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• OpenGL (GLEW) + FFMPEG + VS2010 release build

  6 décembre 2015, par rickhik

  Currently I am working on a application that uses OpenGL (GLEW) and FFMPEG (libav’s) in Visual Studio 2010. The GLEW libs are included as Additional Libraries. The libav is set via a header file with extern "c" and pragma comment lib.

  The application opens a OpenGL window which draws some quads with textures via FFMPEG. I want to use this application for my volunteer job at a TV station of a Childrens Hospital.

  The problem I have is building a release version of my project. When I am building a Debug version it all works fine. I get a OpenGL Window with the quads. When I change Debug into Release and start the Debugger, it gives me the message "entry point of procedure __GLEW_EXT_framebuffer_object not found in DLL avcodec-56.dll", which is a bit strange to me because of the fact that the GLEW is not part of the avcodec-56.dll ?

  I can solve this issue by going to the project settings -> Linker -> Optimization and switch References from Yes(/OPT:REF) to No(/OPT:NOREF). I start the debugger to build the solution and it works as well. Now when I go to the Release folder of the project and start the build executable, the OpenGL Window stays black without giving me an error message.

  I hope you guys can help me out.

  @michael-iv I saw you had a similar issue

• getting a lot of errors when reading udp stream with avconv

  5 août 2015, par eladm26

  I’m trying to read a udp video stream and I’m getting mostly errors :)
  here is my input and output :

  avconv   -i udp://**.**.**.**:**** output.ts
  
  avconv version 11.4, Copyright (c) 2000-2014 the Libav developers
  
    built on Jul 14 2015 12:43:36 with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
  
  [mpeg2video @ 0x25a7060] Invalid frame dimensions 0x0.
  
      Last message repeated 13 times
  
  [mpegts @ 0x2582040] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, mpegts, from 'udp://239.1.1.1:59001':
  
    Duration: N/A, start: 17336.030511, bitrate: 24640 kb/s
  
    Program 3
  
      Stream #0.0[0x31]: Video: mpeg2video (Main), yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 24000 kb/s, 29.97 fps, 90k tbn, 59.94 tbc
  
      Stream #0.1[0x34](eng): Audio: ac3, 48000 Hz, 5.1, fltp, 448 kb/s
  
      Stream #0.2[0x35](spa): Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
  
  File 'output.ts' already exists. Overwrite ? [y/N] y
  
  Output #0, mpegts, to 'output.ts':
  
    Metadata:
  
      encoder         : Lavf56.1.0
  
      Stream #0.0: Video: mpeg2video, yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 29.97 fps, 90k tbn, 29.97 tbc
  
      Metadata:
  
        encoder         : Lavc56.1.0 mpeg2video
  
      Stream #0.1(eng): Audio: mp2, 48000 Hz, stereo, s16, 384 kb/s
  
      Metadata:
  
        encoder         : Lavc56.1.0 mp2
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mpeg2video (native) -> mpeg2video (native))
  
    Stream #0:1 -> #0:1 (ac3 (native) -> mp2 (native))
  
  Press ctrl-c to stop encoding
  
  [mpeg2video @ 0x25c85e0] warning: first frame is no keyframe
  
  Continuity check failed for pid 49 expected 12 got 5 bitrate=3922.8kbits/s
  
  [mpegts @ 0x2582040] Continuity check failed for pid 52 expected 6 got 1
  
  [mpegts @ 0x2582040] Continuity check failed for pid 53 expected 7 got 14
  
  [mpegts @ 0x2582040] Continuity check failed for pid 0 expected 4 got 1
  
  [mpeg2video @ 0x25c85e0] ac-tex damaged at 2 53
  
  [mpeg2video @ 0x25c85e0] 00 motion_type at 19 38
  
  [mpeg2video @ 0x25c85e0] 00 motion_type at 18 54
  
  [mpeg2video @ 0x25c85e0] ac-tex damaged at 1 39
  
  [mpeg2video @ 0x25c85e0] 00 motion_type at 48 55
  
  [mpeg2video @ 0x25c85e0] 00 motion_type at 2 56
  
  [mpeg2video @ 0x25c85e0] 00 motion_type at 17 40
  
  [mpeg2video @ 0x25c85e0] ac-tex damaged at 5 60
  
  [mpeg2video @ 0x25c85e0] 00 motion_type at 1 61
  
  [mpeg2video @ 0x25c85e0] 00 motion_type at 16 41
  
  [mpeg2video @ 0x25c85e0] ac-tex damaged at 15 46
  
  [mpeg2video @ 0x25c85e0] 00 motion_type at 6 62
  
  [mpeg2video @ 0x25c85e0] 00 motion_type at 24 42
  
  [mpeg2video @ 0x25c85e0] 00 motion_type at 16 47
  
  [mpeg2video @ 0x25c85e0] mb incr damaged
  
  [mpeg2video @ 0x25c85e0] ac-tex damaged at 3 44
  
  [mpeg2video @ 0x25c85e0] 00 motion_type at 8 63
  
  [mpeg2video @ 0x25c85e0] 00 motion_type at 11 65
  
  [mpeg2video @ 0x25c85e0] ac-tex damaged at 1 66
  
  [mpeg2video @ 0x25c85e0] invalid mb type in P Frame at 42 50
  
  [mpeg2video @ 0x25c85e0] 00 motion_type at 9 51
  
  [mpeg2video @ 0x25c85e0] ac-tex damaged at 45 67
  
  [mpeg2video @ 0x25c85e0] 00 motion_type at 48 52
  
  [mpeg2video @ 0x25c85e0] MVs not available, ER not possible.
  
  [mpegts @ 0x2582040] PES packet size mismatch
  
      Last message repeated 1 times
  
  [ac3 @ 0x25c8b00] exponent out-of-range
  
  [ac3 @ 0x25c8b00] error decoding the audio block
  
  [mpegts @ 0x2582040] Continuity check failed for pid 49 expected 13 got 5
  
  [mpegts @ 0x2582040] Continuity check failed for pid 52 expected 12 got 14
  
  [mpeg2video @ 0x25c85e0] 00 motion_type at 97 65
  
  [mpeg2video @ 0x25c85e0] 00 motion_type at 1 4
  
  [mpeg2video @ 0x25c85e0] invalid cbp at 18 5
  
  [mpeg2video @ 0x25c85e0] 00 motion_type at 1 6
  
  [mpeg2video @ 0x25c85e0] mb incr damaged
  
  [mpeg2video @ 0x25c85e0] 00 motion_type at 34 8
  
  [mpeg2video @ 0x25c85e0] 00 motion_type at 8 9
  
  [mpeg2video @ 0x25c85e0] 00 motion_type at 6 11
  
  [mpeg2video @ 0x25c85e0] invalid cbp at 5 18
  
  [mpeg2video @ 0x25c85e0] 00 motion_type at 13 19
  
  [mpeg2video @ 0x25c85e0] 00 motion_type at 3 20
  
  [mpeg2video @ 0x25c85e0] 00 motion_type at 16 21
  
  [mpeg2video @ 0x25c85e0] invalid cbp at 3 22
  
  [mpeg2video @ 0x25c85e0] invalid mb type in B Frame at 4 23
  
  [mpeg2video @ 0x25c85e0] invalid mb type in B Frame at 3 24

  I’ve searched stack overflow and couldn’t find any similar.
  maybe it has something to do with avconv cant handle the udp frames fast enough ?
  I lost any hope so any help is very welcomed.

  Thanks.

• FFMPEG - Verify frame order

  27 octobre 2015, par RockJake28

  I have created a video of a large number of images using ffmpeg using the following command

  ffmpeg -framerate 25 -pattern_type glob -i "*.png" -c:v libx264 -pix_fmt yuv420p /home/jake/Desktop/output.mp4

  The command works and produces a video, however I need a way to verify that the images have been processed in the correct order as the files have quite obscure names. For example, the first 3 images in the sequence are :

  1. image_20150625T100000.000_550000328.png
  2. image_20150625T100000.033_550330578.png
  3. image_20150625T100000.067_550671379.png

  all the way up to

  image_20150625T100459.987_3546673942.png

  I have tried using the -loglevel switch on various different options in hope that one would output the file name of each frame processed, but none seem to do that.

  Thanks in advance.