Hi All, I want to save the incoming RTP payloaded H.264 video data from a live source to a file. The pipelines I use is Sender: gst-launch filesrc location=/home/jyoti/Desktop/h264-aac/alien.mp4 ! qtdemux name=d d. ! queue ! rtph264pay ! udpsink port=5002 Receiver: gst-launch udpsrc caps="application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, profile-level-id=(string)4d4033, sprop-parameter-sets=(string)\"Z01AM5JSAoP2AiAAAAMDACAAAAYR4wZJ\\,aO4CvIA\\=\", payload=(int)96, ssrc=(guint)529574254, clock-base=(guint)940521219, seqnum-base=(guint)11356" port=5002 ! rtph264depay ! ffmux_mp4 ! queue ! filesink location=~/Desktop/test --gst-debug=*:1 The pipeline gives me the following error: ********************************************************************************************************** Setting pipeline to PAUSED ... Pipeline is live and does not need PREROLL ... Setting pipeline to PLAYING ... New clock: GstSystemClock 0:00:02.847065223 15058 0x9359fd8 ERROR ffmpeg :0:: time base not set 0:00:02.847607619 15058 0x9359fd8 ERROR ffmpeg :0:: time base not set 0:00:02.847765092 15058 0x9359fd8 ERROR ffmpeg :0:: time base not set ERROR: from element /GstPipeline:pipeline0/ffmux_mp4:ffmux_mp40: Could not configure supporting library. Additional debug info: gstffmpegmux.c(566): gst_ffmpegmux_collected (): /GstPipeline:pipeline0/ffmux_mp4:ffmux_mp40: Failed to write file header - check codec settings Execution ended after 1604133490 ns. Setting pipeline to PAUSED ... Setting pipeline to READY ... Setting pipeline to NULL ... FREEING pipeline ... ********************************************************************************************************** When I did debug the function "gst_ffmpegmux_collected". I saw that the codec parameters are not set properly in av_write_header() used in gst_ffmpegmux_collected(). * st->codec->time_base.num = 0 and st->codec->time_base.den = 1; * And the st->codec->width = 0 and st->codec->height = 0. So to just have a quick hack I used the capsfilter between rtph264depay and ffmux_mp4 with video caps from sender, the pipeline doesn't quit now but instead throws error messages. And the parameters now are: * st->codec->time_base.num = 1 and st->codec->time_base.den = 24 * And the st->codec->width = 320 and st->codec->height = 240 Receiver's pipeline with capsfilter. gst-launch udpsrc caps="application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, profile-level-id=(string)4d4033, sprop-parameter-sets=(string)\"Z01AM5JSAoP2AiAAAAMDACAAAAYR4wZJ\\,aO4CvIA\\=\", payload=(int)96, ssrc=(guint)529574254, clock-base=(guint)940521219, seqnum-base=(guint)11356" port=5002 ! rtph264depay ! capsfilter caps="video/x-h264, codec_data=(buffer)014d4033ffe10018674d403392520283f6022000000303002000000611e3064901000568ee02bc80, width=(int)320, height=(int)240, framerate=(fraction)24/1" ! ffmux_mp4 ! queue ! filesink location=~/Desktop/test --gst-debug=*:1 **************************************************************************************************************** Setting pipeline to PAUSED ... Pipeline is live and does not need PREROLL ... Setting pipeline to PLAYING ... 0:00:00.252624333 15031 0x857e438 ERROR ffmpeg :0:: error, non monotone timestamps 1 >= 1 0:00:00.293548372 15031 0x857e438 ERROR ffmpeg :0:: error, non monotone timestamps 2 >= 2 0:00:00.335302005 15031 0x857e438 ERROR ffmpeg :0:: error, non monotone timestamps 3 >= 3 0:00:00.376955618 15031 0x857e438 ERROR ffmpeg :0:: error, non monotone timestamps 4 >= 4 0:00:00.418564944 15031 0x857e438 ERROR ffmpeg :0:: error, non monotone timestamps 5 >= 5 0:00:00.460233384 15031 0x857e438 ERROR ffmpeg :0:: error, non monotone timestamps 6 >= 6 0:00:00.502093709 15031 0x857e438 ERROR ffmpeg :0:: error, non monotone timestamps 7 >= 7 0:00:00.543625785 15031 0x857e438 ERROR ffmpeg :0:: error, non monotone timestamps 8 >= 8 0:00:00.585262073 15031 0x857e438 ERROR ffmpeg :0:: error, non monotone timestamps 9 >= 9 0:00:00.626933983 15031 0x857e438 ERROR ffmpeg :0:: error, non monotone timestamps 10 >= 10 0:00:00.668587406 15031 0x857e438 ERROR ffmpeg :0:: error, non monotone timestamps 11 >= 11 0:00:00.710255640 15031 0x857e438 ERROR ffmpeg :0:: error, non monotone timestamps 12 >= 12 0:00:00.752176246 15031 0x857e438 ERROR ffmpeg :0:: error, non monotone timestamps 13 >= 13 0:00:00.793557705 15031 0x857e438 ERROR ffmpeg :0:: error, non monotone timestamps 14 >= 14 0:00:00.835298782 15031 0x857e438 ERROR ffmpeg :0:: error, non monotone timestamps 15 >= 15 0:00:00.877036479 15031 0x857e438 ERROR ffmpeg :0:: error, non monotone timestamps 16 >= 16 0:00:00.877128406 15031 0x857e438 ERROR ffmpeg :0:: error, non monotone timestamps 16 >= 16 **************************************************************************************************************** I would be very greatful if someone can suggest me on how to do. Thanks in advance