<div style="line-height:1.7;color:#000000;font-size:14px;font-family:arial">Hi:<div>&nbsp; &nbsp; I am compliting the gstremer,when i run "gst-launch -v playbin2 uri=file:///sdcard/b.mp4",there are some errors.Could you help me ?</div><div><br></div><div><div><br></div><div>/GstPlayBin2:playbin20/GstURIDecodeBin:uridecodebin0: connection-speed = 0</div><div>/GstPlayBin2:playbin20/GstURIDecodeBin:uridecodebin0: source = (GstFileSrc) source</div><div>/GstPlayBin2:playbin20/GstURIDecodeBin:uridecodebin0/GstDecodeBin2:decodebin20/GstTypeFindElement:typefind.GstPad:src: caps = video/quicktime, variant=(string)iso</div><div>Pipeline is PREROLLING ...</div><div>/GstPlayBin2:playbin20/GstURIDecodeBin:uridecodebin0/GstDecodeBin2:decodebin20/GstQTDemux:qtdemux0.GstPad:sink: caps = video/quicktime, variant=(string)iso</div><div>Missing element: MPEG-4 Video decoder</div><div>WARNING: from element /GstPlayBin2:playbin20/GstURIDecodeBin:uridecodebin0: No decoder available for type 'video/mpeg, mpegversion=(int)4, parsed=(boolean)true, systemstream=(boolean)false'.</div><div>Additional debug info:</div><div>/opt/gstreamer/external/gstreamer_aggregate/gst-plugins-base/gst/playback/gsturidecodebin.c(867): unknown_type_cb (): /GstPlayBin2:playbin20/GstURIDecodeBin:uridecodebin0</div></div><div><br></div><div><br></div><div>Thank you.</div><div>Bill</div></div><br><br><span title="neteasefooter"><span id="netease_mail_footer"></span></span>