Hi, I use the following pipeline: filesrc, decodebin, videoconvert, video/x-raw format=rgb, appsink in my app. This mostly works fine. But I have a .m2v file, which does not call my pad-added callback. Using gst-launch plays the file. The debug out gives me: ... 0:00:05.590319000 1112 0C3F4008 LOG GST_SCHEDULING gstpad.c:3028:probe_hook_marshal:<mpeg2dec0:src> hook 1, cookie 17 with flags 0x00003072 matches 0:00:05.590319000 1112 0C3F4008 LOG decodebin gstdecodebin2.c:3897:source_pad_blocked_cb:<'':decodepad4> blocked: dpad->chain:0C3F5040 0:00:05.590319000 1112 0C3F4008 LOG decodebin gstdecodebin2.c:3901:source_pad_blocked_cb:<decoder> expose locking from thread 0C3F4008 0:00:05.590319000 1112 0C3F4008 LOG decodebin gstdecodebin2.c:3901:source_pad_blocked_cb:<decoder> expose locked from thread 0C3F4008 0:00:05.590319000 1112 0C3F4008 LOG decodebin gstdecodebin2.c:3194:gst_decode_chain_is_complete:<decoder> locking chain 0C131D08 from thread 0C3F4008 0:00:05.590319000 1112 0C3F4008 LOG decodebin gstdecodebin2.c:3194:gst_decode_chain_is_complete:<decoder> locked chain 0C131D08 from thread 0C3F4008 0:00:05.590319000 1112 0C3F4008 DEBUG decodebin gstdecodebin2.c:3177:gst_decode_group_is_complete:<decoder> Group 0C3F1FB0 is complete: 0 0:00:05.590319000 1112 0C3F4008 LOG decodebin gstdecodebin2.c:3214:gst_decode_chain_is_complete:<decoder> unlocking chain 0C131D08 from thread 0C3F4008 0:00:05.590319000 1112 0C3F4008 DEBUG decodebin gstdecodebin2.c:3215:gst_decode_chain_is_complete:<decoder> Chain 0C131D08 is complete: 0 0:00:05.590319000 1112 0C3F4008 LOG decodebin gstdecodebin2.c:3906:source_pad_blocked_cb:<decoder> expose unlocking from thread 0C3F4008 0:00:05.590319000 1112 0C3F4008 DEBUG GST_PADS gstpad.c:3063:probe_hook_marshal:<mpeg2dec0:src> probe returned 1 0:00:05.590319000 1112 0C3F4008 LOG GST_SCHEDULING gstpad.c:3158:do_probe_callbacks:<mpeg2dec0:src> we are blocked 1 times 0:00:05.590319000 1112 0C3F4008 LOG GST_SCHEDULING gstpad.c:3169:do_probe_callbacks:<mpeg2dec0:src> Waiting to be unblocked or set flushing My app does nothing from here. The debug out of gst-lauch has same outout but it follows: 0:00:02.611150000 5552 0706BD38 LOG mpegpsdemux gstmpegdemux.c:2981:gst_flups_demux_combine_flows:<mpegpsdemux0> combined flow return: ok 0:00:02.611150000 5552 0706BD38 LOG GST_BUFFER gstbuffer.c:1410:gst_buffer_map_range: buffer 06F72718, idx 0, length -1, flags 0001 0:00:02.611150000 5552 0706BD38 LOG GST_BUFFER gstbuffer.c:207:_get_merged_memory: buffer 06F72718, idx 0, length 1 0:00:02.611150000 5552 0706BD38 TRACE GST_REFCOUNTING gstminiobject.c:360:gst_mini_object_ref: 0708D078 ref 1->2 0:00:02.611150000 5552 0706BD38 TRACE GST_LOCKING gstminiobject.c:190:gst_mini_object_lock: lock 0708D078: state 00010000, access_mode 1 ... What could be wrong? Hella Aglaia Mobile Vision GmbH Steffen Roeber Firmware & Tools Treskowstr. 14, D-13089 Berlin Amtsgericht Berlin-Charlottenburg HRB 66976 B Geschäftsführer: Kay Talmi Fon: +49 30 200 04 29– 412 Fax: +49 30 200 04 29– 109 Mail: Steffen.Roeber@hella.com URL: <a href="www.aglaia-gmbh.de">www.aglaia-gmbh.de</a> URL: <a href=www.mobilevision.de>www.mobilevision.de</a> Dieses Dokument ist vertraulich zu behandeln. Die Weitergabe sowie Vervielfältigung, Verwertung und Mitteilung seines Inhalts ist nur mit unserer ausdrücklichen Genehmigung gestattet. Alle Rechte vorbehalten, insbesondere für den Fall der Schutzrechtsanmeldung. This document has to be treated confidentially. Its contents are not to be passed on, duplicated, exploited or disclosed without our express permission. All rights reserved, especially the right to apply for protective rights.