[FFmpeg-user] Automatically crop longer file when merging

Stevens, Thom (US - SCPL) thom.stevens at meggitt.com
Thu Jan 23 18:51:49 CET 2014

Hi Samir,

Get the length of the video: see, e.g., http://askubuntu.com/questions/224237/how-to-check-how-long-a-video-mp4-is-using-the-shell

Transcode (copy) the audio to end at that duration: see, e.g., http://askubuntu.com/questions/56022/what-to-use-to-quickly-cut-audio-video

Thom Stevens
Sr. Systems Engineer

Securaplane Technologies
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-----Original Message-----
From: ffmpeg-user-bounces at ffmpeg.org [mailto:ffmpeg-user-bounces at ffmpeg.org] On Behalf Of Samir
Sent: Wednesday, January 22, 2014 4:23 AM
To: ffmpeg-user at ffmpeg.org
Subject: [FFmpeg-user] Automatically crop longer file when merging


I have recorded separatly two files for the same sequence: an mp4 file for the video part and a wav for the audio part. I can mix them easily with ffmpeg.

My problem is that the audio file is longer than the video file, about 1 second only but it produces an out of sync video...

I know I can crop my audio file but I need first to get the duration for my files to known how many time i need to cut.

Is there a way to tell ffmpeg to automatically crop the audio file to fit the duration of my video file?
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