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• FFmpeg skips generating thumbs

  25 janvier 2018, par Awais fiaz

  I am using ffmpeg for creating thumbs out of videos within php script however ffmpeg skips creating thumbs sometimes but sometimes it goes okay and works fine i am a little confused of this strange behavior.

  Command which fails :

  Command : /opt/bin/ffmpeg -ss 00:00:06 -i /home/my/public_html/files/conversion_queue/1516767375521d6.mp4 -an -r 1 -y -f image2 -vframes 1 /home/my/public_html/files/thumbs/2018/01/24/1516767375521d6-original-1.jpg 

  Output error

  [image2 @ 0x2eaab00] Could not open file : /home/my/public_html/files/thumbs/2018/01/24/1516767375521d6-original-1.jpg
  
  av_interleaved_write_frame(): Input/output error
  
  frame= 1 fps=0.0 q=7.1 Lsize=N/A time=00:00:01.00 bitrate=N/A speed=25.3x 
  
  video:41kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  Conversion failed! 

  Command which works fine :

  Command : /opt/bin/ffmpeg -ss 00:01:01 -i /home/my/public_html/files/conversion_queue/1516867108c557e.mp4 -an -r 1 -y -f image2 -vframes 1 /home/my/public_html/files/thumbs/2018/01/25/1516867108c557e-original-1.jpg

  Output

  frame= 1 fps=0.0 q=3.1 Lsize=N/A time=00:00:01.00 bitrate=N/A speed=49.9x 
  
  video:21kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

  Although both are same but still i am facing this issue.
  Any help regarding this would be really appreciated.

• Writing only video (no audio) file using ffmpeg. av_write_header fails

  19 janvier 2018, par Kamal

  I have RTP packets with VP8 encoded data. I want to write it to a mkv file or webm file. I tried a bit, but I have not been successful yet. My code is as below

  #include 
  
  #include 
  
  #include 
  
  #include 
  
  #include 
  
  
  
  #include <libavutil></libavutil>avassert.h>
  
  #include <libavutil></libavutil>channel_layout.h>
  
  #include <libavutil></libavutil>opt.h>
  
  #include <libavutil></libavutil>mathematics.h>
  
  #include <libavutil></libavutil>timestamp.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libswscale></libswscale>swscale.h>
  
  #include <libswresample></libswresample>swresample.h>
  
  
  
  bool mfmedia_init_ffmpeg();
  
  void mfmedia_ffprint(void *handle, int cnt, const char *format, va_list valist);
  
  
  
  int main()
  
  {
  
      mfmedia_init_ffmpeg();
  
      return 0;
  
  }
  
  
  
  bool mfmedia_init_ffmpeg() 
  
  {
  
      bool ret = false;
  
  
  
      AVCodecContext* context;
  
      AVCodec* codec;
  
      AVFormatContext* format;
  
      AVStream* stream;
  
  
  
      unsigned fps = 24;
  
      unsigned width = 768;
  
      unsigned height = 608;
  
  
  
      av_register_all();
  
  
  
      int err = 0;
  
      char errorLog[128] = { 0 };
  
  
  
      av_log_set_level(AV_LOG_TRACE);
  
      av_log_set_callback(mfmedia_ffprint);
  
  
  
      err = avformat_alloc_output_context2(&amp;format, NULL, NULL, "o.webm");
  
      if (err &lt; 0) 
  
      {
  
          printf("Cannot allocate output context: %s\n", av_make_error_string(errorLog, 128, err));
  
          goto last;
  
      }
  
  
  
      codec = avcodec_find_encoder(AV_CODEC_ID_VP8);
  
      if (!codec) 
  
      {
  
          printf("Cannot find an encoder\n");
  
          goto last;
  
      }
  
  
  
      context = avcodec_alloc_context3(codec);
  
      if (!context) 
  
      {
  
          printf("Cannot allocate a codec context\n");
  
          goto last;
  
      }
  
  
  
      context->pix_fmt = AV_PIX_FMT_YUV420P;
  
      context->width = width;
  
      context->height = height;
  
      context->time_base = (AVRational){1, fps};
  
  
  
      err = avcodec_open2(context, codec, NULL);
  
      if(err &lt; 0) 
  
      {
  
          printf("Cannot open codec: %s\n", av_make_error_string(errorLog, 128, err));
  
          goto last;
  
      }
  
  
  
      stream = avformat_new_stream(format, codec);
  
      if (!stream) 
  
      {
  
          printf("Cannot create a new stream\n");
  
          goto last;
  
      }
  
  
  
      //av_dump_format(format, 0, "o.webm", 1);
  
  
  
      err = avio_open(&amp;format->pb, "o.webm", AVIO_FLAG_WRITE);
  
      if(err &lt; 0) 
  
      {
  
          printf("Cannot open output: %s\n", av_make_error_string(errorLog, 128, err));
  
          goto last;
  
      }
  
  
  
      err = avformat_write_header(format, NULL); 
  
      if(err &lt; 0) 
  
      {
  
          printf("Cannot write header to stream: %s\n", av_make_error_string(errorLog, 128, err));
  
          goto last;
  
      }
  
      ret = true;
  
  
  
  last:
  
      return ret;
  
  }
  
  
  
  void mfmedia_ffprint(void *handle, int cnt, const char *format, va_list valist)
  
  {
  
      char *log_buf = (char *)malloc(38192);
  
      int length;
  
  
  
      if(log_buf)
  
      {
  
          time_t rawtime;
  
          time ( &amp;rawtime );
  
  
  
          length = vsprintf(log_buf ,format, valist);
  
          length += sprintf((log_buf + length), " : %s ", ctime (&amp;rawtime));
  
          *(log_buf + length) = 0x0;
  
  
  
          printf("%s", log_buf);
  
          fflush(stdout);
  
          free(log_buf);
  
      }
  
  }

  It is failing when I call avformat_write_header.

  From trace log (towards end) I see

  Setting default whitelist ’file,crypto’
   : Fri Jan 19 16:58:57 2018
  Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
   : Fri Jan 19 16:58:57 2018
  dimensions not set
   : Fri Jan 19 16:58:57 2018
  Cannot write header to stream : Invalid argument
  

  Please let me know why avformat_write_header is failing.

• FFMPEG libx264 on Ubuntu 16

  20 décembre 2019, par Kanza

  I have FFMPEG installed on my Ubuntu 16 but I want to use libx264 codec which I am unable to use. My current FFMPEG version is

  ffmpeg -version
  
  ffmpeg version N-90418-g74c6a6d Copyright (c) 2000-2018 the FFmpeg developers
  
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  
  configuration: --prefix= --enable-pic --disable-yasm --enable-shared
  
  libavutil      56. 11.100 / 56. 11.100
  
  libavcodec     58. 15.100 / 58. 15.100
  
  libavformat    58. 10.100 / 58. 10.100
  
  libavdevice    58.  2.100 / 58.  2.100
  
  libavfilter     7. 13.100 /  7. 13.100
  
  libswscale      5.  0.102 /  5.  0.102
  
  libswresample   3.  0.101 /  3.  0.101