rtp client and matroskamux generate stalled webm file

[putrasto]

Hello,

I am trying to stream webm file unmodified video stream (no encode or
decode)
through rtp server and then on client side i mux the video stream and do
file sink to generate webm file.
The problem is the generated webm file on client side will stalled if play
it back for a while (for example stalled after 0:01:26 )

VIDEO_CAPS="application/x-rtp,media=(string)video,clock-rate=(int)90000,encoding-name=(string)VP8"
server script:
gst-launch-1.0 rtpbin name=rtpbin \
           filesrc location=USER002.webm ! matroskademux name=demux
demux.video_0 ! rtpvp8pay ! rtpbin.send_rtp_sink_0          \
                     rtpbin.send_rtp_src_0 ! udpsink host=$DEST port=5000                                
\
                     rtpbin.send_rtcp_src_0 ! udpsink host=$DEST port=5001
sync=true async=false         \
                     udpsrc address=$SRC  port=5005 !
rtpbin.recv_rtcp_sink_0

client script:
gst-launch-1.0 -v -m rtpbin name=rtpbin latency=0  \
udpsrc caps=$VIDEO_CAPS address=localhost port=5000 ! rtpbin.recv_rtp_sink_0
rtpbin. ! rtpvp8depay ! queue ! webmmux name=mux ! \
filesink location=output.webm  udpsrc address=localhost port=5001 ! \
rtpbin.recv_rtcp_sink_0 rtpbin.send_rtcp_src_0 ! udpsink host=localhost
port=5005 sync=true async=false

playback:
./gst-launch-1.0 -v -m filesrc location=output.webm ! decodebin !
autovideosink

here is the message warning during playback when video is stalled (at
0:01:26)

0:01:26.282471000 44883 0x7fcf0f0150f0 WARN            videodecoder
gstvideodecoder.c:2775:void
gst_video_decoder_prepare_finish_frame(GstVideoDecoder *, GstVideoCodecFrame
*, gboolean):<vp8dec0> decreasing timestamp (0:00:26.623000000 <
0:01:32.044000000)
Got message #1072 from element "vp8dec0" (qos): GstMessageQOS,
live=(boolean)false, running-time=(guint64)86127000000,
stream-time=(guint64)86127000000, timestamp=(guint64)92044000000,
duration=(guint64)18446744073709551615, jitter=(gint64)-91310402,
proportion=(double)0.074882353626069847, quality=(int)1000000,
format=(GstFormat)GST_FORMAT_BUFFERS, processed=(guint64)787,
dropped=(guint64)1;
0:01:26.284993000 44883 0x7fcf0f0150f0 WARN            videodecoder
gstvideodecoder.c:2775:void
gst_video_decoder_prepare_finish_frame(GstVideoDecoder *, GstVideoCodecFrame
*, gboolean):<vp8dec0> decreasing timestamp (0:00:26.709000000 <
0:01:32.044000000)
Got message #1074 from element "vp8dec0" (qos): GstMessageQOS,
live=(boolean)false, running-time=(guint64)86127000000,
stream-time=(guint64)86127000000, timestamp=(guint64)92044000000,
duration=(guint64)18446744073709551615, jitter=(gint64)-91310402,
proportion=(double)0.074882353626069847, quality=(int)1000000,
format=(GstFormat)GST_FORMAT_BUFFERS, processed=(guint64)787,
dropped=(guint64)2;
0:01:26.287514000 44883 0x7fcf0f0150f0 WARN            videodecoder
gstvideodecoder.c:2775:void
gst_video_decoder_prepare_finish_frame(GstVideoDecoder *, GstVideoCodecFrame
*, gboolean):<vp8dec0> decreasing timestamp (0:00:26.822000000 <
0:01:32.044000000)
Got message #1076 from element "vp8dec0" (qos): GstMessageQOS,
live=(boolean)false, running-time=(guint64)86127000000,
stream-time=(guint64)86127000000, timestamp=(guint64)92044000000,
duration=(guint64)18446744073709551615, jitter=(gint64)-91310402,
proportion=(double)0.074882353626069847, quality=(int)1000000,
format=(GstFormat)GST_FORMAT_BUFFERS, processed=(guint64)787,
dropped=(guint64)3;
0:01:26.289697000 44883 0x7fcf0f0150f0 WARN            videodecoder
gstvideodecoder.c:2775:void
gst_video_decoder_prepare_finish_frame(GstVideoDecoder *, GstVideoCodecFrame
*, gboolean):<vp8dec0> decreasing timestamp (0:00:26.913000000 <
0:01:32.044000000)
Got message #1078 from element "vp8dec0" (qos): GstMessageQOS,
live=(boolean)false, running-time=(guint64)86127000000,
stream-time=(guint64)86127000000, timestamp=(guint64)92044000000,
duration=(guint64)18446744073709551615, jitter=(gint64)-91310402,
proportion=(double)0.074882353626069847, quality=(int)1000000,
format=(GstFormat)GST_FORMAT_BUFFERS, processed=(guint64)787,
dropped=(guint64)4;
... (repeat almost same warning message until EOS)




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[putrasto]

i think i can solve it but i am not sure what the reason behind it

if i set "max-cluster-duration=1000000000" (i believe this is 1 sec)
to the webmux then the result webm will continuously play.

gst-launch-1.0 -v -m rtpbin name=rtpbin latency=0  \
udpsrc caps=$VIDEO_CAPS address=localhost port=5000 ! rtpbin.recv_rtp_sink_0
rtpbin. ! rtpvp8depay ! queue ! webmmux max-cluster-duration=1000000000
name=mux ! \
filesink location=output.webm  udpsrc address=localhost port=5001 ! \
rtpbin.recv_rtcp_sink_0 rtpbin.send_rtcp_src_0 ! udpsink host=localhost
port=5005 sync=true async=false



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