Support and General Use > Audio Playback, Database and Playlists
Codec Efficiency Comparison Test (iPod)
Davide-NYC:
OK here is the (very preliminary) wiki page. http://www.rockbox.org/twiki/bin/view/Main/CodecPerformanceComparison
I fixed senab's batchfile (it had a tiny bug in it) and I modified the patch to disply filename, codec, and bitrate in the 'view audio thread' screen.
Let me know what you all think. Running tests now.
saratoga:
--- Quote from: Davide-NYC on October 07, 2006, 07:17:14 PM ---OK here is the (very preliminary) wiki page. http://www.rockbox.org/twiki/bin/view/Main/CodecPerformanceComparison
I fixed senab's batchfile (it had a tiny bug in it) and I modified the patch to disply filename, codec, and bitrate in the 'view audio thread' screen.
Let me know what you all think. Running tests now.
--- End quote ---
That looks fantastic.
soap:
Regarding again the target bitrates:
What is the bitrate variation amongst the encoded files? Are the mp3 encoded files within reasonable tolerances of their ogg counterparts?
The reason I ask is if the "128kb/s" MP3 is actually 120, and the "128kb/s" OGG is actually 132 (or vise versa) that would be more than enough to call the results into question.
Davide-NYC:
--- Quote from: soap on October 07, 2006, 08:39:16 PM ---The reason I ask is if the "128kb/s" MP3 is actually 120, and the "128kb/s" OGG is actually 132 (or vise versa) that would be more than enough to call the results into question.
--- End quote ---
Hmm. Agreed, I'll modify the batch file to encode in CBR in all possible instances.
This morning I was trying to test with an iRiver H3x0 and realized that since there is no HD activity LED on the unit a quick way to determine whether or not there was any disk activity during the boost ratio calculation would be to enable the status bar in the "view audio thread" screen. Good idea?
Of course I have no idea how to do this codewise. ;D
Any care to chime in? I would modify the VAT screen patch accordingly.
bk:
--- Quote from: Davide-NYC on October 08, 2006, 12:38:33 PM ---Hmm. Agreed, I'll modify the batch file to encode in CBR in all possible instances.
--- End quote ---
Forcing CBR for natively VBR formats (Ogg Vorbis) would be misleading. I think the value of these benchmarks is not necessarily in the comparison but rather in the absolute boost level per target. In other words it's less useful to compare codec A to codec B, but more useful to know that codec A is 20% slower on ARM relative to ColdFire.
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