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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.

• ffmpeg progress is freezing frames when scene change

  19 août 2017, par Karol

  I’m capturing data from IP camera with RTSP protocol with ffmpeg with command :

  ffmpeg -rtsp_transport tcp -progress /media/kamip/stats.txt -i rtsp://192.168.1.220:554/live/h264/ch0 
  
  -c:v copy -c:a copy -strict 1 -map 0 -f segment -strftime 1 
  
  -segment_time 1800 /media/kamip/cam_%d_%m_%Y_%H_%M_%S.mkv

  I’m using this for 5 cameras. One is different type and it is in different location.
  Because ffmpeg does not support reconnect I’m writing status to /media/kamip/stats.txt file. In another script I’m parsing this output and every 30 seconds I’m checking if frame number changed, if yes - it is ok, if not, I’m restarting above command.

  The problem is only in the night. When is quite dark and suddenly lights on, for example when car is parking, the /media/kamip/stats.txt is showing the same frame number, so my script is recognizing this as a lost connection (video freeze)

  I tried "-strict 1" option and I think it is better (one false alarm per day instead of 10 per day), so I think this may be related to ffmpeg, not camera/video source, especially because the video is fine even frame number reported by ffmpeg is still the same. Also VLC does not have this kind of problem (but I cannot use it currently for this camera)

  I found that ffmpeg has build-in scene change detector, but it should works only when encoding video (I’m using "copy" option for audio and video) ?

  I’m thinking about different way of analyzing the video capturing, but this "-progress" in ffmpeg should works fine - and it is working fine for other cameras for few years).

  I also do not see any errors,
  when I encoded one cutted file with "-loglevel debug" I saw only information like below :

  [libx264 @ 0x25d77a0] scene cut at 174 Icost:2049115 Pcost:2006553 
  
  ratio:0.0208 bias:0.1387 gop:54 (imb:3186 pmb:168)

  ffmpeg in latest version

  ffmpeg version 3.3.3-1ubuntu1~16.04.york0 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609

  any help will be appreciated

• How to set reset_timestamps with FFMPEG C/C++

  16 août 2017, par hung

  I save my RTSP stream to mp4 video file every minute. But the problem is when new video created, the start time is not close to 0, it increases continously, here’s out put of a video like that with ffprobe :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from './2017/8/15/8/56/56.mp4':
  
  Metadata:
  
  major_brand     : isom
  
  minor_version   : 512
  
  compatible_brands: isomiso2avc1mp41
  
  encoder         : Lavf57.41.100
  
  Duration: 00:01:00.28, start: 60.247005, bitrate: 2244 kb/s
  
  Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc, bt709), 1280x720 [SAR 1:1 DAR 16:9], 2243 kb/s, 14.91 fps, 25 tbr, 15360 tbn, 30 tbc (default)
  
  Metadata:
  
    handler_name    : VideoHandler

  You can see the start value is 60.247005. When I use ffmpeg command line and add option ’reset_timestamps’ it work, all start value close to 0, and if i remove ’reset_timestamps’ it output videos like my code..Here’s command I use :

  ffmpeg -i rtsp://usr:pass@ipaddress/Streaming/Channels/1?tcp -c copy -map 0 -f segment -segment_time 20 -segment_format mp4 -reset_timestamps 1 "capture-%03d.mp4"

  So, I hope i can set the option reset_timestamps in my code, but it seem i can’t. I try with this but no luck :

  AVDictionary* opts = NULL;
  
  av_dict_set(&opts, "reset_timestamps", "1", 0);
  
  
  
  avformat_write_header(ofmt_ctx, &opts);

  Code was posted in my previous question : How to set start time of video saved from RTSP stream with FFMPEG

  Anyone knows how to do that ? Thanks.