larsdecoder

#!/bin/bash
# lars decoder
# author: dave rice dave@dericed.com
version="1.0"
F50=""

usage(){
    echo
echo "$(basename ${0}) ${version}"
    echo "Transcode the input(s) to XDCamHD50 PAL 25p (MXF OP1a) 1920x1080 (or PAL 50i with the -i option). By default the output will be written to the same directory as the input. You can override this with the -o option."
    echo "Dependencies: a recent ffmpeg"
    echo "Usage: $(basename $0) [ -o /directory/to/write/to/ ] [ -i ] file1 [ file2 ...]"
    echo " -o directory ( directory to write the resulting file to )"
    echo " -n (dry-run mode, show the commands that would be run but don't do anything)"
    echo " -i use 50i instead of 25p"
    echo " -h ( display this help )"
    echo
exit
}
[ "${#}" = 0 ] && usage

# command-line options to set mediaid and original variables
OPTIND=1
while getopts ":o:nih" opt ; do
case "${opt}" in
        o) outputdir_forced="$OPTARG" && _check_outputdir_forced ;;
        n) DRYRUN=true;;
        i) F50="Y";;
        h) usage ;;
        *) echo "bad option -$OPTARG" ; usage ;;
        :) echo "Option -$OPTARG requires an argument" ; exit 1 ;;
    esac
done
shift $(( ${OPTIND} - 1 ))

while [ "${*}" != "" ] ; do
    input="$1"
    echo "$input"
    name=$(basename "${input%.*}")
    subdirectory="xdcam_mxf"
    if [ -z "${outputdir_forced}" ] ; then
        outputdir=$(dirname "${input}")"/${subdirectory}"
        logdir="$(dirname "${input}")/${subdirectory}/logs"
    else
        outputdir="${outputdir_forced}"
        logdir="${outputdir_forced}/logs"
    fi

    # set up output
    output="${outputdir}/${name}.mxf"
    if [ -s "${output}" ] ; then
        echo "WARNING ${output} already exists, skipping transcode"
        shift
        continue
    fi
    mkdir -p "${outputdir}"

    # clear local arrays
    unset inputoptions
    unset middleoptions

    # encoding options
    inputoptions+=(-vsync 0)
    middleoptions+=(-map 0:v)
    middleoptions+=(-map 0:a)

    middleoptions+=(-vf "scale='if(gt(iw,ih),1920,-1)':'if(gt(iw,ih),-1,1080)':interl=1,format=yuv422p,pad=ih*16/9:ih:(ow-iw)/2:(oh-ih)/2,setsar=1/1,setdar=16/9,fps=fps=pal")
    middleoptions+=(-c:v mpeg2video)
    middleoptions+=(-pix_fmt yuv422p)
    middleoptions+=(-intra_vlc 1)
    middleoptions+=(-non_linear_quant 1)
    middleoptions+=(-q:v 1)
    middleoptions+=(-qmin 1)
    middleoptions+=(-qmax 8)
    middleoptions+=(-g 15)
    middleoptions+=(-b:v 50M)
    middleoptions+=(-maxrate:v 50M)
    middleoptions+=(-minrate:v 50M)
    middleoptions+=(-bufsize 17825792)
    middleoptions+=(-rc_init_occupancy 17825792)
    middleoptions+=(-dc 10)
    middleoptions+=(-lmin QP2LAMBDA)
    middleoptions+=(-flags +ildct+ilme+low_delay)
    middleoptions+=(-ps 1)
    
    middleoptions+=(-c:a pcm_s16le)
    middleoptions+=(-ar 48k)
    middleoptions+=(-ac 2)

    if [ "${logdir}" != "" ] ; then
        mkdir -p "${logdir}"
        export FFREPORT="file=${logdir}/%p_%t_$(basename "$0")_${version}.txt"
        inputoptions+=(-v warning -stats)
    else
        export FFREPORT=""
    fi
    ffmpeg ${inputoptions[@]} -i "${input}" ${middleoptions[@]} "${output}"
    shift
done