changing audio to a video

[air0s]

Hello I would like to thank you for the board ...
I'm having difficulties with a mkv video where the original has an english audio....
I want to change the audio with my native language...
so Usa usually uses 23 fbs - italain 25
So I thought to convert the italian audio to 23, but I can't syncronize because at the beginning the english audio file is longer... I mean before starting talking there are more minutes without speaches.... so even crop the italian file doesn't solve...
so I need to change even the video files??? whant can I do..
I'm a bit confused if It is better to convert the audio files or as someones does to convert the video ... dunno
thank you in advance...

[pandy]

Ignore fps, check length (time) for audio - both must be the same.
If they are not equal you need to understand why - what can be reason for this.
It can be different movie version (some scenes cut or added) or it can be some additional processing.

[awgie]

FPS is usually only relevant for audio for the muxing process. If you are changing the video to 25fps, then you would also change the audio as well, but most editors/converters will do that automatically. If you are only playing the video as a file, rather than converting it to a DVD, there should be no need to change the frame rate, since computers and media players will play most any frame rates just fine.

Yes, as pandy said, the audio or video may be a different length because of scenes added or deleted. I have even found some DVD audio that is missing pieces. Where there was a silence in the movie, the producers actually cut out part of the audio track, just to make it difficult to make a copy. It played just fine in a DVD player, but when I converted it to a media file, I had to open the audio track in an editor and insert one second segments of silence at several points in the file.

Equally important - if not more so - than the actual length of the audio segment compared to the video segment is whether they play at the same speed. You can get the beginning of the audio synchronised with the video by changing the delay of the audio file (delay can be positive or negative), but if the audio plays at a different speed, then it will be out of sync by the end of the video. If that is the case, you would need to speed up or slow down the audio in an editor.

[air0s]

yeah should be diffent versions, it is a tv serie...
I checked out the lenght ... zoom in several times to understand that the original language audio is longer at the beginning before starting the conversation and the scenario ... the silent times before starting videos...
so I think it is the same for the video... In this case I don't know what to do, because i don't have this space with the Italian audio... so I thought changing the video fps to the original woud also have solved the initial problem...
or need I to cut the video ? I'm using audiacity for video and mkvtoolnik ...

Ignore fps, check length (time) for audio - both must be the same.
If they are not equal you need to understand why - what can be reason for this.
It can be different movie version (some scenes cut or added) or it can be some additional processing.

[air0s]

THANK YOU VERY MUCH ALL OF YOU FOR THE SUPPORT...
If I change the delay of the audio, I doubt I will solve... because even the video is not syncronized ... I need to cut even the video...
basically I have a better quality video with the original version that it is In English but I want to listen with my native language...
the problem is that the Italian audio is shorter at the beginning... so dunno what to do
I'm using mkvtoolnik and audacity

FPS is usually only relevant for audio for the muxing process. If you are changing the video to 25fps, then you would also change the audio as well, but most editors/converters will do that automatically. If you are only playing the video as a file, rather than converting it to a DVD, there should be no need to change the frame rate, since computers and media players will play most any frame rates just fine.

Yes, as pandy said, the audio or video may be a different length because of scenes added or deleted. I have even found some DVD audio that is missing pieces. Where there was a silence in the movie, the producers actually cut out part of the audio track, just to make it difficult to make a copy. It played just fine in a DVD player, but when I converted it to a media file, I had to open the audio track in an editor and insert one second segments of silence at several points in the file.

Equally important - if not more so - than the actual length of the audio segment compared to the video segment is whether they play at the same speed. You can get the beginning of the audio synchronised with the video by changing the delay of the audio file (delay can be positive or negative), but if the audio plays at a different speed, then it will be out of sync by the end of the video. If that is the case, you would need to speed up or slow down the audio in an editor.