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ffmpeg : add info about scaling down.

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Dmitry Voronin 2023-11-27 11:29:56 +03:00
parent 22aaddc2bc
commit 90813aa852
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help/media/ffmpeg.md
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@ -46,3 +46,24 @@ ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format
```text
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
```
# Scale down video.
```text
ffmpeg -i input4kvid.mp4 -vf scale=1920:1080 output1080vid.mp4
```
This one may require using -2 or -4 in some cases.
```text
ffmpeg -i input.avi -vf scale=720:-1 -c:a copy output.mkv // -1 for auto height.
```
For vaapi use `scale_vaapi=-1:720`.
# Limit to specific CPUs.
```text
taskset -c 0 ffmpeg...
taskset -c 0,2 ffmpeg...
```