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2. Compression artifact - Wikipedia

   en.wikipedia.org/wiki/Compression_artifact

   The lower the bit rate, the more coarsely the coefficients are represented and the more coefficients are quantized to zero. Statistically, images have more low-frequency than high-frequency content, so it is the low-frequency content that remains after quantization, which results in blurry, low-resolution blocks. In the most extreme case only ...

3. MPEG-1 - Wikipedia

   en.wikipedia.org/wiki/MPEG-1

   MPEG-1 is a standard for lossy compression of video and audio.It is designed to compress VHS-quality raw digital video and CD audio down to about 1.5 Mbit/s (26:1 and 6:1 compression ratios respectively) [2] without excessive quality loss, making video CDs, digital cable/satellite TV and digital audio broadcasting (DAB) practical.

4. Video compression picture types - Wikipedia

   en.wikipedia.org/wiki/Video_compression_picture...

   These different algorithms for video frames are called picture types or frame types. The three major picture types used in the different video algorithms are I, P and B. [1] They are different in the following characteristics: I‑frames are the least compressible but don't require other video frames to decode.

5. Comparison of video codecs - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_video_codecs

   Additional procedures can be used for averaging. For example, experts whose opinions are considered unstable (such as if their correlation with average opinion is found to be low) may have their opinions rejected. In the case of video codecs, this is a very common situation. When codecs with similar objective results show results with different ...

6. Video quality - Wikipedia

   en.wikipedia.org/wiki/Video_quality

   Video quality is a characteristic of a video passed through a video transmission or processing system that describes perceived video degradation (typically compared to the original video). Video processing systems may introduce some amount of distortion or artifacts in the video signal that negatively impact the user's perception of the system.

7. Reference frame (video) - Wikipedia

   en.wikipedia.org/wiki/Reference_frame_(video)

   Very high numbers of reference frames are rarely useful in terms of quality for live-action material because frames from further back in time generally have less and less correlation with the current frame. This is not as true for animated sources, where repetitive motion can make high numbers of reference frames more useful.