Detect Video Resolution
Video resolution has always been something I've been interested in, starting with the purchase of my first HD television. The HD video quality felt life-changing, especially when watching the World Cup, which I'd bought that TV for. I carried that enthusiasm through to being an early adopter of 4K TVs, which are absolutely amazing.
These days you can get 4K videos on YouTube, Netflix, and other networks, and I see that Samsung and Sony are even offering 8K televisions. With that in mind, I wanted to figure out how to detect video resolution from a downloaded video file. Let's check it out!
Standard Video Resolutions
The following are standard video resolutions you may recognize:
| Standard | Resolution | Aspect Ratio | Pixels |
|---|---|---|---|
| DVD | 720 × 480 (NTSC) | 4:3 or 16:9 | 345,600 |
| 720 × 576 (PAL) | 414,720 | ||
| 720p (HDTV) | 1280 × 720 | 16:9 | 921,600 |
| 1366 × 768 (FWXGA) | 1,049,088 | ||
| 1080i, 1080p (HDTV, Blu-ray) | 1920 × 1080 | 16:9 | 2,073,600 |
| 4K (UHDTV) | 3840 × 2160 | 16:9 | 8,294,400 |
| 8K (UHDTV) | 7680 × 4320 | 16:9 | 33,177,600 |
This wikipedia page provides other popular resolutions used in different devices.
Detect Video Resolution with ffprobe
Installing ffmpeg provides another utility, ffprobe, which allows us to get the resolution of a video file, albeit with a cryptic command:
eval $(ffprobe -v error -of flat=s=_ -select_streams v:0 -show_entries stream=height,width MyVideo.mkv)
size=${streams_stream_0_width}x${streams_stream_0_height}
echo $size // "3840x1606"
We can create a shell alias function to make this type of video resolution query more dynamic:
getVideoResolution() {
eval $(ffprobe -v error -of flat=s=_ -select_streams v:0 -show_entries stream=height,width $1)
size=${streams_stream_0_width}x${streams_stream_0_height}
echo $size
}
# getVideoResolution myVideo.mkv
Many media sites allow you to choose the video quality you prefer, so knowing the maximum video quality available (that of the original source, in theory) is useful.
Retrieving the resolution of a video isn't difficult using ffprobe!
