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Using ffmpeg to add height (as black bars) to video file without quality loss
You can do transformations with -c:v libx264 -crf 0 X264 has lossless mode, which it enters with -crf 0. … And you also can recomress lossles into more compressed lossless.
Everything for lossless is the same as for all x264's, except that it is the real lossless. …