[Spice-devel] [PATCH v7 15/23] server: Cap the VP8 and h264 video quality to limit the bit rate

[Francois Gouget]

This prevents the bit rate from going insanely high on fast networks
for no visible video quality improvement.

Signed-off-by: Francois Gouget <fgouget at codeweavers.com>
---
 server/gstreamer-encoder.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/server/gstreamer-encoder.c b/server/gstreamer-encoder.c
index bf60773..3c1e86e 100644
--- a/server/gstreamer-encoder.c
+++ b/server/gstreamer-encoder.c
@@ -806,6 +806,7 @@ static gboolean configure_pipeline(SpiceGstEncoder *encoder,
 #endif
         g_object_set(G_OBJECT(encoder->gstenc),
                      "resize-allowed", TRUE, /* for very low bit rates */
+                     "min-quantizer", 10, /* seems virtually lossless */
                      "target-bitrate", encoder->video_bit_rate,
                      "end-usage", 1, /* CBR */
                      "lag-in-frames", 0, /* zero-frame latency */
@@ -818,6 +819,7 @@ static gboolean configure_pipeline(SpiceGstEncoder *encoder,
     case SPICE_VIDEO_CODEC_TYPE_H264:
         g_object_set(G_OBJECT(encoder->gstenc),
                      "bitrate", encoder->video_bit_rate / 1024,
+                     "qp-min", 15, /* virtually lossless */
                      "byte-stream", TRUE,
                      "aud", FALSE,
                      "tune", 4, /* zero-frame latency */
-- 
2.6.2