←back to thread

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

(mpv.io)
1113 points Bluestein | 1 comments | 17 Aug 24 18:56 UTC | HN request time: 0.214s | source
Show context
lairv ◴[17 Aug 24 21:38 UTC] No.41278203[source]▶
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
replies(19): >>41278382 #>>41278499 #>>41278639 #>>41278719 #>>41279342 #>>41279364 #>>41279561 #>>41279827 #>>41279842 #>>41279920 #>>41280125 #>>41281214 #>>41281733 #>>41282953 #>>41283275 #>>41284169 #>>41287180 #>>41289348 #>>41289743 #
sergiotapia ◴[17 Aug 24 22:06 UTC] No.41278382[source]▶
i wonder why he's such an ass about it, and totally adamant that it's impossible when multiple players already do this fast. ego?
replies(4): >>41278485 #>>41278542 #>>41278658 #>>41278802 #
mannyv ◴[17 Aug 24 22:30 UTC] No.41278542[source]▶
To do this well you need to keep the old frames around...or go back to the previous keyframe and re-render. That might be hard if your design is playback-optimized.
replies(3): >>41278621 #>>41279096 #>>41281533 #
1. DonHopkins ◴[18 Aug 24 10:46 UTC] No.41281533[source]▶
Again: There is no reason to start caching previous frames until AFTER the user has paused and pressed the "back frame" key. Only THEN does it need to rewind to the previous i-frame and re-render and cache frames. And there is no measurable cost to remembering the timestamp of the last i-frame, so you know where to rewind to.