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• Revision 29746 : Gestion de la file d’attente

  8 juillet 2009, par kent1@… — Log

  Gestion de la file d’attente

• How to open a .sw file using libav library in c language ?

  29 août 2018, par volatile

  I created a .sw(16 bit pcm) file by passing an audio file. Now I am trying to get back the original audio(.mp3) by passing the .sw file as an input to the following file.

  How can I read the .sw file content so that I can get back the mp3 file. Below is the code,

  #include 
  
  #include 
  
  #include 
  
  
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  
  
  #include <libavutil></libavutil>channel_layout.h>
  
  #include <libavutil></libavutil>common.h>
  
  #include <libavutil></libavutil>frame.h>
  
  #include <libavutil></libavutil>samplefmt.h>
  
  
  
  /* check that a given sample format is supported by the encoder */
  
  static int check_sample_fmt(const AVCodec *codec, enum AVSampleFormat sample_fmt)
  
  {
  
      const enum AVSampleFormat *p = codec->sample_fmts;
  
  
  
      while (*p != AV_SAMPLE_FMT_NONE) {
  
          if (*p == sample_fmt)
  
              return 1; 
  
          p++;
  
      }
  
      return 0;
  
  }
  
  
  
  /* just pick the highest supported samplerate */
  
  static int select_sample_rate(const AVCodec *codec)
  
  {
  
      const int *p;
  
      int best_samplerate = 0;
  
  
  
      if (!codec->supported_samplerates)
  
          return 44100;
  
  
  
      p = codec->supported_samplerates;
  
      while (*p) {
  
          if (!best_samplerate || abs(44100 - *p) &lt; abs(44100 - best_samplerate))
  
              best_samplerate = *p;
  
          p++;
  
      }
  
      return best_samplerate;
  
  }
  
  
  
  /* select layout with the highest channel count */
  
  static int select_channel_layout(const AVCodec *codec)
  
  {
  
      const uint64_t *p;
  
      uint64_t best_ch_layout = 0;
  
      int best_nb_channels   = 0;
  
  
  
      if (!codec->channel_layouts)
  
          return AV_CH_LAYOUT_STEREO;
  
  
  
      p = codec->channel_layouts;
  
      while (*p) {
  
          int nb_channels = av_get_channel_layout_nb_channels(*p);
  
  
  
          if (nb_channels > best_nb_channels) {
  
              best_ch_layout    = *p;
  
              best_nb_channels = nb_channels;
  
          }
  
          p++;
  
      }
  
      return best_ch_layout;
  
  }
  
  
  
  static void encode(AVCodecContext *ctx, AVFrame *frame, AVPacket *pkt,
  
                     FILE *output)
  
  {
  
      int ret;
  
  
  
     /* send the frame for encoding */
  
     ret = avcodec_send_frame(ctx, frame);
  
     if (ret &lt; 0) {
  
         fprintf(stderr, "Error sending the frame to the encoder\n");
  
         exit(1);
  
     }
  
  
  
     /* read all the available output packets (in general there may be any
  
      * number of them */
  
     while (ret >= 0) {
  
         ret = avcodec_receive_packet(ctx, pkt);
  
         if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
  
             return;
  
         else if (ret &lt; 0) {
  
             fprintf(stderr, "Error encoding audio frame\n");
  
             exit(1);
  
         }
  
  
  
         fwrite(pkt->data, 1, pkt->size, output);
  
         av_packet_unref(pkt);
  
     }
  
  }
  
  
  
  int main(int argc, char **argv)
  
  {
  
     const char *filename;
  
     const AVCodec *codec;
  
     AVCodecContext *c= NULL;
  
     AVFrame *frame;
  
     AVPacket *pkt;
  
     int i, j, k, ret;
  
     FILE *f;
  
     uint16_t *samples;
  
     float t, tincr;
  
  
  
     av_register_all();
  
     avcodec_register_all();
  
  
  
     if (argc &lt;= 1) {
  
         fprintf(stderr, "Usage: %s <output file="file">\n", argv[0]);
  
         return 0;
  
     }
  
     filename = argv[1];
  
  
  
     /* find the MP2 encoder */
  
     codec = avcodec_find_encoder(AV_CODEC_ID_MP3);
  
     if (!codec) {
  
         fprintf(stderr, "Codec not found\n");
  
         exit(1);
  
     }
  
  
  
     c = avcodec_alloc_context3(codec);
  
     if (!c) {
  
         fprintf(stderr, "Could not allocate audio codec context\n");
  
         exit(1);
  
     }
  
  
  
     /* put sample parameters */
  
     c->bit_rate = 64000;
  
  
  
     /* check that the encoder supports s16 pcm input */
  
     c->sample_fmt = AV_SAMPLE_FMT_S16P;
  
     if (!check_sample_fmt(codec, c->sample_fmt)) {
  
         fprintf(stderr, "Encoder does not support sample format %s",
  
                 av_get_sample_fmt_name(c->sample_fmt));
  
         exit(1);
  
     }
  
  
  
     /* select other audio parameters supported by the encoder */
  
     c->sample_rate    = select_sample_rate(codec);
  
     c->channel_layout = select_channel_layout(codec);
  
     c->channels       = av_get_channel_layout_nb_channels(c->channel_layout);
  
  
  
     /* open it */
  
     if (avcodec_open2(c, codec, NULL) &lt; 0) {
  
         fprintf(stderr, "Could not open codec\n");
  
         exit(1);
  
     }
  
  
  
     f = fopen(filename, "wb");
  
     if (!f) {
  
         fprintf(stderr, "Could not open %s\n", filename);
  
         exit(1);
  
     }
  
  
  
     /* packet for holding encoded output */
  
     pkt = av_packet_alloc();
  
     if (!pkt) {
  
         fprintf(stderr, "could not allocate the packet\n");
  
         exit(1);
  
     }
  
  
  
     /* frame containing input raw audio */
  
     frame = av_frame_alloc();
  
     if (!frame) {
  
         fprintf(stderr, "Could not allocate audio frame\n");
  
         exit(1);
  
     }
  
  
  
     frame->nb_samples     = c->frame_size;
  
     frame->format         = c->sample_fmt;
  
     frame->channel_layout = c->channel_layout;
  
  
  
     /* allocate the data buffers */
  
     ret = av_frame_get_buffer(frame, 0);
  
     if (ret &lt; 0) {
  
         fprintf(stderr, "Could not allocate audio data buffers\n");
  
         exit(1);
  
     }
  
  
  
     /* encode a single tone sound */
  
     t = 0;
  
     tincr = 2 * M_PI * 440.0 / c->sample_rate;
  
     for (i = 0; i &lt; 200; i++) {
  
         /* make sure the frame is writable -- makes a copy if the encoder
  
          * kept a reference internally */
  
         ret = av_frame_make_writable(frame);
  
         if (ret &lt; 0)
  
             exit(1);
  
         samples = (uint16_t*)frame->data[0];
  
  
  
         for (j = 0; j &lt; c->frame_size; j++) {
  
             samples[2*j] = (int)(sin(t) * 10000);
  
  
  
             for (k = 1; k &lt; c->channels; k++)
  
                 samples[2*j + k] = samples[2*j];
  
             t += tincr;
  
         }
  
         encode(c, frame, pkt, f);
  
     }
  
  
  
     /* flush the encoder */
  
     encode(c, NULL, pkt, f);
  
  
  
     fclose(f);
  
  
  
     av_frame_free(&amp;frame);
  
     av_packet_free(&amp;pkt);
  
     avcodec_free_context(&amp;c);
  
  
  
     return 0;
  
  }
  
  </output>

  I just want to know, where and how the .sw file is reading in the above audio encoding code ?

• PHP-FFMpeg not converting (error with ffmpeg)

  13 août 2016, par Magurean Dan Sergiu

  I have installed ffmpeg server side with all the dependencies, updated it. And then installed PHP-FFMpeg with Composer. Tested that ffmpeg is instaled with a ssh conexion.

  root@host [/opt/ffmpeg]# ffmpeg
  
  ffmpeg version N-81322-ge8b355a Copyright (c) 2000-2016 the FFmpeg developers
  
  built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-17)
  
  configuration: --disable-yasm
  
  libavutil      55. 28.100 / 55. 28.100
  
  libavcodec     57. 51.100 / 57. 51.100
  
  libavformat    57. 46.100 / 57. 46.100
  
  libavdevice    57.  0.102 / 57.  0.102
  
  libavfilter     6. 51.100 /  6. 51.100
  
  libswscale      4.  1.100 /  4.  1.100
  
  libswresample   2.  1.100 /  2.  1.100
  
  Hyper fast Audio and Video encoder
  
  usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options]     outfile}...
  
  
  
  Use -h to get full help or, even better, run 'man ffmpeg'

  But when I try to convert a video file with a php script it throws me a very long error.
  PHP Code :

  <?PHP
  
  include($_SERVER['DOCUMENT_ROOT']."/vendors/install/vendor/autoload.php");
  
  $ffmpeg = FFMpeg\FFMpeg::create();
  
  $video = $ffmpeg->open($_SERVER['DOCUMENT_ROOT'].'/resources/uploads/96048/ffd3c5e349fa5745159deef163b5c253.wmv');
  
  $video
  
         ->filters()
  
         ->synchronize();
  
  $format = new FFMpeg\Format\Video\X264();
  
  $format->on('progress', function ($video, $format, $percentage) {
  
      echo "$percentage % transcoded";});
  
  $video
  
        ->save($format,$_SERVER['DOCUMENT_ROOT'].'/resources/uploads/96048/ffd3c5e349fa5745159deef163b5c253.mp4');
  
  ?>

  Error displayed :

  <b>Fatal error</b>:  Uncaught exception 'Alchemy\BinaryDriver\Exception\ExecutionFailureException' with message 'ffmpeg failed to execute command '/usr/local/bin/ffmpeg' '-y' '-i' '/home/user/working/resources/uploads/23097/2efeb41a1a7085a1dbd469c4895ac23e.wmv' '-async' '1' '-metadata:s:v:0' 'start_time=0' '-threads' '12' '-vcodec' 'libx264' '-acodec' 'libfaac' '-b:v' '1000k' '-refs' '6' '-coder' '1' '-sc_threshold' '40' '-flags' '+loop' '-me_range' '16' '-subq' '7' '-i_qfactor' '0.71' '-qcomp' '0.6' '-qdiff' '4' '-trellis' '1' '-b:a' '128k' '-pass' '1' '-passlogfile' '/tmp/ffmpeg-passes57ad320a1b685j794u/pass-57ad320a1b716' '/home/user/working/resources/uploads/23097/2efeb41a1a7085a1dbd469c4895ac23e.mp4'' in /home/user/working/vendors/install/vendor/alchemy/binary-driver/src/Alchemy/BinaryDriver/ProcessRunner.php:100↵Stack trace:↵#0 /home/user/working/vendors/install/vendor/alchemy/binary-driver/src/Alchemy/BinaryDriver/ProcessRunner.php(72): Alchemy\BinaryDriver\ProcessRunner-&amp;gt;doExecutionFailure(''/usr/bin/ffmpe...')↵#1 / in <b>/home/user/working/vendors/install/vendor/php-ffmpeg/php-ffmpeg/src/FFMpeg/Media/Video.php</b> on line <b>168</b><br />↵"

  Then I have took the basic code displayed upwards and ran it directly through ssh.

  '/usr/local/bin/ffmpeg' '-y' '-i' '/home/user/working/resources/uploads/23097/2efeb41a1a7085a1dbd469c4895ac23e.wmv' '-async' '1' '-metadata:s:v:0' 'start_time=0' '-threads' '12' '-vcodec' 'libx264' '-acodec' 'libfaac' '-b:v' '1000k' '-refs' '6' '-coder' '1' '-sc_threshold' '40' '-flags' '+loop' '-me_range' '16' '-subq' '7' '-i_qfactor' '0.71' '-qcomp' '0.6' '-qdiff' '4' '-trellis' '1' '-b:a' '128k' '-pass' '1' '-passlogfile' '/tmp/ffmpeg-passes57ad320a1b685j794u/pass-57ad320a1b716' '/home/user/working/resources/uploads/23097/2efeb41a1a7085a1dbd469c4895ac23e.mp4'

  And this is the response I get :

  ffmpeg version N-81322-ge8b355a Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-17)
  
    configuration: --disable-yasm
  
    libavutil      55. 28.100 / 55. 28.100
  
    libavcodec     57. 51.100 / 57. 51.100
  
    libavformat    57. 46.100 / 57. 46.100
  
    libavdevice    57.  0.102 / 57.  0.102
  
    libavfilter     6. 51.100 /  6. 51.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  1.100 /  2.  1.100
  
  Guessed Channel Layout for Input Stream #0.0 : stereo
  
  Input #0, asf, from '/home/user/working/resources/uploads/23097/2efeb41a1a7085a1dbd469c4895ac23e.wmv':
  
    Metadata:
  
      SfOriginalFPS   : 299700
  
      WMFSDKVersion   : 11.0.6001.7000
  
      WMFSDKNeeded    : 0.0.0.0000
  
      comment         : Footage: Small World Productions, Inc; Tourism New Zealand | Producer: Gary F. Spradling | Music: Steve Ball
  
      title           : Wildlife in HD
  
      copyright       : © 2008 Microsoft Corporation
  
      IsVBR           : 0
  
      DeviceConformanceTemplate: AP@L3
  
    Duration: 00:00:30.09, start: 0.000000, bitrate: 6977 kb/s
  
      Stream #0:0(eng): Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz, 2 channels, fltp, 192 kb/s
  
      Stream #0:1(eng): Video: vc1 (Advanced) (WVC1 / 0x31435657), yuv420p, 1280x720, 5942 kb/s, 29.97 fps, 29.97 tbr, 1k tbn, 1k tbc
  
  Unknown encoder 'libx264'

  My question is what to do next ? I have wasted 3 days to make this work and this is the furthest I have come. How can I test if libx264 is installed corectly ? And if it is not installed corectly how cand I reinstal or make it work ?