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| JedediahJ |
| Posted: Aug 20 2010, 05:52 AM |
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Newbie
Group: Members
Posts: 1
Member No.: 28319
Joined: 20-August 10
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Very weird thing here guys. I am taking a recording made from a video game capture tool called Fraps, placing it in VIrtualDub to compress it, and my audio is playing back in super slow-mo.
Filter: Resize 1280x720
Video Compressor: Xvid MPEG4 Codec
Audio Compressor: LAME MP3 4800hz, 160kbps CBR
I figured the best way to share the problem is to so you. Here is a link to a really short sample clip.
http://www.mediafire.com/?8cui26mlltle6ti
You'll notice the video is only a few seconds long, yet the audio continues to play out. |
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| -SPM-Mad |
| Posted: Aug 23 2010, 08:12 PM |
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Advanced Member
Group: Members
Posts: 197
Member No.: 1332
Joined: 13-December 02
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So generally, fraps is fast but still needs a fast hardware for capture at full res with 60fps. But I have no idea why it totally skrewed up the audio timing. The who audio was captured too slowly.
I do not know how to 'rescue' the file without (audio) recompression. With recompression, you can use VirtualDub to make the audio match the video again. If you go to video->framerate you have an option that says 'match audio' and VirtualDub in your case showing 15.010 fps to archive this. Keep the FPS at the original 60fps. The video was captured in 60fps, so the audio needs to be (60 / 15.01) times faster or stretched by the factor of (15.01 / 60) = 0,25017. If you enable audio processing and advance filtering, you can add 'input', 'stretch' and 'output'. Configure stretch by doubleclicking and set it to 0,25017.
Ofcourse you also need to select a new compression codec for the audio trac. But you can use direct-stream-copy for the video. Then your video is fixed agian.
Greetings
-SPM-Draget |
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