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• python ff-mpeg not working on VM

  2 août 2013, par Bob

  I have two Windows 2008 R2 64 bit servers with two different host providers (GoDaddy and company B). My python script runs successfully on GoDaddy's server. It doesn't run successfully on the server with company B.

  I installed the same software on both servers :

  • Python 2.7 for Windows 32 bit
  • NumPY module
  • SetupTools
  • EchoNest API for Windows

  The company B server is giving me an error related to an executable called en-ffmpeg.exe that uses the python ff-mpeg module. The exact error message is

  [dv @ 0x1449690]Can't determine profile of DV input stream.
  C :\Music\song1.mp3 : Error while opening file

  The song.mp3 file exists. I installed the latest Windows updates on the server with Company B but still I get the error. I believe the error is because something is not configured properly on this server (missing libraries or drivers ?). However, I don't know what that is !

  Please help :)

  UPDATED TO INCLUDE COMMAND AND ERROR OUTPUT FROM FFMPEG

  COMMAND :

  c :\Python27>en-ffmpeg -i "C :\Music\song1.mp3" -y -ac 2 -ar 44100
  "c :\users\x07 dmini 1\x07ppdata\local\temp\x02\tmpax82jf.wav"

  FULL ERROR :

  FFmpeg version SVN-r17988-Komeil, Copyright (c) 2000-2009 Fabrice Bellard, et al
  
  .
  
    configuration: --enable-memalign-hack --extra-cflags=-fno-common --enable-stat
  
  ic --disable-shared --disable-debug --enable-gpl --enable-nonfree --enable-avfil
  
  ter --enable-avfilter-lavf --enable-avisynth --enable-postproc --enable-pthreads
  
   --enable-libamr-nb --enable-libamr-wb --enable-libgsm --enable-libfaac --enable
  
  -libfaad --enable-libmp3lame --enable-libschroedinger --enable-libspeex --enable
  
  -libtheora --enable-libvorbis --enable-libx264 --enable-libxvid
  
    libavutil     50. 0. 0 / 50. 0. 0
  
    libavcodec    52.21. 0 / 52.21. 0
  
    libavformat   52.31. 1 / 52.31. 1
  
    libavdevice   52. 1. 0 / 52. 1. 0
  
    libavfilter    0. 4. 0 /  0. 4. 0
  
    libswscale     0. 7. 1 /  0. 7. 1
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
    built on Mar 15 2009 18:16:31, gcc: 4.3.0 20080305 (alpha-testing) mingw-20080
  
  502
  
  [dv @ 0x1449690]Can't determine profile of DV input stream.
  
  C:\\Music\\song1.mp3: Error while opening file

  I also tried removing the double back slashes from the command but got the same error.

• Inconsistent behavior when placing adjacent video overlays

  24 juillet 2023, par abingham

  This script uses ffmpeg to overlay a red [1] and blue [2] stream atop a yellow [0] stream. The intent is that the red stream will be exactly adjacent to the blue stream ; at frame 1731 the output video should transition immediately from pure red to pure blue :

  


  # These values result in a blank frame where the videos join at around 58s
LENGTH=1800
SPLIT_AT=1731

# These values work just fine.
# LENGTH=1800
# SPLIT_AT=2

ffmpeg \
-f lavfi -r 30 -i "color=c=yellow:s=1920x1080" \
-f lavfi -r 30 -i "color=c=990000:s=1920x1080" \
-f lavfi -r 30 -i "color=c=000099:s=1920x1080" \
-filter_complex \
"[1]concat=n=1[red_concat];"\
"[red_concat]tpad=start=0[red_pad];"\
"[0][red_pad]overlay=enable=between(n\,0\,$SPLIT_AT):eof_action=repeat[red_overlay];"\
"[2]concat=n=1[blue_concat];"\
"[blue_concat]tpad=start=$SPLIT_AT[blue_pad];"\
"[red_overlay][blue_pad]overlay=enable=between(n\,$SPLIT_AT\,$LENGTH):eof_action=repeat[blue_overlay];"\
"[blue_overlay]trim=end_frame=$LENGTH[full];" \
 -map "[full]" video.mp4 -y


  


  However, what I see is that there is a single black frame between the pure red and pure blue. This black seems to be coming from the frames that tpad adds.

  


  What I don't understand is why I'm seeing that black frame. As far as I can tell, my uses of tpad and overlay/enable-between should produce a seamless transition from red to blue. And indeed, if I change the SPLIT_AT value to almost anything else I get exactly that ; the value 1731 is "special" in some way.

  


  Can anyone explain what's going on ? Maybe more importantly, can anyone reproduce this problem ?

  


  My first thought was that I've got some form of fencepost error in how I'm using tpad or enable-between. However, that doesn't explain why the script works for most values but not 1731. This difference in results feels like there's a rounding error somewhere, but since I'm dealing purely in terms of integer frame numbers, I don't see how I could be introducing them.

  


  A few notes :

  


  


  • This is a drastically reduced example from a larger video compositing system. Things like the use of concat may appear unnecessary, but they're representative of what the larger system is doing.

    


  


  • I'm using ffmpeg-6.0 installed via homebrew on an M1 macbook

    


  


  


• Array Getting Lost While Passing From C++ to C Using Callback [duplicate]

  23 décembre 2020, par Abhishek Sharma

  I am trying to write Video Using FFmpeg by generating frame at run time using direct3d and the frames are generated using sharp dx at c# and I use window runtime to callback to c# to generate Frame And return Platform::Array of Byte ;

  


  so for writing video using FFmpeg, I used C code that writes video, and to ask for generating frame I implemented a callback to generate a frame and all that in StaticLib

  


  uint8_t*(*genrate_frame_callback)(int) = NULL;   


  


  now in C-File, I call fill_image to get the frame and write to the video

  


  static void fill_image(int frame_index, int width, int height)
{
    int x, y, i;

    i = frame_index;
    auto result = genrate_frame_callback(frame_index);// after passing this point while using debugger reults single element not even array
    .
    .
    .
    code to write video
    
}


  


  now when I call to Write Video before that pass this function to the callback that is in the c++ file in a Window Runtime Component that reference to static lib

  


  uint8_t* genrate_frame(int args)&#xA;{&#xA;    auto frame = FireGenrateFramet(args); // returns Platform::Array<byte>&#xA;    vector v(frame->begin(), frame->end());&#xA;    return v.data();// data is abilabe to this point &#xA;}&#xA;</byte>

  


  now the result variable contains a single element
I am new to c++ and c and unable to understand why is data not passed to the function using call back

  


  Edit :

  


  then can you help me with how to pass Data I tried using the global Scope Variable c++ file too but still,
it gets lost,
but after introducing another call back to read data stored in global Variable it read the whole data correctly

  


  vector frame_v;
uint8_t* genrate_frame(int args)
{
    auto frame = FireGenrateFrame(args);
     vector v(frame->begin(), frame->end());
    frame_v = v;
    return v.data();// this loose the Same 
}

uint8_t read_pixal(int args)
{
    return frame_v[args];// where as it read out correctly
}


  


  but I don't want to store and add new call back an read from their just pass the array