[Bug 778934] New: [vp8enc] Using Threads property causes major artifcats

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=778934

            Bug ID: 778934
           Summary: [vp8enc] Using Threads property causes major artifcats
    Classification: Platform
           Product: GStreamer
           Version: 1.10.3
                OS: Mac OS
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: purebordem at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

1.10.3 Mac OS - Installed via Brew

Using the "threads" property causes the encoded video to refuse to play.
Changing "error-resilient" to 1-3 with threads causes the video to play but
incurs intense rainbow artifacting. Tested with various pipelines with varying
degrees of success.

gst-launch-1.0 videotestsrc ! vp8enc ! decodebin ! autovideosink

will play

gst-launch-1.0 videotestsrc ! vp8enc threads=4 ! decodebin ! autovideosink

will not play

gst-launch-1.0 videotestsrc ! vp8enc threads=4 error-resilient=3 ! decodebin !
autovideosink

will play with heavy artifacts

gst-launch-1.0 filesrc location=file.mp4 ! decodebin ! videoconvert ! vp8enc !
decodebin ! autovideosink

will play

gst-launch-1.0 filesrc location=file.mp4 ! decodebin ! videoconvert ! vp8enc
threads=4 ! decodebin ! autovideosink

will not play

gst-launch-1.0 filesrc location=file.mp4 ! decodebin ! videoconvert ! vp8enc !
rtpvp8pay ! udpsink host=127.0.0.1 port=5004

will stream

gst-launch-1.0 filesrc location=file.mp4 ! decodebin ! videoconvert ! vp8enc
threads=4 ! rtpvp8pay ! udpsink host=127.0.0.1 port=5004

will stream

gst-launch-1.0 filesrc location=file.mp4 ! decodebin name=decode ! videoconvert
! vp8enc end-usage=vbr min-quantizer=5 max-quantizer=50 undershoot=95
cpu-used=5 deadline=1 static-threshold=50 error-resilient=1 ! rtpvp8pay !
udpsink host=127.0.0.1 port=5004

will stream without artifacts

gst-launch-1.0 filesrc location=file.mp4 ! decodebin name=decode ! videoconvert
! vp8enc end-usage=vbr min-quantizer=5 max-quantizer=50 undershoot=95
cpu-used=5 threads=4 deadline=1 static-threshold=500 error-resilient=1 !
rtpvp8pay ! udpsink host=127.0.0.1 port=5004

will stream with heavy artifacts


Bottom two streaming examples were viewed in WebRTC compatible browser.

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