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• convert flv video file to m3u8 format with h264 and aac codec in ffmpeg

  27 avril 2017, par user2138489

  I want to convert a flv video file to a m3u8 container using AAC and H264 encoding in FFmpeg version 0.7.15. Can anyone help me on this?

  I used this command to convert to the m3u8 format, but it throws an error:

  cmd: ffmpeg -i sample.flv -b 1104k -s 320x240 -vcodec libx264 -ab 32 -ar 24000 -acodec libfaac final_video.m3u8

  Error:

  ffmpeg version 0.7.15, Copyright (c) 2000-2013 the FFmpeg developers
    built on Feb 22 2013 07:22:31 with gcc 4.4.5
    configuration: --enable-libdc1394 --prefix=/usr --extra-cflags='-Wall -g ' --cc='ccache cc' --enable-shared --enable-libmp3lame --enable-gpl --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm --enable-libtheora --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libspeex --enable-nonfree --disable-stripping --enable-avfilter --enable-libdirac --disable-decoder=libdirac --enable-libfreetype --enable-libschroedinger --disable-encoder=libschroedinger --enable-version3 --enable-libopenjpeg --enable-libvpx --enable-librtmp --extra-libs=-lgcrypt --disable-altivec --disable-armv5te --disable-armv6 --disable-vis
    libavutil    50. 43. 0 / 50. 43. 0
    libavcodec   52.123. 0 / 52.123. 0
    libavformat  52.111. 0 / 52.111. 0
    libavdevice  52.  5. 0 / 52.  5. 0
    libavfilter   1. 80. 0 /  1. 80. 0
    libswscale    0. 14. 1 /  0. 14. 1
    libpostproc  51.  2. 0 / 51.  2. 0
  [libspeex @ 0x93e6c60] Missing Speex header, assuming defaults.
  [flv @ 0x93e25e0] Estimating duration from bitrate, this may be inaccurate
  
  Seems stream 0 codec frame rate differs from container frame rate: 60.00 (60/1) -> 30.00 (60/2)
  Input #0, flv, from 'sample.flv':
    Metadata:
      duration        : 60
      creationdate    : Wed Apr 10 17:13:05
    Duration: 00:01:00.05, start: 0.000000, bitrate: N/A
      Stream #0.0: Video: h264 (Main), yuv420p, 320x240 [PAR 1:1 DAR 4:3], 30 tbr, 1k tbn, 60 tbc
      Stream #0.1: Audio: libspeex, 16000 Hz, 1 channels, s16
  WARNING: The bitrate parameter is set too low. It takes bits/s as argument, not kbits/s
  [NULL @ 0x93e3840] Unable to find a suitable output format for 'final_video.m3u8'
  final_video.m3u8: Invalid data found when processing input
  

• FFmpeg concat after overlay's (append)

  27 avril 2017, par Loïc Noest

  I have some video to witch i need to concat a header and add some overlay's, the problem is that i need to do the overlay's first becouse otherwise the time woundn't be correct, and only afterwards concat the header to the begining of the video

  ffmpeg -i talk.mp4  -i start_pancarte.png -i end_pancarte.png  -i logo_alpha.png  -i header.mp4-filter_complex\ 
  " overlay= enable='between(t,0,3.04)' [x];\
  [x] overlay = enable='between(t,495.64, 498.6)' [y];\
  [y] overlay=15:15:enable='between(t,3.04,495.64)'[c];\
  [c] concat " solution.mp4
  

  This obviously adds the header to the end and I need it in the front, how do I do this (in 1 command)?

• error LNK1120 : unresolved externals

  27 avril 2017, par Sanduni Wickramasinghe

  I am trying to build the following code. But it gives the error as "error LNK1120: 5 unresolved externals". I'm using C++ in Visual Studio 2013. Libraries are included properly. Error comes at avformat_open_input method. I'm using muxing in ffmpeg in my code. Please help.

  const char *url = "H:/Sanduni_projects/ad_2.mp4";
  
  AVFormatContext *s = NULL;
  int ret = avformat_open_input(&s, url, NULL, NULL);
  if (ret < 0)
      abort();
  
  AVDictionary *options = NULL;
  
  av_dict_set(&options, "video_size", "640x480", 0);
  av_dict_set(&options, "pixel_format", "rgb24", 0);
  
  if (avformat_open_input(&s, url, NULL, &options) < 0){
      abort();
  }
  
  av_dict_free(&options);
  
  AVDictionaryEntry *e;
  
  if (e = av_dict_get(options, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
      fprintf(stderr, "Option %s not recognized by the demuxer.\n", e->key);
      abort();
  }
  
  avformat_close_input(&s);
  

• How to convert live video stream to mp4 format stream using FFmpeg API [on hold]

  27 avril 2017, par krish

  Using FFmpeg API :ConvertLiveMediaTask

  ConvertLiveMedia(Stream inputStream, string inputFormat, Stream outputStream, string outputFormat, ConvertSettings settings);

  Requirement : want to convert video file from any format to mp4 format and conversion should happen on fly using ConvertLiveMedia API

  Please help me for this problem, I googled so many times i didnt get a solution for this.

  Here is my code

  const int megabyte = 1024 * 1024;
  
   static string theFilename = @"F:\BackUp\Short video clip-nature.avi";
  
   static string[] VideoExtension = { ".ac3", ".aiff", ".alaw", ".asf", ".ast", ".mp4", ".au", ".avi", ".caf"};
  
   static void Main(string[] args)
   {
       ChunkedData(theFilename, 0);
   }               
  
   private static void ChunkedData(string theFilename, long whereToStartReading = 0)
   {
        string extension = System.IO.Path.GetExtension(theFilename);
  
        Stream chunkStream = new MemoryStream();
  
        if (VideoExtension.Any(Vi => extension.Contains(Vi)))
        {
             FileStream fileStram = new FileStream(theFilename, FileMode.Open, FileAccess.Read);
  
             using (fileStram)
             {
                   byte[] buffer = new byte[megabyte];
  
                   fileStram.Seek(whereToStartReading, SeekOrigin.Begin);
  
                   int bytesRead = fileStram.Read(buffer, 0, megabyte);
  
                   while (bytesRead > 0)
                   {
                       // Here i receive and implement
                       chunkStream = StreamData(buffer, bytesRead, extension);
  
                       bytesRead = fileStram.Read(buffer, 0, megabyte);
                   }
            }
        }                          
   }               
  
   private static Stream StreamData(byte[] buffer, int bytesRead, string formate)
   {
      // Have no idea what to give for ConvertSettings, i simply pass a object
      ConvertSettings settings = new ConvertSettings();
  
      var ffmpeg = new FFMpegConverter();
  
      Stream inputStream = new MemoryStream(buffer);
  
      Stream outputStream = new MemoryStream();
  
      try
      {
         // Here im getting outputStream capacity = 0, length = 0, position =0.
         var task = ffmpeg.ConvertLiveMedia(inputStream, formate, outputStream, Format.mp4, settings );
         task.Start();
  
      }
      catch (Exception ex)
      {
            Console.WriteLine(ex.ToString());
      }
  
      return outputStream; 
  }
  

• FFMPEG concat video finished but the video missing

  27 avril 2017, par Thien Hoang

  I was concatenated video with FFMPEG. Here is code: ffmpeg -i "concat:video1.webm|video2.webm|video3.webm|video4.webm" -c copy output_video.webm

  After concatenate finished, I play the video but the video display only video1. It missing the video2, video3, video4. Although, The output_video.webm is full size. I don't know why? Please help me, How to fix it?

  Thank you so much, Bien