MPEG transport stream, H264 decoding and playback speed
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MPEG transport stream, H264 decoding and playback speed
 
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Hi all,
I am having an issue with the speed of playback of an MPEG transport stream. This is running on a TI 8148 EVM. One pipeline is used to produce a test pattern, do H264 encoding, wrap it in an MPEG transport stream and then write it to a file. A second pipeline is then used to read the file, demux the video stream, do the H264 decoding and play the video on the LCD display. The video looks ok but it is going too fast. The test pattern was generated at 30 frames a second and the output is played at 60 frames a second. The transport stream has presentation timestamps that look accurate for 30 frames a second. It was assumed that these timestamps would be used in the decode and play but it doesn't seem to be happening. Is there a parameter needed or a special element needed in order to pay attention to the timestamps and just play the frames at the same rate they were produced? The recording pipeline and the output from "gstperf" which shows how many frames are being processed: ================================= root@dm814x-evm:~# gst-launch videotestsrc num-buffers=600 is-live=true do-timestamp=true ! video/x-raw-yuv,format='(fourcc)NV12 ',width=400,height=240,framerate=30/1 ! gstperf ! timeoverlay auto-resize="0" shaded-background=true ! omx_h264enc profile=2 for ce-idr-period=4 bytestream=true ! mpegtsmux ! filesink location=jwp.600.30.4.idr.264.ts Setting pipeline to PAUSED ... Pipeline is live and does not need PREROLL ... Setting pipeline to PLAYING ... New clock: GstSystemClock perf0: frames: 32 current: 30.98 average: 30.98 arm-load: 16 perf0: frames: 63 current: 30.02 average: 30.50 arm-load: 79 perf0: frames: 93 current: 29.99 average: 30.33 arm-load: 80 perf0: frames: 124 current: 29.99 average: 30.25 arm-load: 81 perf0: frames: 155 current: 30.01 average: 30.20 arm-load: 79 perf0: frames: 185 current: 29.99 average: 30.17 arm-load: 80 perf0: frames: 216 current: 30.01 average: 30.14 arm-load: 80 perf0: frames: 246 current: 30.00 average: 30.13 arm-load: 80 perf0: frames: 276 current: 29.99 average: 30.11 arm-load: 85 perf0: frames: 307 current: 30.01 average: 30.10 arm-load: 82 perf0: frames: 337 current: 30.00 average: 30.09 arm-load: 79 perf0: frames: 367 current: 29.98 average: 30.08 arm-load: 77 perf0: frames: 398 current: 30.00 average: 30.08 arm-load: 77 perf0: frames: 429 current: 30.00 average: 30.07 arm-load: 77 perf0: frames: 459 current: 29.99 average: 30.07 arm-load: 78 perf0: frames: 489 current: 30.00 average: 30.06 arm-load: 79 perf0: frames: 520 current: 30.01 average: 30.06 arm-load: 77 perf0: frames: 551 current: 29.99 average: 30.06 arm-load: 74 perf0: frames: 582 current: 30.02 average: 30.05 arm-load: 79 Recieved EOS event, press <CTRL+C> to terminate pipeline. Got EOS from element "pipeline0". Execution ended after 19996928300 ns. Setting pipeline to PAUSED ... Setting pipeline to READY ... Setting pipeline to NULL ... Freeing pipeline ... root@dm814x-evm:~# ================================= The playback pipeline and output: ================================== root@dm814x-evm:~# gst-launch filesrc location=jwp.600.30.4.idr.264.ts ! mpegtsdemux ! queue ! h264parse access-unit=true ! omx _h264dec use-timestamps=true ! gstperf ! omx_scaler ! video/x-raw-yuv,width=800,height=480 ! omx_ctrl display-mode=OMX_DC_MODE _1080P_60 display-device=LCD ! omx_videosink sync=false display-device=LCD Setting pipeline to PAUSED ... Pipeline is PREROLLING ... (gst-launch-0.10:1481): GStreamer-CRITICAL **: _gst_util_uint64_scale_int: assertion `denom > 0' failed Pipeline is PREROLLED ... Setting pipeline to PLAYING ... New clock: GstSystemClock perf0: frames: 61 current: 60.59 average: 60.59 arm-load: 13 perf0: frames: 122 current: 60.25 average: 60.42 arm-load: 10 perf0: frames: 183 current: 60.26 average: 60.37 arm-load: 9 perf0: frames: 244 current: 60.26 average: 60.34 arm-load: 8 perf0: frames: 305 current: 60.26 average: 60.32 arm-load: 11 perf0: frames: 366 current: 60.26 average: 60.31 arm-load: 14 perf0: frames: 427 current: 60.26 average: 60.30 arm-load: 13 perf0: frames: 488 current: 60.26 average: 60.30 arm-load: 12 perf0: frames: 549 current: 60.26 average: 60.29 arm-load: 19 Recieved EOS event, press <CTRL+C> to terminate pipeline. Recieved EOS event, press <CTRL+C> to terminate pipeline. Got EOS from element "pipeline0". Execution ended after 9703074850 ns. Setting pipeline to PAUSED ... Setting pipeline to READY ... Setting pipeline to NULL ... Freeing pipeline ... root@dm814x-evm:~# ================================== Any suggestions as to arguments that might fix this would be appreciated. Thanks. John Pruitt _______________________________________________ gstreamer-devel mailing list [hidden email] http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: MPEG transport stream, H264 decoding and playback speed
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On Thu, 2012-10-04 at 15:59 -0400, John Pruitt wrote:
Hi, > root@dm814x-evm:~# gst-launch filesrc location=jwp.600.30.4.idr.264.ts ! mpegtsdemux ! queue ! h264parse access-unit=true ! omx > _h264dec use-timestamps=true ! gstperf ! omx_scaler ! video/x-raw-yuv,width=800,height=480 ! omx_ctrl display-mode=OMX_DC_MODE > _1080P_60 display-device=LCD ! omx_videosink sync=false display-device=LCD Perhaps I didn't read your post carefully enough, but just be sure: sync=false on the sink typically disables syncing against the clock according to the timestamps, instead outputting the data as fast as possible. Not sure if that's on purpose or not. > (gst-launch-0.10:1481): GStreamer-CRITICAL **: _gst_util_uint64_scale_int: assertion `denom > 0' failed That's not good, you should investigate where that comes from and fix it (with G_DEBUG=fatal_warnings plus a debugger). Cheers -Tim _______________________________________________ gstreamer-devel mailing list [hidden email] http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: MPEG transport stream, H264 decoding and playback speed
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Thanks Tim. Using sync=true fixed the pacing issue. Still looking into the other issue.
John Pruitt Critical Link, LLC 315.425.4045 x287 On Thu, Oct 4, 2012 at 4:15 PM, Tim-Philipp Müller <[hidden email]> wrote: On Thu, 2012-10-04 at 15:59 -0400, John Pruitt wrote: _______________________________________________ gstreamer-devel mailing list [hidden email] http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
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