Putting this into a repo
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MIT License
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Copyright (c) 2023 Neale Pickett
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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The software is provided "as is", without warranty of any kind, express or
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implied, including but not limited to the warranties of merchantability,
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fitness for a particular purpose and noninfringement. In no event shall the
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authors or copyright holders be liable for any claim, damages or other
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liability, whether in an action of contract, tort or otherwise, arising from,
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out of or in connection with the software or the use or other dealings in the
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software.
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This is a shell script to transcode stuff to h.264.
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It uses the Raspberry Pi's hardware acceleration
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(`h264_v4l2m2m` codec)
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to encode the h.264 files.
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I don't know if the ffmpeg code is immature,
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or if I just don't understand ffmpeg,
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but this codec demands some special treatment,
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which this shell script provides.
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#! /bin/sh
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set -e
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usage () { cat <<EOD 1>&2; }
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Usage: $0 [OPTIONS...] SRC [SRC...]
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Re-encodes to h.264.
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Output will be written to \$SRC.h264.mp4
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-width W Rescale to no wider than W
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-height H Rescale to no taller than H
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-1080p Rescale to no bigger than 1080p
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-720p Rescale to no bigger than 720p
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-480p Rescale to no bigger than 480p
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-swenc Software encode instead of hardware
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In addition to transcoding video,
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this will force any subtitles into mov_text.
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This is due to some odd interaction between
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ffmpeg, h264_v4l2m2m, and mp4.
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EOD
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width=iw
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height=ih
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codec=h264_v4l2m2m
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bitrate="-b:v 2048k"
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while true; do
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case "$1" in
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-width|--width)
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width=$1
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shift
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;;
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-height|--height)
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height=$1
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shift
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;;
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-1080p|--1080p)
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width=1920
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height=1080
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bitrate="-b:v 2048k"
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shift
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;;
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-720p|--720p)
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width=1280
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height=720
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bitrate="-b:v 3000k"
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shift
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;;
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-480p|--480p)
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width=640
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height=480
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bitrate="-b:v 512k"
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shift
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;;
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-swenc|--swenc)
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codec=h264
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shift
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;;
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-*)
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usage
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exit
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;;
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*)
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break
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;;
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esac
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done
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if [ "$codec" = "h264" ]; then
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bitrate="-crf 28"
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fi
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log () {
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echo "=== $*"
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}
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cmd () {
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nice "$@"
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}
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# This got a height of 719 (n%2 must = 0)
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#-vf "scale='min($width,iw)':'min($height,ih)':force_original_aspect_ratio=decrease,format=yuv420p" \
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for fn in "$@"; do
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base=${fn%.*}
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filename=$(basename "$fn")
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intermediate="$base.nut"
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out="$base.h264.mkv"
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[ -f "$out" ] && continue
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case "$fn" in *.h264.mp4) continue ;; esac
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# ffmpeg has some bizarro thing where the h264_v4l2m2m codec won't write to a mkv file,
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# In addition, some subtitles interfere with it too.
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# Solution: transcode video + audio into an intermediate file,
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# then add back any subtitles.
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log "$filename - Scale/Transcode"
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cmd ffmpeg \
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-hide_banner \
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-loglevel warning \
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-stats \
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-i "$fn" \
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-map 0:v \
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-vf "scale=-2:'min($height,ih)':force_original_aspect_ratio=decrease,format=yuv420p" \
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-c:v $codec \
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$bitrate \
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-map 0:a \
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-c:a copy \
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-num_capture_buffers 16 \
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-num_output_buffers 32 \
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-y \
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"$intermediate"
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log "$filename - Add subtitles"
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cmd ffmpeg \
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-hide_banner \
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-loglevel warning \
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-stats \
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-i "$intermediate" \
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-i "$fn" \
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-map 0:v \
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-c:v copy \
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-map 0:a \
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-c:a copy \
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-map 1:s? \
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-c:s copy \
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-y \
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"$out"
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echo rm "$intermediate"
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done
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