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• Pydub unable to locate ffprobe

  25 décembre 2022, par Recessive

  Here is the link to a similar question to this : Pydub (WindowsError : [Error 2] The system can not find the file specified)
Although in this one the problem is with ffmpeg, which I solved by setting the absolute path.

  


  After setting the absolute path for converter and/or ffmpeg with either :

  


  AudioSegment.converter = r'C:\ffmpeg\bin'

  


  or

  


  AudioSegment.ffmpeg = r'C:\ffmpeg\bin'

  


  I still get this error :

  


  


  C :\Program Files\Python36\lib\site-packages\pydub\utils.py:193 : RuntimeWarning : Couldn't find ffprobe or avprobe - defaulting to ffprobe, but may not work
warn("Couldn't find ffprobe or avprobe - defaulting to ffprobe, but may not work", RuntimeWarning)
Traceback (most recent call last) :
File "C :/Users/Sean/Desktop/vp/encode_audio/m4a_to_wav.py", line 4, in 
song = AudioSegment.from_file("pines.m4a", "m4a")
File "C :\Program Files\Python36\lib\site-packages\pydub\audio_segment.py", line 660, in from_file
info = mediainfo_json(orig_file)
File "C :\Program Files\Python36\lib\site-packages\pydub\utils.py", line 263, in mediainfo_json
res = Popen(command, stdin=stdin_parameter, stdout=PIPE, stderr=PIPE)
File "C :\Program Files\Python36\lib\subprocess.py", line 707, in init
restore_signals, start_new_session)
File "C :\Program Files\Python36\lib\subprocess.py", line 990, in _execute_child
startupinfo)
FileNotFoundError : [WinError 2] The system cannot find the file specified`

  


  


  I have ffmpeg in my path envvar. I also have libav in my path envvar, and installed libav and then pydub in the order specified at https://github.com/jiaaro/pydub#dependencies.

  


  Nothing I'm doing appears to be working, so any ideas or solutions would be greatly appreciated !

  


• Using FFmpeg programmatically with a proxy

  2 mai 2013, par William Seemann

  I'm trying to use FFmpeg with a proxy. The following code works if I comment out :

  setenv("http_proxy", "http://172.0.0.1:3128/", 1);

  The proxy server is an instance of Squid. I know the proxy server is working because I can use the same URL with VLC without any issues. With the proxy specified, the output from my code is always :

  Proxy path: http://172.0.0.1:3128/
  
  Metadata could not be retrieved -5 // indicates an IO Error
  
  setDataSource failed, rc is: -1

  I compiled FFmpeg with everything enabled. Can someone explain why this code doesn't work with a proxy ?

  #include 
  
  #include 
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  
  
  const int SUCCESS = 0;
  
  const int FAILURE = -1;
  
  
  
  typedef struct State {
  
      AVFormatContext *pFormatCtx;
  
      int             audio_stream;
  
      int             video_stream;
  
      AVStream        *audio_st;
  
      AVStream        *video_st;
  
  } State;
  
  
  
  int setDataSource(State** ps, const char* path) {
  
      State *state = *ps;
  
  
  
      if (state->pFormatCtx) {
  
          avformat_close_input(&amp;state->pFormatCtx);
  
      }
  
  
  
      int ret = 0;
  
  
  
      if ((ret = avformat_open_input(&amp;state->pFormatCtx, path, NULL, NULL)) != 0) {
  
          printf("Metadata could not be retrieved %d\n", ret);
  
          *ps = NULL;
  
          return FAILURE;
  
      }
  
  
  
      if (avformat_find_stream_info(state->pFormatCtx, NULL) &lt; 0) {
  
          printf("Metadata could not be retrieved\n");
  
          avformat_close_input(&amp;state->pFormatCtx);
  
          *ps = NULL;
  
          return FAILURE;
  
      }
  
  
  
      *ps = state;
  
      return SUCCESS;
  
  }
  
  
  
  const char* extractMetadata(State** ps, const char* key) {
  
      char* value = NULL;
  
  
  
      State *state = *ps;
  
  
  
      if (!state->pFormatCtx) {
  
          goto fail;
  
      }
  
  
  
      if (key) {
  
          if (av_dict_get(state->pFormatCtx->metadata, key, NULL, AV_DICT_IGNORE_SUFFIX)) {
  
              value = av_dict_get(state->pFormatCtx->metadata, key, NULL, AV_DICT_IGNORE_SUFFIX)->value;
  
          }
  
      }
  
  
  
      fail:
  
  
  
      return value;
  
  }
  
  
  
  int main(void) {
  
      setenv("http_proxy", "http://172.0.0.1:3128/", 1);
  
      unsetenv("no_proxy");
  
  
  
      const char *proxy_path = getenv("http_proxy");
  
  
  
      if (proxy_path) {
  
          printf("Proxy path: %s\n", proxy_path);
  
      } else {
  
          printf("No proxy specified\n");
  
      }
  
  
  
      av_register_all();
  
      avformat_network_init();
  
  
  
      State * state = av_mallocz(sizeof(State));
  
  
  
      int ret = setDataSource(&amp;state, "http://<some host="host">/song.mp3");
  
  
  
      if (ret == 0) {
  
          printf("setDataSource succedded!\n");
  
          printf("Artist: %s\n", extractMetadata(&amp;state, "artist"));
  
      } else {
  
          printf("setDataSource failed, rc is: %d\n", ret);
  
      }
  
  
  
      return EXIT_SUCCESS;
  
  }
  
  </some>

• Reading mp3 file using ffmpeg caues memory leaks, even after freeing it in main

  12 août 2020, par leonardltk1

  i am continuously reading mp3 files and processing them, but the memory keeps getting build up even though i freed it.

  


  At the bottom read_audio_mp3(), they are already freeing some variable.
why do i still face a memory build up and how do i deal with it ?

  


  following this code : https://rodic.fr/blog/libavcodec-tutorial-decode-audio-file/, i read mp3 using this function

  


      int read_audio_mp3(string filePath_str, const int sample_rate, 
      double** output_buffer, int &AUDIO_DURATION){
      const char* path = filePath_str.c_str();

      /* Reads the file header and stores information about the file format. */
        AVFormatContext* format = avformat_alloc_context();
        if (avformat_open_input(&format, path, NULL, NULL) != 0) {
            fprintf(stderr, "Could not open file '%s'\n", path);
            return -1;
        }

      /* Check out the stream information in the file. */
        if (avformat_find_stream_info(format, NULL) < 0) {
            fprintf(stderr, "Could not retrieve stream info from file '%s'\n", path);
            return -1;
        }

      /* find an audio stream. */
        int stream_index =- 1;
        for (unsigned i=0; inb_streams; i++) {
          if (format->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
            stream_index = i;
            break;
          }
        }
        if (stream_index == -1) {
            fprintf(stderr, "Could not retrieve audio stream from file '%s'\n", path);
            return -1;
        }
        AVStream* stream = format->streams[stream_index];

      // find & open codec
        AVCodecContext* codec = stream->codec;
        if (avcodec_open2(codec, avcodec_find_decoder(codec->codec_id), NULL) < 0) {
            fprintf(stderr, "Failed to open decoder for stream #%u in file '%s'\n", stream_index, path);
            return -1;
        }

      // prepare resampler
        struct SwrContext* swr = swr_alloc();
        av_opt_set_int(swr, "in_channel_count",  codec->channels, 0);
        av_opt_set_int(swr, "out_channel_count", 1, 0);
        av_opt_set_int(swr, "in_channel_layout",  codec->channel_layout, 0);
        av_opt_set_int(swr, "out_channel_layout", AV_CH_LAYOUT_MONO, 0);
        av_opt_set_int(swr, "in_sample_rate", codec->sample_rate, 0);
        av_opt_set_int(swr, "out_sample_rate", sample_rate, 0);
        av_opt_set_sample_fmt(swr, "in_sample_fmt",  codec->sample_fmt, 0);
        av_opt_set_sample_fmt(swr, "out_sample_fmt", AV_SAMPLE_FMT_DBL,  0);
        swr_init(swr);
        if (!swr_is_initialized(swr)) {
            fprintf(stderr, "Resampler has not been properly initialized\n");
            return -1;
        }

      /* Allocate an audio frame. */
        AVPacket packet;
        av_init_packet(&packet);
        AVFrame* frame = av_frame_alloc();
        if (!frame) {
          fprintf(stderr, "Error allocating the frame\n");
          return -1;
        }

      // iterate through frames
        *output_buffer = NULL;
        AUDIO_DURATION = 0;
        while (av_read_frame(format, &packet) >= 0) {
          // decode one frame
            int gotFrame;
            if (avcodec_decode_audio4(codec, frame, &gotFrame, &packet) < 0) {
              // free packet
                av_free_packet(&packet);
                break;
            }
            if (!gotFrame) {
              // free packet
                av_free_packet(&packet);
                continue;
            }
          // resample frames
            double* buffer;
            av_samples_alloc((uint8_t**) &buffer, NULL, 1, frame->nb_samples, AV_SAMPLE_FMT_DBL, 0);
            int frame_count = swr_convert(swr, (uint8_t**) &buffer, frame->nb_samples, (const uint8_t**) frame->data, frame->nb_samples);
          // append resampled frames to output_buffer
            *output_buffer = (double*) realloc(*output_buffer,
             (AUDIO_DURATION + frame->nb_samples) * sizeof(double));
            memcpy(*output_buffer + AUDIO_DURATION, buffer, frame_count * sizeof(double));
            AUDIO_DURATION += frame_count;
          // free buffer & packet
            av_free_packet(&packet);
            av_free( buffer );
        }

      // clean up
        av_frame_free(&frame);
        swr_free(&swr);
        avcodec_close(codec);
        avformat_free_context(format);

      return 0;
    }


  


  Main Script : MemoryLeak.cpp

  


      // imports&#xA;      #include <fstream>&#xA;      #include &#xA;      #include &#xA;      #include &#xA;      #include &#xA;      #include <iostream>&#xA;      #include <sstream>&#xA;      #include <vector>&#xA;      #include <sys></sys>time.h> &#xA;      extern "C"&#xA;      {&#xA;      #include <libavutil></libavutil>opt.h>&#xA;      #include <libavcodec></libavcodec>avcodec.h>&#xA;      #include <libavformat></libavformat>avformat.h>&#xA;      #include <libswresample></libswresample>swresample.h>&#xA;      }&#xA;      using namespace std;&#xA;&#xA;    int main (int argc, char ** argv) {&#xA;      string wavpath = argv[1];&#xA;      printf("wavpath=%s\n", wavpath.c_str());&#xA;&#xA;      printf("\n==== Params =====\n");&#xA;      // Init&#xA;        int AUDIO_DURATION;&#xA;        int sample_rate = 8000;&#xA;        av_register_all();&#xA;&#xA;      printf("\n==== Reading MP3 =====\n");&#xA;        while (true) {&#xA;            // Read mp3&#xA;              double* buffer;&#xA;              if (read_audio_mp3(wavpath, sample_rate, &amp;buffer, AUDIO_DURATION) != 0) {&#xA;                printf("Cannot read %s\n", wavpath.c_str());&#xA;                continue;&#xA;              }&#xA;&#xA;            /* &#xA;              Process the buffer for down stream tasks.&#xA;            */&#xA;&#xA;            // Freeing the buffer&#xA;            free(buffer);&#xA;        }&#xA;&#xA;      return 0 ;&#xA;    }&#xA;</vector></sstream></iostream></fstream>

  


  Compiling

  


      g++ -o ./MemoryLeak.out -Ofast -Wall -Wextra \
        -std=c++11 "./MemoryLeak.cpp" \
        -lavformat -lavcodec -lavutil -lswresample


  


  Running, by right my input an argument wav.scp that reads text file of all the mp3s.
But for easy to replicate purpose, i only read 1 file song.mp3 in and i keep re-reading it

  


  ./MemoryLeak.out song.mp3


  


  Why do i know i have memory leaks ?

  


  

  1. I was running up 32 jobs in parallel for 14 million files, and when i wake up in the morning, they were abruptly killed.

  


  2. I run htop and i monitor the progress when i re-run it, and i saw that the VIRT & RES & Mem are continuously increasing.

  


  


  


  Edit 1 :
My setup :

  


  


  ffmpeg version 2.8.15-0ubuntu0.16.04.1
built with gcc 5.4.0