The VideoLAN Forums

Hey guys, I tried finding this in the forum and I couldn't find anything pertaining to my problem. If there is already a thread please provide a link. Thanks!

First I would like to mention that VLC is the best video player I have ever used and I have never had a problem ever, except till now... I am using build 0.8.6i on Vista Home and Vista Premium. VLC works perfect and flawless except on MP4 videos, especially .MOV. I am using a Kodak Z1012 IS to capture the video and then playing them on my computer. The video format is 1280x720p at 30 fps.

Basically, the video plays fine but the audio is in and out, there is no audio for a few seconds then the sounds comes in for about a second but it is very scratchy. I know it's not the video itself because when I play it in Quicktime or iTunes, it plays just fine.

Thanks for your help!

Have you tried nightlies?
http://nightlies.videolan.org/

Well, I tried the latest release on there and I am still getting the same problem. This time I tried it on a computer with XP as well, and the audio is still scratchy. I am starting to lean towards the possibility that I might not have the right codec. I also found something very strange, if I take a video I shot with the Kodak camera and render it in Vegas 6 as 720p, virtually the exact same, it plays fine, audio and all. The only real difference is that I render it as AVI in stead of MOV, so maybe Kodak and Apple got together and changed the audio codecs just slightly to throw the VLC Team off... OOOHHHH, conspiracy!

Could you provide short sample file with shows this issue (about 5-10 seconds long)?

[removed/]

I've just discovered that I got the same problem when using the nightly build vlc-0.9.2-win32.7z 07/09/2008 02:39.
The files which give me no sound are always MP4 containers (with or without video) with AAC audio.
The same files are playing fine with JB's preview build though.

Examples of files:
http://trailers.nerodigital.com/Warner/GetSmart_HD.mp4 (168 MB)
http://www.sandydoull.com/VCLP0334.MP4 (2.8 MB)
http://www.lillevold.com/files/aac_samp ... 160_51.mp4 (audio only, 625 KB)

Message log for the audio only file:

Thank you Lotesdelere for jumping on this and showing all this information. I should have run the debugger too.

I am still getting scratchy audio with JB's build. Do you have any special codecs installed besides the usual DivX or K-Lite stuff?

I have FFdshow installed but it doesn't matter as VLC is using its own built-in codecs and not the DirectShow ones.
You can use the DMO codecs for Windows Media but you have to specify it because this option is disabled by default. AFAIK there is no other way to use an external DirectShow codec but the WM ones with VLC.

Only audio problems I got with recent builds are the ones I've mentionned in this thread and some files, but not all, using WMA2 codec.
Not to mention that I also have some MP4 files with H264/VC-1 video and AAC audio which are playing fine with both JB's build and the nightly build.

Would you be so kind as to explain how to specify the DMO codecs, please? I thought I could find it but I guess not.

BTW I'm using build 0.9.2.

Thanks

Would you be so kind as to explain how to specify the DMO codecs, please?

More infos in this thread:
viewtopic.php?f=14&t=44013

I've just discovered that I got the same problem when using the nightly build vlc-0.9.2-win32.7z 07/09/2008 02:39.
The files which give me no sound are always MP4 containers (with or without video) with AAC audio.
The same files are playing fine with JB's preview build though.

Examples of files:
http://trailers.nerodigital.com/Warner/GetSmart_HD.mp4 (168 MB)
http://www.sandydoull.com/VCLP0334.MP4 (2.8 MB)
http://www.lillevold.com/files/aac_samp ... 160_51.mp4 (audio only, 625 KB)

For the info, I've just noticed that these MP4 videos start playing with the sound disabled for some reason.
If I activate the audio track then I can hear the sound. It's strange that the sound is enabled by default with some videos and not with some other ones.

The audio only file still doesn't want to play at all though.

EDIT:
Little question: do you have a prefered audio language set in the Audio Language option of the preferences ?
If so, are the videos playing fine if you remove this language and leave this option blank ?

It's blank, I have never even changed the language in VLC before.

I saw that the sound was disabled for them too, but when I enabled them my sound was still not working. I am not sure what to do, they work fine in WMP. So, I guess I will use WMP for those kinds of files but I don't really like WMP considering it's such a big RAM hog.

http://www.sandydoull.com/VCLP0334.MP4 works fine with 0.9.2 using default options. Have you tried to reset VLC settings?

I had a similar problem, but starting VLC with the command line option
--codec=faad
fixed it for me. Make a shortcut and add it after everything else on the target (leave a space after the quote marks).