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• ffmpeg, 'protocol not found' error

  15 août 2017, par gogoer

  i’m using next code :

  const char *sFileOutput;
  
  AVOutputFormat *ofmt;
  
  AVFormatContext *ofcx;
  
  
  
          int main( int argc, char* argv[] )
  
          {
  
              av_log_set_level( AV_LOG_DEBUG );
  
              av_register_all();
  
              avcodec_register_all();
  
              avformat_network_init();
  
  
  
              char s1[40]={0};
  
              const time_t timer = time(NULL);
  
              u = localtime(&timer);
  
              strftime(s1, 40, "%d.%m.%Y-%H:%M:%S.avi", u);
  
              sFileOutput=&s1;
  
  
  
              //char *sFileOutput = "01.01.2017-23.23.23.avi";
  
  
  
              ofmt = av_guess_format( NULL, sFileOutput, NULL );
  
              ofcx = avformat_alloc_context();
  
              ofcx->oformat = ofmt;
  
              int ret2=avio_open( &ofcx->pb, sFileOutput, AVIO_FLAG_WRITE);
  
              if(ret2<0){
  
                  fprintf(stderr, "\nError occurred when opening output file: %s\n",av_err2str(ret2));
  
              }
  
          }

  When i run it, i have error in console :

  Error occurred when opening output file: Protocol not found

  but if i uncomment string

  char *sFileOutput = "01.01.2017-23.23.23.avi";

  evirything is ok, progam is working without errors. please tell me what is wrong.

• using ffmpeg create video collage from video captured by app

  25 septembre 2017, par Bharat singh

  Hi guys i am working on a android app which is based on video collage in which have to create collage from selected or captured video, there are different types of collage i have to implement. i have implemented most of them.
  But i am stuck when i try to create a specific type of collage.

  So here is my question

  i have to create a collage in which all video should play one be one

  i have to combine 16 video all together in a frame and play one by one.

  it should be look like this

  

  for now all video are playing together what should i do so that all videos play one by one
  Thanks in Advance

• How to generate SDP file from FFMPEG

  29 octobre 2017, par MobilityLab

  So, I have been working with FFMPEG on a project that involves streaming video from one computer to another across the internet with RTP. I want to take that into ffmpeg and use ffserver to display it on a local network.

  As I understand it, you need to have a SDP information so that the receiving ffmpeg instance can interpret the RTP stream. Despite what webpages say, I can not find the SDP information in the information printed to the console.

  How can I force the transmitting ffmpeg instance to output the SDP information so that I can use it to configure my receiving end ?

  Right now, I am testing on Windows 7, but the final solution will be on linux.

  The command I’m running for testing is

  ffmpeg -fflags +genpts -i files\2005-SFSD-sample-mpeg1.mpg -threads 0 -r 10 -g 45
  
  -s 352x240 -deinterlace -y 2005.mp4 -an -threads 0 -r 10 -g 45 -s 352x240 
  
  -deinterlace -f rtp rtp://192.168.200.198:9008

  My ffmpeg information is...

  ffmpeg version 0.8, Copyright (c) 2000-2011 the FFmpeg developers built on Jun 23 2011 14:22:23 with gcc 4.5.3 
  
  configuration: 
  
  --disable-static  
  
  --enable-shared 
  
  --enable-gpl  
  
  --enable-version3 
  
  --enable-memalign-hack  
  
  --enable-runtime-cpudetect 
  
  --enable-avisynth 
  
  --enable-bzlib 
  
  --enable-frei0r 
  
  --enable-libopencore-amrnb 
  
  --enable-libopencore-amrwb 
  
  --enable-libfreetype 
  
  --enable-libgsm 
  
  --enable-libmp3lame 
  
  --enable-libopenjpeg 
  
  --enable-librtmp 
  
  --enable-libschroedinger 
  
  --enable-libspeex 
  
  --enable-libtheora 
  
  --enable-libvorbis 
  
  --enable-libvpx 
  
  --enable-libx264 
  
  --enable-libxavs 
  
  --enable-libxvid 
  
  --enable-zlib 
  
  --disable-outdev=sdl 
  
    libavutil    51.  9. 1 / 51.  9. 1 
  
    libavcodec   53.  7. 0 / 53.  7. 0 
  
    libavformat  53.  4. 0 / 53.  4. 0 
  
    libavdevice  53.  1. 1 / 53.  1. 1 
  
    libavfilter   2. 23. 0 /  2. 23. 0 
  
    libswscale    2.  0. 0 /  2.  0. 0 
  
    libpostproc  51.  2. 0 / 51.  2. 0