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| fvisagie |
| Posted: Aug 27 2009, 03:03 PM |
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Advanced Member
Group: Members
Posts: 35
Member No.: 26033
Joined: 19-August 09
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Hi All,
Here and there my rendered DV AVI contains annoying 1-frame audio gaps on clip boundaries, caused by the editor. Currently I'm stepping through the movie looking for these and fixing them up.
Without going into the details, for this particular project analysing either DATECODEs or timecodes isn't a failsafe way of detecting clip boundaries. So I'm using VirtualDub's scene detection to help get to clip boundaries quicker, and then I look for gaps in the audio waveform there.
However, it occurred to me that - the primary objective being identifying audio gaps - perhaps there's some tool that could do that directly. I've had a look at the filter listings but saw nothing that directly fitted the bill.
Do you know of any VirtualDub-based tool that can locate audio gaps?
Many thanks,
Francois |
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| fvisagie |
| Posted: Aug 28 2009, 02:55 PM |
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Advanced Member
Group: Members
Posts: 35
Member No.: 26033
Joined: 19-August 09
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In case there's another lost soul looking for a solution to this problem like me, I ended up with an alternative approach which in hindsight I much prefer. It works for timecoded DV video files. (The footage without timecodes in this project I just did manually).
Here are the steps:
1. Use the Avisynth-based utility at http://forum.doom9.org/showthread.php?p=13...470#post1317470 to generate an ASS subtitle format scene file for your video
2. In Aegisub, open the subtitle scene file, open the video and click the toggle button to enable auto-scroll of video, open its audio and set the waveform display to amplitude (i.e. not spectrum mode)
3. In VirtualDub, open the subtitle scene file (with VSFilter's TextSub - http://sourceforge.net/projects/guliverkli2/files), open the video and turn on audio waveform display. The subtitles and audio waveform aren't necessary here but simplify accurate navigation and cross-referencing.
4. In Aegisub, step through the scenes by moving from subtitle to subtitle, and at each check the audio waveform for any gap
5. For any gaps you identify, in VirtualDub navigate to the same frame and delete it 
That's it, enjoy!
Kind regards,
Francois |
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| Astuur |
| Posted: Nov 10 2012, 10:27 AM |
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Newbie
Group: Members
Posts: 3
Member No.: 24462
Joined: 2-November 08
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Thanks for coming back and giving that solution!
In fact I also have a similar task. I need to cut some Avis according to the audio.
Your method works, but it's far from comfortable.
It took me a while to discover the View | Audio Display Option in VirtualDub.
But I found it very useful for these kind of jobs. |
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| -vdub- |
| Posted: Nov 15 2012, 03:19 AM |
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Advanced Member
Group: Members
Posts: 613
Member No.: 27087
Joined: 24-February 10
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Didn't realise fvisagie came back to edit his post (Posted on Aug 28 2009, 02:55 PM)
Cool Edit Pro.
A search of its help file for silence, shows some options to do this. |
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