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• How to use x264 for encoding with ffmpeg ?

  21 mai 2014, par mmmaaak

  I tryed to use ffmpeg for encoding video/ But it fails on initialization of AVCodecContext annd AVCodec.
  What I do :

  _codec = avcodec_find_encoder(CODEC_ID_H264);
  
  _codecContext = avcodec_alloc_context3(_codec);
  
  _codecContext->coder_type = 0;
  
  _codecContext->me_cmp|= 1;
  
  _codecContext->me_method=ME_HEX;
  
  _codecContext->me_subpel_quality = 0;
  
  _codecContext->me_range = 16;
  
  _codecContext->gop_size = 12;
  
  _codecContext->scenechange_threshold = 40;
  
  _codecContext->i_quant_factor = 0.71;
  
  _codecContext->b_frame_strategy = 1;
  
  _codecContext->qcompress = 0.5;
  
  _codecContext->qmin = 2;
  
  _codecContext->qmax = 31;
  
  _codecContext->max_qdiff = 4;
  
  _codecContext->max_b_frames = 3;
  
  _codecContext->refs = 3;
  
  _codecContext->trellis = 1;
  
  _codecContext->width = format.biWidth;
  
  _codecContext->height = format.biHeight;
  
  _codecContext->time_base.num = 1;
  
  _codecContext->time_base.den = 30;
  
  _codecContext->pix_fmt = PIX_FMT_YUV420P; 
  
  _codecContext->chromaoffset = 0;
  
  _codecContext->thread_count =1;
  
  _codecContext->bit_rate = (int)(128000.f * 0.80f);
  
  _codecContext->bit_rate_tolerance = (int) (128000.f * 0.20f);
  
  int error = avcodec_open2(_codecContext, _codec, NULL);
  
  if(error<   )
  
  {
  
      std::cout<<"Open codec fail. Error "<code>

  In such way ii fails on avopen_codec2() with :

  Program received signal SIGSEGV, Segmentation fault.
  
  [Switching to Thread 0xae1fdb70 (LWP 30675)]
  
  0xb2eb2cbb in x264_param_default () from /usr/lib/libx264.so.120

  If i comment all AVCodecContext parameters settins - I have :

  [libx264 @ 0xac75edd0] invalid width x height (0x0)

  And avcodec_open retunrs negative value. Which steps, I’m doing, are wrong ?

  Thanks for any help (ffmpeg 0.10 && libx264 daily snapshot for yesterday)

• Error -138 returns "Error number -138 occurred"

  29 avril 2016, par bot1131357

  I am trying to create a program that listens for a period of time, and then times out so that it can return to work on other tasks and retry again later. Here is the code I am testing with :

  AVFormatContext *pFormatCtx = NULL;
  
  AVCodecContext *codecCtx = NULL;
  
  AVCodec *codec;
  
  int ret = 0;
  
  
  
  // Register all formats and codecs
  
  av_register_all();
  
  avformat_network_init(); // for network streaming
  
  
  
  AVDictionary *d = NULL;           // "create" an empty dictionary
  
  av_dict_set(&d, "timeout", "5", 0); // add an entry
  
  av_dict_set(&d, "rtsp_flags", "listen", 0); // add an entry
  
  
  
  char filename[100];
  
  sprintf_s(filename, sizeof(filename), "%s", "rtsp://127.0.0.1:8554/demo");
  
  
  
  
  
  //:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
  
  printf_s("Open video file.\n");
  
  // Open video file
  
  ret = avformat_open_input(&pFormatCtx, filename, NULL, &d);   // Returns -138 here 
  
  if (ret <0)
  
  {
  
      printf_s("Failed: cannot open input.\n");
  
      av_strerror(ret, errbuf, ERRBUFFLEN);
  
      fprintf(stderr, "avformat_open_input() fail: %s\n", errbuf);
  
      continue;
  
      //return -1; // Couldn't find stream information
  
  }

  In the listening mode, avformat_open_input() returns -138. Using av_strerror() gives the following explanation : "Error number -138 occurred"

  Is this an Easter egg ? What does -138 stand for ?

• playing an mp3 into a voice channel with discord.py

  12 décembre 2020, par Tanuj KS

  I'm trying to make a text-to-speech bot for people to use in no-mic-chats to speak into voice channels. I found other articles explaining this but most of them show the windows ffmpeg version but I am on a Mac. this is my code so far :

  


  @bot.command()
async def speak(ctx, message):
    tts = gtts.gTTS(message, lang="en")
    tts.save("text.mp3")
    if ctx.guild.voice_client:
        vc = ctx.guild.voice_client
    else:
        voice_channel = get(ctx.guild.voice_channels, name="Voice Lounge")
        vc = await voice_channel.connect()
    vc.play(source='text.mp3')


  


  This gives me the error :
discord.ext.commands.errors.CommandInvokeError: Command raised an exception: ClientException: ffmpeg was not found.

  


  Some people said to specify the FFMPEG.exe file but I do not see that. I downloaded the FFMPEG git from git clone https://git.ffmpeg.org/ffmpeg.git ffmpeg

  


  but I still get the error. other articles said to specify the executable but I can't find any ffmpeg.exe which I have to specify the path for.

  


  Thanks in advance