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• Nginx video streaming - ffmpeg convert to flv, but requsted is mp4

  18 juin 2012, par abrahab

  I am converting videos from different sources with ffmpeg to mp4 with libx264 codec.
  The following command (simplified) :
  ffmpeg -i 1.mp4 -y -f mp4 -vcodec libx264 -crf 28 -threads 2 -strict experimental -acodec aac -ab 56k -ar 44100 -ac 2 temp.mp4

  Then, I can not stream the output file (500 Internal Server Error) with nginx mp4-streaming solution (aka http pseudo streaming). My system administrator found, that if rename file to flv it stream well, so, seems the output file is not mp4, but flv ? Why ? How to correctly convert ? Or, please, suggest how to stream video properly ? I think that mp4 is much better then flv... therefore I choose mp4.

  In other words, the problem is to stream output file like mp4.

  ps i also need to be sure that this video will always work at ipad after convertation. thanks and sorry for my bad english.

  EDIT : I found that if convert video with the same string but without -vcodec libx264 - nginx can serve the output .mp4 file well. where may be the problem ?

• FFmpeg convert video to adaptive streaming and multiple audio track

  13 juin 2020, par user998405

  I have one mpeg video and this video consist of three audio track . And I want to convert this video to adaptive streaming. Here is the example command that used 
ffmpeg.exe -i c:\test\1.mpg  -c:a aac -strict experimental -map 0:v -map 0:a -c:v libx264 -s 854x480 -aspect 16:9 -f hls -hls_key_info_file enc.keyinfo -hls_list_size 1000000 -hls_time 2 c:\k854_out.m3u8

  



  Index.m3u8

  



   #EXTM3U
#EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=696000
854_out.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=1096000
1280_out.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=2096000
1920_out.m3u8


  



  Here my question how can I convert the adaptive streaming to support multiple audio track ?

  


• Streaming RTP with ffmpeg

  30 mars 2016, par Dmitry

  Im trying to stream audio via rtp over udp with ffmpeg (filename = "rtp://11.89.9.211:30000").
  Here is my code for server(which one is streaming, and I have deleted all checks from code for easy reading) :

      AVStream *stream = NULL;
  
      AVCodec *output_codec = NULL;
  
      int error;
  
      out_ifcx[i] = avformat_alloc_context();
  
      out_ifcx[i]->oformat = av_guess_format("rtp", NULL, NULL);
  
      avformat_alloc_output_context2(&out_ifcx[i], nullptr, "rtp", filename);
  
      avio_open(&(out_ifcx[i])->pb, filename, AVIO_FLAG_WRITE));
  
      av_strlcpy((out_ifcx[i])->filename, filename, sizeof((out_ifcx[i])->filename));
  
      output_codec = avcodec_find_encoder((in_ifcx[i])->streams[0]->codec->codec_id);
  
      stream = avformat_new_stream(out_ifcx[i], output_codec)
  
      out_iccx[i] = stream->codec;
  
      (out_iccx[i])->channels = OUTPUT_CHANNELS;
  
      (out_iccx[i])->channel_layout = av_get_default_channel_layout(OUTPUT_CHANNELS);
  
      (out_iccx[i])->sample_rate = in_iccx[i]->sample_rate;
  
      (out_iccx[i])->sample_fmt = AV_SAMPLE_FMT_S16;
  
      (out_iccx[i])->bit_rate = iccx[i]->bit_rate;
  
      if ((out_ifcx[i])->oformat->flags & AVFMT_GLOBALHEADER)
  
          (out_iccx[i])->flags |= CODEC_FLAG_GLOBAL_HEADER;
  
      avcodec_open2(out_iccx[i], output_codec, NULL)

  PS : out_iccx[i], in_iccx[i] - vector; out_ifcx[i] in_ifcx[i] - vector
  Problem with it is : when i`m trying to reach another computer in the same network this code gives an error

  udp_resolve_host: nodename nor servname provided, or not known

  Also, when i`m streaming to the same computer but on other port (I use not local host IP(127.0.0.1), but of this computer : 11.88.8.20), everything works perfect.
  I dont know why and how to fix it. Can anyone help, please ?