feat(Transpose): transpose video for recording on landscape mode

fix #6

README.md

@@ -32,12 +32,17 @@ $ ios-simulator-gif [options] {out_file} {-- [ffmpeg options]}
 | -r, --rate          | Framerate of the output   |      `6`       |
 | -f, --format        | Output format             |     `gif`      |
 | -vf, --video-filter | Video filter for `ffmpeg` | `scale=320:-1` |
+|  -t, --transpose    | Transpose the video for landscape orientation | N/A |
 | --no-watermark      | Remove watermark from gif |      N/A       |
 | -h, --help          | Prints helper message     |      N/A       |
 | -v, --version       | Prints current version    |      N/A       |
 
 If no file name is given, it will save the gif to `./simulator.gif`
 
+When recording a video in landscape mode you'll need to provide the appropriate transposing argument. It's usually the following:
+1. `--transpose 1` when the simulator is rotated 90º (camera to the right)
+2. `--transpose 2` when the simulator is rotated 270º (camera to the left)
+
 ### Sending extra arguments to `ffmpeg`
 
 If you need to send extra arguments to `ffmpeg`, everything sent after double slashes (`--`) will be

bin/ios-simulator-gif

@@ -14,8 +14,8 @@ VIDEO=/tmp/simulator-gif.mov
 ##############
 main() {
   parse_args "$@"
-  # check_booted
-  # record
+  check_booted
+  record
   convert_gif
 }
 
@@ -87,6 +87,10 @@ convert_gif() {
   PALLETE="/tmp/palette.png"
   FILTERS="${HIDE_WATERMARK-$WATERMARK_CMD,}${VIDEOFILTER},fps=${RATE}"
 
+  if [[ ! -z "${TRANSPOSE}" ]]; then
+    FILTERS="${FILTERS},transpose=${TRANSPOSE}"
+  fi
+
   ffmpeg -v warning -i ${VIDEO} -vf "$FILTERS,palettegen=stats_mode=diff" -y ${PALLETE}
   ffmpeg -i ${VIDEO} -i ${PALLETE} -lavfi "$FILTERS,paletteuse=dither=bayer:bayer_scale=5:diff_mode=rectangle" -r $RATE -f $FORMAT -y $FILE_NAME $EXTRA &> /tmp/ffmpeg.log
 
@@ -129,6 +133,10 @@ parse_args() {
       echo "${PKG_VERSION}"
       exit 0
       ;;
+      -t|--transpose)
+      TRANSPOSE="$2"
+      shift 2
+      ;;
       --no-watermark)
       HIDE_WATERMARK=''
       shift 1
@@ -165,6 +173,7 @@ display_help() {
   echo "  -r, --rate                  Framerate of the output (default: 15)"
   echo "  -f, --format                Output format (default: gif)"
   echo "  -vf, --video-filter         Video filter for ffmpeg (default: scale=320:-1:flags=lanczos)"
+  echo "  -t, --transpose             Transpose the video for landscape orientation (usually 1 for 90deg and 2 for 270deg)"
   echo "  --no-watermark              Remove watermark from gif"
   echo "  -h, --help                  Outputs this help message"
   echo "  -v, --version               Outputs the version number"