The DiffALL Blog
Practical guides on image and video quality metrics, compression, and media comparison workflows.
What Are Non-Square Pixels? Anamorphic Video Explained
Some videos are meant to be stretched on playback. Why their pixels are not square, why some tools show them squashed, and how to convert them safely.
Video QualityWhy Do My Video's Colours Look Different in Every Player?
Washed-out blacks in one app, oversaturated reds in another. Usually the file never said which colour standard it uses, so each player guesses differently.
Video QualityWhy Does My Video Play Sideways? The Rotation Flag Explained
Phone videos are often stored sideways with a note saying 'turn this'. Players that ignore the note show it on its side. How to check and how to fix it for good.
Video QualityWhy Won't My 10-Bit Video Open? Bit Depth and Compatibility
10-bit footage avoids banding in skies and gradients, and it is also a common reason a video will not play or import. How to check it and convert it safely.
Video QualityAV1 vs H.264: Which Should You Upload?
AV1 is smaller at the same quality — and half the tools in your pipeline cannot read it. Here is the trade, and why bitrate alone judges it unfairly.
Image QualityIs My Photo Too Noisy? Grain vs Detail
Noise and texture look identical to most tools. The measurement that separates them is where it is taken — and when it should decline to answer.
Video QAIs My Screen Recording Good Enough to Share?
Screen capture breaks the usual rules: text needs bitrate that photos do not, and a variable frame rate is correct. What to check before you send it.
Video QualityIs My Video Too Dark or Blown Out?
Crushed blacks and blown highlights are the one grading fault you can measure without the original. Here is the number, and the two things that fake it.
Image QualityWhat Does a Quality Score Out of 100 Mean?
Most single-number quality scores are an average, and an average hides the one thing that is broken. Here is a formula that cannot, and how to read it.
Audio QualityWhat Sample Rate Should My Audio Be?
44.1 or 48 kHz, and why 96 rarely earns its size. What the sample rate actually caps, and how to tell a rate problem from a bitrate problem.
Audio QualityWhy Does My Audio Sound Thin? Stereo That Isn't
A file can be stereo in every byte of metadata and mono in content. The measurement that catches it is not correlation — here is the one that works.
Video QualityWhy Is My Video Stuttering? Duplicate Frames
A file can claim 60fps and carry 30. The measurement that catches a padded frame rate, and the three kinds of footage it must never accuse.