Editing Working with Audio and Video

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# Managing Media Files

## Setup
    brew install ffmpeg mediainfo mkvtoolnix mp4box

[Handbrake](http://handbrake.fr/)
[Subler](http://code.google.com/p/subler/downloads/list)

mv SublerCLI /usr/local/bin/SublerCLI

## Identifying Problems in Files
    mediainfo source.mkv

## Convert Audio

### Extract AC3 / DTS
    ffmpeg -i video.mkv -acodec copy audio.ac3

### Convert to AC3
    ffmpeg -i audio.dts -acodec ac3 -ab 448k -ac 6 output.ac3

### Convert to AAC
    ffmpeg -i audio.dts -acodec aac -ab 192k -ac 2 -strict -2 output.m4a
    ffmpeg -i audio.dts -acodec libfaac -ab 192k -ac 2 output.m4a

### Convert to AAC 5.1
    ffmpeg -i audio.dts -acodec aac -ab 1536k -ac 6 -strict -2 output.m4a
    ffmpeg -i audio.dts -acodec libfaac -ab 1536k -ac 6 output.m4a

### Convert to FLAC
    ffmpeg -i audio.dts output.flac

## Convert Container

### Convert AVI to MKV
Ordering of tracks will change with from file to file.

for video in *.avi; do
        filename=$(basename "$video" .avi)
        echo "Processing $filename ...";
        /Applications/Mkvtoolnix.app/Contents/MacOS/mkvmerge -o "${filename}.mkv" \
            --language "0:eng" --track-name "0:XVID" --forced-track "0:no" \
            --language "1:eng" --track-name "1:MP3 2.0" --forced-track "1:no" \
            --audio-tracks 1 --video-tracks 0 \
            --no-subtitles --no-track-tags --no-global-tags --no-chapters \
            "${filename}.avi" --track-order "0:0,0:1"
    done

### Convert MKV to MP4
Alternatives:
    https://github.com/Bilalh/MKV-Utilities/blob/master/encoding.sh
    https://github.com/flexiondotorg/MKV-to-MP4/blob/master/MKV-to-MP4.sh

SublerCLI -source source.mkv -dest source.mp4

for video in *.mkv; do
        filename=$(basename "$video" .mkv)
        echo "Processing $filename ...";
        SublerCLI -source "${filename}.mkv" -dest "${filename}.mp4"
        mp4box -unhint "${filename}.mp4"
        mp4box -hint "${filename}.mp4"
    done

ffmpeg -i input.mkv -vcodec copy -acodec copy -scodec copy
    ffmpeg -i input.mkv -vcodec copy -acodec aac -ab 192k -ac 2 -strict -2 output.m4a -scodec copy # (2ch)
    ffmpeg -i input.mkv -vcodec copy -acodec aac -ab 1536k -ac 6 -strict -2 output.m4a -scodec copy # (5.1ch)

### Convert MP4 to MKV
    /Applications/Mkvtoolnix.app/Contents/MacOS/mkvmerge -o "destination.mkv" \
        --language "0:eng" --track-name "0:6ch AC3" --default-track "0:yes" --forced-track "0:no" --compression "0:none" \
        --language "1:eng" --track-name "1:x264"    --default-track "1:yes" --forced-track "1:no" --compression "1:none" --display-dimensions "1:1280x720" \
        --audio-tracks 0 --video-tracks 1 --no-subtitles --no-track-tags --no-global-tags --no-chapters \
        "source.mkv" --track-order "0:1,0:0"

### Convert FLV to MP3
The same applies to any supported audio codec in the FLV.

ffmpeg -i source.flv -vn -acodec copy destination.mp3

### Convert FLV to MKV/MP4
This assumes that the MKV/MP4 container accepts the audio / video format in the FLV.  
[Windows](http://www.moitah.net/#FLVExtract)

ffmpeg -i source.flv -vcodec copy -acodec copy destination.mkv
    ffmpeg -i source.flv -vcodec copy -acodec copy destination.mp4

### Fixing MP4 Hinting Metadata
    mp4box -unhint source.mp4
    mp4box -hint source.mp4

for video in *.mp4; do
        filename=$(basename "$video" .mp4)
        echo "Processing $filename ...";
        mp4box -unhint "${filename}.mp4"
        mp4box -hint "${filename}.mp4"
    done

### Fixing MKV Metadata

#### Remove Header Compression
Some hardware players have issues with header compression introduced in 4.0.0

/Applications/Mkvtoolnix.app/Contents/MacOS/mkvmerge -o "destination.mkv" \
        --no-attachments --compression '-1:none' \
        "source.mkv"

#### Reorder and Correct Tracks
    /Applications/Mkvtoolnix.app/Contents/MacOS/mkvmerge -o "destination.mkv" \
        --language "0:eng" --track-name "0:6ch AC3" --default-track "0:yes" --forced-track "0:no" --compression "0:none" \
        --language "1:eng" --track-name "1:x264"    --default-track "1:yes" --forced-track "1:no" --compression "1:none" --display-dimensions "1:1280x720" \
        --audio-tracks 0 --video-tracks 1 --no-subtitles --no-track-tags --no-global-tags --no-chapters \
        "source.mkv" \
        --track-order "0:1,0:0"

#### Reorder and Correct Tracks in Groups of Files
    for video in *.mkv
    do
        filename=$(basename "$video" .mkv)
        audio_track_id=$(/Applications/Mkvtoolnix.app/Contents/MacOS/mkvmerge -i "$video" | grep -m 1 "audio" | cut -d ":" -f 1 | cut -d " " -f 3)
        video_track_id=$(/Applications/Mkvtoolnix.app/Contents/MacOS/mkvmerge -i "$video" | grep -m 1 "video" | cut -d ":" -f 1 | cut -d " " -f 3)
        # echo " $filename : $audio_track_id : $video_track_id ";
         /Applications/Mkvtoolnix.app/Contents/MacOS/mkvmerge -o "${filename}.clean.mkv" \
            --language "${audio_track_id}:eng" --track-name "${audio_track_id}:2ch AC3" --default-track "${audio_track_id}:yes" --forced-track "${audio_track_id}:no" --compression "${audio_track_id}:none" \
            --language "${video_track_id}:eng" --track-name "${video_track_id}:x264"    --default-track "${video_track_id}:yes" --forced-track "${video_track_id}:no" --compression "${video_track_id}:none" --display-dimensions "${video_track_id}:1280x720" \
            --audio-tracks $audio_track_id --video-tracks $video_track_id --no-subtitles --no-track-tags --no-global-tags --no-chapters \
        "${filename}.mkv" \
            --language "0:eng" --track-name "0:SRT" --forced-track "0:no" --subtitle-tracks 0 --no-video --no-audio --no-track-tags --no-global-tags --no-chapters "${filename}.srt" \
            --track-order "0:${video_track_id},0:${audio_track_id},1:0"
    done

## Misc.

### Extract Fonts from MKV
    for i in $*; do
        echo $i
        ids=`mkvmerge -i "$i"  | grep -oP '(?<=Attachment ID )[0-9]+'`
        for id in $ids; do
            mkvextract attachments "$i" $id
        done
    done

### Extract Subtitles from MKV
    for i in ./**/*.mkv; do
        echo "$i"
        #Subs=`MediaInfo "$i" | grep -A 1 Text | grep ID | head -n 1 | grep -oP "\d+"`
        Subs=`mkvmerge -i "$i" | grep 'subtitles' | grep -oP '(?<=Track ID )\d+'`
        Name=${i%.*}
        mkvextract tracks "$i" ${Subs}:${Name}.ssa
    done

### Extract Audio from MKV
    for i in ./**/*.mkv; do
        filename=$(basename "$i" .mkv)
        ffmpeg -i "$i" -acodec copy "${filename}.ac3"
    done

### Recursively Convert / Encode WAV to FLAC

```
for file in ./**/*.wav; do
    echo "Processing $file ...";
    flac --delete-input-file --preserve-modtime --verify --best --exhaustive-model-search --keep-foreign-metadata "$file"
done
```

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