[FFmpeg-user] Different audio rates on input DV files

[Bill Moseley]

On Tue, Jan 15, 2019 at 6:27 PM Bill Moseley <moseley at hank.org> wrote:


> $ ffmpeg -f concat -safe 0 -i input.txt -vf yadif out.mp4
>
> Apparently audio settings on the camera changed during that day.
>
> $ ffmpeg -i 'clip-1999-07-29 13;25;19.dv' 2>&1 | grep Audio
>     Stream #0:1: Audio: pcm_s16le, 32000 Hz, stereo, s16, 1024 kb/s
>     Stream #0:2: Audio: pcm_s16le, 32000 Hz, stereo, s16, 1024 kb/s
>
> $ ffmpeg -i 'clip-1999-07-29 13;26;20.dv' 2>&1 | grep Audio
>     Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
>
>
I guess the answer is in the documentation:
https://ffmpeg.org/ffmpeg-formats.html#concat

"All files must have the same streams (same codecs, same time base, etc.)."


Looks like I need to normalized the dv files first, so any that are not
48000 Hz:

$ ffmpeg -i input.dv -ar 48000 out.dv


-- 
Bill Moseley
moseley at hank.org