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mkv file containing a h.264-encoded video file you want to playback on a machine that doesn't support the. Mp4tools is mainly for rewrapping h.264 files into a. What kind of video files are you trying to convert? If you have the time to spare, pick 2-pass. So, if you're in any kind of hurry, 1-pass will produce a decent video with roughly the size you wanted. 2-pass will probably produce slightly better results, especially in fast paced action sequences, since it has higher variation capabilities for the bitrate. 2-pass will hit the chosen filesize (or bitrate) exactly, since it knows up front how much bitrate it will need for later scenes in the movie and can rescale everything accordingly.ģ. 2-pass takes longer (since it has an additional pass).Ģ. You will see three differences between the two methods:ġ. The second time, it actually encodes the video. The first time, it only analyzes how much happens and how high the bitrate should be at certain times, and it writes this information down. When you choose 2-pass encoding, the encoder goes through the video twice. You can set a filesize (or average bitrate) for your encoding.
), the bitrate is chosen higher, if hardly anything happens, the bitrate is lowered. If the image changes rapidly (chase scenes, quick cuts. I haven't used mp4tools, but the difference between 1-pass and 2-pass is: Videos are usually encoded with a variable bitrate. Sorry, your question was formulated a little confusingly, so people might have skipped it.
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