Guía Vidlora
How video compression works
Video compression exploits the fact that most of what changes between consecutive frames is small — a codec can describe those small changes far more compactly than storing every pixel of every frame from scratch.
4 minutos de lectura
Keyframes and predicted frames
Not every frame is stored in full. Periodic "keyframes" hold a complete picture; frames in between are mostly described as differences from nearby frames, which is why fast, chaotic motion compresses worse than a mostly-static shot.
Bitrate is the real quality knob
Bitrate is how much data is allowed per second of video. A higher bitrate cap lets the encoder preserve more detail; a lower cap forces it to discard more. Tools usually expose this indirectly, as a "quality" or CRF setting, rather than asking for a raw bitrate number.
Why re-encoding isn't perfectly reversible
Once detail is discarded during compression, it can't be recovered by decompressing and recompressing again — which is why repeatedly re-encoding the same file at low quality gradually looks worse each time ("generation loss"), and why lossless operations like trimming avoid re-encoding whenever possible.
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