Screen Capture

[nirbhayn]

Hi
One of .avi file has a serious a/v sync problem. the audio is 48.36 min long and video is 51.55 min long. Now i found out this when i split the audio from video using virtual dub. I hear this is a process which can be only corrected by trial and error.

SO i thought maybe i should do a screen capture of the movie because the original movie plays fine but when converted to dvd it gets rough.

So which is the best screencapture program which will capture my audio plus video?.

[laspis59]

I've only done this once.I captured about 30 minutes of video from a software video player with CapturePad.In its options I set Hardware acceleration to "Disable all DirectDraw and Direct3D accelerations,as well as all cursor and advanced drawing accelerations" and it worked giving 100% sync.The codec I used to capture with was huffyuv.

[nirbhayn]

Only Problem is the audio. as my avi file is playing i can only record from mike aye?.

[Bjs]

Zd soft recorder as well , convert captured avi's using super

For problem's recording audio , I use an iriver mp3 recording device for all my desktop recording guide's to take the pressure off the pc .

Audiocity to slice audio to a specific time length (imported to pc from iriver device first)
The ramaining splicing of video and realignment with new audio is done in vdub .

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Then you run into other audio issue's ... audio fall's behind the further it play's , audio drift's forward gradually (unusual)

Audio that remain's the same amount , either behind or forward can be simply corrected using audio scew in vdub ... The other , take's patient's ... stretching audio in place's that dont matter , and resyncing to character's .

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Another trick that can work ... for indifference's between time length's between video and audio .

1: Strip current audio as wav via the "full processing" method in vdub

2: Find a framerate that will speed up video to same time as current audio , and do a reclock on the video in vdub .

3: Now add "wav" under audio ... that previously extracted one .

4: Now rewrite the frame rate to previous value using the reclock method .

See how it gose , if this last one appear's to screw thing's up , then I would consider using super to do the framerate conversion ... it should be fine .

This will not work if audio is currently in sync with video ... if audio time line is short ... then this part is actually missing .

I'll have a crack at this one ... just something that I have been thinking of for a while ... so I'll test my theory on this later.

[laspis59]

Zd soft recorder as well

I have FRAPS for recording games but found that it didn't always "record screen of 3D hardware accelerated non-game applications" It was picky with some software video players as I remember so I resorted to Capture Pad instead.

I'll have to check that one out myself.

[nirbhayn]

Bjs

Can simpify your reclock methord plze.
I dont know how to use it.

[Bjs]

Before I can simplify what is required ... knowing the frame rate would be of help ...

But once more :

Audio is extracted via "full processing" method in vdub .

Dealing with video :

Open video in vdub , then hold CTRL , then hit R ... Source rate adjustment (enter required framerate) , then hit ok ... video to "direct stream copy" ... save as avi .

If video is shorter than audio , reclock video to lower fps will allow time length's to be matched (stretched fps method) .

If video is longer , it is reclocked to a higher fps to allow both time lenght's to match (shrinked fps method) .

Once correct video frame rate is found ... can take a couple of gose to get this right for newbies ... the extracted audio is re-added back as "wav" under audio tab .

Finally , set video to "direct stream copy" , audio to "full processing" ... audio compression can also be applied ... ac3 , mp3 , ect .... save as avi .

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This can now be converted to required frame rate for other project's ... super or ffmpeg may beable to do this ... though they can be in error ... this is why I have ulead video studio to do my fps conversion's .

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Of course this is not intended for video's in complete sync ...

In these case's , it would appear as part of the audio is actually missing ... if this is unavailable from another source file ... then you may want to add "null" audio to fill this void , which would prevent conversion program's from stuffing the syncronization between the video and audio component's ...

Use goldwave or audiocity to add the extra audio segment .

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A final method with matching audio with gradual sync issue , require's multiple pass's in vdub using the "audio scew" feature , and saving "frame x to frame y" and using eventually the "append" feature to rejoin the whole project once done ... it tend's to have less impact on audio , unlike other method's .

This require's a reasonably good pc for "preview" mode ... good eyesight , and hearing ...

Of course this is a last resort ... you can go nutt's ... esspecially if you make a goofup somewhere along the line during the entire process .