Silent TV for channels with non-ac3 audio - is my config bad? / Reinstall fixed issue (1 Viewer)


Portal Member
March 10, 2009
Home Country
Sweden Sweden
Hi, I have used MediaPortal for some months now. I love it, great software! However, I have a problem and I hope someone can help me.

I can't manage to get audio through to my speakers when watching TV channels with non-ac3 audio using MediaPortal (live or recorded). I have tried different codecs, but the result is always silence. I have looked at recorded .ts-files with TsPacketChecker and it seems my problem occurs when audio is pid: 0x40 [Audio MPEG-1] (ISO/IEC 11172-3 Audio) or pid: 0x40 [Audio MPEG-2] (ISO/IEC 13818-3 Audio)

I have no idea on how to proceed. Have you noticed the same behavior? Am I missing something in my setup? When I render a 'silent' recording on the same PC using GraphStudio and the same filters as MediaPortal I get audio so I assume TVServer is doing it's job just fine (that's why I'm posting this in the MediaPortal section). However, I'm far from an expert when it comes to these things so I could very well have messed things up.

Below are some details from my testing. I attached logs and screenshots as well.
First I recorded some seconds from one of my 'problem channels'. TsPacketChecker reports MPEG-2 audio.

Then I watched the recording from MediaPortal. Video was fine, but I got no audio.

Finally, I created the same graph (at least they look the same to me) using GraphStudio and rendered the recording from there. This time I got audio. There is a difference in filter properites (ALLOCATOR_PROPERITES). I have no clue to if this is important or not.

TV-Server Version:
MediaPortal Version:
MediaPortal Skin: Blue3wide
Windows Version: Vista Home Premium SP1 32-bit Swedish
CPU Type: AMD Athlon64 X2 4850e 2.5Ghz
HDD: 160GB Samsung 2.5" HM160HI SATA
Memory: 2GB (2x1024MB) DDR2 PC6400 CorsairXMS2
Motherboard: Gigabyte GA-MA78GM-S2H 780G, AM2+ mATX (rev 1.1)
Video Card: (motherboard)
Video Card Driver: Catalyst 9.4
Sound Card: (motherboard)
Sound Card AC3: optical out
Sound Card Driver: Realtek HD Audio
1. TV Card: Digital Everywhere FireDTV
1. TV Card Type: DVB-C
1. TV Card Driver: 45n 20071203
2. TV Card:
2. TV Card Type:
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec: CyberLink Video/SP Decoder (PDVD9)
MPEG2 Audio Codec: ffdshow Audio Decoder
h.264 Video Codec: MPC - Video decoder
Satelite/CableTV Provider: Gothnet
HTPC Case: Antec Fusion Black 430W mATX
Power Supply:
TV: Samsung PS50Q91H (50" plasma, not FullHD)
TV - HTPC Connection: HDMI


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  • GraphStudio_graph.jpg
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  • GraphStudio_graph_tsreader.jpg
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Paranoid Delusion

Moderation Manager
  • Premium Supporter
  • June 13, 2005
    Home Country
    United Kingdom United Kingdom
    FFDShow audio config\codecs MP1\MP2 change codec to libavcodec, if not a choice then mp3lib, now see if you get sound, this is caused by dual mono audio transmissions.

    HTH, if not let us know and will come up with another idea, can you check you have no filter errors with filmerit (link in sig)


    Portal Member
    March 10, 2009
    Home Country
    Sweden Sweden
    Thanks for replying.

    MP1/2 codec is already set to libavcodec and filmerit reports 0 error among 206 filters so it looks fine.

    I use ffdshow tryout rev 2871

    Any other idea?


    Portal Member
    March 10, 2009
    Home Country
    Sweden Sweden
    Cured by system reinstall

    Great things, those reinstalls. I eventually formated my system and reinstalled Vista + MP. All is just fine now and I get sound from all TV channels using just the built-in MP-decoders.

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