Improve README

README.md

@@ -1,19 +1,76 @@
 # js-vmaf: Simple, but effective VMAF comparison tool
 This is a simple wrapper around FFmpeg and VMAF to handle comparison of files.
 
+```
+$node . --help
+usage: js-vmaf [--help] [--hide_banner] [-q] [-v] --ffmpeg FFMPEG --ffprobe FFPROBE [--vmaf VMAF] -r
+               REFERENCE [-o OUTPUT] [--flip] [-cs COLOR_SPACE] [-cp COLOR_PRIMARIES] [-ct COLOR_TRC]
+               [-cr COLOR_RANGE] [-p FORMAT] [-w WIDTH] [-h HEIGHT] [--fps FPS] [-f FEATURE] [-m MODEL]
+               [-t THREADS]
+               Path [Path ...]
+
+A simple, yet effective tool to quickly compare one or more videos using VMAF.
+
+positional arguments:
+  Path                  One or more paths to a distorted file or a directory containing distorted files.
+
+optional arguments:
+  --help                show this help message and exit
+  --hide_banner         Hide license banner.
+  -q, --quiet           Be quiet.
+  -v, --verbose         Be verbose.
+  --ffmpeg FFMPEG       Path to the FFmpeg binary to use.
+  --ffprobe FFPROBE     Path to the FFprobe binary to use.
+  --vmaf VMAF           Path to the VMAF binary to use. Will fall back to FFmpeg if not provided
+  -r REFERENCE, --reference REFERENCE
+                        Reference file
+  -o OUTPUT, --output OUTPUT
+                        The file name, including formatters, for the output log file.
+  --flip                Scale, convert and resample to distorted file instead of reference file.
+  -cs COLOR_SPACE, --color_space COLOR_SPACE
+                        Define the color space of the reference file.
+  -cp COLOR_PRIMARIES, --color_primaries COLOR_PRIMARIES
+                        Define the color primaries of the reference file.
+  -ct COLOR_TRC, --color_trc COLOR_TRC
+                        Define the color transfer characteristics of the reference file.
+  -cr COLOR_RANGE, --color_range COLOR_RANGE
+                        Define the color range of the reference file.
+  -p FORMAT, --format FORMAT
+                        Define the format for comparison.
+  -w WIDTH, --width WIDTH
+                        Define the width for the comparision.
+  -h HEIGHT, --height HEIGHT
+                        Define the height for the comparision.
+  --fps FPS             Define the FPS for comparison.
+  -f FEATURE, --feature FEATURE
+                        Enable (and configure) a feature
+  -m MODEL, --model MODEL
+                        Enable (and configure) a model
+  -t THREADS, --threads THREADS
+                        Number of threads to use.
+```
+
+
 ## Installing
 ```
 npm install
 npm run build
 ```
 
-## Usage
+## Examples
+
+##### Compare all files in a directory
 ```
-node . --help
+$(prog) --ffmpeg ffmpeg --ffprobe ffprobe -r /mnt/usb0/ref.mp4 /mnt/usb1/
 ```
 
-## Examples
-### Compare all files in a directory
+##### Use the distorted files as the target size
+The following command converts the reference to the same format, resolution, framerate and color as the distorted files. Ideal for bitrate optimization.
 ```
-node . --ffmpeg ./ffmpeg --ffprobe ./ffprobe -r /mnt/usb0/reference.mp4 /mnt/usb1/
+$(prog) --ffmpeg ffmpeg --ffprobe ffprobe --flip -r /mnt/usb0/ref.mp4 /mnt/usb1/
+```
+
+##### Resize everything to 1080p and convert to yuv420p
+```
+$(prog) --ffmpeg ffmpeg --ffprobe ffprobe -h 1080 -p yuv420p -r /mnt/usb0/ref.mp4 /mnt/usb1/
 ```

source/index.ts

@@ -298,7 +298,7 @@ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS \"AS IS\" AN
 
 			// Convert format.
 			if (this._args.format || (this._ref.video[0].pix_fmt !== fref.video[0].pix_fmt)) {
-				chain.push(`format=pix_fmts=${valueOrDefault(this._args.format, valueOrDefault(fref.video[0].pix_fmt, "yuv420p"))}`)
+				chain.push(`format=pix_fmts=${valueOrDefault(this._args.format, valueOrDefault(fref.video[0].pix_fmt, "yuv420p"))}`);
 			}
 
 			filters.push(`[0:v:0]${chain.join(",")}[ref]`);
@@ -355,7 +355,7 @@ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS \"AS IS\" AN
 
 			// Convert format.
 			if (this._args.format || (cmp.video[0].pix_fmt !== fref.video[0].pix_fmt)) {
-				chain.push(`format=pix_fmts=${valueOrDefault(this._args.format, valueOrDefault(fref.video[0].pix_fmt, "yuv420p"))}`)
+				chain.push(`format=pix_fmts=${valueOrDefault(this._args.format, valueOrDefault(fref.video[0].pix_fmt, "yuv420p"))}`);
 			}
 
 			filters.push(`[1:v:0]${chain.join(",")}[dst]`);