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Mpv – A free, open-source, and cross-platform media player

mpv.io

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Re: Mpv – A free, open-source, and cross-platform media player

#181

Post by Panzer04 »

NavinF wrote: post #140
variadix wrote: post #111

Earlier quoted context omitted.

I think technically he’s correct (I haven’t worked on media decoding code, but I understand how common video encoding formats work). If you have a long video with only a single key frame at the beginning then to step back you would need to, starting from the beginning of the video, decode every frame up to the previous frame you wanted to jump to in order to apply frame deltas, also assuming you have some sort of fra…

> video with only a single key frame at the beginning I've literally never seen a video like that in my life, but I'd still expect it to work. Just decode everything starting from frame 1. My desktop can decode H265 at 1,666 fps. I can wait. https://docs.nvidia.com/video-technologies/video-codec-sdk/1...

That blows up pretty quickly though? Even a 10 minute video will take in the worst case ~20 seconds to decode at that rate.

Not really an excuse not to have it (since most video wont be encoded in such an insane way), but the developers owe no obligation to users to implement it.

Re: Mpv – A free, open-source, and cross-platform media player

#184

Post by upon_drumhead »

j1elo wrote: post #118
lairv wrote: post #69

I use it to inspect video frames by frames, particularly being able to go back one frame. VLC doesn't support it, this thread about the feature is hilarious https://forum.videolan.org/viewtopic.php?t=120627

Wow those answers are indeed funny. I agree that as an OSS dev/maintainer, it's easy to fall on the vice of over-generalization and crusade for the perfect solution, and it feels that's exactly what happened there. > this feature is algorithmically impossible > You're just looking at one specific video, not the general problem. > is not generally possible. As a fellow multimedia dev, man, who cares? Sometimes we forg…

> But excuses about not being possible for absolutely every possible codec in a completely generic way is just denying that the world is just a chaotic and dirty place where things are not ideal nor perfect.

It's also not consistently applied. VLC will happily let you jump around in the videos, so his claim that the only way to do it is to play the video as fast as possible from the start of the video just doesn't jive with what is already there.

Re: Mpv – A free, open-source, and cross-platform media player

#185

Post by mixmastamyk »

mixmastamyk wrote: post #139
0cf8612b2e1e wrote: post #113

Earlier quoted context omitted.

What non-maintenance work needs doing? From the outside, it plays basically all the formats. There is always the potential for improving algorithms, but it strikes me as pretty feature complete.

> has many small seek/sync issues Playback issues... scrub problems mentioned elsewhere, audio/video get out of sync when seeking a lot; need to hit left arrow to reset, speed changes lag when changed a lot, when there's a short clip it can end audio early, etc, etc. Not a huge deal, but if you use it every day for video and audio file testing/lyric transcribing these little bugs get old. The playback core needs a re…

Also, https://news.ycombinator.com/item?id=41278499

Re: Mpv – A free, open-source, and cross-platform media player

#186

Post by chungy »

pengaru wrote: post #128
lottin wrote: post #71

Earlier quoted context omitted.

If I recall correctly, for a brief time mplayer disappeared from Debian. At the time I evaluated various alternatives and mpv was one of them, but I switched back to mplayer as soon as it made its way back to the distribution. For me, mplayer is the standard media player. I guess I just don't see any reason to switch to mpv or to any other player.

I see no reason to cling to mplayer/mplayer2, mpv has pushed things forward from there. mplayer is what I used to use ages ago, can't think of a single thing I miss that it did which mpv doesn't. Like you, I was introduced to mpv through the debian disappearance, and it's been fine. Forks can be necessary to keep development active; it's one of the core features of FOSS.

mplayer has DVD menu support, mpv doesn't. I use Kodi if I need to navigate DVD menus these days, which is rare but it happens...

Re: Mpv – A free, open-source, and cross-platform media player

#187

Post by chungy »

amlib wrote: post #52
thegeomaster wrote: post #16

Earlier quoted context omitted.

mpv does it! Period key (.) for next frame, comma (,) for previous. Super handy.

You can also hold those keys to play normally at the speed set with [ and ], so you can actually play the video in reverse and slow motion or whatever. Be aware that it's usually very intensive on cpu time (and maybe gpu decoding if applicable) since it has to usually go back a whole keyframe and compute all frames between while doing that, which may result in less than smooth playback on some videos.

Reverse usually works significantly worse, at least with common video codecs that work on key frames and intraframes. Depending on your work flow, codecs that don't operate on keyframes/intraframes will actually provide mpv the capability of playing backwards at full speed (eg: rawvideo, ffv1, magicyuv...).

Re: Mpv – A free, open-source, and cross-platform media player

#188

Post by chungy »

dbcooper wrote: post #82

What are the best upscalers for MPV these days?

I default on ewa_lanczossharp; it does pretty well at upscaling normal SD video to modern resolutions.

I also often use oversample, for video game footage and whatnot where I want all the pixels to be not blurry.

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