Hi everyone!
I'm posting it here since I'm not sure if filing it on flyspray would be justified, so I'm hoping that someone can confirm this and take appropriate actions.
Subject: Two "FLAC-with-Cuesheet-playback" issues, possibly related.
Quick description of issue #1: While playing certain (but not all) FLAC files with CUE support, the "skip to next track" command won't work on certain tracks on that cuesheet, will skip to other tracks just fine.
Quick description of issue #2: While playing (all?) FLAC files with CUE support, the "skip to next track" while listening to the last track of the cuesheet will freeze the Rockbox resulting in an error: I05:DivX0 at 31010E46 (or at 31010E4E).
Equipment used: Cowon iAudio M5L
Rockbox version: tested on r13696-070624 and r13708-070625
Rockbox settings: Cuesheet support ON, other on default
FLAC files: Ripped form my original CDs with EAC (to WAV and cuesheet) in secure mode and processed with FLAC 1.12 and/or 1.14 compression level 8. MD5 checksums on cuesheets and FLACS checked. Cuesheet syntax OK, cuesheet file encoding UTF8-DOS and/or DOS. Works properly my on computer.
Full description of issue #1:
While playing certain (but not all) FLAC files with CUE support (played by navigating to FLAC file in "FILES" mode and pressing play), the "skip to next track" command won't work on certain tracks on that cuesheet, but will skip to other tracks on that CUE just fine. It occurs while in both "now playing" or "browse cuesheet" screen. When I try to skip to certain tracks on CUE, the current playback will stop for a moment and the icon indicates disk usage (just like normal) but it wont skip to appropriate position, just resume playback at current track/position. I have experienced this on multiple files, encoded with FLAC 1.12 and 1.14.
Issue #1 - Tested:
* Found two cases (FLAC + CUE files) in my collection (but I'm sure there are many more) that have this problem.
* These files play without a problem on my computer with Foobar2k and were securely ripped form original CD and encoded (with differnet FLAC versions), MD5 checksum-ed and CUEsheets checked for proper syntax - ALL FINE.
1.) I verified that the issue occurs while trying to navigate to track #9 in case of FLAC file A, and track #7 on FLAC file B. Track start times on both files are different, different lengths and don't seem to have some kind of "pattern" or to differ (in terms of length, index position,..) from tracks on cuesheet that skip-to normally.
2.) I substituted the A and B FLAC files with FLAC file C (which is a FLAC from a different CD) and preserved the original cuesheets A and B and tried to play FLAC C with these two cuesheets to confirm if it is a problem with a cuesheet. Everytrhing worked as it should and the problem did not occur. So I think that rules out the cuesheet as the only cause of the problem.
3.) I used both cuesheets A and B and both FLAC files A and B, but played FLAC A with cue B and vice-versa. Everything played OK, even on previously problematic positions. (of course the cuesheet info wasn't correct for that FLAC, since they were swapped, but skipping to tracks worked) That seemed to indicate that there might be a problem with a specific position/time in the FLAC file that the playback wont jump to.)
4) I altered both cuesheets from previous (3.) test so that I entered the correct/problematic INDEX of _one_ of the cuesheet tracks to match the track index of original cuesheet, so that it "hit" that problematic position. So While I played FLAC A with modified cue B (entered the problematic time/index of cue A to one of the tracks) the problem reoccured! I could not skip to that (altered) track position.
This led me to believe that this problem occurs when the track index in cuesheet "hits" a certain time/spot on a specific FLAC file.
5.) This time I checked what will happen if I use a third CUESHEET (from some other CD) on original A and B FLAC files. Everything worked OK. No surprise, as that third cuesheet did not have the track index time of that problematic position.
4.) This time I reencoded both A and B FLAC files with a different FLAC version (now 1.14, was 1.12) and tested again. Previously problematic tracked worked OK!
BUT problem started occuring on other tracks now, on file A on track #13, while FLAC B now had multiple problems: track #2, 5, 8, 14! This suggest that it is not an encoding problem.
Once again, these files work flawlessly on my computer and are proper lossless conversions (I also always use the VERIFY function while converting to/from FLAC)
So the conclusion would be: When cuesheet index of a track "hits" just the right position in a FLAC file, regardless of its encoding the issue will occur. Also, this also isn't an uncommon problem since I experienced it on 4 occasions and seems to be not-that-hard to find if you test several FLAC + cue combos.
I realize that this happens only with certain FLAC and track indexes COMBOS so it might be harder to recreate, but it really seems not that uncommon. And if not otherwise, I could supply the FLACS in questions (but each is several hundred MBs long and may be illegal to distribute it). I believe it can be recreated with just about any FLAC file, by finding a proper CUEsheet track index. It would be highly unusual that it would happen so frequent in my collection if it was an "isolated case" and I honestly believe it has nothing to do with FLAC or CUE files and that they are encoded correctly and accurately.
Full description of issue #2:
While playing (all it seems) FLAC files with CUE support, the "skip to next track" while listening to the last track of the cuesheet will freeze the Rockbox resulting in an error: I05:DivX0 at 31010E46 (or at 31010E4E). This seems to happen everytime on all FLAC files (tested with FLAC 1.12 and 1.14 encoding). The current (last in cuesheet) track plays for a second while you press "skip to next" button and then crashes.
r13696-070624 results in error: I05:DivX0 at 31010E46
while r13708-070625 in: I05:DivX0 at 31010E4E
After the crash all buttons stop functioning, you can only reboot.
Wooooo that was a long test/post, but it was worth it if you guys can recreate & fix this :)
Last but not least - Rockbox is an amazing project and I wish you guys all the best and I bug reports like this help you with your work.
Cheers!
/me
Rockbox Technical Forums
Topic: [BUG report] FLAC with Cuesheet playback issues (Read 3231 times)