No sound with VOB file

Hi All,
I copied a VOB formatted file from a DVD to my harddrive. And am using a .Net 4 app running in 64 bit mode (one which I developed to play video with a WPF MediaElement screen). The picture is perfect but I don't get any sound. Media Player Classic and Windows Media Player both play the file fine including sound. And my app plays lots of other video formats perfectly.

Is there a tweak I need to make in the Klite codec settings for this VOB audio (AC-3)? I believe the .Net WPF MediaElement uses ffdshow decoders.

Also, any idea why the VOB file will not play at all (no video or audio) when I try to play it direct from the DVD disk? I only plays after it is copied to my harddrive.

Thanks for any suggestions.

System:
Windows 7 Home SP1 (64 bit),
onboard sound card (Realtek High Def Audio)
K-Lite Codec Pack 64bit - version 6.2.0
K-Lite Mega Codec Pack (32bit) - version 8.7.0

FFDSHOW 64bit audio decoder - AC-3 set to libavcodec


MediaInfo for the target VOB file.
=======================
Complete name : C:\2-MEDIA\DVD\VTS_05_1.VOB
Format : MPEG-PS
File size : 67.3 MiB
Duration : 2mn 0s
Overall bit rate mode : Variable
Overall bit rate : 4 704 Kbps

Video
ID : 224 (0xE0)
Format : MPEG Video
Format version : Version 2
Format profile : Main@Main
Format settings, BVOP : Yes
Format settings, Matrix : Default
Format settings, GOP : M=3, N=13
Duration : 2mn 0s
Bit rate mode : Variable
Bit rate : 4 418 Kbps
Maximum bit rate : 6 500 Kbps
Width : 720 pixels
Height : 480 pixels
Display aspect ratio : 4:3
Frame rate : 29.970 fps
Standard : NTSC
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Scan order : Top Field First
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.427
Stream size : 63.2 MiB (94%)
Color primaries : SMPTE 170M
Transfer characteristics : SMPTE 170M
Matrix coefficients : SMPTE 170M

Audio
ID : 189 (0xBD)-128 (0x80)
Format : AC-3
Format/Info : Audio Coding 3
Mode extension : CM (complete main)
Format settings, Endianness : Big
Muxing mode : DVD-Video
Duration : 2mn 0s
Bit rate mode : Constant
Bit rate : 192 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Compression mode : Lossy
Stream size : 2.75 MiB (4%)

If playback works in MPC and WMP, then there is little help I can provide. But since both are 32-bit apps, you should also test with 64-bit GraphStudio from the pack.

Admin wrote:If playback works in MPC and WMP, then there is little help I can provide. But since both are 32-bit apps, you should also test with 64-bit GraphStudio from the pack.

Thank you. I got it to play the audio.

Yes, the VOB file does play in the x64 GraphStudio.

Solution:
In ffdshow audio decoder configuration (x64) -- DirectShow control options

UNcheck the option for "Use ffdshow only in"

Aparently that was preventing .Net from getting access to this audio filter.

-------------------------------
However, I still can't get the file to play at all direct from the DVD disk. I have to copy the VOB file to my harddrive to get it to play. I assume the copy is a an exact bit for bit copy (file sizes are exactly the same). The only apparent difference is that the DVD file is marked ReadOnly.

That is the whitelist function of ffdshow, which is normally off by default.

The difference with playback directly from DVD might be that Microsoft´s source filter recognizes it as located in a DVD file structure, which may activate certain copyright protection checks. Test with a single vob file burned on a DVD to see if it still happens. The Codec Tweak Tool allows you to configure a different preferred splitter.

Yup, I think you are right -- Might be a Windows OS hook preventing the play on a DVD formatted disk. I wrote the file onto a rewriteable DVD formatted as a file system disk and my app plays it fine.

I tried both the LAV and Haali splitters. Both work fine with the VOB file on my harddrive, but will not play the file on the DVD disk.

Thanks for your help. Much appreciated. I'm gonna try one of the .Net forums. Maybe someone has cracked this issue before. If I find out anything interesting, I'll report it back here.