If you delete parts of the audio track, it will no longer be the same length as the video, thus it will be out of sync. Either use a video editor and cut both video and audio or use an audio editor to select and mute (or lower the volume of) those parts of audio track that need adjusting. There are perhaps commercial programs which let you adjust the audio track from inside the video - but I am not familiar with them. If you wish to use freeware, AviDemux will extract the audio from the video. Audacity will adjust the audio and save as a new track - then use Avidemux to put the new audio back with the video.
Hi Thanks for reply... Unfortunately i had to cut also the video of those parts because the file is a capture from a minidv camera without compression and avidemux can't open those kind of files. thanks il capo
You need have an app which can help you clip the files. They allow you set the start point and the end point of the duration.
