benh wrote: > I understand what you are saying, and your example is helpful. > > I think perhaps I have been misunderstanding the nature of this > particular encoding error. I had understood it to be an error in > encoding some audio at an arbitrary and random timecode. What I now > speculate may be happening is that the error is at a fixed place near > the end of the file, perhaps in some kind of footer. > > Otherwise, I would expect some variability in when the file stops > playing, and it is very consistent. > > I haven't been able to find adequate documentation of the ALAC format > yet to see how a file is structured, so I haven't really validated this > idea. > > Some more information: > > ffmpeg gives this error when transcoding one of the example files to > aac: > [alac @ 0x55794a5e1c40] invalid samples per frame: 0/s speed=79.3x > Error while decoding stream #0:0: Invalid data found when processing > input > > Of note, I can transcode the original source flac with ffmpeg with no > issues, so the error seems to have been introduced when I used XLD to > transcode from FLAC to ALAC. > > What's **really** interesting is that I can use ffmpeg to transcode the > original source FLAC and the XLD-transcoded (with error) ALAC both to > aac, and end up with *identical* files, despite the error thrown by > ffmpeg when transcoding the ALAC file. That is to say, an md5 hash of > each outputted file is identical. Both play to the very last note > outside of LMS, and I haven't yet tried them within LMS. > > This suggests to me that the payload of the misencoded file is intact > and that the error is in a container structure.
My observation on the Smokey Robinso file was an error toward the *very* end (confirmed by both ffmpeg and my built-in decoder) which again caused the player to raise an error (STMn) and as a result LMS immediately stops playback for *synchronized players*, discarding all what is in the decoded buffer, which can be a lot as decoding happens way ahead of playback. Standalone players are not affected neither are groups when there is transcoding happening as faad does not/cannot return an error, simply it returns EoF and all the previously decoded audio is already piped to flac and will be played. LMS 8.2 on Odroid-C4 - *SqueezeAMP!*, 5xRadio, 5xBoom, 2xDuet, 1xTouch, 1xSB3. Sonos PLAY:3, PLAY:5, Marantz NR1603, Foobar2000, ShairPortW, 2xChromecast Audio, Chromecast v1 and v2, Squeezelite on Pi, Yamaha WX-010, AppleTV 4, Airport Express, GGMM E5, RivaArena 1 & 3 ------------------------------------------------------------------------ philippe_44's Profile: http://forums.slimdevices.com/member.php?userid=17261 View this thread: http://forums.slimdevices.com/showthread.php?t=114439 _______________________________________________ plugins mailing list plugins@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/plugins
