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--- cheatsheet:ffmpeg [2025/08/16 02:08] – created melo
+++ cheatsheet:ffmpeg [2025/09/11 04:44] (current) – melo
@@ Line 4: / Line 4: @@
 [[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 ====
@@ Line 19: / Line 35: @@
 <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 -qmin 24 -qmax 24 -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>