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. Often, you want to re-encode video when for example its dimensions change, 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. This is because the original has already been compressed by throwing away information, and by doing it again you're introducing generation loss. You can (usually) not retain full quality when encoding a video that was already encoded. This will help you understand why changing containers works and why the containers MP4 and MKV have little to do with video codecs, actually. To understand why this is necessary, it's important to learn the difference between video codecs and containers. In this case, the codecs will be adapted to the output container. If this command does not work, and if your input uses the wrong codecs for the output container, you will probably have to re-encode. Also, subtitle format support for MP4 is different from MKV, and actually quite restricted, so this command may fail. However, there's a big caveat: this only works if the audio and video codecs are supported in the target (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 MP4Box which can also create MP4 containers - the same exists for MKV with MKVtoolnix. You can swap containers easily with FFmpeg – you just have to tell it to copy the video and audio streams: ffmpeg -i input.mkv -c copy -map 0 output.mp4 This doesn't lose quality, and it'll be a much faster process. Since passthrough is not possible, ask yourself: Do I need to re-encode? If you only want to change the container from MKV to MP4, you usually don't need to encode anything, you just change the "wrapping" around the video. Do I have to re-encode? Couldn't I just swap the container? So, anytime you're changing containers with Handbrake, your video is going to get re-encoded, which means it a) takes time and b) may introduce quality loss. HandBrake is designed to be a video transcoder. Sorry, adding video passthrough is not planned. See also the respective feature request that would have enabled video passthrough: MKV to MP4 in your case), Handbrake will re-encode the video. I can only imagine what a full-powered, brand-new Katamari Damacy would look like on even a Switch today.When you're using Handbrake to convert from one container format to I recall being impressed in the PS2 era by Katamari Damacy, which seemed to be one of the few games of its era that noticed that if you only allocate like 10 polygons and a teenytiny texture for a game world object you can have a crapton of things happening on the screen, at a high frame rate, and build a game around it. They'd just have to be very, very simple games. There's no particular reason other than lack of hardware outputs the PS3-era machines couldn't push 4K games. But obviously, there's a quality stepdown. There's actually a couple of PS2 games that push 1080 (can't remember if it's P or i) with the right setup. There's not really a such thing as "4K" or "1080P" or whatever it's more about fill rates and other numbers and the question of how much you can push at 1080P or whatever, vs. That's something I kinda wish more game ethusiasts would pick up on. Also, I'd expect 8K gaming on even next gen's console to be closer to Wii model quality than what we see in 1080p gaming today."
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