Commits on Jun 13, 2024

1. vf_vapoursynth: upgrade to VapourSynth API v4 …

   VapourSynth introduced their version 4 API in R55, 3 years ago. mpv is
   still using the deprecated version 3. I think it is good to migrate
   before VapourSynth completely removes it.
   
   The most impacted area is the video format. Previously we have a fixed
   table of supported formats, each represented by an integer. In v4, the
   integer is replaced by pointer to the full struct of the format.
   
   Second, the way to create video filter is changed. Previously caller
   needs to supply a "initialization" callback to `createFilter()`, which
   sets up video info etc. In v4, video info is prepared first, passed to
   the `createVideoFilter2()` and we get back the node.
   
   Also, previously mpv was using the `fmSerial` filter mode, which means
   VapourSynth 1) can only request one frame from mpv at a time, and 2) the
   order of frames requested must be sequential. I propose to change it to
   the parallel request mode, which requests multiple frames at a time in
   semi random order. The reasons are, for 1), the get frame function,
   `infiltGetFrame()`, unlocks the mutex during output image generation,
   thus can benefit from parallel requests. For 2) thanks to the frame
   buffer, unordered frame requests are acceptable. Just make sure the
   buffer is large enough.
   
   Third, the way VapourSynth scripting environment works change. In v4,
   the scripting API is operated through struct pointer, much like the
   exist `vsapi` pointer. The "finalize" function is also no longer needed.

   

   CrendKing committed Jun 13, 2024
   Configuration menu

   • View commit details
   • Copy full SHA for ba652cd
   • Browse repository at this point

   Copy the full SHA

   ba652cd View commit details

   Browse the repository at this point in the history