Issue with h264depay and avdec_h264 when using rtpulpfecenc/dec !

nithin_pradeep nithin at riversilica.com
Mon Aug 6 05:43:54 UTC 2018


Hello All,

I am currently working on adding elements *rtpulpfecenc* and *rtpulpfecdec
*to my sender and receiver pipelines respectively. The example program for
these were written in rust and uses *rtpvp8pay /depay* along with *vp8enc
*and *vp8dec *. Since my application is only compatible with
*rtph264pay/depay* ,I have used ,
*Sender:*
filesrc >> decodebin >> videoconvert >> queue >> rtph264pay >> Queue >>
rtpbin ( rtpulpfecenc > rtpsession ) >> udpsink
*Receiver :*
udpsrc>> netsim >>rtpbin ( funnel > rtpsession > rtpstorage > rtpssrcdemux >
rtpjitterbuffer > rtpptdemux > rtpulpfecdec ) >> rtph264depay >> h264parse
>> capsfilter >> *decodebin *>>videoconvert >> videoscale >> capsfilter >>
x264enc >> matroskamux >> filesink

I am setting the fec percentage as 10 on sender and drop as 1 % on receiver
side , I am getting the ratio of packets unrecovered : recovered , But Issue
is that decode bin at the receiver side uses *avdec_h264 *internally as
decoder , it is producing the following errors,

/0:00:09.053600607 26017 0x7f7f6c003230 ERROR libav :0:: {] Missing
reference picture, default is 0
0:00:09.053652680 26017 0x7f7f6c003230 ERROR libav :0:: {]
decode_slice_header error
0:00:09.118489816 26017 0x7f7f6c003230 ERROR libav :0:: {] Missing reference
picture, default is 2
0:00:09.641810087 26017 0x7f7f6c003230 ERROR libav :0:: {]
decode_slice_header error
0:00:09.657737341 26017 0x7f7f6c003230 ERROR libav :0:: {] Missing
reference/

Attached below is the logs related to the same :
log_with_decode_bin_ERROR_.txt
<http://gstreamer-devel.966125.n4.nabble.com/file/t378456/log_with_decode_bin_ERROR_.txt>  

The Dot diagram for the following is also attached :
*SERVER:*
<http://gstreamer-devel.966125.n4.nabble.com/file/t378456/server_h264.png> 
*CLIENT:*
<http://gstreamer-devel.966125.n4.nabble.com/file/t378456/client_h264.png> 

/
Is there any elements that I need to add when i use other pay/depay instead
of VP8 ,or is this because of any wrong configuration? /
Please Help me with this situation,
*Eagerly Waiting for a response.*

Regards,
/Nithin Pradeep./





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