[FFmpeg-user] combining concatenating movies

[Stéphane Chauveau]

I was wondering the same things a few days ago and a simple solution 
seems to be the concat filter.

https://ffmpeg.org/ffmpeg-filters.html#concat

A simple example that works fine for me for inputs of the same size and 
no audio is:

ffmpeg \
    -ss 00:00 -t 4 -i input1.mp4 \
    -ss 00:06 -t 5 -i input2.mp4 \
    -ss 01:00 -t 3 -i input3.mp4 \
    -filter_complex 'concat=n=3:v=1:a=0' \
    -an output.mp4

Each of the -ss and -t specifies the start and the duration of the next 
input. You can remove them if you want the full videos but short 
durations are very convenient while experimenting.

The value n=3 passed to the concat filter should match the number of 
inputs.Be careful, ffmpeg will complain if n is too large but it will 
silently ignore some videos if n is too small.

That method requires that the videos are re-encoded so you may want to 
add a few options to control the encoding quality.


On 7/5/19 2:28 AM, R C wrote:
> Hello,
>
>
> I would like to combine a bunch of movies (a dozen or so short ones) 
> to one long movie.
>
> The short movies are from a dashcam, here is some info;
>
> container: Quicktime
>
> dimensions: 1920x1080
>
> Codec: H.264
>
> Framerate: 30 frames per second
>
> Bitrate: varies per file ...
>
> Audio doesn't matter much, there should be no audio
>
>
> I tried a few  ffmpeg  options, tried to find examples online.
>
>
> Any suggestions?
>
>
> thanks,
>
>
> Ron
>
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