diff options
| -rw-r--r-- | libavfilter/vf_overlay.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/libavfilter/vf_overlay.c b/libavfilter/vf_overlay.c index 01a829c828..33db9ef180 100644 --- a/libavfilter/vf_overlay.c +++ b/libavfilter/vf_overlay.c @@ -475,7 +475,7 @@ static int try_start_frame(AVFilterContext *ctx, AVFilterBufferRef *mainpic) AVFilterBufferRef *next_overpic, *outpicref; int ret; - /* Discard obsolete overlay frames: if there is a next frame with pts is + /* Discard obsolete overlay frames: if there is a next overlay frame with pts * before the main frame, we can drop the current overlay. */ while (1) { next_overpic = ff_bufqueue_peek(&over->queue_over, 0); @@ -486,12 +486,14 @@ static int try_start_frame(AVFilterContext *ctx, AVFilterBufferRef *mainpic) avfilter_unref_buffer(over->overpicref); over->overpicref = next_overpic; } + /* If there is no next frame and no EOF and the overlay frame is before * the main frame, we can not know yet if it will be superseded. */ if (!over->queue_over.available && !over->overlay_eof && (!over->overpicref || av_compare_ts(over->overpicref->pts, ctx->inputs[OVERLAY]->time_base, mainpic->pts , ctx->inputs[MAIN]->time_base) < 0)) return AVERROR(EAGAIN); + /* At this point, we know that the current overlay frame extends to the * time of the main frame. */ outlink->out_buf = outpicref = avfilter_ref_buffer(mainpic, ~0); |