In 4:3 PAL, Y41B confuses ffmpeg2theora, and dvswitch PinP

timvideos · Nov 7, 2015 · 510ce94 · mithro · Nov 7, 2015 · 510ce94
1 parent 678131d
commit 510ce94
Showing 1 changed file with 8 additions and 4 deletions.
diff --git a/dvsource-v4l2-other.py b/dvsource-v4l2-other.py
@@ -217,7 +217,7 @@ def launch_gstreamer():
             "videoscale ! video/x-raw,width=720,height=480,pixel-aspect-ratio=\(fraction\)32/27 !",
          "pal-4:3":
             # Convert to 4:3 with non-square pixels (was 59.0/54 ~= 1.09 == ITU-PAR, now 16.0/15 ~= 1.07 == NLE-PAR used by Final Cut / Adobe)
-            # I420 == works, Y41B == works, Y42B == not working
+            # I420 == works, Y41B == works, but has artefacts, Y42B == not working
             "videoscale ! video/x-raw,width=720,height=576,pixel-aspect-ratio=\(fraction\)16/15 !",
          "pal-16:9":
             # Convert to 16:9 with non-square pixels (was 118.0/81 ~= 1.46 == anamorphic 'ITU', now 64.0/45 ~= 1.42 == anamorphic 'NLE')
@@ -233,11 +233,15 @@ def launch_gstreamer():
         }[args.system] +
         " " +
         # Convert to color space needed by dvswitch
-        # For PAL, either I420 or Y41B works.
+        # For PAL, I420 works and Y41B works but has artefacts.
         # For NTSC, only Y41B seems to work.
         # Y42B doesn't seem supported by dvswitch at all.
-        "videoconvert ! video/x-raw,format=\(string\)Y41B !" +
-        " " +
+        "videoconvert ! video/x-raw,format=\(string\)" +
+        {
+            "ntsc": "Y41B",
+            "pal": "I420",
+        }[args.system] +
+        "! " +
         ["", "tee name=t ! "][args.display] +
         " " +
         "queue leaky=downstream max-size-buffers=1 ! " +