Rockbox General > Rockbox General Discussion
slow playing in lossless formats
Mad Cow:
--- Quote from: saratoga on April 08, 2008, 07:12:23 PM ---
--- Quote from: Mad Cow on April 08, 2008, 06:34:39 PM ---That I meant to say is that it's much, much better documented.
--- End quote ---
They're actually both about equally well documented, with mp3 maybe a bit better since theres so many books written about it and so many decoders to look at.
--- Quote from: Mad Cow on April 08, 2008, 06:34:39 PM --- Most MP3 decoders are all reverse engineered, while FLAC decoders are based on the source code and likely much more documentation.
--- End quote ---
I don't think there are any reverse engineered MP3 decoders. Its actually an open format, with the mpeg people distributing both the spec and a reference codec (dist10).
--- End quote ---
Really? I always thought that mp3 wasn't completely open. Oh well, I guess I'm wrong there, but I do remember seeing a chart somewhere on the wiki which showed how much CPU power each codec used and FLAC used less than MP3.
Chronon:
Mad Cow, maybe the confusion is over decoders vs. encoders.
AlexP:
--- Quote from: Mad Cow on April 09, 2008, 11:53:20 AM ---Really? I always thought that mp3 wasn't completely open. Oh well, I guess I'm wrong there, but I do remember seeing a chart somewhere on the wiki which showed how much CPU power each codec used and FLAC used less than MP3.
--- End quote ---
FLAC does use less CPU (but hits the disk more often) than MP3, but this is due to how each codec works, nothing to do with being open source/close source/whatever.
Llorean:
In fact, FLAC was more or less engineered to be as quick a decode as they could make it while still having decent compression for lossless.
ebag4:
I also have a iPod 5.5G 80 Gig unit. I installed the current build of Rockbox yesterday, 3/10/08. My FLAC files are stuttering as well. I reset the Rockbox settings as recommended earlier in this thread, however I am still getting stuttering. MP3 files seem to play OK. I have used these same FLAC files for a number of years first with FOOBAR and now with a Squeezebox SB3 as well with no issues. Are there any other recommendations? If it is recommended to load a previous version of Rockbox, which version is recommended? Stuttering (about a 1 second pause in play) seems to be intermittent, meaning that not all songs stutter and the ones that have so far have not necessarilly stuttered throughout the entire song. I have just loaded my music database today so my experience so far is limited to very few songs. So far this is what I have documented. I intially thought it might have something to do with the bitrate, but that theory doesn't seem to hold true.
Track Bitrate Time Note Note 2
1 1055 3:56 Stuttered Immediately Didn't Stutter, no buttons pushed, album restarted after finishing last song
2 1001 3:26 Stuttered Immediately Didn't Stutter, no buttons pushed, let album continue to play
3 916 4:04 Stuttered Immediately Stuttered @ 1:10
4 859 4:19 Stuttered Immediately Didn't Stutter
5 1028 4:17 Stuttered Immediately Didn't Stutter
6 1021 2:37 Stuttered Immediately Stuttered immediately
7 1055 3:41 Stuttered Immediately
8 979 3:36 No Stutter
9 1068 3:51 No Stutter
10 856 3:52 Stutter @ 1:16
11 948 2:33 No Stutter
12 978 4:26 Stutter@ 2:40
Album 2
1 939 2:36 No Stutter
2 848 6:41 No Stutter
3 888 6:28 No Stutter
4 923 6:25 Stutter@ 3:36
5 893 4:34 No Stutter
6 795 2:12 No Stutter
7 981 2:29 Stutter@ 1:40
8 849 4:42 No Stutter
9 930 8:28 Stutter @ 4:56
Thanks for any recommendations.
Best,
Ed
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