Changing Frame rate...?!

[SB4]

Hello,

Ok, first of all i have to video files the 1st have 25 fps and the 2nd have 23.976. I want to merge the audio from the 1st video file with the video from the 2nd video file. How ?!

What happen if i simply change the frame rate of the 2nd video file to 25 fps...?!

Regards,
SB4

[AlanHK]

Using what tools?

Easy enough to do in Avisynth, for instance.

[SB4]

I'm using Adobe Premiere to do merge with some edit...

[SB4]

Using what tools?

Easy enough to do in Avisynth, for instance.

Can you tell me which plug-in can do that. please ?!


Ok, What if i want to modify the audio from 1st video to match the video frame rate 23.976 of 2nd video. How to do that...?!

[AlanHK]

Using what tools?

Easy enough to do in Avisynth, for instance.

Can you tell me which plug-in can do that. please ?!

To convert 23.976 fps to 25:

AssumeFPS(25, sync_audio=true)

vice-versa:

AssumeFPS("ntsc_film", sync_audio=true)

Ok, What if i want to modify the audio from 1st video to match the video frame rate 23.976 of 2nd video. How to do that...?!

Assuming that they are exactly the same, except for FPS, you could do:

AVISource("vidNTSC.avi")
AudioDub(AVISource("vidPAL.avi").AssumeFPS("ntsc_film", sync_audio=true))

You can use DelayAudio() to shift audio a constant number of seconds to sync if necessary.

But if it doesn't match then maybe use an audio editor like Audacity and load the original and new tracks and adjust the new to sync visually, then delete the old track and save the adjusted new one.

[SB4]

Thanks AlanHK. Can you teach me how to use Audacity. please ?!

[SB4]

To convert 23.976 fps to 25:

AssumeFPS(25, sync_audio=true)

Ok, When i used this method the video frame rate set to 25 fps with 29 minutes but When i convert the same video to 25 fps using VirtualDub it have 27 minutes. Why is that ?!

[AlanHK]

Thanks AlanHK. Can you teach me how to use Audacity. please ?!

RTFM: http://manual.audacityteam.org/man/Quick_Help

To convert 23.976 fps to 25:

AssumeFPS(25, sync_audio=true)

Ok, When i used this method the video frame rate set to 25 fps with 29 minutes but When i convert the same video to 25 fps using VirtualDub it have 27 minutes. Why is that ?!

I guess it's using a different method, perhaps interpolating or duping frames to keep the original duration.
Look at the total number of frames.
Using AssumeFPS, the number of frames is unchanged, but if frames have been added there will be more, you may see one dupe per second.

You can use different methods in Avisynth too. See http://avisynth.org/mediawiki/FPS
ChangeFPS will keep the same duration by adding or deleting frames.

[SB4]

Thanks AlanHK