ffmpeg : add info about scaling down.
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@ -45,4 +45,25 @@ ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format
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```text
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ffmpeg -i audio.flac -i image.png -map 0:a -map 1 -codec copy -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (front)" -disposition:v attached_pic output.flac
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```
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# Scale down video.
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```text
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ffmpeg -i input4kvid.mp4 -vf scale=1920:1080 output1080vid.mp4
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```
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This one may require using -2 or -4 in some cases.
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```text
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ffmpeg -i input.avi -vf scale=720:-1 -c:a copy output.mkv // -1 for auto height.
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```
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For vaapi use `scale_vaapi=-1:720`.
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# Limit to specific CPUs.
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```text
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taskset -c 0 ffmpeg...
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taskset -c 0,2 ffmpeg...
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```
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