qui a dit que réencoder degrage l'image ?

Tiré du manuel de cce :

Generally at least two passes are required to create a variable bitrate stream for specifying an average bitrate. This is because the complexity of images is checked and saved in a file by the first pass, and the allocation of the bit amount for each frame is calculated according to the stored information on the complexity of the images, and encodingis executed in the next pass.
Unlike a general encoder, Cinema Craft Encoder does not distinguish between a pass for encoding and a pass for analyzing complexity, but always analyzes the complexity of images during encoding. Therefore, a video information file does not always have to be recreated to change the setting of an average,
minimum and maximum bitrate.

A video information file has a history of information for a plurality
of times of encoding, and information is accumulated each time encoding is executed. This information improves the image quality for encoding by the Multipass VBR system.