Encoding Discussion Megathread (ffmpeg, Handbrake, AV1, etc...)

Code:

for i in *.mkv; do \

    # Step 1 is to strip a year from these media files all in the 20XX range

    j="${i#20[0-1][0-6].}" && \

    # Step 2 strips the crap afterwards leaving us with "Media.Name" not ideal, but easily scripted

    k="${j%.1920x810.BDRip.x264.DTS-HD.MA.mkv}" && \

    # Keep ffmpeg quiet, but this is too quiet and only shows stats and QSV initialization

    ffmpeg -hide_banner -loglevel warning -v quiet -stats \

    -hwaccel qsv -hwaccel_output_format qsv -qsv_device /dev/dri/renderD129 \

    # Map streams -- you can map a single stream multiple times to create copies for stereo + 5.1

    -i "${i}" -map 0:v -map 0:a:1 -map 0:a:2 -map 0:a:1 -map 0:s:0 -map 0:s:1 \

    # Set default streams -- set mapped audio stream 0 as default, turn off default flag on audio stream 1

    -disposition:a:0 default -disposition:a:1 0 \

    # (Over)write the file's metadata if it's junk -- can be plaintext

    -metadata title="${j}" \

    # Set bit rates -- all subjective, need to experiment with individual media

    # I have been using 4, 6, 10, and 12 as arbitrary test points and setting max at 2x -b:v, bufsize at 4x

    -c:v av1_qsv -preset slower -b:v 12M -maxrate:v 24M -bufsize:v 48M \

    # Look ahead offers better bit rate control but slows down encoding I believe (AV1 limits depth to 100 frames)

    -look_ahead 1 -look_ahead_depth 100 \

    # Set metadata stream data (s=stream v=video 0=index title=key

    -metadata:s:v:0 title='1080p FHD 24FPS AV1 12Mbps ABR' \

    # Even w/ multiple audio streams, set the codec once if you only use one codec

    -c:a libopus -ac:a:0 2 -b:a:0 192k \

    # Don't use -af, use -filter:[stream] if using pan or other filters, as you need stream index

    # if multiple streams exist (e.g., two audio streams and one is 2.0, one is 5.1).

    -filter:a:0 "pan=stereo|FL<FC+0.30*FL+0.30*BL|FR<FC+0.30*FR+0.30*BR" \

    # Writing these because they display in Jellyfin on the media page...

    -metadata:s:a:0 title='English OPUS Stereo Dialog Mix' \

    -ac:a:1 6 -b:a:1 256k -metadata:s:a:1 title='English OPUS 5.1' \

    -c:s copy -metadata:s:s:0 title='English' -metadata:s:s:1 title='English (SDH)' \

    "${k} [Extra Info You.Definitely.Need]-AwesomeReleaseGroup.mkv"

Code:

IPATH="/path/to/input/media" && \

OPATH="/path/to/output/encoded/media" && \

# desired output extension

EXT="mkv" && \

# strips this off the end of filenames, requires spaces and special chars to be escaped

CLEAN=".1080p.REMUX.VC-1.EAC35.1-LMAO.mkv" && \

QUAL="BDRip" && \

RES="1080p" && \

# release group or source

GRP="OctAV10" && \

# audio language/s (e.g., "EN+DE+JA")

LNG="EN" && \

# subtitle languages (see above)

SUBS="EN" && \

# desired primary audio stream index, mapped 2x by default

STAUD="0" && \

# if additional audio streams desired, map here, uncomment appropriate line

ADAUD="-map x:a:y"

# desired primary subtitle stream index

STSUB="0" && \

# if additional subtitle streams desired, map here, uncomment appropriate line

ADSUB="-map p:s:q"

# Set minimum VMAF, ab-av1 default is 95

VMAF="96" && \

# Set CRF floor, ab-av1 default is 10

LCRF="12" && \

# Set CRF ceiling, ab-av1 ceiling is MAX

XCRF="28" && \

# Set desired preset, values vary by encoder, SVT-AV1 default for ab-av1 is 8

PRESET="4" && \

# Film grain synthesis level

FGRN="4" && \

# Additional mapping, note this will be ordered AFTER all other video, audio, sub streams

ADDMP="" && \

# Doom9 'midnight dialog' stereo mixdown audio filter

AFLTR="pan=stereo|FL<FC+0.30*FL+0.30*BL|FR<FC+0.30*FR+0.30*BR" && \

# Desired metadata condensed to make main script more readable

MDATA="-metadata title=${MEDIA%${CLEAN}} | Jellyfin \

    -metadata:s:v:0 title='AV1 VMAF ~${VMAF}' \

    -metadata:s:a:0 title='English OPUS Stereo Dialog Mix' \

    -metadata:s:s:0 title='English' \

    -metadata:s:s:1 title='English (SDH)' \

    -metadata:s:s:2 title='English (PGS)'" && \

#

#

# LEFT INTENTIONALLY BLANK

#

#

for MEDIA in "${IPATH}"/*.mkv; do \

    # Get filename from full path

    FNAME=$(basename "${MEDIA%${CLEAN}}")

    ONAME="${OPATH}/${FNAME}-[${QUAL}-${RES}.AV1.OPUS.2.0][${LNG}][${SUBS}]-${GRP}" && \

    TEMP="${ONAME}.temp.${EXT}" && \

    OFILE="${ONAME}.${EXT}" && \

    echo "Beginning auto-encode for ${FNAME}..."

    # auto-encode only handles the AV1 video stream

    ab-av1 auto-encode \

        --encoder libsvtav1 --preset "${PRESET}" --svt tune=0 --min-vmaf "${VMAF}" \

        --min-crf "${LCRF}" --max-crf "${XCRF}" --svt film-grain="${FGRN}" \

        -i "${MEDIA}" -o "${TEMP}" && \

    # let ffmpeg do the heavy (light?) lifting of mapping and audio encoding

    ffmpeg -i "${TEMP}" -map_metadata 0 -map 0:v \

        -map 0:a:"${STAUD}" \

        #-map 0:s:"${STSUB}" -map 0:s:1 -map 0:s:2 \

        -c:v copy -c:a libopus -c:s copy \

        -b:a:0 256k -ac:a:0 2 -filter:a:0 "${AFLTR}" \

        "${MDATA}"

        "${OFILE}" && \

    rm "${TEMP}"; done