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ffmpeg.md

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Transcode Audio

# Convert audio to mp3
ffmpeg -i '<INPUT_FILE>' -vn -c:a libmp3lame -b:a 320k out.mp3

# Convert audio to flac
ffmpeg -i '<INPUT_FILE>' -vn -c:a flac out.flac

# Convert audio to wav
ffmpeg -i '<INPUT_FILE>' -vn -c:a pcm_s16le out.wav

# Convert audio to oga
ffmpeg -i '<INPUT_FILE>' -vn -c:a libvorbis -q:a 8 out.oga

# Convert audio to opus
ffmpeg -i '<INPUT_FILE>' -vn -c:a libopus -b:a 96k out.opus

# Convert every flac file in the current directory to mp3
for f in *.flac; do ffmpeg -i  "$f" -vn -c:a libmp3lame -b:a 320k "${f%.flac}.mp3"; done;

# increase audio by 150%
ffmpeg -i '<INPUT_FILE>' -vn -filter:a "volume=1.5" '<OUTPUT_FILE>'

# increase audio by 10dB
ffmpeg -i '<INPUT_FILE>' -vn -filter:a "volume=10dB" '<OUTPUT_FILE>'

Transcode Video

# Convert a video to mov (x265) with okay quality
ffmpeg -i '<INPUT_FILE>' -c:v libx265 -crf 28 -c:a aac -vbr 3 -tag:v hvc1 out.mov

# Convert video to x264
ffmpeg -i '<INPUT_FILE>' -c:v libx264 -preset slow -crf 22 -c:a aac -vbr 3 -pix_fmt yuv420p -movflags +faststart out.mp4

# Convert video to ogv
ffmpeg -i '<INPUT_FILE>' -c:v libtheora -q:v 10 -c:a libvorbis -q:a 10 out.ogv

# Convert video to webm
ffmpeg -i '<INPUT_FILE>' -c:v libvpx-vp9 -b:v 0 -crf 24 -threads 4 -speed 0 -c:a libvorbis -q:a 8 -f webm out.webm

# Convert every MOV file in the current directory to audioless webm
for f in *.MOV; do ffmpeg -i "$f" -an -c:v libvpx-vp9 -b:v 0 -crf 24 -threads 4 -speed 0 -f webm "${f%.MOV}.webm"; done;

# convert a video to gif with okay quality
ffmpeg -i '<INPUT_FILE>' -r 15 -vf "scale=512:-1,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" '<OUTPUT_FILE>'

Trim audio/video

# Trim audio/video (ex: start at 5 sec and go until 2 min)
ffmpeg -i '<INPUT_FILE>' -c:a copy -c:v copy -ss 5 -to 120 '<OUTPUT_FILE>'

Video Effects

Rotation

  • 0 = 90° CounterCLockwise and Vertical Flip (default)
  • 1 = 90° Clockwise
  • 2 = 90° Counter-Clockwise
  • 3 = 90° Clockwise and Vertical Flip

-vf "transpose=2,transpose=2" or -vf "hflip" for 180 degrees.

# Rotate video 90° Clockwise
ffmpeg -i '<INPUT_FILE>' -vf "transpose=1" -c:v libtheora -q:v 10 -c:a libvorbis -q:a 10 '<OUTPUT_FILE>'

# Rotate using metadata (no transcode needed)
ffmpeg -i '<INPUT_FILE>' -c copy -metadata:s:v rotate="90" '<OUTPUT_FILE>'

Slow-Motion/Timelapse

# Timelapse - 16x slowdown, forced 60fps
ffmpeg -i '<INPUT_FILE>' -an -r 60 -vf "setpts=0.0625*PTS" -c:v libtheora -q:v 10 out.ogv

# Slow-Motion - 8x speedup, forced 30fps
ffmpeg -i '<INPUT_FILE>' -an -r 30 -vf "setpts=8*PTS" -c:v libtheora -q:v 10 out.ogv

# Convert every MOV file in the current directory to audioless webm, slowed down 8x
for f in *.MOV; do ffmpeg -i "$f" -an -r 30 -vf "setpts=8*PTS" -c:v libvpx-vp9 -b:v 0 -crf 24 -threads 4 -speed 0 -f webm "${f%.MOV}.webm"; done;

Deinterlace

ffmpeg -i '<INPUT_FILE>' -c:v libx265 -crf 28 -vf yadif -an -tag:v hvc1 out.mov

Join MP4s

# Convert all files to ts, then concatenate them
for f in *.mp4; do ffmpeg -i "$f" -c copy -bsf:v h264_mp4toannexb -f mpegts "${f%.mp4}.ts"; done;
ffmpeg -i "concat:FILE1.ts|FILE2.ts|FILE3.ts" -c copy -bsf:a aac_adtstoasc '<OUTPUT_FILE>'

loop a video and/or audio file

# loop a a/v file 5 times and dump the result into the output
ffmpeg -stream_loop 5 -i '<INPUT_FILE>' -c copy '<OUTPUT_FILE>'

combine srt & video into mkv

ffmpeg -fflags +genpts -i '<VIDEO_FILE>' -f srt -i '<SRT_FILE>' -map 0:0 -map 0:1 -map 1:0  -c:v copy -c:a copy -c:s srt 'OUTPUT.mkv'