Audio Sync, view waveform?
Posted: Thu May 15, 2014 3:02 am
Hi,
I was wondering if anybody knows a way of viewing the audio waveform of a video file (with a timeline)
Whenever I use mediacoder to compress videos to MP4, LC-AAC, X.264 there is usually a audio delay of between -50 & -350ms. At the moment I encode the first few minutes then watch the video in VLC and alter the delay until it sounds right and then encode the whole file using the same delay. This is a bit hit & miss and quite difficult if there isn't a clear sound to sync with, like a door closing.
This got me thinking that if I could view the audio waveform of the before and after video it would be easy to see the delay. Is there a free program to that can do this?
I guess I am making an assumption that it is the audio that is out of sync with the actual timeline, if the video is out of sync with the timeline this wont help.
Thanks.
I was wondering if anybody knows a way of viewing the audio waveform of a video file (with a timeline)
Whenever I use mediacoder to compress videos to MP4, LC-AAC, X.264 there is usually a audio delay of between -50 & -350ms. At the moment I encode the first few minutes then watch the video in VLC and alter the delay until it sounds right and then encode the whole file using the same delay. This is a bit hit & miss and quite difficult if there isn't a clear sound to sync with, like a door closing.
This got me thinking that if I could view the audio waveform of the before and after video it would be easy to see the delay. Is there a free program to that can do this?
I guess I am making an assumption that it is the audio that is out of sync with the actual timeline, if the video is out of sync with the timeline this wont help.
Thanks.