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#!/bin/bash
# See https://video.stackexchange.com/a/32719
set -o nounset
set -o errexit
set -o pipefail
readonly ARGS=( "${@}" );
main()
{
local _avi_path;
_avi_path="${1}"; shift;
local _mkv_path;
_mkv_path="${1}"; shift;
local avi_path;
avi_path="$(readlink --canonicalize-existing "${_avi_path}")";
local mkv_path;
mkv_path="$(readlink --canonicalize-missing "${_mkv_path}")";
# Check whether the mp3 header is missing in the input file
local missing_count;
missing_count=0;
set +o errexit
missing_count="$(ffprobe -hide_banner -i "${avi_path}" 2>& 1 \
| grep -i 'mp3float' \
| grep -c -i 'Header missing')";
set -o errexit
if [ 0 -eq "${missing_count}" ];
then
# Trivial copy
ffmpeg -i "${avi_path}" -c:v copy -c:a copy "${mkv_path}"
else
# Extract the mp3 stream
local mp3_stream;
mp3_stream="$(mktemp --suffix='.mp3')";
ffmpeg -i "${avi_path}" -c:a copy "${mp3_stream}"
# Combine it back into the original AVI file
ffmpeg -i "${avi_path}" -i "${mp3_stream}" \
-c:v libx264 -c:a copy -map 0:v:0 -map 1:a:0 \
"${mkv_path}"
rm "${mp3_stream}"
fi
}
main "${ARGS[@]}"
exit 0
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