Installation using brew
x265 conversion
Trimming
Splitting into parts
Join audio and video tracks
Joining multiple videos into one
Remux MKV to MP4 including all streams
Export all audio tracks from input video files
MP4 Fast Start
- Check if MOOV atom is at the beginning of the file
- Enable Fast Start/move MOOV atom to beginning of file
Subtitles
Shifting subtitle timestamps
- Batch processing
Various utilities
lsmedia.zsh

FFmpeg

Installation using brew

brew tap varenc/ffmpeg
brew install varenc/ffmpeg/ffmpeg –with-fdk-aac

x265 conversion

Command	Effect
Conversion to Apple-compatible H265
Convert non-H265 with existing AAC audio	`for i in *.mp4;ffmpeg -i $i -c:v libx265 -crf 28 -preset veryfast -vtag hvc1 -movflags faststart -c:a copy ${i/.mp4}.x265.mp4`
Convert non-H265 without existing AAC audio	`for i in *.mp4;ffmpeg -i $i -c:v libx265 -crf 28 -preset veryfast -vtag hvc1 -movflags faststart -c:a aac -b:a 128k ${i/.mp4}.x265.mp4`
Convert H265 MKV without existing AAC audio	`for i in *.mkv;ffmpeg -i $i -vcodec copy -c:a aac -b:a 128k -pix_fmt yuv420p -tag:v hvc1 -movflags faststart ${i/.mkv}.mp4`
Convert hev1 tag to hvc1	`for i in *.x265.mp4;ffmpeg -i $i -c copy -map 0 -vtag hvc1 -movflags faststart -c:a copy ${i/.mp4}.hvc1.mp4`

Trimming

ffmpeg -i input.mp4 -ss 00:02:39 -to 00:03:05 -c:v copy -c:a copy output.mp4

Splitting into parts

for i in 0 30 60 90 120 150 180 210 240 270 300;ffmpeg -i dragon4.mix\ -\ Amateur\ Teikyou\ CD-ROM\ $Japan$\ $NEC\ PC-FXGA$-pBJu9J-Jw98.mp4 -ss $i -t 30 dragon_$i.mp4

Join audio and video tracks

ffmpeg -i video.mp4 -i audio.m4a -c copy output.mp4

Joining multiple videos into one

ffmpeg -i “concat:input1.mp4|input2.mp4|input3.mp4|input4.mp4” -c copy output.mp4

Remux MKV to MP4 including all streams

ffmpeg -i $i -codec copy -map 0 ${i/.mkv}.mp4

Export all audio tracks from input video files

Check which tracks are present and which IDs they have.
ffprobe -v error -show_entries stream=index,codec_name,codec_type input.mkv
For the main conversion command, note that the first audio track in the source file is 0:a:0, the second is 0:a:1, etc. Here is an example for a batch one-line:
exportdir=/yoko/share/export; for i in *.mp4;ffmpeg -i $i -map 0:a:0 -c copy $exportdir/${i/mp4}deutsch.m4a -map 0:a:1 -c copy $exportdir/${i/mp4}english.m4a

MP4 Fast Start

Check if MOOV atom is at the beginning of the file

ffmpeg -v trace -i file.mp4 2>&1 | grep -e type:'mdat' -e type:'moov'

[mov,mp4,m4a,3gp,3g2,mj2 @ 0x5576c36880] type:'moov' parent:'root' sz: 9919011 40 1603822784
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x5576c36880] type:'mdat' parent:'root' sz: 1593903733 9919059 1603822784

Enable Fast Start/move MOOV atom to beginning of file

ffmpeg -i original.mp4 -movflags faststart -c copy new.mp4

Subtitles

Shifting subtitle timestamps

ffmpeg -itsoffset 23.5 -i input.srt -c copy output.srt

Batch processing

for i in *.srt;do ffmpeg -itsoffset 23.5 -i $i -c copy ${i/srt/shifted.srt};done

Various utilities

lsmedia.zsh

lsmedia () {
        ls -1rt $@ | while read -r line
        do
                echo \"$line\"
                mediainfo --Inform="Video;%CodecID%" $line
                mediainfo --Inform="Audio;%CodecID%" $line
        done | sed 'N;N;s/\n/\; /g' | column -t -s ";"
}

lsmedia Examples

Command	Result
`lsmedia *.MOV`	"MVI_9797.MOV" avc1 sowt "MVI_9798.MOV" avc1 sowt "MVI_9799.MOV" avc1 sowt "MVI_9800.MOV" avc1 sowt "MVI_9801.MOV" avc1 sowt
`lsmedia .MOV \| sed 's/\“\ \ .$/\”/'`	"MVI_9797.MOV" "MVI_9798.MOV" "MVI_9799.MOV" "MVI_9800.MOV" "MVI_9801.MOV"

Wolfs KB

Table of Contents