Newest 'ffmpeg' Questions - Stack Overflow

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• How can I fix ffmpeg error ?

  7 avril 2016, par Zuiche

  I run ffmpeg command to convert flv to mp4.

  ffmpeg -i test.flv -vcodec libx264 output.mp4
  

  When I run on centos 5.1_x86, it occurs a error following this:

  picture size invalid (0x0) Cannot allocate temp picture, check pix fmt
  

  How can I fix this error?

  Thanks in advance.

• How to use ffmpeg command in objective C

  7 avril 2016, par Anoop

  I've done with FFmpeg. Build Successfully and added in project. First time I was able to convert the file. But When I try again , program gets crash . So Some one suggest me , How to proper clean Up FFmpeg before sending next command. Or are there other way to send ffmpeg command.

   char **argv = (char **)malloc(sizeof(argc));
  
  argv[0]="ffmpeg";
  argv[1] = "-i";
  argv[2] = "-b:a";
  argv[3] = "192k";
  argv[2] =(char *)[inputFilePath UTF8String];
  argv[3] = (char *)[outputFilePath UTF8String];
  
  
     int result =   main_method(argc, argv);
  
  NSLog(@"result %d",result);
  

• FFmpeg : Add alpha channel to a video using a PNG mask

  7 avril 2016, par Rodrigo Polo

  I saw that FFmpeg can merge/blend two videos with alpha channel and can encode video with alpha channel using the qtrle codec, but, It is possible to apply a PNG file mask, either a black and white or a PNG with an alpha channel to a video in order to have a video with the alpha channel of the PNG applied?

  Here is the concept in images

  Original video:

  PNG file with alpha channel, the "mask":

  And the result:

  Or even a black and white image as a mask for alpha channel:

  Any help would be appreciated, thank you!

• Couldn't find platform family in Info.plist for dylib

  7 avril 2016, par user2331687

  

  I have developed a App (Mac OS) and I want release it to Mac App Store, and my App use the FFMPEG library, so there are many .dylib (as you can see, for example, libSDL-1.2.0.dylib), when I upload my App, and I got this error, I have googled several days, but I don't know how to add the "platform family" to a .dylib, since the dylib is build from command line. Can anyone help me to solve this problem, thanks very much!

• RTSP ip camera streaming to Android using ffmpeg

  7 avril 2016, par Shanu

  I am working on an app which would stream and capture an image from an IP camera using an RTSP url. I am not able to create an app using FFMpeg. I have tried Vitamio library but it does not have a capture function. Anyone know how to create a rtsp player using ffmpeg in android.? what would be the ffserver.config file changes i have to make.? how to play the video.?