Add libaom-av1 encoder examples
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### AV1
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> [AV1 Encoding Guide](https://trac.ffmpeg.org/wiki/Encode/AV1)
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#### libaom-av1
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```
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ffmpeg -i "/mnt/storage/MediaLibrary/input/Joker/test.mkv" -metadata title="Joker" -disposition 0 \
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-c:v libaom-av1 -crf 23 -b:v 0 -cpu-used 6 -row-mt 1 -map 0:v:0 -metadata:s:v:0 title="Video" \
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-c:a libopus -b:a 768k -ac:a 8 -map 0:a:0 -map 0:a:3 -metadata:s:a:0 title="English [7.1ch]" -metadata:s:a:0 language=eng -metadata:s:a:1 title="German [7.1ch]" -metadata:s:a:1 language=ger -disposition:a:0 default \
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-c:s copy -map 0:s:0 -map 0:s:1 -metadata:s:s:0 title="English [PGS]" -metadata:s:s:0 language=eng -metadata:s:s:1 title="German [PGS]" -metadata:s:s:1 language=ger -disposition:s:0 default \
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/mnt/storage/MediaLibrary/output/Joker/test-libaom-av1.mkv
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```
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Additional settings for increased speed and cpu usage:
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```
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-g 239: keyframes every ~10s (fps * 10)
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-tiles 2x2: multiple parallel encoding tiles to speed up performance (4 in total here)
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```
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```
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ffmpeg -i "/mnt/storage/MediaLibrary/input/Joker/test.mkv" -metadata title="Joker" -disposition 0 \
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-c:v libaom-av1 -crf 23 -b:v 0 -cpu-used 6 -row-mt 1 -g 239 -tiles 2x2 -map 0:v:0 -metadata:s:v:0 title="Video" \
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-c:a libopus -b:a 768k -ac:a 8 -map 0:a:0 -map 0:a:3 -metadata:s:a:0 title="English [7.1ch]" -metadata:s:a:0 language=eng -metadata:s:a:1 title="German [7.1ch]" -metadata:s:a:1 language=ger -disposition:a:0 default \
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-c:s copy -map 0:s:0 -map 0:s:1 -metadata:s:s:0 title="English [PGS]" -metadata:s:s:0 language=eng -metadata:s:s:1 title="German [PGS]" -metadata:s:s:1 language=ger -disposition:s:0 default \
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/mnt/storage/MediaLibrary/output/Joker/test-libaom-av1-tiling-keyframes.mkv
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```
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