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730 posts

Ultimate Geek
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  Reply # 141067 28-Jun-2008 17:46
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I am now confident recording DVB-T MPEG4 on a relatively low spec PC eg my P4 2.4


A further update and caution advisory

I currently record analogue SD as MPEG4 as it send my P4 2.4 CPU to 80-100% CPU depending which codec I use. The M$ MPEG-4 codec definately uses less CPU than the DivX or XviD MPEG-4 codecs [the later 2 send the PC to 100%]

Now I suspect that there is extra overhead in converting analogue to MPEG-4 as opposed to recording a DVB-T H.264 signal but until I get my DVB-T adapter I cannot confirm but I note that Haupaggue and Avermedia state a minimum of a Pentium 2.4 for recording DVB-T BUT as MPEG2. I'm not sure if the CPU for recording DVB-T as MPEG4 [H.264] will be more than with MPEG2 since the signal is already digital and unlike Anlogue does not require intensive CPU to covert to Digital and then compress.

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  Reply # 142065 1-Jul-2008 22:43
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argo: Thinking a little laterally, I wonder what CPU you could get away with in a GBPVR Server/Popcornhour configuration?

The Popcorn would be doing all the decoding (I'm assuming the the data is streamed in its "raw" state), so very little processing would fall back onto the Server.

Just a thought Laughing


That is exactly what I have done. I installed a HVR-900H USB2 DVB-T tuner on my PVR which is a Sempron 64 3000. It happily recorded a HD show from TV3 while I was watching another show off the same drive on my Popcorn Hour (shared over SMB).

When the recording was completed I tried to view on the PVR. No way - picture was jerky, pixellated and just unwatchable. OTOH played fine on the PCH with DD 5.1 audio. I suspect if I installed an video card with hardware acceleration (I do have a Sapphire 2600XT waiting to be installed) it would playback on the PVR but there is urgency now given I can play the recordings back fine on the PCH.




System One: Popcorn Hour A200,  PS3 SuperSlim, NPVR running on Gigabyte Brix, Sony BDP-S390 BD player, Logitech Revue, Pioneer AVR, Panasonic 60" 3D plasma

System Two: Popcorn Hour A200 ,  Oppo BDP-80 BluRay Player with hardware mode to be region free, Vivitek HD1080P 1080P DLP projector with 100" screen. Harman Kardon HK AVR 254 7.1 receiver, Toshiba HD-A2 HD-DVD player, Samsung 4K player

 


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