====== 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'''
<code>
[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
</code>

=== Enable Fast Start/move MOOV atom to beginning of file ===
''ffmpeg -i original.mp4 -movflags faststart -c copy new.mp4''


===== Subtitles =====
==== Shifting subtitle timestamps ====
<code bash>ffmpeg -itsoffset 23.5 -i input.srt -c copy output.srt</code>
=== Batch processing ===
<code bash>for i in *.srt;do ffmpeg -itsoffset 23.5 -i $i -c copy ${i/srt/shifted.srt};done</code>


===== Various utilities =====
==== lsmedia.zsh ====
<code bash>
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 ";"
}
</code>

== lsmedia Examples ==
^ Command ^ Result ^
| ''lsmedia *.MOV'' | <code>"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</code> |
| ''lsmedia *.MOV | sed %%'%%s/\"\ \ .*$/\"/%%'%%'' | <code>"MVI_9797.MOV"
"MVI_9798.MOV"
"MVI_9799.MOV"
"MVI_9800.MOV"
"MVI_9801.MOV"</code> |