Personal list of useful FFmpeg scripts/commands

useful-ffmpeg-scripts.md

Personal list of useful FFmpeg scripts/commands

Personal collection of complicated FFmpeg commands that I sometimes use for anime and stuff.

Split a 5.1 surround audio source into separate uncompressed WAV files

ffmpeg -i input -filter_complex "channelsplit=channel_layout=5.1[FL][FR][FC][LFE][SL][SR]" -map "[FL]" front_left.wav -map "[FR]" front_right.wav -map "[FC]" front_center.wav -map "[LFE]" lfe.wav -map "[SL]" back_left.wav -map "[SR]" back_right.wav

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For blu-ray audio sources utilising DTS-HD MA, this essentially downgrades it to regular ol' DTS without re-encoding (by removing the "lossless part" of DTS-HD MA)

ffmpeg -i input -bsf:a dca_core -c:a copy output

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Upgrade an audio source to Dolby Digital (AC3) to allow native casting to home theatre systems (use whichever bitrate you prefer)

ffmpeg -i input -c:a ac3 -b:a ???k output.ac3

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Convert a 5.1 audio source to 2.0 encoded with Dolby Pro Logic II (supported by older HT systems)

ffmpeg -i input -af "aresample=matrix_encoding=dplii:out_channel_layout=stereo" -b:a ???k output

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Create a silent surround 5.1 track for (x) seconds @ 48kHz

ffmpeg -f lavfi -i anullsrc=channel_layout=5.1:sample_rate=48000 -t (x) -b:a ???k silence.ac3

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For raw Sentai Filmworks rips, removes duplicate tracks and downgrades DTS-HD MA to regular DTS (assumes the release has no English dub)

ffmpeg -i input.m2ts -map 0 -map -0:a:1 -map -0:s:1 -bsf:a dca_core -c copy output.m2ts

batch version (assumes working folder contains nothing but the stuff you want to do this to):

for /f %f in ('dir /b .') do ffmpeg -i "%f" -map 0 -map -0:a:1 -map -0:s:1 -bsf:a dca_core -c copy "output_%f"

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Mostly for Funimation blu-ray releases, these remove the rear channels from the English dub track (usually encoded in 5.1 Dolby TrueHD). For everything except movies, the mixed-in rear channels are mostly fake and artificial, wasting a few megabytes.

this is for just the audio track after it's extracted:

ffmpeg -i input -af "pan=3.0|c0=c0|c1=c1|c2=c2" output

if you get your goods from "[EMBER]" or "iAHD", this makes a perfect copy with the rear channels removed from the dub (assumes you want the audio to be in Dolby AC3):

ffmpeg -i input.mkv -map_metadata 0 -filter_complex "[0:a:0]pan=3.0|c0=c0|c1=c1|c2=c2[a0]" -c:v copy -c:s copy -map 0:V? -map [a0] -c:a:0 ac3 -metadata:s:a:0 language=en -map 0:a:1 -c:a:1 ac3 -metadata:s:a:1 language=jpn -map 0:s? -map 0:d? -map 0:t? output.mkv

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This just copies everything over (except the cover art, if any) - kind of useless

ffmpeg -i input.mkv -c:v copy -c:a copy -c:s copy -map 0:V? -map 0:a? -map 0:s? -map 0:d? -map 0:t? output.mkv