<div dir="ltr"><div><div><div>on Wed, 02 Nov 2016 09:50:31 +0200, Sebastian Dröge wrote: > Maybe you'd like to use the splitmuxsink element (and then splitmuxsrc) > for generating your files? Alternatively you will have to demux them > (all in one pipeline) and mux them again with (the same) mp4mux. </div>Thank you! So, I write some chunks using splitmuxsink. Chunks are valid and have correct pts, pts_time, dts, dts_time, duration and duration_time for each packet. sonntex@home ~/video0 $ ls -l total 3696 -rw-r--r-- 1 sonntex sonntex 1890215 Nov 18 16:58 video-chunk-00.mp4 -rw-r--r-- 1 sonntex sonntex 1891161 Nov 18 16:58 video-chunk-01.mp4 sonntex@home ~/video0 $ ffprobe -show_packets video-chunk-01.mp4 2>&1 | tail -n 30 [PACKET] codec_type=video stream_index=0 pts=124771 pts_time=12.477100 dts=124771 dts_time=12.477100 duration=98 duration_time=0.009800 convergence_duration=N/A convergence_duration_time=N/A size=10329 pos=1866712 flags=_ [/PACKET] [PACKET] codec_type=video stream_index=0 pts=124869 pts_time=12.486900 dts=124869 dts_time=12.486900 duration=697 duration_time=0.069700 convergence_duration=N/A convergence_duration_time=N/A size=10478 pos=1877041 flags=_ [/PACKET] </div><div>But result of the merge is incorrect! </div><div> sonntex@home ~/video0 $ GST_DEBUG=3 gst-launch-1.0 splitmuxsrc location="video-chunk-*.mp4" ! splitmuxsink location="video.mp4" Setting pipeline to PAUSED ... 0:00:00.010555250 29243 0x1a28500 WARN basesrc gstbasesrc.c:3491:gst_base_src_start_complete:<filesrc0> pad not activated yet 0:00:00.012274605 29243 0x7fc71c0200f0 WARN qtdemux qtdemux.c:2886:qtdemux_parse_trex:<qtdemux0> failed to find fragment defaults for stream 1 0:00:00.012340497 29243 0x7fc71c0200f0 WARN basesrc gstbasesrc.c:2400:gst_base_src_update_length:<filesrc0> processing at or past EOS 0:00:00.013333616 29243 0x1a28500 WARN basesrc gstbasesrc.c:3491:gst_base_src_start_complete:<filesrc1> pad not activated yet 0:00:00.014049112 29243 0x19150f0 WARN qtdemux qtdemux.c:2886:qtdemux_parse_trex:<qtdemux1> failed to find fragment defaults for stream 1 0:00:00.014108777 29243 0x19150f0 WARN basesrc gstbasesrc.c:2400:gst_base_src_update_length:<filesrc1> processing at or past EOS Pipeline is PREROLLING ... 0:00:00.015955797 29243 0x7fc71c020370 FIXME basesink gstbasesink.c:3077:gst_base_sink_default_event:<sink> stream-start event without group-id. Consider implementing group-id handling in the upstream elements Pipeline is PREROLLED ... Setting pipeline to PLAYING ... 0:00:00.016233204 29243 0x1a28500 WARN bin gstbin.c:2796:gst_bin_do_latency_func:<pipeline0> did not really configure latency of 0:00:00.000000000 New clock: GstSystemClock Got EOS from element "pipeline0". Execution ended after 0:00:00.006390800 Setting pipeline to PAUSED ... Setting pipeline to READY ... Setting pipeline to NULL ... Freeing pipeline ... sonntex@home ~/video0 $ ls -l total 7372 -rw-r--r-- 1 sonntex sonntex 1890215 Nov 18 16:58 video-chunk-00.mp4 -rw-r--r-- 1 sonntex sonntex 1891161 Nov 18 16:58 video-chunk-01.mp4 -rw-r--r-- 1 sonntex sonntex 3761145 Nov 18 21:20 video.mp4 sonntex@home ~/video0 $ ffprobe -show_packets video.mp4 2>&1 | tail -n 30 [PACKET] codec_type=video stream_index=0 pts=124416 pts_time=24.883200 dts=124416 dts_time=24.883200 duration=652 duration_time=0.130400 convergence_duration=N/A convergence_duration_time=N/A size=10139 pos=3734207 flags=_ [/PACKET] [PACKET] codec_type=video stream_index=0 pts=125068 pts_time=25.013600 dts=125068 dts_time=25.013600 duration=49 duration_time=0.009800 convergence_duration=N/A convergence_duration_time=N/A size=10329 pos=3744346 flags=_ [/PACKET] </div>As you can see, pts, dts and duration do not correspond to pts_time, dts_time and duration_time. It is not a problem for VLC in some cases, but I have one usb camera for which VLC does not work. Chunks are also valid and have correct pts, pts_time, dts, dts_time, duration and duration_time for each packet. sonntex@home ~/video1 $ ls -l total 132 -rw-r--r-- 1 sonntex sonntex 67913 Nov 18 17:32 video-chunk-00.mp4 -rw-r--r-- 1 sonntex sonntex 62051 Nov 18 17:32 video-chunk-01.mp4 sonntex@home ~/video1 $ ffprobe -show_packets video-chunk-01.mp4 2>&1 | tail -n 30 [PACKET] codec_type=video stream_index=0 pts=145692 pts_time=14.569200 dts=145692 dts_time=14.569200 duration=130 duration_time=0.013000 convergence_duration=N/A convergence_duration_time=N/A size=12 pos=54537 flags=_ [/PACKET] [PACKET] codec_type=video stream_index=0 pts=145822 pts_time=14.582200 dts=145822 dts_time=14.582200 duration=1 duration_time=0.000100 convergence_duration=N/A convergence_duration_time=N/A size=12 pos=54549 flags=_ [/PACKET] Result of the merge is incorrect too! But, probably, there are overflows and some of the values are negative (not for each packet). It's enough for VLC to not play this file. sonntex@home ~/video1 $ GST_DEBUG=3 gst-launch-1.0 splitmuxsrc location="video-chunk-*.mp4" ! splitmuxsink location="video.mp4" Setting pipeline to PAUSED ... 0:00:00.010366521 29326 0xaf6500 WARN basesrc gstbasesrc.c:3491:gst_base_src_start_complete:<filesrc0> pad not activated yet 0:00:00.012163232 29326 0x7f63a00200f0 WARN qtdemux qtdemux.c:2886:qtdemux_parse_trex:<qtdemux0> failed to find fragment defaults for stream 1 0:00:00.012269707 29326 0x7f63a00200f0 WARN basesrc gstbasesrc.c:2400:gst_base_src_update_length:<filesrc0> processing at or past EOS 0:00:00.013142921 29326 0xaf6500 WARN basesrc gstbasesrc.c:3491:gst_base_src_start_complete:<filesrc1> pad not activated yet 0:00:00.013882447 29326 0x9e30f0 WARN qtdemux qtdemux.c:2886:qtdemux_parse_trex:<qtdemux1> failed to find fragment defaults for stream 1 0:00:00.013956282 29326 0x9e30f0 WARN basesrc gstbasesrc.c:2400:gst_base_src_update_length:<filesrc1> processing at or past EOS Pipeline is PREROLLING ... 0:00:00.015247807 29326 0x7f63a0020370 FIXME basesink gstbasesink.c:3077:gst_base_sink_default_event:<sink> stream-start event without group-id. Consider implementing group-id handling in the upstream elements Pipeline is PREROLLED ... Setting pipeline to PLAYING ... 0:00:00.015483003 29326 0xaf6500 WARN bin gstbin.c:2796:gst_bin_do_latency_func:<pipeline0> did not really configure latency of 0:00:00.000000000 New clock: GstSystemClock Got EOS from element "pipeline0". Execution ended after 0:00:00.008565126 Setting pipeline to PAUSED ... Setting pipeline to READY ... Setting pipeline to NULL ... Freeing pipeline ... sonntex@home ~/video1 $ ls -l total 260 -rw-r--r-- 1 sonntex sonntex 67913 Nov 18 17:32 video-chunk-00.mp4 -rw-r--r-- 1 sonntex sonntex 62051 Nov 18 17:32 video-chunk-01.mp4 -rw-r--r-- 1 sonntex sonntex 130286 Nov 18 21:29 video.mp4 sonntex@home ~/video1 $ ffprobe -show_packets video.mp4 2>&1 | tail -n 30 [PACKET] codec_type=video stream_index=0 pts=-161503839 pts_time=-140438.120870 dts=-161503839 dts_time=-140438.120870 duration=1 duration_time=0.000870 convergence_duration=N/A convergence_duration_time=N/A size=12 pos=114820 flags=_ [/PACKET] [PACKET] codec_type=video stream_index=0 pts=-161503775 pts_time=-140438.065217 dts=-161503775 dts_time=-140438.065217 duration=1 duration_time=0.000870 convergence_duration=N/A convergence_duration_time=N/A size=12 pos=114832 flags=_ [/PACKET] </div>I wrote you so many logs to show that the same problem can occur in very different ways.</div>