[gstreamer-bugs] [Bug 582575] New: [rtph263depay] dropping only part of key frames on lost fragmets
bugzilla-daemon at bugzilla.gnome.org
Thu May 14 00:39:30 PDT 2009
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GStreamer | gst-plugins-good | Ver: git
Summary: [rtph263depay] dropping only part of key frames on lost
AssignedTo: gstreamer-bugs at lists.sourceforge.net
ReportedBy: marco.ballesio at nokia.com
QAContact: gstreamer-bugs at lists.sourceforge.net
GNOME version: Unspecified
GNOME milestone: Unspecified
Please describe the problem:
When an h263 frame fragment is lost the rtph263depayloader is only discarding
the payload received since the beginning of the frame, accepting and sending to
the decoder the following fragments, up to the marker bit, if no other errors
Looking at rfc2190 no explicit rules seem to be defined, but some decoders
could misbehave when receiving such incomplete data. If the rule is to keep as
much infos as possible then the depayloader shouldn't drop the initial part of
Steps to reproduce:
1. Launch an RTP pipeline sending to the local loopback RTP packets generated
with rtph263pay. Dump the sent data with a tee.
2. Tcpdump on the loopback interface.
3. After some seconds, launch an RTP receiving pipeline on the same target
connected, again, to the local loopback and depayloading data with
rtph263depay. Dump the depayloaded data.
4. After some tries you'll catch a depayloading starting on the middle of a key
frame (look at the tcpdump).
The key frame is partially reassembled starting from the first received packet.
They frame should be completely discarded.
Does this happen every time?
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