[FFmpeg-user] how to create black video and one slient piece of audio

[Paul B Mahol]

On 7/31/15, qw <applemax82 at 163.com> wrote:
> Hi,
>
>
> My question is:
>
>
> 1)
> how to create one mp4 clip via ffmpeg, in  which video is black and audio is
> silent?

ffmpeg.exe -f lavfi -i color=s=hd720:d=5 -f lavfi -i anullsrc -strict
-2 -shortest out.mp4

>
>
> 2)
> How to merge multiple mp4 files into one mp4 file without video/audio
> encoding or decoding?

See ffmpeg's concat demuxer documentation.

>
> Thanks!
>
>
> B.R.
>
>
> Andrew
>
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