#!/bin/bash
#
# Remove a track from a video file
#
# Usage:
#
#    jrmtrack [-n|--no-exec] in-file out-file track-type [track-number]
#
# -n or --no-exec : if set, do not execute ffmpeg but print what would have run
# in-file         : file to trim
# out-file        : write output file here
# track-type      : the track type to remove. Usually 'audio' or 'video'
# track-number    : the track number to remove. If omitted, all tracks whose
#                   type matches `track-type` will be removed
#
SCRIPT="${0}"
SCRIPT_DIR="$(cd "$(dirname "${SCRIPT}")" && pwd)"
. "${SCRIPT_DIR}"/jvc_common

IN_FILE="${1?no in-file provided}"
OUT_FILE="${2?no out-file provided}"
TRACK_TYPE="${3?no track-type provided}"
TRACK_NUMBER="${4}"

echo "
{
  \"assets\": [
    { \"name\": \"input\", \"path\": \"${IN_FILE}\" }
  ],
  \"operations\": [
    {
      \"operation\": \"remove-track\",
      \"creates\": {
        \"name\": \"removed_track\",
        \"dest\": \"${OUT_FILE}\"
      },
      \"source\": \"input\",
      \"track\": {
        \"type\": \"${TRACK_TYPE}\"$(if [[ -n "${TRACK_NUMBER}" ]] ; then echo ",
        \"number\": \"${TRACK_NUMBER}\""; fi)
      }
    }
  ]
}
" | "${SCRIPT_DIR}"/jvc ${JVC_OPTIONS}