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assrender: For synchronizing the text, take the video running time of the next frame
This makes sure that libass already has all text buffers for the next frame at the time when the next frame is processed. Without this text buffers might be one frame late or not shown at all if they're only shown for a single frame.
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2 changed files with 7 additions and 1 deletions
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@ -651,7 +651,8 @@ gst_ass_render_setcaps_video (GstPad * pad, GstCaps * caps)
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render->height = 0;
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if (!gst_video_format_parse_caps (caps, &render->format, &render->width,
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&render->height)) {
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&render->height) ||
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!gst_video_parse_caps_framerate (caps, &render->fps_n, &render->fps_d)) {
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GST_ERROR_OBJECT (render, "Can't parse caps: %" GST_PTR_FORMAT, caps);
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ret = FALSE;
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goto out;
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@ -963,6 +964,10 @@ gst_ass_render_chain_text (GstPad * pad, GstBuffer * buffer)
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gst_segment_to_running_time (&render->video_segment, GST_FORMAT_TIME,
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render->video_segment.last_stop);
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if (render->fps_n && render->fps_d)
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vid_running_time +=
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gst_util_uint64_scale (GST_SECOND, render->fps_d, render->fps_n);
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if (sub_running_time > vid_running_time) {
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g_assert (render->subtitle_pending == NULL);
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g_mutex_lock (render->subtitle_mutex);
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@ -55,6 +55,7 @@ struct _GstAssRender
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GstVideoFormat format;
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gint width, height;
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gint fps_n, fps_d;
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GstAssRenderBlitFunction blit;
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GMutex *subtitle_mutex;
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