slow playing in lossless formats

[lexx]

 i have ipod 5.5 80gb and i upgrade to the new version of rockbox and i have freezees and slow playing in lossless formats like wav and flac - before i updated all was good why its happen ?

Version: r16976-080405

[lexx]

i found all working i just push on browse .cfg files and chose cfg

[Chronon]

It sounds like some bad settings.  Also, please modify your post if no one has replied.

[lexx]

i think more its rockbox bug

[Mad Cow]

No, flac and wav are really lightweight codecs. WAV has no compression and FLAC is open source, so both are faster than even MP3. Reset your settings and try again.

[markun]

i have ipod 5.5 80gb and i upgrade to the new version of rockbox and i have freezees and slow playing in lossless formats like wav and flac - before i updated all was good why its happen ?

Version: r16976-080405

If resetting your settings doesn't help, can you try older builds until you find exactly which build breaks playback for you?

...FLAC is open source, so ... faster than even MP3.

That statement doesn't make any sense.

[scorche]

...didn't we sort this out in IRC?

From http://www.rockbox.org/irc/log-20080406#04:16:11 to http://www.rockbox.org/irc/log-20080406#04:58:49

[lexx]

yes it was i

[Mad Cow]

i have ipod 5.5 80gb and i upgrade to the new version of rockbox and i have freezees and slow playing in lossless formats like wav and flac - before i updated all was good why its happen ?

Version: r16976-080405

If resetting your settings doesn't help, can you try older builds until you find exactly which build breaks playback for you?

...FLAC is open source, so ... faster than even MP3.

That statement doesn't make any sense.

That I meant to say is that it's much, much better documented. Most MP3 decoders are all reverse engineered, while FLAC decoders are based on the source code and likely much more documentation.

[saratoga]

That I meant to say is that it's much, much better documented.

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.

Most MP3 decoders are all reverse engineered, while FLAC decoders are based on the source code and likely much more documentation.

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).

[Mad Cow]

That I meant to say is that it's much, much better documented.

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.

Most MP3 decoders are all reverse engineered, while FLAC decoders are based on the source code and likely much more documentation.

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).

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]

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.

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