- Thread starter
- #151
Re: AW: MediaPortal Audio renderer - better video playback quality
Looks like the audio indeed is drifting away. At the end the samples are already arriving 9+ seconds earlier than the current presentation time is (it is normal that the samples are a bit less than 1 second early since if they would arrive just in the time they would be rendered always late).
I think what happens is that the media speedup is not working. Since the display is 50Hz and source material's fps is 23.976 the bias shouldn't be 1.0.
Could you upload one small sample of such file that I could check why the EVR presenter is failing to calculate the correct bias value. Also please check if the A/V sync issue is present on 25 fps material on 50 Hz.
@tourettes
I can reproduce the issue with the muted sound also on my second test system (Phenom II-955 with Radeon 5770). In this case I am using the onboard audio with VIA HD soundchip. I can also switch to the ATI HDMI sound device if it is necessary.
The attached picture was captured nearly at the end of the videofile were the sound was already muted for a few seconds. The video file is an MKV with 1080P 23.97 fps (DXVA on) and uncompressed PCM sound.
I also enabled the new Sample timing log modus. The 13 dropped frames you'll see in the picture were dropped at the beginning of the video file (normal behaviour with DXVA-enabled videos).
Looks like the audio indeed is drifting away. At the end the samples are already arriving 9+ seconds earlier than the current presentation time is (it is normal that the samples are a bit less than 1 second early since if they would arrive just in the time they would be rendered always late).
24-07-2010 15:26:52.528 [ 228] rtTime: 81345.752 ms rtSampleTime: 90968.750 ms diff -9622.998 ms
24-07-2010 15:26:52.528 [ 228] rtTime: 81345.752 ms rtSampleTime: 91000.000 ms diff -9654.248 ms
I think what happens is that the media speedup is not working. Since the display is 50Hz and source material's fps is 23.976 the bias shouldn't be 1.0.
Could you upload one small sample of such file that I could check why the EVR presenter is failing to calculate the correct bias value. Also please check if the A/V sync issue is present on 25 fps material on 50 Hz.