mirror of https://gitlab.com/octtspacc/OcttKB
66 lines
1.4 KiB
Plaintext
66 lines
1.4 KiB
Plaintext
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created: 20221008141221923
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modified: 20230206111552123
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modifier: Octt
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tags: Snippets $:/i18n:en
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title: FFmpeg/Snippets
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!! Flags
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* Specify an input file: `-i ${File}`
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* Framerate: `-r ${r}`, `-framerate ${r}` (//use both because one sometimes doesn't work//)
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!!! Filter Flags
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//These are specified by prefixing an argument://
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* Audio: `-filter:a` or `-af`
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* Video: `-filter:v` or `-vf`
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!!!! Audio Filters
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* Volume: `volume=`
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** `±{n}dB`: Adding or Subtracting to absolute value in dB
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** `{%/100}`: Target percentage divided by 100 (e.g: //150% -> 1.5//)
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* Detecting volume details: `volumedetect -f null /dev/null` (just prints to console)
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!!!! Video Filters
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* Scaling: `scale=${w}:${h}`
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* [[Cropping|https://video.stackexchange.com/questions/4563/how-can-i-crop-a-video-with-ffmpeg]]: `crop=${w}:${h}:${x}:${y}`
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!!! Audio/Video Flags
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//These are specified as `-flag:a` or `-flag:v`.//
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* Bitrate: `-b:{a|v} ${n}{k|m|...}`
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* Codec: `-c:{a|v} ${codec}`
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!!!! Audio Flags
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* Audio channels: `-ac ${n}`
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!! Codecs List
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!!! Special
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* `copy`: Copy data stream without re-encoding (if supported by container)
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!!! Audio Codecs
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* `libopus`
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!!! Video Codecs
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* `h263`, `h264`, `libx265`
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* `libvpx-vp8`, `libvpx-vp9`
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* `libaom-av1`
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!! Tips
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* [[Trim Video|https://shotstack.io/learn/use-ffmpeg-to-trim-video]]
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* [[Image+Audio -> Video|https://superuser.com/questions/1041816/combine-one-image-one-audio-file-to-make-one-video-using-ffmpeg]]
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