ffmpeg : add info on how to add Album cover to music.
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# Encoders:
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* h264: SW - `libx264`, HW - `h264_vaapi`.
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* h265: SW - `libx265`, HW - `hevc_vaapi`.
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# VHS to h264.
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```bash
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```text
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ffmpeg -i 'concat:VTS_01_1.VOB|VTS_01_2.VOB|VTS_01_3.VOB|VTS_01_4.VOB|VTS_01_5.VOB' -c:v libx264 -c:a aac -standard NTSC -preset veryslow -vf yadif ./out.mkv
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```
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# Add audio.
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```bash
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```text
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ffmpeg -i video.mkv -i audio.mp3 -map 0 -map 1:a -c:v copy -shortest output.mkv
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```
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# Replace audio.
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```bash
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```text
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ffmpeg -i Episode\ S01E03.mkv -i RUS\ Sound/Episode\ S01E03.mka -c copy -map 0:v:0 -map 1:a:0 -shortest with_audio/Episode\ S01E03.mkv
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```
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# Add thumbnail to mkv.
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```bash
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```text
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ffmpeg -i video.mkv -attach cover.jpg -metadata:s:t:0 mimetype=image/jpeg -c copy out.mkv
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```
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# Hardware vaapi.
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Encode only:
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```bash
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```text
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ffmpeg -vaapi_device /dev/dri/renderD128 -i video.mkv -vf 'format=nv12,hwupload' -c:v hevc_vaapi out.mkv
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```
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Decode + encode:
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```bash
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```text
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ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i video.mkv -c:v hevc_vaapi out.mkv
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```
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# Add image to music (Album cover).
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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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