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• Assertion error when encoding video using ffmpeg library on visual studio c++

  18 juin 2015, par Leon Phan

  I have a project, that i need to received data from a rtsp link, decode,resize video, encode it and save to .mp4 file.

  • I Using ffmpeg from http://ffmpeg.zeranoe.com/builds/
  • I am using visual studio 2010, run on windows 7 and windows 8.
  • This is rtsp link i am using : rtsp ://184.72.239.149/vod/mp4:BigBuckBunny_175k.mov
  • I decode and save to ppm file is ok. But encode isn’t.
  • I following there tutorials : http://dranger.com/ffmpeg/tutorial01.html

  this is my code :

  AVPacket destPacket;
  
  av_init_packet(&destPacket);
  
  destPacket.data = NULL;
  
  destPacket.size = 0;
  
  while(av_read_frame(i_format_context, &packet)>=0) {
  
      if(packet.stream_index==video_stream_index) {
  
          int rest = avcodec_decode_video2(copyInputCodec, pFrame, &frameFinished, &packet);
  
          if(frameFinished) {
  
              av_init_packet(&destPacket);
  
              destPacket.data = NULL;
  
              destPacket.size = 0;
  
              av_free_packet(&destPacket);
  
              //deocde here
  
              int ret_scale = sws_scale(sws_ctx,pFrame->data,pFrame->linesize,0,copyInputCodec->height,encodeFrame->data,encodeFrame->linesize);
  
              encodeFrame->pts=i;
  
              int ret_enc = avcodec_encode_video2(copyOutputCodec,&destPacket,encodeFrame,&encodeFinishsed);//<--- Problem here.
  
              getchar();
  
          }
  
      }
  
  }

  And this is output error

  [swscaler @ 00607880] Warning : data is not aligned ! This can lead to a
  speedlo ss
  Assertion avctx->codec->encode2 failed at /home/kyle/software/ffmpeg/source/ffmp
  eg-git/libavcodec/utils.c:2134

  I try to run many sample code to encode video, the result is same.

  Thanks for help.

  PS : sorry about my English skill.

• Why is Visual Studio executing the wrong code [closed]

  15 mai 2023, par Jacob

  Not sure what is going on here. Code that I have deleted is still executing. I am sending parameters to FFMPEG for video editing. FFMPEG is then processing parameters that I previously sent, which is now deleted. While trying to figure this out, I sent the string "WTF !" directly to the FFMPEG parameters and FFMPEG is still processing the video with old parameters. The string "WTF !" should have broke FFMPEG so it is clearly executing the wrong code. Hasd anyone ever encountered this ?

  


• Android Studio - add background to transparent GIF and export to new GIF file (FFMpeg ?)

  21 avril 2019, par user10969667

  How to export the current android view that contains background image + transparent GIF into a new GIF file ? FFmpeg can do it ?

  With FFmpeg I can do these steps :
  1. Convert GIF to video
  2. Add background to video
  3. Convert video to GIF

  is there a simpler way ? what is the performance to working with FFmpeg library ?
  I never work with it before.

  Please help !