===== ffmpeg cheatsheet =====

not linking that man page good lord

[[https://cheat-sheets.org/project/tldr/command/ffmpeg/|ffmpeg TLDR]], [[http://cheat.sh/ffmpeg|ffmpeg cheat.sh]]

==== audio ====

=== FLAC to MP3 ===

one-off:

<code bash>
ffmpeg -i "$FILE.flac" -ab 320k -map_metadata 0 -id3v2_version 3 "$FILE.mp3"
</code>

bash loop:

<code bash>
for f in *.flac; do ffmpeg -i "$f" -ab 320k -map_metadata 0 -id3v2_version 3 "${f%.*}.mp3"; done
</code>

==== video to frames ====

see ''~/.local/bin/vidtools'' ([[https://bytes.4-walls.net/kat/dotfiles/src/commit/73e1380fd1dd186ce5925ab20b4529b4928e91cf/config/.local/bin/vidtools#L11|dotfiles]]) for the default/most used option (every frame including duplicates).

=== 1/1 frames ===

<code bash>
ffmpeg -i "$FILE" -filter:v fps=fps=1/1 %04d.jpg
</code>

=== 1/2 frames ===

<code bash>
ffmpeg -i "$FILE" -filter:v fps=fps=1/2 %04d.jpg
</code>

==== re-encode ====

now mostly consolidated in ''vidtools'' (linked above), but copied here just in case.

=== x264 (AVC), no GPU ===

<code bash>
ffmpeg -i "$FILE.mp4" -c:v libx264 -crf 18 -c:a copy -c:s copy "$FILE.mkv"
</code>

=== x265 (HEVC), no GPU ===

<code bash>
ffmpeg -i "$FILE.mp4" -c:v libx265 -vtag hvc1 -crf 18 -c:a copy -c:s copy "$FILE.mkv"
</code>

=== x265 (HEVC), GPU, bash loop ===

<code bash>
for f in *.mkv; do ffmpeg -hwaccel cuda -hwaccel_output_format cuda -i "$f" -c:v hevc_nvenc -vtag hvc1 -profile main -preset slow -rc vbr_hq -c:a copy -c:s copy -map 0 "${f%.*} HEVC.mkv"; done
</code>

=== AVI/DivX/XviD to MKV, bash loop ===

<code bash>
for f in *.avi; do ffmpeg -fflags +genpts -i "$f" -c:v copy -c:a copy -c:s copy "${f%.*} AVI2MKV.mkv"; done
</code>

=== copy video, remove audio, bash loop ===

<code bash>
for f in *.mp4; do ffmpeg -i "$f" -vcodec copy -an "${f%.mp4}_noaudio.mp4"; done
</code>

=== camcorder sources ===

GPU accelerated camcorder source MPEG+AC3+VOBSUB to x264+AC3+VOBSUB (little to no file size reduction, for web uploads)

<code bash>
ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -extra_hw_frames 10 -i "input.mkv" -c:a copy -c:v h264_nvenc -c:s copy -b:v 5M "output.mkv"
</code>