The VideoLAN Forums

Hi,

Been reading the boards about this problem. I have a .vob file with 48 KHz LPCM audio, but when I try to play it in vlc, I get no audio. I might be wrong, but I read that this is a known issue. Any ETA on a fix?

I am having the problem with my iBook running OS X 10.3.5, using both 0.7.2 and the 0.7.3 nightly build 200308220302.

Oddly enough though, I tried using 0.7.2 on my XP SP2 box, and the same file plays fine. Any ideas as to why this happens?[/i]

Apparently, VLC version 0.7.2, 0.7.1 and 0.7.0 have problems playing .VOB files or DVDs with LPCM audio tracks. VLC version 0.6.2 plays these files fine. You can download the older version here:

http://download.videolan.org/pub/vlc/0.6.2/macosx/

Meanwhile, i'll try using VLC test version 0.8.0 and see what happens.

Best Regards,

Jervon Nah Guo Yuan
Singapore

it is still broken. or rather the Mac OS X audio resampler is broken which requires us to make some circumvention in the lpcm decoder, which we just haven't gotten around to.

I also experience problems with LPCM audio in VOBs, the sound is played back, but there are a lot of audible clicks in it, and the volume is insanely loud (those files play perfectly in all other players i tried...)
I'm using 0.7.2 on W2K Pro (audio out is set to DirectX but other modes have the same terrible sound, the files are NTSC by the way...)

I found out about 0.6.2 after reading someone else trying it in the forums. Sound works great now, but the CPU usage is 60% or higher when playing a video. It seems that 0.6.2 doesn't offload video processing to the GPU, like some Windows DVD players do with DirectX. Just out of curiosity, does Mac OS X have the ability to offload video processing like Windows does with DirectX?

No it does not. Or rather not directly. With optimizations such as in 0.7.1 and OSX 10.2 and above, however, the ENTIRE screen uses such offloading...

Excuse this is regarding the audio - no playback - recurring problem

I have a VCD video which plays but gets this bug report:
coreaudio: AudioStreamAddPropertyListener failed: [nope]
coreaudio: InitDevice failed
main: cannot add user channel mixer a52tospdif


here are the specs on the file

video
512x384

Audio
codec a52
channels 2
48Khz
192000 bps

I am running OS X 3.5 on a G5 with gbram etc

what I want to report is, in system prefs, the audio output always reverts to digital, and I have built-in audio only.

my question is there a fix because I assume if I can get the audio to play through built-in, I'd be fine.

Also someone mentioned an a52 plugin, where might I find that?

And should I just use an earlier version of VLC, if so which?

-J

Apparently, VLC version 0.7.2, 0.7.1 and 0.7.0 have problems playing .VOB files or DVDs with LPCM audio tracks. VLC version 0.6.2 plays these files fine. You can download the older version here:

http://download.videolan.org/pub/vlc/0.6.2/macosx/

Meanwhile, i'll try using VLC test version 0.8.0 and see what happens.

Best Regards,

Jervon Nah Guo Yuan
Singapore

thanks ! now ,i use the 0.6.2 vlc for DVD with lpcm audio file and it work!

DJ, that sounds rather weird. I mean it's LPCM - why would you need to resample it?