openshot.bugs team mailing list archive

[dg1727 <1654570@xxxxxxxxxxxxxxxxxx>]

"avprobe" says:

avprobe version 0.8.9-6:0.8.9-0ubuntu0.13.04.1, Copyright (c) 2007-2013 the Libav developers
  built on Nov  9 2013 19:09:48 with gcc 4.7.3
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 1
    compatible_brands: isom
    creation_time   : 2017-01-05 00:59:37
  Duration: 00:38:09.65, start: 0.000000, bitrate: 2029 kb/s
    Stream #0.0(und): Audio: aac, 44100 Hz, stereo, s16, 125 kb/s
    Metadata:
      creation_time   : 2016-03-09 18:47:40
    Stream #0.1(und): Video: h264 (High), yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 1900 kb/s, 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc
    Metadata:
      creation_time   : 2016-03-09 22:36:52

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Bugs, which is subscribed to OpenShot Video Editor.
https://bugs.launchpad.net/bugs/1654570

Title:
  Particular 1080p video very slow to show audio waveform

Status in OpenShot Video Editor:
  New

Bug description:
   - Architecture is x86_64 
   - OS is Xubuntu 13.04 (yes, I know Ubuntu no longer support this version, but https://github.com/probonopd/AppImageKit/blob/master/README.md says "Use an old system for building (at least 2-3 years old)" :-)
   - Installation method is AppImage 
   - Version of OpenShot is 2.2.0 
   - The video plays & seeks fine in both "ffplay" and "melt".  
   - melt 0.8.8 
   - "ffplay -version" reports "avplay version 0.8.9-6:0.8.9-0ubuntu0.13.04.1" 
   - Drag-n-drop video from Project Files windowpane to track display, right-click video in the track display, choose Display > Show Waveform.  
   - The full video is a 1080p 24fps MP4, about 581 MB and 38 minutes long.  The Show Waveform process on this video takes prohibitively long (several minutes or it locks up forever, I suspect it's the latter).  
   - If I slice the video into pieces as big as 200 MB, the Show Waveform process takes a more reasonable length of time.  
   - I'm using the following command line to split the video:  

  MP4Box -splits 200000 video.mp4

   - "MP4Box -version" reports 0.5.1-DEV-rev4065
   - The largest split size that MP4Box will honour on this video is 569000.  At this split size, OpenShot still appears to take forever to draw the waveform.  
   - OpenShot CPU usage is at 100% of one core.  The old-school X wristwatch busy-pointer is shown, and the UI still responds (e.g., opening the Preferences window), but slowly.  Exiting OpenShot leaves /bin/bash .bin//openshot-qt.wrapper running @ 100% CPU time (one core).  
   - Pitivi old version 0.15.2 takes only seconds to show the waveform of the full 38-minute video.  

  Due to the size of the video, I haven't attached it to this bug
  report.  If you'd like me to get the full video to you some other way,
  please tell me.

  Many thanks.

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