[FFmpeg-user] Remove audio from DV file not working

[dave at dericed.com]

> On Dec 26, 2016, at 11:25 PM, Tim Hiles <thiles at confex.com> wrote:
> 
> Hi all,
> 
> I figured out a workaround (three step process) and for posterity's sake
> figured I'd mention it here.
> 
> #1. Transcode to AVI like so:
> 
> ffmpeg -i "clip-2007-01-01 17;02;58.dv" -vcodec copy -vtag dvsd -acodec
> pcm_s16le -f avi -y "clip-2007-01-01 17;02;58.dv.avi"
> 
> #2. Remove the audio with the usual -an command:
> 
> ffmpeg -i "clip-2007-01-01 17;02;58.avi" -c:v copy -an -map 0:0
> "noaudio.avi"
> 
> #3. Transcode the AVI back to DV
> 
> ffmpeg -i "output.avi" -target ntsc-dv video.dv
> 
> Unless anyone else knows of a more efficient way to do this?

You could do this in one step with
ffmpeg -i "clip-2007-01-01 17;02;58.dv” -target ntsc-dv -an video.dv

However this is not a lossless step since you are transcoding dv video to dv video. Since a dv encoding contains both audio and video the -c:v copy process should still give you both video and audio (as well as camera metadata, timecode, captions, etc that are in the dv encoding).
Dave Rice