Generally this would be done first by analyzing the file before running the
ffmpeg command. Usually in the form of a small script.
Though scripting is not on topic for this mailing list, here is one anyways.
dependencies:
mediainfo
ffmpeg
------------------------------
#!/bin/bash
cid="$(mediainfo --Inform="Video;%CodecID%" "$1")";
if [ "$cid" = "avc1" ]
then
echo "CodecID: $cid - Copy";
ffmpeg -i "$1" -c:v copy ;
else
echo "CodecID: $cid - Encode";
ffmpeg -i "$1" -c:v libx264 ;
fi
------------------------------
Execute the script using the input filename as the first argument.
$ ./script.sh /path/to/input/video.mp4
If you have any questions please feel free to reply direct =]
Cheers
> On Jun 22, 2017, at 10:57 23PM, tony_rui <[email protected]> wrote:
>
> I want to automatically set a codec.
> For example, if the codec of a movie is h264, set -c:v copy. Otherwise, set
> -c:v libx264.
> Please tell me the way to do.
>
> Thank you for reading this mail.
>
> tony_rui
>
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