#800 make it possible to disable b-frames from the client using the s…

…ame XPRA_B_FRAMES env var

git-svn-id: https://xpra.org/svn/Xpra/trunk@12890 3bb7dfac-3a0b-4e04-842a-767bc560f471

src/xpra/client/ui_client_base.py

@@ -81,6 +81,7 @@ def add_legacy_names(codecs):
 PAINT_FAULT_RATE = int(os.environ.get("XPRA_PAINT_FAULT_INJECTION_RATE", "0"))
 PAINT_FAULT_TELL = os.environ.get("XPRA_PAINT_FAULT_INJECTION_TELL", "1")=="1"
 
+B_FRAMES = os.environ.get("XPRA_B_FRAMES", "1")=="1"
 
 #LOG_INFO_RESPONSE = ("^window.*position", "^window.*size$")
 LOG_INFO_RESPONSE = os.environ.get("XPRA_LOG_INFO_RESPONSE", "")
@@ -1449,6 +1450,10 @@ def make_hello(self):
             "greedy"                    : CLIPBOARD_GREEDY,
             "set_enabled"               : True,
             })
+        if B_FRAMES:
+            video_b_frames = ["h264"]   #only tested with dec_avcodec2
+        else:
+            video_b_frames = []
         updict(capabilities, "encoding", {
             "flush"                     : True,
             "scaling.control"           : self.video_scaling,
@@ -1457,7 +1462,7 @@ def make_hello(self):
             #TODO: check for csc support (swscale only?)
             "video_reinit"              : True,
             "video_scaling"             : True,
-            "video_b_frames"            : ["h264"],     #only tested with dec_avcodec2
+            "video_b_frames"            : video_b_frames,
             "webp_leaks"                : False,
             "transparency"              : self.has_transparency(),
             "rgb24zlib"                 : True,