Recherche avancée

Sur d’autres sites (6518)

• decode FLAC file with avcodec_decode_audio4 not work well

  12 novembre 2015, par chaoqi

  I use FFmpeg to decode my flac file and write it to pcm file, then use GoldenWave to play it with pcm signed 16bit, little endian, mono and the total play time is ok.

  I doubt i write the 2 channel file in one place, but i don’t know how to get every signal channel and write it to pcm file.

  any help ? thank you.

  while (av_read_frame(fmt_ctx, &pkt) >= 0) {
  
              AVPacket orig_pkt = pkt;
  
              do {
  
                  ret = decode_packet(&got_frame, 0);
  
                  if (ret < 0)
  
                      break;
  
                  pkt.data += ret;
  
                  pkt.size -= ret;
  
              } while (pkt.size > 0);
  
              av_free_packet(&orig_pkt);
  
          }
  
  
  
          pkt.data = NULL;
  
          pkt.size = 0;
  
          do {
  
              decode_packet(&got_frame, 1);
  
              LOG("flush cached frames");
  
          } while (got_frame);
  
  
  
  
  
  
  
  static int decode_packet(int *got_frame, int cached)
  
  {
  
      int ret = 0;
  
      int decoded = pkt.size;
  
  
  
      *got_frame = 0;
  
  
  
      if (pkt.stream_index == audio_stream_idx) {
  
          ret = avcodec_decode_audio4(audio_dec_ctx, frame, got_frame, &pkt);
  
          if (ret < 0) {
  
              LOG("Error decoding audio frame (%s)\n", av_err2str(ret));
  
              return ret;
  
          }
  
  
  
          decoded = FFMIN(ret, pkt.size);
  
  
  
          if (*got_frame) {
  
              size_t unpadded_linesize = frame->nb_samples * av_get_bytes_per_sample(audio_dec_ctx->sample_fmt);
  
              //decode packet  nb_samples:4608, xx:2, unpadded_linesize: 9216
  
              LOG("decode packet  nb_samples:%d, xx:%d, unpadded_linesize: %d",
  
                      frame->nb_samples, av_get_bytes_per_sample(audio_dec_ctx->sample_fmt), unpadded_linesize);
  
              fwrite(frame->extended_data[0], 1, unpadded_linesize, audio_dst_file);
  
  
  
              //int nb_sample = frame->nb_samples;
  
  
  
              //fwrite(frame->extended_data[0], 1, nb_sample, audio_dst_file);
  
              //fwrite(frame->extended_data[0] + nb_sample, 1, nb_sample, audio_dst_file);
  
  
  
          }
  
      }
  
  
  
      if (*got_frame && api_mode == API_MODE_NEW_API_REF_COUNT)
  
          av_frame_unref(frame);
  
  
  
      return decoded;
  
  }

• Aforge FFMpeg DLL Location Issue

  4 novembre 2013, par Sam35

  I'm using AForge FFMPEG libraries for video compression in .Net.Currently I've put the ffmpeg & Aforge libraries in the location which the application(.exe) exists.

  I need to put these libraries in a common place.i've tried to put these libraries inside system32 folder. It is not working.

  Is there any ways to put the Aforge & FFMpeg Libraries in a common place other than application(.exe) directory ?

• C++/CLI — 0xc000007b (INVALID_IMAGE_FORMAT) with /clr option on

  9 mars 2015, par OverMachoGrande

  I’m trying to build a C++/CLI executable to which I statically link ffmpeg (libavcodec, libavformat, libavutil & swscale). It works fine if I build it normally (without /clr, so no CLR support), it works. However, when I add CLR support, it won’t start up with a 0xc000007b. A "Hello World" C++/CLI app runs fine, though.

  Supposedly the same thing happens with Boost::Threads, but since ffmpeg is pure C, I doubt it’s using Boost.

  My config :

  • Visual Studio 2008 Professional SP1
  • Windows XP Pro SP3 (x86)
  • .NET Framework 3.5 SP1

  Thanks,
  Robert