MP4 video skips first 5 seconds in vMix Options  Watch this topic  Print this topic » Normal Threaded

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wilcoxk		#1 Posted : Wednesday, September 20, 2017 11:18:28 AM(UTC)
Rank: Newbie Groups: Registered Joined: 6/27/2017(UTC) Posts: 9 Location: USA		As stated in the title, we have a video added as an input. When we switch to that input, it skips the first 5 seconds and the continues playing the rest. Any ideas? I see there are in and out points and I have reset these.
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kjones9999		#2 Posted : Wednesday, September 20, 2017 8:47:30 PM(UTC)
Rank: Advanced Member Groups: Registered Joined: 8/20/2014(UTC) Posts: 388 Thanks: 29 times Was thanked: 80 time(s) in 51 post(s)		Could be a corrupted header. I would convert to mpeg2 and see if it is still there....
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raugert		#3 Posted : Wednesday, September 20, 2017 9:38:50 PM(UTC)
Rank: Advanced Member Groups: Registered Joined: 8/5/2017(UTC) Posts: 569 Location: Manitoba Thanks: 115 times Was thanked: 313 time(s) in 178 post(s)		I have the same issue using an external drive on USB3. I always attributed that problem to being an external source. Are you using one by any chance ?
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stigaard		#4 Posted : Thursday, September 21, 2017 1:23:52 AM(UTC)
Rank: Advanced Member Groups: Registered Joined: 5/20/2015(UTC) Posts: 493 Location: Copenhagen, Denmark Thanks: 389 times Was thanked: 100 time(s) in 79 post(s)		I actually saw similar problem once, but I can't remember if the video file were located on a external drive.. Have you guys verified that the solution were simply to put it to a local drive?
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DWAM		#5 Posted : Thursday, September 21, 2017 4:30:35 AM(UTC)
Rank: Advanced Member Groups: Registered Joined: 3/20/2014(UTC) Posts: 2,721 Location: Bordeaux, France Thanks: 243 times Was thanked: 794 time(s) in 589 post(s)		I guess it's incorrect keyframe in this video. Try re-indexing it and make sure you have keyframes every 2 seconds for example and especially one on the very first frame. Guillaume
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1 user thanked DWAM for this useful post.		stigaard on 9/21/2017(UTC)
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wilcoxk		#6 Posted : Thursday, September 21, 2017 8:51:49 AM(UTC)
Rank: Newbie Groups: Registered Joined: 6/27/2017(UTC) Posts: 9 Location: USA		Oh, You know what? The video might have been on a USB flash drive. I'll check that. Not sure what keyframes are but I suspect if I Google it, I'll find something. And the idea of converting to MPEG2...... I guess I would use handbrake for that?....
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wilcoxk		#7 Posted : Thursday, September 21, 2017 9:29:44 AM(UTC)
Rank: Newbie Groups: Registered Joined: 6/27/2017(UTC) Posts: 9 Location: USA		I moved the video to the local disk. The first time I played it back, it worked, but each time after that it still skips about 5 seconds. I converted to mpeg-2, but it looks like that reduced the quality. I haven't gotten to test if the issue persists with mpeg-2.
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wilcoxk		#8 Posted : Thursday, September 21, 2017 12:28:17 PM(UTC)
Rank: Newbie Groups: Registered Joined: 6/27/2017(UTC) Posts: 9 Location: USA		Even with Mpeg-2 it seems to have a problem. I removed .mp4 from the list of formats that playback with FFMPEG and that fixed it. Any ideas on why this would be the case?
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