Hauppauge WinTV DMB-T released in Hong Kong

[sub]

Thanks for the info.

There is a few more limitations with H.264 channels than MPEG2 channels, but I'm guessing it would probably be working fine if he had the Cyberlink H.264 decoder installed. Our standard here is pretty much the same, but we use AAC audio. GB-PVR also works with AC3 audio.

[jksmurf]

Welcome.

It seems the s/w "encoders" (I guess they are not really true encoders if the stream is already H264?) will work, but presumably it still holds true that a Hardware implementation (do these exist, probably not for DMB-TH yet?) will perform the work with lower CPU requirements.

k.

[sub]

The digital stream is recorded pretty much straight to disk, and encoded by the broadcaster prior to transmission, so there is no need to worry about hardware encoders etc.

It can take quite a grunty PC to playback highdef recordings though. Much more so than with MPEG2 files.

[jksmurf]

Cool, that is excellent news for me!

The H264 digital stream (and also MPEG2 stream presumably) can go direct to disk ... and my POPCORN Hour can play it back :-).

k.

[Pahtz]

So here is the state of play for me...

The Hong Kong digital only channels use MPEG-4/AVC(H.264) which gives me scrambled video.

The channels that are simulcast in analog are MPEG-2 which I can see okay.

I played with GraphEdit for the first time. When I record the H.264 streams and play them back, by default they look just as scrambled using the ffdshow decoder.

If I edit the graph to use the Mainconcept decoder then it looks fine. So it seems the mainconcept decoder is able to produce proper output under certain conditions. Arcsoft TotalMedia is able to play the h.264, and is possibly the app that installed the Mainconcept decoder.

(BTW, anyway to get GOM player, WMP etc. to use the Mainconcept decoder instead of ffdshow?)

I have attached the graphs for the default(ffdshow), mainconcept, and Live TV playback.

At the moment I'm using a 2.6GHz P4, with AGP 8X, ATI Radeon 9200 128MB. So the graphics card is not capable of using Cyberlink's decoder (X1300 or better required).

Hauppauge recommends P4 2.5GHz, 1024MB RAM, and a video card with 256MB video memory for HDTV. HDTV is choppy on my system. Maybe an video card upgrade is imminent but I think there is still a chance to get the Mainconcept decoder to work.

[whurlston]

I think you can set the prefered decoder used by GB-PVR by editing the <PreferredH264VideoDecoder> tag in the config.xml

You can try adding the MainConcept decoder in <SupportedH264Decoders> then setting it to prefered. It may or may not work. I've had success with some MPEG-2 decoders like that.

[sub]

Sorry, H.264 stuff is still very new, and decoders arent as interchangeable as they are with MPEG2 decoder. GB-PVR specifically setup stuff to work with the Cyberlink H.264 decoder. Other decoders probably wont fare as well.

Its possible I'll add support for the Mainconcept and CoreAVC decoders in the future, but that'll have to wait until I have time to test with them. For now the Cyberlink H.264 decoder is it.

[whurlston]

My mistake. In my defense, I did say "It may or may not work."

[roadster]

Hi everyone,

I'm new to this forum.

I just purchased the WinTV DMB-T USB in Hong Kong, and I think there's something wrong with it.

Sometimes, I'll say around 70% of the time, the DMB-T works fine. However, the other 30%, I will turn on TotalMedia to watch TV and I will get absolutely no signal for all channels.

I've tried reopening TotalMedia, Logging Off, enabling and disabling hardware acceleration, etc.

The only way I've found is to restart the PC and pray the signal comes back which usually it does. I've updated to the newest patches on TotalMedia and on my nVidia drivers. I am using Windows Vista Home Premium 32-bit.

I don't know if my DMB-T is faulty or the antenna in my building just isn't good enough?

Has anyone encountered this same situation?

Thanks!

My specs below:
Dell XPS 720
Core 2 Quad@2.4GHz
2GB RAM@800MHz
8800GT SLi
3007FPW-HC

[sub]

I doubt there is many people here that can help you with your TotalMedia software.

Does it do the same thing in GB-PVR?