9/7/2023 0 Comments Ffmpeg crf vs q![]() Put differently, if you choose ultrafast, the encoding process is going to run fast, but the file size will be larger when compared to medium. The preset determines how fast the encoding process will be – at the expense of compression efficiency. The CRF of 28 should visually correspond to libx264 video at CRF 23, but result in about half the file size. In this example, we will use the following settings: The mode works exactly the same as in x264, so please read the H.264 guide for more info. Use this mode if you want to retain good visual quality and don’t care about the exact bitrate or filesize of the encoded file. In this guide we are going to focus on CRF encoding. 2-pass constant bitrate (see H.264#twopass).1-pass constant bitrate (by setting -b:v). ![]() Similar to x264, the x265 encoder has multiple rate control algorithms, including: According to the FFmpeg online documentation, ”
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