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| Fredd |
| Posted: Sep 12 2002, 03:37 PM |
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Unregistered
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Hi everyone,
I often do VHS capture and try to improve the sound.
So I use the save wave feature but I feel like loosing time and space. If audio was stored in a wave file during the capture, it would be very handy.
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| Spire |
| Posted: Sep 12 2002, 08:09 PM |
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You know, I do the same thing as you, and you're right; the ability to save the audio into a separate .WAV file would be a nice time-saving feature. Perhaps I'll have a look at the VirtualDub source and see how difficult this would be to implement.
BTW, what audio editor do you use? Did you know that some editors, such as Cool Edit Pro, can load the audio stream directly from an .AVI file? What's more, Cool Edit Pro can even save the edited audio back into an .AVI file! |
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| Neo Neko |
| Posted: Sep 13 2002, 12:55 AM |
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VirtualdubMod Alpha tester
Group: Vdubmod Alpha Testing Team
Posts: 474
Member No.: 24
Joined: 11-July 02
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Pulling the audio outside the AVI can lead to synch problems. And it should only get worse if you do it while capturing video.
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| Spire |
 Posted: Sep 13 2002, 01:38 AM |
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Interesting point. Yet when I extract the audio from a just-captured .AVI file, then edit it, then use VirtualDub to interleave the cleaned-up audio back into a new .AVI file, I get no noticeable sync problems at all. I have been following this procedure for years. Have I just been lucky? |
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| Neo Neko |
| Posted: Sep 13 2002, 08:40 PM |
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VirtualdubMod Alpha tester
Group: Vdubmod Alpha Testing Team
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Under ideal conditions it is fine. I do it myself some times. But it can have adverse effects. So I make a point to check the output before I ditch the original. |
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| fccHandler |
| Posted: Sep 14 2002, 06:18 PM |
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Administrator n00b
Group: Moderators
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Maybe a helpful tip for you guys (requires AVISynth):
1) Create the simplest script possible: AVISource("CAPTURE.AVI")
2) Save it as CAPTURE.avs
3) Open CAPTURE.avs in VirtualDub
4) Choose "Save WAV" to rip the audio
From my experience, this is like 10 times faster than ripping the audio from the original AVI. Anyone else seen this? Anyone know why?
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May the FOURCC be with you... |
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| Fredd |
| Posted: Sep 14 2002, 06:38 PM |
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To Spire: I use Magix Audio Studio (say, a "Samplitude light"). AFAIR, I can load from and save back to the AVI as well.
I sometimes have sync problems so I look in the framerate, and check the option "change so video and audio..." if there is any difference. But I still export the wave file, and, with the option mentionned above, I don't have problems.
Another (little) benefit of separate video-audio recording: doing MPEG conversion then multiplexing. If you use Philips Video Toolkit, you see what I mean... I think it also help video editing software to deal with 2 separate files instead of seeking in a unique file. |
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| Neo Neko |
| Posted: Sep 14 2002, 10:16 PM |
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VirtualdubMod Alpha tester
Group: Vdubmod Alpha Testing Team
Posts: 474
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Joined: 11-July 02
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| QUOTE (fccHandler @ Sep 14 2002, 12:18 PM) | Maybe a helpful tip for you guys (requires AVISynth):
1) Create the simplest script possible: AVISource("CAPTURE.AVI")
2) Save it as CAPTURE.avs
3) Open CAPTURE.avs in VirtualDub
4) Choose "Save WAV" to rip the audio
From my experience, this is like 10 times faster than ripping the audio from the original AVI. Anyone else seen this? Anyone know why? |
My AVISynth does not do AVI audio. I can do audiodub(video-avi, audio-pcm) but your audio has to be extracted already.
| QUOTE (Fredd @ Sep 14 2002, 12:38 PM) |
I sometimes have sync problems so I look in the framerate, and check the option "change so video and audio..." if there is any difference. But I still export the wave file, and, with the option mentionned above, I don't have problems.
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That does not synch the audio though. Now instead of getting out of synch after a certain point it will now be slightly desynchronised through out the movie. You might find this acceptable. But I personally would not do so. If the audio in your AVI is asynchronous after capture then you have capture problems. If it is out of synch after extracting the audio and mixing it back in find a way not to do that. The feature has it's uses. But if you use it with any regularity you have problems or are doing something wrong.
I would be interested to hear phaeron's views on this though. He should know for sure after all.
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| fccHandler |
| Posted: Sep 15 2002, 04:36 AM |
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Administrator n00b
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| QUOTE (Neo Neko @ Sep 14 2002, 04:16 PM) | My AVISynth does not do AVI audio. I can do audiodub(video-avi, audio-pcm) but your audio has to be extracted already.
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 That is strange.
I don't think the original author of AVISynth (Ben Rudiak-Gould) has updated his web site in years, so I am currently using a more recent version of AVISynth (1.06 beta) by Edwin van Eggelen. I highly recommend it. You can get it here:
http://www.videotools.net/uk/download.php
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May the FOURCC be with you... |
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| bobsobol |
| Posted: Sep 17 2002, 08:14 PM |
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It's interesting to hear you guys descussing this issue. The capture program for my card (if not the documentation for the card it's self) a Hauppage WinTV jobbie whos exact description escapes me, I've had it too long, recomends that you never attempt to capture audio and video during the same session, as the quality of both will suffer.
This advise I tend to take, especialy if my source is a Stereo VHS tape as my player has a tendency to throw up a HI-FI logo each time it hits a speck of dust in the audio track on the tape. I capture video with the player in MONO mode, and change to stereo for the Audio capture.
This has lead to synch problems, though not usually with a progressive lag. I use a non-linear editor to match the video and audio tracks if the clip is long, or VDubs Audio Interleaving function to adjust Audio Skew.
I never found it ideal however, and it's nice to see others contradicting the authenticity of the supposedly official documentation I recieved.  |
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| Neo Neko |
| Posted: Sep 18 2002, 07:27 PM |
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VirtualdubMod Alpha tester
Group: Vdubmod Alpha Testing Team
Posts: 474
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Joined: 11-July 02
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| QUOTE (fccHandler @ Sep 14 2002, 10:36 PM) | | QUOTE (Neo Neko @ Sep 14 2002, 04:16 PM) | My AVISynth does not do AVI audio. I can do audiodub(video-avi, audio-pcm) but your audio has to be extracted already.
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That is strange.
I don't think the original author of AVISynth (Ben Rudiak-Gould) has updated his web site in years, so I am currently using a more recent version of AVISynth (1.06 beta) by Edwin van Eggelen. I highly recommend it. You can get it here:
http://www.videotools.net/uk/download.php |
I am using the same version. Actually I think there is a newer version as well. But if I give it an AVI with even PCM audio the audio never makes it to virtualdub or anywhere else cause no matter what I do Directshowsource, avisource, or opendmlsource it never gets the audio. |
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| fccHandler |
| Posted: Sep 18 2002, 07:41 PM |
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Administrator n00b
Group: Moderators
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| QUOTE (Neo Neko @ Sep 18 2002, 01:27 PM) | | But if I give it an AVI with even PCM audio the audio never makes it to virtualdub or anywhere else cause no matter what I do Directshowsource, avisource, or opendmlsource it never gets the audio. |
You totally should be able to get audio from AVISource(). Perhaps try uninstalling and then reinstalling AVISynth?
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May the FOURCC be with you... |
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