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• VB Dot Net ffMpeg Network Web Server Cannot Execute JS Ajax Call to Private Web Server When Client is Outside Network

  29 septembre 2019, par Sonbelt

  I have a solution that is using Windows Server 2008 (Web Server), Windows Server 2008 (MS Sql Database Server), Computer with Windows 10 Home with IIS acting as a file server that runs command line calls where ffMpeg converts video files to html5 compliant files and then puts them on the NAS (a WD Network Drive.). Users then use the public website to view the videos streamed from the NAS.

  Windows Server 2008 cannot make a command line call to ffMpeg. If it could the performance hit would be too large.

  In order to get the public web server to call a private web page I’m using an Ajax post call to the file server web site. That site converts the videos and then there is a separate routine that moves the files using the same methodology. In order to get the file server where it can move the files to the NAS I’ve set the application pool identity to a specific user. The public web server is using the Network Service as the identity for the application pool.

  When I run the pages on the public server from behind the firewall where the calling ip address is in the same network the solution works fine but when I use any device or browser when the calling ip address is not in the local network the JS Ajax call to the private web site does not work. No lines appear in the IIS log on the file server.

  I’ve tried changing to the other built in choices and set the identity as the administrator on the public web server. Turned off the public server firewall, turned off the private files server firewalls without success.

  The solution needs to work when the calling ip address is not in the local network. I apologize for long post. Can you help me please ?

• why type casting on non-pointer struct give syntax error

  1er avril 2020, par Sany Liew

  I am using Visual C++ express 2008 try to compile code similar to below :

  



  no problem

  



  {
  ...
  AVRational test = {1, 1000};
  ...
}


  



  but has problem when it is as below :

  



  {
  ...
  AVRational test = (AVRational){1, 1000};
  ...
}


  



  gave errors :

  



  1>..\..\..\projects\test\xyz.cpp(1139) : error C2059: syntax error : '{'
1>..\..\..\projects\test\xyz.cpp(1139) : error C2143: syntax error : missing   ';' before '{'
1>..\..\..\projects\test\xyz.cpp(1139) : error C2143: syntax error : missing ';' before '}'


  



  where AVRational (ffmpeg.org library) is defined as :

  



  typedef struct AVRational{
    int num; ///< numerator
    int den; ///< denominator
} AVRational;


  



  FFmpeg come with some pre-define value such as

  



  #define AV_TIME_BASE_Q (AVRational){1, AV_TIME_BASE}


  



  which is used as below

  



  av_rescale_q(seek_target, AV_TIME_BASE_Q, pFormatCtx->streams[stream_index]->time_base);


  



  will failed to compile on Visual C++ express 2008

  



  It seem like the same code will be compiled with no error/warning on gcc compiler. Why I get this error on VC++ ? Is it a C/C++ standard way to do casting on struct value ? Anyway I can avoid this error while still able to use the defined AV_TIME_BASE_Q ?

  


• FFmpeg : A few errors including invalid frame size and incomplete frame

  8 février 2019, par Abs

  I use this ffmpeg command to take clips from a large VOB files that is on a DVD :

  ffmpeg.exe -i E:\VTS_02_2.vob -ss 00:00:57 -t 00:16:15 vids\VTS_02_2.vob

  It worked first for a VOB file but then I got these errors :

  c:\ffmpeg>ffmpeg.exe -i E:\VTS_02_2.vob -ss 00:00:57 -t 00:16:15 vids\VTS_02_2.vob
  
  FFmpeg version SVN-r15625, Copyright (c) 2000-2008 Fabrice Bellard, et al.
  
    configuration: --enable-memalign-hack --enable-postproc --enable-swscale --enable-g
  
  l --enable-libfaac --enable-libfaad --enable-libgsm --enable-libmp3lame --enable-libv
  
  rbis --enable-libtheora --enable-libx264 --enable-libxvid --disable-ffserver --disabl
  
  -vhook --enable-avisynth --enable-pthreads
  
    libavutil     49.12. 0 / 49.12. 0
  
    libavcodec    52. 0. 0 / 52. 0. 0
  
    libavformat   52.22. 1 / 52.22. 1
  
    libavdevice   52. 1. 0 / 52. 1. 0
  
    libswscale     0. 6. 1 /  0. 6. 1
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
    built on Oct 16 2008 05:40:02, gcc: 4.2.4 (TDM-1 for MinGW)
  
  Input #0, mpeg, from 'E:\VTS_02_2.vob':
  
    Duration: 00:17:11.61, start: 1031.828511, bitrate: 8326 kb/s
  
      Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 720x576 [PAR 16:15 DAR 4:3], 9640
  
  kb/s, 25.00 tb(r)
  
      Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, s16, 192 kb/s
  
  File 'vids\VTS_02_2.vob' already exists. Overwrite ? [y/N] y
  
  Output #0, svcd, to 'vids\VTS_02_2.vob':
  
      Stream #0.0: Video: mpeg2video, yuv420p, 720x576 [PAR 16:15 DAR 4:3], q=2-31, 200
  
  kb/s, 25.00 tb(c)
  
      Stream #0.1: Audio: mp2, 48000 Hz, stereo, s16, 64 kb/s
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
    Stream #0.1 -> #0.1
  
  Press [q] to stop encoding
  
  [ac3 @ 026D3990]frame sync error
  
  Error while decoding stream #0.1
  
  frame=    0 fps=  0 q=0.0 size=       0kB time=10000000000.00 bitrate=   0.0kbits/s
  
  [mpeg2video @ 0141B780]ac-tex damaged at 40 2
  
  [mpeg2video @ 0141B780]invalid mb type in B Frame at 3 12
  
  [mpeg2video @ 0141B780]00 motion_type at 15 16
  
  [mpeg2video @ 0141B780]mb incr damaged
  
  [mpeg2video @ 0141B780]00 motion_type at 2 21
  
  [mpeg2video @ 0141B780]00 motion_type at 44 22
  
  [mpeg2video @ 0141B780]ac-tex damaged at 43 24
  
  [mpeg2video @ 0141B780]Warning MVs not available
  
  [mpeg2video @ 0141B780]concealing 765 DC, 765 AC, 765 MV errors
  
  frame=    0 fps=  0 q=0.0 size=       0kB time=10000000000.00 bitrate=   0.0kbits/s
  
  frame=    0 fps=  0 q=0.0 size=       0kB time=10000000000.00 bitrate=   0.0kbits/s
  
  frame=    0 fps=  0 q=0.0 size=       0kB time=10000000000.00 bitrate=   0.0kbits/s
  
  frame=    0 fps=  0 q=0.0 size=       0kB time=10000000000.00 bitrate=   0.0kbits/s
  
  [mpeg2video @ 0141B780]ac-tex damaged at 5 9
  
  [mpeg2video @ 0141B780]00 motion_type at 21 13
  
  [mpeg2video @ 0141B780]ac-tex damaged at 1 20
  
  [mpeg2video @ 0141B780]mb incr damaged
  
  [mpeg2video @ 0141B780]00 motion_type at 30 30
  
  [mpeg2video @ 0141B780]Warning MVs not available
  
  [mpeg2video @ 0141B780]concealing 450 DC, 450 AC, 450 MV errors
  
  [ac3 @ 026D3990]frame CRC mismatch
  
  [ac3 @ 026D3990]incomplete frame
  
  [ac3 @ 026D3990]invalid frame size
  
  frame=    0 fps=  0 q=0.0 size=       0kB time=10000000000.00 bitrate=   0.0kbits/s
  
  [mpeg2video @ 0141B780]00 motion_type at 38 15
  
  [mpeg2video @ 0141B780]00 motion_type at 30 34
  
  [mpeg2video @ 0141B780]Warning MVs not available
  
  [mpeg2video @ 0141B780]concealing 254 DC, 254 AC, 254 MV errors
  
  frame=    0 fps=  0 q=0.0 size=       0kB time=10000000000.00 bitrate=   0.0kbits/s
  
  frame=    0 fps=  0 q=0.0 size=       0kB time=10000000000.00 bitrate=   0.0kbits/s
  
  [mpeg2video @ 0141B780]ac-tex damaged at 7 6
  
  [mpeg2video @ 0141B780]concealing 1350 DC, 1350 AC, 1350 MV errors
  
  frame=    0 fps=  0 q=0.0 size=       0kB time=10000000000.00 bitrate=   0.0kbits/s
  
  [ac3 @ 026D3990]incomplete frame
  
  [ac3 @ 026D3990]invalid frame size
  
  frame=    0 fps=  0 q=0.0 size=       0kB time=10000000000.00 bitrate=   0.0kbits/s
  
  frame=    0 fps=  0 q=0.0 Lsize=       0kB time=10000000000.00 bitrate=   0.0kbits/s
  
  
  
  video:0kB audio:0kB global headers:0kB muxing overhead -1.#IND00%

  Is there a way to force ffmpeg to just give me an output ?