[FFmpeg-user] streams

[Vladimir Bilichenko]

> 25 груд. 2014 о 00:17 Lou <lou at lrcd.com> написав(ла):
> 
> On Wed, 24 Dec 2014 15:11:53 +0200
> Vladimir Bilichenko <belikwolf at gmail.com> wrote:
> 
>> Do you have any ideas how I can solve my problem?
> 
> You have to add an audio source. Otherwise where would the audio come
> from? One method:
> 
> "aevalsrc=0|0:d=18.2[a0];[0:v][a0][1:v][1:a][2:v][2:a]concat=n=3:v=1:a=1"
> 
> See http://ffmpeg.org/ffmpeg-filters.html#aevalsrc
> 

Thank you for your answer. Here is my solution of the problem:
target_width=1920
target_height=1080
target_aspect_ratio=$target_width/$target_height

./ffmpeg -y -i silence.aac -i mp4.mp4 -i ogv.ogv -i ogv2.ogv -vcodec ppm \
-s $target_width'x'$target_height \
-filter_complex "[1:v][0:a] [2:v][2:a] [3:v][3:a] concat=n=3:v=1:a=1:unsafe=1 [v] [a];[v]scale=iw*sar:ih[v2], [v2]pad=max(iw\,ih*($target_aspect_ratio)):ow/($target_aspect_ratio):(ow-iw)/2:(oh-ih)/2 [v3]" \
-aspect $target_width':'$target_height \
-b:v '512K' -b:a '128K' -strict -2 -c:v libx264 -preset ultrafast -map [v3] -map [a] -r 30 outtmp.mp4
> You may need to scale, pad, and/or crop the video from the first input
> before feeding it to concat.
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