Converts video files to mkv using ffmpeg.

conv2mkv.sh

#! /bin/sh

# filename:    conv2mkv
# description: converts video files to mkv using ffmpeg. for usage and setting check below
# Author:      Ali Mousavi [[email protected]]

################
###  USAGE   ###
################
# if a filename is given as an argument it will convert it.
#                 conv2mkv filename
#
# if "d" is used as an argument, it will convert videos in the working
# directory.
#                 conv2mkv -d
#
# if "-dr" is used as an argument it will convert videos in the working
# direcroty and its subdirectories recursively.
#                 conv2mkv -dr

# this function converts given filename
convert2mkv() {
    INPUT="$1"
    OUTPUT="$(echo $1 | sed -r -e 's/\.\w+$/.mkv/')"
    VCODEC="libx264"       # Video Codec
    # libfdk_aac might not be compiled in the default ffmpeg binary of the
    # distribution. might need to find another package.
    ACODEC="libfdk_aac"    # Audio codec to use: libfdk_aac > aac
    ABITRATE="192k"        # Audio bitrate
    VBITRATE_TS="4M"       # Video bitrate to use for .ts files.
    # This is the compression speed. the slower the better.
    PRESET="medium"        # veryslow > slower > slow > medium > fast > faster
                           # > veryfast > superfast > ultrafast

    # check if the file already has the desired format and if so just copy it
    # to the new container.
    if ffprobe "${INPUT}" 2>&1 | grep "Video: h264"; then
        VCODEC="copy"
    fi
    if ffprobe "${INPUT}" 2>&1 | grep "Audio: aac"; then
        ACODEC="copy"
    fi

    # also if it's a .ts file just copy streams over since converting streams
    # would be very lossy and buggy. if you know a better way tell me.
    if [ "${INPUT: -3}" == ".ts" ]; then
        VCODEC="copy"
        ACODEC="copy"
    fi
    ffmpeg -i "${INPUT}" -c:v "${VCODEC}" -preset ${PRESET} -c:a "${ACODEC}" -b:a ${ABITRATE} "${OUTPUT}"
}

# export the function so that we can use it as an argument for -exec in find
export -f convert2mkv

# show a help message if no argument is specified
if [[ $# -eq 0 ]] ; then
    echo "Error: No arguments specified."
    echo "Usage:"
    echo "conv2mkv [file]    convert file to mkv."
    echo "conv2mkv -d        convert files in the working dir to mkv."
    echo "conv2mkv -dr       convert files in the working dir and its subdirs."
    exit 1
fi

case "$1" in
    # find and convert video files in the working dir and its subdirs.
    "-dr")
        find . -type f \( -iname '*.mpg' -o \
            -iname '*.mpeg' -o \
            -iname '*.wmv' -o \
            -iname '*.mp4' -o \
            -iname '*.avi' -o \
            -iname '*.m4v' -o \
            -iname '*.flv' -o \
            -iname '*.ts' \) \
            -exec bash -c 'convert2mkv "$0"' {} \;;;
    "-d")
        find . -maxdepth 1 -type f \( -iname '*.mpg' -o \
            -iname '*.mpeg' -o \
            -iname '*.wmv' -o \
            -iname '*.mp4' -o \
            -iname '*.avi' -o \
            -iname '*.m4v' -o \
            -iname '*.flv' -o \
            -iname '*.ts' \) \
            -exec bash -c 'convert2mkv "$0"' {} \;;;
    *)
        convert2mkv "$1"
esac