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• libswresample : swr_convert() returns empty buffer

  11 septembre 2019, par Герман Лиманський

  I try to convert audio in format AV_SAMPLE_FMT_S32. I use swr_convert(), but out buffer still empty.

  // frame is decoded frame, rframe - is empty frame(out buffer)

      if (!main_context->resampler) {
  
                      main_context->resampler = 
  
                      swr_alloc_set_opts(main_context->resampler,
  
                      AV_CH_LAYOUT_STEREO,                    // output
  
                      AV_SAMPLE_FMT_S32,                      // output
  
                      44100,                                  // output
  
                      audio_codec_context->channel_layout,    // input
  
                      audio_codec_context->sample_fmt,        // input
  
                      audio_codec_context->sample_rate,       // input
  
                      0,
  
                      nullptr);
  
                  swr_init(main_context->resampler);
  
  
  
              }
  
  
  
              //int in_samples = frame->nb_samples;
  
              int out_samples = av_rescale_rnd(swr_get_delay(
  
                  main_context->resampler, 44100) + 44100,
  
                  44100,
  
                  44100,
  
                  AV_ROUND_UP);
  
  
  
              size_t buffSize = av_samples_alloc(rframe->data, NULL,audio_codec_context->channels, out_samples, AV_SAMPLE_FMT_S32, 0);
  
              int len = swr_convert(main_context->resampler, rframe->data, frame->nb_samples, (const uint8_t * *)frame->data, frame->nb_samples);
  
  //here.. rframe->data should have some data, but its empty
  
              while (len > 0)
  
              {
  
                  size_t size_ = rframe->nb_samples * av_get_bytes_per_sample(AV_SAMPLE_FMT_S32);
  
                  main_context->audio_buf.write(rframe->data[0], size_, 1);
  
  
  
                  len = swr_convert(main_context->resampler, rframe->data, frame->nb_samples, NULL, NULL);
  
              }

• tests/fate/vcodec : add dnxhr edge tests

  8 août 2016, par Mark Reid

  tests/fate/vcodec : add dnxhr edge tests
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] tests/fate/vcodec.mak
  • [DH] tests/ref/vsynth/vsynth1-dnxhd-edge1-hr
  • [DH] tests/ref/vsynth/vsynth1-dnxhd-edge2-hr
  • [DH] tests/ref/vsynth/vsynth1-dnxhd-edge3-hr
  • [DH] tests/ref/vsynth/vsynth2-dnxhd-edge1-hr
  • [DH] tests/ref/vsynth/vsynth2-dnxhd-edge2-hr
  • [DH] tests/ref/vsynth/vsynth2-dnxhd-edge3-hr
  • [DH] tests/ref/vsynth/vsynth3-dnxhd-edge1-hr
  • [DH] tests/ref/vsynth/vsynth3-dnxhd-edge2-hr
  • [DH] tests/ref/vsynth/vsynth3-dnxhd-edge3-hr
  • [DH] tests/ref/vsynth/vsynth_lena-dnxhd-edge1-hr
  • [DH] tests/ref/vsynth/vsynth_lena-dnxhd-edge2-hr
  • [DH] tests/ref/vsynth/vsynth_lena-dnxhd-edge3-hr

• Scheduled ffmpeg function gives thread.error and also fires ffmpeg too many times

  16 février 2016, par user2192778

  I want to record a clip of a radio stream every hour. Below is the code I am using to accomplish this so far.

      def sched(): # schedules a recording every hour
  
          def stream_record ():
  
              timeinfo = datetime.now().strftime('%Y%m%d_%H%M_%S%f')
  
              ffmpegEXE = "C:/path/to/ffmpeg.exe" 
  
              subprocess.call([ffmpegEXE, '-i', url, '-t', '00:07:00', 
  
              output_folder + timeinfo + '_' + str(start_minute) + 'url.mp3'], shell=True)
  
  
  
          i = 0
  
          while True:
  
  
  
          x = datetime.today()
  
          y=x.replace(day=x.day+1, hour=i, minute= start_minute, second=0, microsecond=0) 
  
          i = (i + 1) % 24
  
          delta_t=y-x
  
          secs=delta_t.seconds+1
  
          t = Timer(secs,stream_record)
  
          t.start()
  
  
  
  sched()

  Two things go wrong. (1) It will run, however an error reads :

  line X in (module)

  sched()

  line Y in sched

  t.start()

  line Z in start

  _start_new_thread(self.__bootstrap, ())

  thread.error : can’t start new thread

  And (2) when it runs, ffmpeg will initialize a recording anywhere from 5-15 times, saving many clips when I only want it to save one.

  How do I fix these errors and get ffmpeg to connect and record only one clip every hour ?

  I know this is an issue with the scheduling function ; the ffmpeg command works fine, as does the python script calling it.