I am writing a custom network source (which is actually a source an demux coupled). I my source's sink pad, I am pushing h.264 video (one frame at a time). I am trying the following pipeline with my source. gst-launch mysrc name=src src.vsrc ! queue ! decodebin2 ! autovideosink Sometimes(some 30% of the time) this works without any issue and I can see video. Remaining times I am getting the following error ERROR: from element /GstPipeline:pipeline0/GstDecodeBin2:decodebin20/GstTypeFindElement:typefind: Could not determine type of stream. Additional debug info: gsttypefindelement.c(660): gst_type_find_element_chain_do_typefinding (): /GstPipeline:pipeline0/GstDecodeBin2:decodebin20/GstTypeFindElement:typefind ERROR: pipeline doesn't want to preroll. In my h.264 stream SPS/PPS are going as part of the first frame. And this is always the case. Is there anything I am missing here? Regards KK