CSY Posted July 18, 2011 Report Share Posted July 18, 2011 (edited) Hi there, yesterday I had a disaster when playing a WMV video where the sound (embedded to the video) was constantly lagging forced the dancing performance to terminate. Currently I am using a good setup for watchout 4.2.2 (i7 processor, 4gb ram, ATI6870) with external USB sound cards, but with Windows XP OS, So my questions is what possible external factors could affect the sound lagging, it has been tested a few times during rehearsal and on first 2days of the event. Thanks in advance p.s. sorry if my English is bad as it is not my first language. Thanks *edit: forgot to mention about the motherboard, not sure what model was it but is Asus republic of gaming series. *edit2: could it be because of the codec used doesn't compatible with windows XP, the codec used was Windows media video 9 professional and Windows media audio 9.1 but I updated WMV constantly. Edited July 18, 2011 by CSY 0 Quote Link to comment Share on other sites More sharing options...
Daniel Quinn Posted July 19, 2011 Report Share Posted July 19, 2011 I have seen audio lag on WMV files before for, and we recently had an experience where the audio lagged for a very specific reason. The first one I had audio embedded on the first display only, and that machine lagged slightly processing audio when the other 3 displays didn't have to. Lesson learnt from that experience was if it is possible to extract the audio and play it separately, do so! If you are using USB audio devices, I would imagine this problem would be exasperated. The second time was a bit interesting. The team who built the show had the audio running off the production machine, and the pause point was .010 off the start of the video. About 1/3 of the time (and we tested this for 2 days to get this average) the timeline would Pause, but because the "green line" on the timeline was so close to the video it would actually trigger the video file on the display machine. Because they received the files so late, they had added them on the timeline and set them to Freerunning, so when the pause point triggered the video, it started running until the operator hit the go again to fade the opacity of the video up. This triggered the video as far as the production machine was concerned, but was obviously 15-20 seconds behind the video footage. Not sure if the second example is what happened to you, but be wary of having pause points that close to free running video files. Interestingly, if I zoomed closer in on the timeline, and made a visible space between the green bar and the video file, the fault never occurred. Dan 0 Quote Link to comment Share on other sites More sharing options...
CSY Posted July 20, 2011 Author Report Share Posted July 20, 2011 Thanks for the reply, the USB soundcard was attached to the display computer, so the first reason would be more valid, after some testing done, it was actually the video's file fault as it keep lagging on the same spot, but it was undetectable on my laptop, secondly the video was fine for first 3 days and the problem occurred on the forth day, I would imagine if the video has problem would be noticed straigh away from day 1. 0 Quote Link to comment Share on other sites More sharing options...
Daniel Quinn Posted July 20, 2011 Report Share Posted July 20, 2011 Always good to find the reason. I hate intermittent faults! 0 Quote Link to comment Share on other sites More sharing options...
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