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vp[89]enc: Don't set timebase from the framerate

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The framerate very often is just an indication of the ideal framerate, not the
actual framerate of the stream. By just using the framerate, we confuse the
rate control algorithm algorithm as multiple frames will map to the same PTS
or have durations of 0.

https://bugzilla.gnome.org/show_bug.cgi?id=749122
This commit is contained in:
Sebastian Dröge 2015-05-11 13:33:26 +03:00
parent 692df969ea
commit eb365cc3bb
2 changed files with 0 additions and 20 deletions
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10
ext/vpx/gstvp8enc.c
View file

@ -1540,22 +1540,12 @@ gst_vp8_enc_set_format (GstVideoEncoder * video_encoder,
GST_DEBUG_OBJECT (video_encoder, "Using timebase configuration");
encoder->cfg.g_timebase.num = encoder->timebase_n;
encoder->cfg.g_timebase.den = encoder->timebase_d;
} else if (GST_VIDEO_INFO_FPS_D (info) != 0
&& GST_VIDEO_INFO_FPS_N (info) != 0) {
/* GstVideoInfo holds either the framerate or max-framerate (if framerate
* is 0) in FPS so this will be used if max-framerate or framerate
* is set */
GST_DEBUG_OBJECT (video_encoder, "Setting timebase from framerate");
encoder->cfg.g_timebase.num = GST_VIDEO_INFO_FPS_D (info);
encoder->cfg.g_timebase.den = GST_VIDEO_INFO_FPS_N (info);
} else {
/* Zero framerate and max-framerate but still need to setup the timebase to avoid
* a divide by zero error. Presuming the lowest common denominator will be RTP -
* VP8 payload draft states clock rate of 90000 which should work for anyone where
* FPS < 90000 (shouldn't be too many cases where it's higher) though wouldn't be optimal. RTP specification
* http://tools.ietf.org/html/draft-ietf-payload-vp8-01 section 6.3.1 */
GST_WARNING_OBJECT (encoder,
"No timebase and zero framerate setting timebase to 1/90000");
encoder->cfg.g_timebase.num = 1;
encoder->cfg.g_timebase.den = 90000;
}

10
ext/vpx/gstvp9enc.c
View file

@ -1513,22 +1513,12 @@ gst_vp9_enc_set_format (GstVideoEncoder * video_encoder,
GST_DEBUG_OBJECT (video_encoder, "Using timebase configuration");
encoder->cfg.g_timebase.num = encoder->timebase_n;
encoder->cfg.g_timebase.den = encoder->timebase_d;
} else if (GST_VIDEO_INFO_FPS_D (info) != 0
&& GST_VIDEO_INFO_FPS_N (info) != 0) {
/* GstVideoInfo holds either the framerate or max-framerate (if framerate
* is 0) in FPS so this will be used if max-framerate or framerate
* is set */
GST_DEBUG_OBJECT (video_encoder, "Setting timebase from framerate");
encoder->cfg.g_timebase.num = GST_VIDEO_INFO_FPS_D (info);
encoder->cfg.g_timebase.den = GST_VIDEO_INFO_FPS_N (info);
} else {
/* Zero framerate and max-framerate but still need to setup the timebase to avoid
* a divide by zero error. Presuming the lowest common denominator will be RTP -
* VP9 payload draft states clock rate of 90000 which should work for anyone where
* FPS < 90000 (shouldn't be too many cases where it's higher) though wouldn't be optimal. RTP specification
* http://tools.ietf.org/html/draft-ietf-payload-vp9-01 section 6.3.1 */
GST_WARNING_OBJECT (encoder,
"No timebase and zero framerate setting timebase to 1/90000");
encoder->cfg.g_timebase.num = 1;
encoder->cfg.g_timebase.den = 90000;
}