK peeling is supposed to give better quality than transcoding within the same format...
*

If you re-encode the file, psymodel is applied.
AFAIK, when you peel, it isn't.
That's why peeling is not a useful option, anyway…


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Robin
post May 23 2005, 13:05
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QUOTE (Mo0zOoH @ May 23 2005, 02:49 AM)
If you re-encode the file, psymodel is applied.
AFAIK, when you peel, it isn't.
That's why peeling is not a useful option, anyway…
*


Can't a peeler use the same psymodel as the encoder, to somehow peel the bits with the least impact? (I'm a n00b)
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Ariakis
post May 23 2005, 13:10
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QUOTE (Robin @ May 23 2005, 07:05 AM)
Can't a peeler use the same psymodel as the encoder, to somehow peel the bits with the least impact? (I'm a n00b)
*


This complexity could be avoided if the encoder just arranged data within the packets in such a way that the most important information was at the beginning of each one. Then the peeler could trust the original encoder's psymodel evaluation and truncate the packets, leaving optimal quality at the desired bitrate, with no extra complexity. Measure once, cut twice, one might say? blink.gif

This post has been edited by Ariakis: May 23 2005, 13:11
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Robin
post May 23 2005, 13:13
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QUOTE (Ariakis @ May 23 2005, 04:10 AM)
This complexity could be avoided if the encoder just arranged data within the packets in such a way that the most important information was at the beginning of each one.  Then the peeler could trust the original encoder's psymodel evaluation and truncate the packets, leaving optimal quality at the desired bitrate, with no extra complexity.  Measure once, cut twice, one might say?  blink.gif
*


A really good idea, and I take it that oggenc doesn't arrange the data in this way yet...
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Posts in this topic
- vinjey   Experimental Ogg vorbis Bitrate Peeler   May 20 2005, 20:10
- - guruboolez   I've tried, and it's amazingly fast!...   May 21 2005, 02:12
- - guruboolez   I kept the same track, start to encode it at q10 (...   May 21 2005, 02:32
- - rutra80   Guruboolez did you try to compare to transcoded fi...   May 21 2005, 21:31
|- - Garf   QUOTE (rutra80 @ May 21 2005, 10:31 PM)Anyway...   May 21 2005, 21:38
||- - kjoonlee   QUOTE (Garf @ May 22 2005, 05:38 AM)QUOTE (ru...   May 27 2005, 09:19
||- - Garf   QUOTE (kjoonlee @ May 27 2005, 10:19 AM)Minor...   May 27 2005, 09:56
|- - Mo0zOoH   QUOTE (rutra80 @ May 21 2005, 11:31 PM)AFAIK ...   May 23 2005, 11:49
||- - Robin   QUOTE (Mo0zOoH @ May 23 2005, 02:49 AM)If you...   May 23 2005, 13:05
||- - Ariakis   QUOTE (Robin @ May 23 2005, 07:05 AM)Can...   May 23 2005, 13:10
||- - Robin   QUOTE (Ariakis @ May 23 2005, 04:10 AM)This c...   May 23 2005, 13:13
|- - guruboolez   QUOTE (rutra80 @ May 21 2005, 09:31 PM)Gurubo...   May 24 2005, 08:50
- - maikmerten   well, the bad quality is no surprise. Just choppin...   May 21 2005, 22:07
- - HbG   And now for the million dollar Question: Why doesn...   May 23 2005, 13:14
|- - Ariakis   QUOTE (HbG @ May 23 2005, 07:14 AM)And now fo...   May 23 2005, 13:26
- - Ariakis   Nope, not yet. I've never really looked at th...   May 23 2005, 13:19
- - vinjey   Hi All, Thanks for the testing and inputs pro...   May 24 2005, 20:55
|- - de Mon   QUOTE (vinjey @ May 24 2005, 11:55 AM)Now wit...   May 26 2005, 20:38
- - kjoonlee   Heh. Thanks. So.. aard means ground (like in aard...   May 27 2005, 10:30
|- - Squeller   QUOTE (kjoonlee @ May 27 2005, 01:30 AM)aarda...   May 27 2005, 14:41
- - Garf   Exactly.   May 27 2005, 10:34
- - xmixahlx   lol does that mean "ground apple" ?   Oct 25 2005, 19:59
|- - ChuckSplatt   QUOTE (xmixahlx @ Oct 25 2005, 10:59 AM)lol d...   Oct 25 2005, 20:11
- - stephanV   I wouldn't translate 'aarde' to 'g...   Oct 25 2005, 20:21


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