Hi,

I use an M-Audio Transit USB. When watching video with PowerDVD, Media Player or VLC, audio and video are perfectly in sync. But with QuickTime, the audio always comes too early.

My Settings:
Quicktime Preferences - Delay of the Audio Device: 1ms (situation gets worse when I increase the value, and 1ms is the minimum)
M-Audio Transit: 24-bit, 8000Hz to 48000Hz, Latency: Very Low

Does someone have an idea how to fix this?

Yours,
LTR

there are other ways to play quicktime offline, like mpui, media player classic (with proper filters), vlc.

(i know that wasn't what you wanted to hear.)

Nevertheless, thanks for your reply. In VLC, the lag is gone, but the image and audio quality is lower than in QuickTime.

for audio quality you have to refer to rule #8 of this forum;
http://www.hydrogenaudio.org/forums/index.php?showtopic=3974

for video quality, maybe you could post some screenshots?

The Transit USB can't record what it's currently playing, so I can't put the output of QuickTime into a WAV file and I'm therefore unable to do an ABX test.

Regarding video quality, here you are:

QuickTime and VLC, same zoom level.

interesting, what video codec is it? (if AVC then check that all post processing is turned off)

Quicktime reports H.264 for video, and the audio codec is AAC.
VLC reports avc1 for video, and mp4a for audio (which is just another term for AAC, i guess).

Postprocessing in VLC is deactivated, but the video output module was set to DirectX 3D. I changed it to DirectX, and now QuickTime and VLC look the same.

edit:
And in VLC, the output sample rate was set to 48000, while the video has 44100Hz sound. I fixed this, and now I can't tell a difference between VLC and QuickTime.

Alright, I'll use VLC in the future. Thanx!