First of all, ask yourself: Do you need to re-encode? If you only want to change the container from MKV to MP4, you don't need to encode anything, you just change the 'wrapping' around the video. This doesn't lose quality. You can swap containers easily with – you just have to tell it to copy the video and audio bitstreams: ffmpeg -i input.mkv -c:v copy -c:a copy output.mp4 Note that this only works if the audio and video codecs are supported in the MP4 container, which is the case for H.264/H.265 and AAC, for example, but not for many others. There are also tools like which can create MP4 media — the same exists for MKV with.

Finally, learn the. This will help you understand why changing containers works and why MP4 and MKV have little to do with video, actually. If you want to know more about FFmpeg – I wrote about it. However, you can not retain full quality when encoding a video that was already encoded. This is because the original has already been compressed by throwing away information, and by doing it again you're introducing.

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Often, you want to re-encode video when for example its size changes, or you need a specific bit rate to squeeze your video stream into, or your original video uses a codec that you can't play for whatever reason. So, if you load your MKV video into Handbrake, and re-encode it with x264, the h.264 encoder Handbrake uses, store it in an MP4 container, you are going to lose quality no matter what, unless you set the bitrate or quality factor so high that you won't (really) see the difference. But then, the file size will be bigger as well. In the ideal case, you would convert the video to an uncompressed video, which won't lose you any quality, but give you files of a dozen Gigabytes in size, even for a few minutes of video material. If you really have to re-encode, make sure not to set an average bitrate, but choose a, which is something like 'constant quality'. Just like 'variable bit rate' for MP3: It will make sure to spend the bits on the video parts that need them and make the overall quality better — at the same file size.

Sane CRF values are from 19 to 24, where lower means 'better'. So, you could try with a Rate Factor of 19. Also, make sure to set the 'High' profile, which enables the encoder to use all bells and whistles and optimize the quality for a given bit rate.

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Hi, first try: -hls-prefer-native 'URL/file.mpd' Cheers. Hello aazerty.

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I am TeRrOkToR's brother, we are trying to solve this problem together. We tried now the command you told, but it didn't work. Have a look at the pictures attached. I tried both commands youtube-dl -hls-prefer-native and youtube-dl -hls-prefer-ffmpeg, and they didn't work. Please, do you mind if I send you a message inbox and you have a look at the website we are dealing with, so you will be able to tell us the best tool to download the videos. Thank you very much for your help.