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• how play ogg/ape/wv/wma using ffmpeg

  25 novembre 2013, par user2361120

  I'm trying decode ogg,ape,wma,wv file formats
  I have posted the code below, but I'm having too much noise at the output

   av_init_packet(&packet);
  
          fmt_ctx = avformat_alloc_context();
  
  
  
          if ((ret = avformat_open_input(&fmt_ctx, szfile, NULL, NULL)) < 0)
  
          {
  
              LOGE("Cannot open input file\n");
  
          }
  
          if ((ret = avformat_find_stream_info(fmt_ctx, NULL)) < 0)
  
          {
  
              LOGE("Cannot find stream information\n");
  
          }
  
  
  
          /* select the audio stream */
  
          ret = av_find_best_stream(fmt_ctx, AVMEDIA_TYPE_AUDIO, -1, -1, &dec, 0);
  
          if (ret < 0)
  
          {
  
              LOGE("Cannot find a audio stream in the input file\n");
  
          }
  
  
  
          audio_stream_index = ret;
  
          dec_ctx = fmt_ctx->streams[audio_stream_index]->codec;
  
  
  
          LOGE(" ogg code %d codec id%d\n",AV_CODEC_ID_VORBIS,dec_ctx->codec_id);
  
  
  
          LOGE("avcodec_find_decoder\n");
  
  
  
  
  
          dec = avcodec_find_decoder(dec_ctx->codec_id);
  
                          if (!dec) {
  
  
  
                __android_log_print(ANDROID_LOG_INFO, "BroovPlayer", "avcodec_find_decoder failed %d Name:%s\n", dec_ctx->codec_id, dec_ctx->codec_name);
  
  
  
  
  
                          }
  
  
  
  
  
          if ((ret = avcodec_open2(dec_ctx, dec, NULL)) < 0)
  
          {
  
              LOGE("Cannot open audio decoder\n");
  
          }
  
  
  
  
  
  
  
  
  
          //dec_ctx->sample_fmt = AV_SAMPLE_FMT_S16P;
  
          LOGS("Stage 5 sample fmt %d",dec_ctx->sample_fmt);
  
          LOGE("Stage 5");
  
          LOGD("........%d", packet.size);
  
          while (1)
  
          {
  
  
  
                 if ((ret = av_read_frame(fmt_ctx, &packet)) < 0)
  
                 {
  
                     //LOGE("Stage........... %d",ret);
  
                     break;
  
                 }
  
                 if (packet.stream_index == audio_stream_index)
  
                 {
  
                         avcodec_get_frame_defaults(frame);
  
                         got_frame = 0;
  
                        // LOGE("file size=%d packet_index=%d",packet.size,packet.dts);
  
  
  
  
  
                         ret = avcodec_decode_audio4(dec_ctx, frame, &got_frame, &packet);
  
                       //  LOGE("len=%d",ret);
  
                         if (ret < 0)
  
                         {
  
                             LOGE("Error decoding audio\n");
  
                             continue;
  
                         }
  
  
  
                         if (!got_frame) {
  
                                      /* stop sending empty packets if the decoder is finished */
  
                                      if (!packet.data && dec->capabilities & CODEC_CAP_DELAY)
  
                                          //flush_complete = 1;
  
                                      continue;
  
                                  }
  
  
  
                         if (got_frame)
  
                         {
  
                             // LOGE("begin frame decode\n");
  
                              int data_size = av_samples_get_buffer_size(NULL, dec_ctx->channels,frame->nb_samples,dec_ctx->sample_fmt, 1);
  
                             // LOGE("after frame decode\n");
  
  
  
                              jbyte *bytes = (*env)->GetByteArrayElements(env, array, NULL);
  
                              memcpy(bytes, frame->data[0], data_size); //
  
                              (*env)->ReleaseByteArrayElements(env, array, bytes, 0);
  
                              (*env)->CallVoidMethod(env, obj,play, array, data_size);
  
  
  
                         }
  
                         packet.size -= ret;
  
                         packet.data += ret;
  
                         packet.pts = AV_NOPTS_VALUE;
  
  
  
  
  
                   }
  
            }
  
  
  
                 av_free_packet(&packet);
  
  
  
  
  
  
  
              when ,i am playing ogg/ape/wv audio file format .
  
  
  
  
  
  
  
            please help me to minimize the noise, as less as possible

  or if any other approach is there to decode these file formats then please let me know

  thanks

• How to effectively kill a frozen subprocess in Python ?

  2 janvier 2014, par Konos5

  I am dealing with a rather odd issue.

  I've written a Python wrapper (in Python 2.6.6) for a year old version of ffmpeg. The problem is that given a very particular video, ffmpeg stops working normally (clunky output, full cpu usage, no end stage etc) and takes the python interpreter down with it.

  Now, if I run ffmpeg with my encoding options directly from a terminal and the problematic video as input, ffmpeg won't immediately respond to Ctrl-c. I'll have to wait for a hefty of 10 seconds or more before it exits and gives me back the prompt. However if I use a 'healthy' video instead, it will simply print Received signal 2: terminating. and gracefully exit.

  In the python wrapper I use p.kill() to no effect. The behavior is exactly the same a.k.a I have to wait 10 sec before the program exits. How can I immediately stop ffmpeg when it freezes with some problematic video ?

  Note that if I do a double Ctrl-c I get the prompt back immediately no matter what.

• Revision fe776ce61f : add range_check for fdct in vp10 Unify the style of fdct4() fdct8() fdct16() Ad

  29 août 2015, par Angie Chiang

  Changed Paths :
   Modify /test/test.mk

  
   Add /test/vp10_dct_test.cc

  
   Modify /vp10/encoder/dct.c

  
  
  add range_check for fdct in vp10

  Unify the style of fdct4() fdct8() fdct16()
  Add fdct32()
  Add range_check() at each stage
  Add unit test at ../../test/vp10_dct_test.cc

  Change-Id : I13f76d9046c3ea473c82024b09a5bc8662e2c28e