2012-02-21, 03:04 PM
The trouble is I find it very difficult to tell if any of the video processing is being off loaded onto the GPU. Its also very difficult to find out what the various DXVA functions DXVA Checker lists mean and if they are of use to you. Can anyone point me in the direction of some useful DXVA documentation?
So far I have found useful snippets from various tutorials so know if the words âH264_VLDâ appear then it will decode H264 video. On the computer with the GeForce210 card it defaults to using ffdshow video decoder to play H264 video, but that decoder does not support DXVA. The next snippet I found was to âDisable H264 in the ffdshow video decoderâ. Using âffdshow video decoderâ to play a H264 recording on my five year old 3Ghz P4 computer the processor runs between 50% and 90% capacity. For H264 recordings it now defaults to using the âffdshow DXVA video decoderâ the processor runs at around 5%. However neither the Cyberlink or LAV video decoders seem to use DXVA as both run the processor at around 60% if its enabled or not.
On the two computers with DXVA supporting chipsets neither showed any evidence of using video acceleration even though the AMD 760G listed H264 among its functions. Most of my recordings at the moment are SD MPEG2 664 X 544 so it does not matter that acceleration is not supported as the processor runs at around 10% to 20%. Graphstudio was very useful for monitoring which decoders NextPVR is actually using and also to test render a file and try different decoders. I was surprised how often some decoder combination failed.
So far I have found useful snippets from various tutorials so know if the words âH264_VLDâ appear then it will decode H264 video. On the computer with the GeForce210 card it defaults to using ffdshow video decoder to play H264 video, but that decoder does not support DXVA. The next snippet I found was to âDisable H264 in the ffdshow video decoderâ. Using âffdshow video decoderâ to play a H264 recording on my five year old 3Ghz P4 computer the processor runs between 50% and 90% capacity. For H264 recordings it now defaults to using the âffdshow DXVA video decoderâ the processor runs at around 5%. However neither the Cyberlink or LAV video decoders seem to use DXVA as both run the processor at around 60% if its enabled or not.
On the two computers with DXVA supporting chipsets neither showed any evidence of using video acceleration even though the AMD 760G listed H264 among its functions. Most of my recordings at the moment are SD MPEG2 664 X 544 so it does not matter that acceleration is not supported as the processor runs at around 10% to 20%. Graphstudio was very useful for monitoring which decoders NextPVR is actually using and also to test render a file and try different decoders. I was surprised how often some decoder combination failed.