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Looping H.264 files slip after an hour

looping video looping video

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#1 Doug

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Posted 28 October 2015 - 11:50 PM

Just set up a new show for an 8 screen museum display.  Part of it is a 20 second video for each of the monitors.  Each video is on free run and loop.  I'm testing it on our show displays, which are i7 quad core boxes and AMD Firepro 7000/7900. The museum is outfitted with 4 Watchpax units and a rack mount production pc from Showsage. Have not tested it there yet.

The loop seems to play perfectly for well over an hour, maybe two hours.  then it starts to slip - the video is not going from the last frame of the video to the first frame of the video - all the displays exhibit this.  In addition, the videos get out of sync with each other, even on the same display computer. if I start the timeline over, when it gets to the loop, again, plays fine for an hour or so, then starts to get out of sync.



#2 Neil Stratton

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Posted 29 October 2015 - 10:25 AM

For long free running loops I always encode to Mpeg 2. Tried H264 but it always seemed to drift after a few hours.



#3 Doug

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Posted 29 October 2015 - 05:53 PM

yes, just tried that, replaced all the files with mpeg 2 versions.  They run great for 1 hour-ish, then they do not play from the end frame to the start frame, and get out of sync with each other.



#4 Walter

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Posted 29 October 2015 - 08:33 PM

Also, why free run for a museum setup like that? Could work with loop in timeline which will solve this also?
Apart from this, mpeg2 is the way to go.

#5 Doug

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Posted 29 October 2015 - 10:14 PM

And now I have put the 8 videos into a composition and set that to loop and free run.  The videos have been looping for 2 1/2 hours with no loss of sync.  However, now I'm getting the deadly black flash when I transition to the composition.



#6 Doug

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Posted 29 October 2015 - 11:15 PM

it's free run so that on a cue it can cleanly dissolve to another segment of the timeline.



#7 Neil Stratton

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Posted 30 October 2015 - 12:02 AM

If you are free running and looping a comp then the comp must be exactly the same duration as the clip. Otherwise you will get black.

I usually just copy and paste the time specs from the clip to the time specs of the comp

Neil



#8 Erik Rönnqvist

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Posted 02 November 2015 - 09:48 AM

Which version of Watchout are you using? I had some test running during the weekend, with looping and free running h264 videos, and it still plays in sync after 60 hours, using Watchout 6. If the problem persists, please contact [email protected], preferably with a minimal test case that shows the problem. 

 

/Erik 







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