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vo_opengl_cb: fix video timing somewhat

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Increase the default queue size. This helps with "missed" frames due to
the asynchronous nature of the API. All the other VOs are synchronous,
so if rendering and displaying takes a while, the common code in vo.c
will be blocked until it can continue. But with opengl-cb, vo.c might
immediately push the next ready frame, which causes the current frame
to be dropped _if_ it wasn't rendered yet.

One could fix this by making vo.c wait a while (until the API user calls
the render function, which pulls the frame). But setting the default
queue size to 2 seems much simpler: instead of dropping the frame, it
will be pushed to the API user once the next renderer call finishes.

(This is still a bit strange, and will hopefully be cleaned up when
video scheduling is redone, but for now this appears to deliver
relatively good results.)
This commit is contained in:
wm4 2015-04-09 19:22:54 +02:00
parent 11556e0530
commit 4e8ee522f4
1 changed files with 2 additions and 2 deletions
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4
video/out/vo_opengl_cb.c
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@ -405,7 +405,7 @@ static int reconfig(struct vo *vo, struct mp_image_params *params, int flags)
#define OPT_BASE_STRUCT struct vo_priv
static const struct m_option change_opts[] = {
OPT_FLAG("debug", use_gl_debug, 0),
OPT_INTRANGE("frame-queue-size", frame_queue_size, 0, 1, 100, OPTDEF_INT(1)),
OPT_INTRANGE("frame-queue-size", frame_queue_size, 0, 1, 100, OPTDEF_INT(2)),
OPT_CHOICE("frame-drop-mode", frame_drop_mode, 0,
({"pop", FRAME_DROP_POP},
{"clear", FRAME_DROP_CLEAR})),
@ -531,7 +531,7 @@ static int preinit(struct vo *vo)
#define OPT_BASE_STRUCT struct vo_priv
static const struct m_option options[] = {
OPT_FLAG("debug", use_gl_debug, 0),
OPT_INTRANGE("frame-queue-size", frame_queue_size, 0, 1, 100, OPTDEF_INT(1)),
OPT_INTRANGE("frame-queue-size", frame_queue_size, 0, 1, 100, OPTDEF_INT(2)),
OPT_CHOICE("frame-drop-mode", frame_drop_mode, 0,
({"pop", FRAME_DROP_POP},
{"clear", FRAME_DROP_CLEAR})),