msg: reinterpret a bunch of message levels

I've decided that MP_TRACE means “noisy spam per frame”, whereas
MP_DBG just means “more verbose debugging messages than MSGL_V”.
Basically, MSGL_DBG shouldn't create spam per frame like it currently
does, and MSGL_V should make sense to the end-user and provide mostly
additional informational output.

MP_DBG is basically what I want to make the new default for --log-file,
so the cut-off point for MP_DBG is if we probably want to know if for
debugging purposes but the user most likely doesn't care about on the
terminal.

Also, the debug callbacks for libass and ffmpeg got bumped in their
verbosity levels slightly, because being external components they're a
bit less relevant to mpv debugging, and a bit too over-eager in what
they consider to be relevant information.

I exclusively used the "try it on my machine and remove messages from
MSGL_* until it does what I want it to" approach of refactoring, so
YMMV.

1 files changed, 3 insertions, 3 deletions

diff --git a/video/filter/vf_vapoursynth.c b/video/filter/vf_vapoursynth.c
index 3ed3c01969..b5aad7abbf 100644
--- a/video/filter/vf_vapoursynth.c
+++ b/video/filter/vf_vapoursynth.c
@@ -260,7 +260,7 @@ static void VS_CC vs_frame_done(void *userData, const VSFrameRef *f, int n,
     // If these assertions fail, n is an unrequested frame (or filtered twice).
     assert(n >= p->out_frameno && n < p->out_frameno + p->max_requests);
     int index = n - p->out_frameno;
-    MP_DBG(vf, "filtered frame %d (%d)\n", n, index);
+    MP_TRACE(vf, "filtered frame %d (%d)\n", n, index);
     assert(p->requested[index] == &dummy_img);
 
     struct mp_image *res = NULL;
@@ -328,7 +328,7 @@ static bool locked_read_output(struct vf_instance *vf)
             //       infiltGetFrame (if it does, we would deadlock)
             p->requested[n] = (struct mp_image *)&dummy_img;
             p->failed = false;
-            MP_DBG(vf, "requesting frame %d (%d)\n", p->out_frameno + n, n);
+            MP_TRACE(vf, "requesting frame %d (%d)\n", p->out_frameno + n, n);
             p->vsapi->getFrameAsync(p->out_frameno + n, p->out_node,
                                     vs_frame_done, vf);
         }
@@ -463,7 +463,7 @@ static const VSFrameRef *VS_CC infiltGetFrame(int frameno, int activationReason,
     VSFrameRef *ret = NULL;
 
     pthread_mutex_lock(&p->lock);
-    MP_DBG(vf, "VS asking for frame %d (at %d)\n", frameno, p->in_frameno);
+    MP_TRACE(vf, "VS asking for frame %d (at %d)\n", frameno, p->in_frameno);
     while (1) {
         if (p->shutdown) {
             p->vsapi->setFilterError("EOF or filter reinit/uninit", frameCtx);