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• need help configuring ffmpeg to decode raw AAC with android ndk

  24 octobre 2016, par Matt Wolfe

  I’ve got an android app that gets raw AAC bytes from an external device and I want to decode that data but I can’t seem to get the decoder to work, yet ffmpeg seems to work fine for decoding an mp4 file that contains the same audio data (verified with isoviewer). Recently I was able to get this ffmpeg library on android to decode video frames from the same external device but audio won’t seem to work.

  Here is the ffmpeg output for the file with the same data :

  $ ffmpeg -i Video_2000-01-01_0411.mp4
  
  ffmpeg version 2.6.1 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.6.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-vda
  
    libavutil      54. 20.100 / 54. 20.100
  
    libavcodec     56. 26.100 / 56. 26.100
  
    libavformat    56. 25.101 / 56. 25.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 11.102 /  5. 11.102
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'AXON_Flex_Video_2000-01-01_0411.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 1
  
      compatible_brands: isom3gp43gp5
  
    Duration: 00:00:15.73, start: 0.000000, bitrate: 1134 kb/s
  
      Stream #0:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 8000 Hz, mono, fltp, 40 kb/s (default)
  
      Metadata:
  
        handler_name    : soun
  
      Stream #0:1(eng): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 1087 kb/s, 29.32 fps, 26.58 tbr, 90k tbn, 1k tbc (default)
  
      Metadata:
  
        handler_name    : vide

  Here is my ndk code for setting up and decoding the audio :

  jint ffmpeg_init(JNIEnv * env, jobject this) {
  
      audioCodec = avcodec_find_decoder(AV_CODEC_ID_AAC);
  
      if (!audioCodec) {
  
          LOGE("audio codec %d not found", AV_CODEC_ID_AAC);
  
          return -1;
  
      }
  
  
  
      audioContext = avcodec_alloc_context3(audioCodec);
  
      if (!audioContext) {
  
          LOGE("Could not allocate codec context");
  
          return -1;
  
      }
  
  
  
       int openRet = avcodec_open2(audioContext, audioCodec, NULL);
  
          if (openRet < 0) {
  
            LOGE("Could not open codec, error:%d", openRet);
  
            return -1;
  
          }
  
  
  
      audioContext->sample_rate = 8000;
  
      audioContext->channel_layout = AV_CH_LAYOUT_MONO;
  
      audioContext->profile = FF_PROFILE_AAC_LOW;
  
      audioContext->bit_rate = 48 * 1024;
  
      audioContext->sample_fmt = AV_SAMPLE_FMT_FLTP;
  
  
  
    //  unsigned char extradata[] = {0x15, 0x88}; 
  
    //  audioContext->extradata = extradata;
  
    //  audioContext->extradata_size = sizeof(extradata);
  
      audioFrame = av_frame_alloc();
  
      if (!audioFrame) {
  
          LOGE("Could not create audio frame");
  
          return -1;
  
      }
  
  }
  
  
  
  
  
  jint ffmpeg_decodeAudio(JNIEnv *env, jobject this, jbyteArray aacData, jbyteArray output, int offset, int len) {
  
  
  
      LOGI("ffmpeg_decodeAudio()");
  
      char errbuf[128];
  
      AVPacket avpkt = {0};
  
      av_init_packet(&avpkt);
  
      LOGI("av_init_packet()");
  
      int error, got_frame;    
  
      uint8_t* buffer = (uint8_t *) (*env)->GetByteArrayElements(env, aacData,0);
  
      uint8_t* copy = av_malloc(len);  
  
      memcpy(copy, &buffer[offset], len);
  
      av_packet_from_data(&avpkt, copy, len);
  
  
  
  
  
      if ((error = avcodec_decode_audio4(audioContext, audioFrame, &got_frame, &avpkt)) < 0) {
  
          ffmpeg_log_error(error);
  
          av_free_packet(&avpkt);
  
          return error;
  
      }
  
      if (got_frame) {
  
          LOGE("Copying audioFrame->extended_data to output jbytearray, linesize[0]:%d", audioFrame->linesize[0]);
  
          (*env)->SetByteArrayRegion(env, output, 0, audioFrame->linesize[0],  *audioFrame->extended_data);
  
      }
  
  
  
      return 0;
  
  
  
  }

  As you can see I’ve got an init function that opens the decoder and creates the context, these things all work fine, without error. However when I call avcodec_decode_audio4 I get an error :

  FFMPEG error : -1094995529, Invalid data found when processing input

  I’ve tried all sorts of combinations of AVCodecContext properties. I’m not sure which I need to set for the decoder to do it’s job but from reading online I should just need to set the channel layout and the sample_rate (which I’ve tried by themself). I’ve also tried setting the extradata/extradata_size parameters to that which should match the video settings per : http://wiki.multimedia.cx/index.php?title=MPEG-4_Audio
  But no luck.

  Since the device we’re getting packets from sends aac data that have no sound at the beginning (but are valid packets), I’ve tried to just send those since they definitely should decode correctly.

  Here is an example of the initial audio packets that are of silence :

   010c9eb43f21f90fc87e46fff10a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5dffe214b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4b4bbd1c429696969696969696969696969696969696969696969696969696969696969696969696969696969696969696969696969696969696969696969696969696969696969696969696969696969696969696969696978

  Note that the data shown above is just a hex encoding of the data that I’m putting in AVPacket, and it was sent from an external device to the android application. My application doesn’t have direct access to the file though so I need to decode the raw frames/samples as I get them. When I look at the audio track data in isoviewer I can see that the audio track’s first sample is the same data as what I got from the device that contained that file (thus, the external device is just sending me the sample’s raw data). I believe this data can be derived from reading stsz (sample size) box starting at stco (chunk offset) boxes from the mdat box of the file.

  Also, isoviewer shows the esds box as having the following :

  ESDescriptor{esId=0, streamDependenceFlag=0, URLFlag=0, oCRstreamFlag=0, streamPriority=0, URLLength=0, URLString='null', remoteODFlag=0, dependsOnEsId=0, oCREsId=0, decoderConfigDescriptor=DecoderConfigDescriptor{objectTypeIndication=64, streamType=5, upStream=0, bufferSizeDB=513, maxBitRate=32000, avgBitRate=32000, decoderSpecificInfo=null, audioSpecificInfo=AudioSpecificConfig{configBytes=1588, audioObjectType=2 (AAC LC), samplingFrequencyIndex=11 (8000), samplingFrequency=0, channelConfiguration=1, syncExtensionType=0, frameLengthFlag=0, dependsOnCoreCoder=0, coreCoderDelay=0, extensionFlag=0, layerNr=0, numOfSubFrame=0, layer_length=0, aacSectionDataResilienceFlag=false, aacScalefactorDataResilienceFlag=false, aacSpectralDataResilienceFlag=false, extensionFlag3=0}, configDescriptorDeadBytes=, profileLevelIndicationDescriptors=[[]]}, slConfigDescriptor=SLConfigDescriptor{predefined=2}}

  And the binary is this :

  00 00 00 30 65 73 64 73 00 00 00 00 03 80 80 80
  
  1f 00 00 00 04 80 80 80 14 40 15 00 02 01 00 00
  
  7d 00 00 00 7d 00 05 80 80 80 02 15 88 06 01 02

• Compile Shotdetect on CentOS 7

  14 septembre 2015, par BitLegacy01

  I’m migrating a service from a Debian server to a CentOS 7 one.

  The service needs the Shotdetect command (github , official site).

  I could not make it work on CentOS though I followed all steps :

  1. Compile ffmpeg compilation guide

     # ffmpeg
     
     ffmpeg version git-2015-08-21-7a806c6 Copyright (c) 2000-2015 the FFmpeg developers
     
       built with gcc 4.8.3 (GCC) 20140911 (Red Hat 4.8.3-9)
     
       configuration: --prefix=/root/ffmpeg_build --extra-cflags=-I/root/ffmpeg_build/include --extra-ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --pkg-config-flags=--static --enable-gpl --enable-nonfree --enable-libfdk-aac --enable-libfreetype --disable-libmp3lame --disable-libopus --disable-libvorbis --disable-libvpx --enable-libx264 --disable-libx265 --disable-lzma
     
       libavutil      54. 31.100 / 54. 31.100
     
       libavcodec     56. 58.100 / 56. 58.100
     
       libavformat    56. 40.101 / 56. 40.101
     
       libavdevice    56.  4.100 / 56.  4.100
     
       libavfilter     5. 36.100 /  5. 36.100
     
       libswscale      3.  1.101 /  3.  1.101
     
       libswresample   1.  2.101 /  1.  2.101
     
       libpostproc    53.  3.100 / 53.  3.100
     
     Hyper fast Audio and Video encoder
     
     usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

     2. Install needed packages

        # yum install gd-devel libxml2-devel libxslt-devel clang libvpx libvorbis

     3. Add pthread in the CMakeList file, in TARGET_LINK_LIBRARIES, because it throws an lpthread missing in linker error

     4. Compile Shotdetect

        # FFMPEG_DIR="/root/ffmpeg_build"  ./compile.sh cmd

  5.Lost in contemplation

  -- avformat library found: /root/ffmpeg_build/lib/libavformat.a
  
  -- avcodec library found: /root/ffmpeg_build/lib/libavcodec.a
  
  -- avutil library found: /root/ffmpeg_build/lib/libavutil.a
  
  -- swscale library found: /root/ffmpeg_build/lib/libswscale.a
  
  Found all FFmpeg libraries in /root/ffmpeg_build/lib/libavformat.a;/root/ffmpeg_build/lib/libavdevice.a;/root/ffmpeg_build/lib/libavcodec.a;/root/ffmpeg_build/lib/libavutil.a;/root/ffmpeg_build/lib/libswscale.a.
  
  -- Found GD: /usr/lib64/libgd.so
  
  Found libgd: /usr/lib64/libgd.so;/usr/lib64/libpng.so;/usr/lib64/libz.so;/usr/lib64/libjpeg.so in /usr/include
  
  Found libxml2: /usr/lib64/libxml2.so in /usr/include/libxml2
  
  Found libxslt: /usr/lib64/libxslt.so in /usr/include
  
  -- Configuring done
  
  -- Generating done
  
  -- Build files have been written to: /root/Shotdetect-master/build
  
  [ 71%] Built target shotdetect
  
  Linking CXX executable shotdetect-cmd
  
  /root/ffmpeg_build/lib/libavcodec.a(libfdk-aacdec.o): in the function « fdk_aac_decode_frame »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:323: undefined reference to « aacDecoder_Fill »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:329: undefined reference to « aacDecoder_DecodeFrame »
  
  /root/ffmpeg_build/lib/libavcodec.a(libfdk-aacdec.o): in the function « get_stream_info »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:88: undefined reference to « aacDecoder_GetStreamInfo »
  
  /root/ffmpeg_build/lib/libavcodec.a(libfdk-aacdec.o): in the function « fdk_aac_decode_close »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:201: undefined reference to « aacDecoder_Close »
  
  /root/ffmpeg_build/lib/libavcodec.a(libfdk-aacdec.o): in the function « fdk_aac_decode_init »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:214: undefined reference to « aacDecoder_Open »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:221: undefined reference to « aacDecoder_ConfigRaw »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:228: undefined reference to « aacDecoder_SetParam »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:252: undefined reference to « aacDecoder_SetParam »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:270: undefined reference to « aacDecoder_SetParam »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:277: undefined reference to « aacDecoder_SetParam »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:284: undefined reference to « aacDecoder_SetParam »
  
  /root/ffmpeg_build/lib/libavcodec.a(libfdk-aacdec.o):/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:291: encore plus de références indéfinies suivent vers « aacDecoder_SetParam »
  
  /root/ffmpeg_build/lib/libavcodec.a(libfdk-aacdec.o): in the function « fdk_aac_decode_init »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:261: undefined reference to « aacDecoder_AncDataInit »
  
  /root/ffmpeg_build/lib/libavcodec.a(libfdk-aacdec.o): in the function « fdk_aac_decode_flush »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:367: undefined reference to « aacDecoder_SetParam »
  
  /root/ffmpeg_build/lib/libavcodec.a(libfdk-aacenc.o): in the function « aac_encode_close »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacenc.c:97: undefined reference to « aacEncClose »
  
  /root/ffmpeg_build/lib/libavcodec.a(libfdk-aacenc.o): in the function « aac_encode_frame »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacenc.c:357: undefined reference to « aacEncEncode »
  
  /root/ffmpeg_build/lib/libavcodec.a(libfdk-aacenc.o): in the function « aac_encode_init »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacenc.c:114: undefined reference to « aacEncOpen »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacenc.c:123: undefined reference to « aacEncoder_SetParam »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacenc.c:130: undefined reference to « aacEncoder_SetParam »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacenc.c:138: undefined reference to « aacEncoder_SetParam »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacenc.c:172: undefined reference to « aacEncoder_SetParam »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacenc.c:179: undefined reference to « aacEncoder_SetParam »
  
  /root/ffmpeg_build/lib/libavcodec.a(libfdk-aacenc.o):/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacenc.c:197: encore plus de références indéfinies suivent vers « aacEncoder_SetParam »
  
  /root/ffmpeg_build/lib/libavcodec.a(libfdk-aacenc.o): in the function « aac_encode_init »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacenc.c:276: undefined reference to « aacEncEncode »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacenc.c:282: undefined reference to « aacEncInfo »
  
  /root/ffmpeg_build/lib/libavcodec.a(libx264.o): in the function « X264_frame »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:260: undefined reference to « x264_picture_init »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:262: undefined reference to « x264_bit_depth »
  
  /root/ffmpeg_build/lib/libavcodec.a(libx264.o): in the function « reconfig_encoder »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:246: undefined reference to « x264_encoder_reconfig »
  
  /root/ffmpeg_build/lib/libavcodec.a(libx264.o): in the function « X264_frame »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:283: undefined reference to « x264_encoder_encode »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:289: undefined reference to « x264_encoder_delayed_frames »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:283: undefined reference to « x264_encoder_encode »
  
  /root/ffmpeg_build/lib/libavcodec.a(libx264.o): in the function « reconfig_encoder »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:173: undefined reference to « x264_encoder_reconfig »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:178: undefined reference to « x264_encoder_reconfig »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:185: undefined reference to « x264_encoder_reconfig »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:205: undefined reference to « x264_encoder_reconfig »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:211: undefined reference to « x264_encoder_reconfig »
  
  /root/ffmpeg_build/lib/libavcodec.a(libx264.o):/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:191: encore plus de références indéfinies suivent vers « x264_encoder_reconfig »
  
  /root/ffmpeg_build/lib/libavcodec.a(libx264.o): in the function « X264_init_static »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:806: undefined reference to « x264_bit_depth »
  
  /root/ffmpeg_build/lib/libavcodec.a(libx264.o): in the function « X264_close »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:339: undefined reference to « x264_encoder_close »
  
  /root/ffmpeg_build/lib/libavcodec.a(libx264.o): in the function « X264_init »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:413: undefined reference to « x264_param_default »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:418: undefined reference to « x264_param_default_preset »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:440: undefined reference to « x264_param_parse »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:470: undefined reference to « x264_param_parse »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:514: undefined reference to « x264_levels »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:516: undefined reference to « x264_levels »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:540: undefined reference to « x264_param_parse »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:541: undefined reference to « x264_param_parse »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:542: undefined reference to « x264_param_parse »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:543: undefined reference to « x264_param_parse »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:601: undefined reference to « x264_param_apply_fastfirstpass »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:651: undefined reference to « x264_param_apply_profile »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:703: undefined reference to « x264_param_parse »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:705: undefined reference to « x264_param_parse »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:717: undefined reference to « x264_param_parse »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:735: undefined reference to « x264_encoder_open_148 »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:744: undefined reference to « x264_encoder_headers »
  
  /root/ffmpeg_build/lib/libavcodec.a(opusdec.o): in the function « opus_decode_subpacket »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/opusdec.c:379: undefined reference to « swr_is_initialized »
  
  /root/ffmpeg_build/lib/libavcodec.a(opusdec.o): in the function « opus_decode_frame »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/opusdec.c:220: undefined reference to « swr_is_initialized »
  
  /root/ffmpeg_build/lib/libavcodec.a(opusdec.o): in the function « opus_init_resample »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/opusdec.c:161: undefined reference to « swr_init »
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/opusdec.c:167: undefined reference to « swr_convert »
  
  /root/ffmpeg_build/lib/libavcodec.a(opusdec.o): in the function « opus_decode_frame »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/opusdec.c:234: undefined reference to « swr_convert »
  
  /root/ffmpeg_build/lib/libavcodec.a(opusdec.o): in the function « opus_flush_resample »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/opusdec.c:115: undefined reference to « swr_convert »
  
  /root/ffmpeg_build/lib/libavcodec.a(opusdec.o): in the function « opus_decode_subpacket »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/opusdec.c:411: undefined reference to « swr_close »
  
  /root/ffmpeg_build/lib/libavcodec.a(opusdec.o): in the function « opus_decode_flush »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/opusdec.c:614: undefined reference to « swr_close »
  
  /root/ffmpeg_build/lib/libavcodec.a(opusdec.o): in the function « opus_decode_close »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/opusdec.c:638: undefined reference to « swr_free »
  
  /root/ffmpeg_build/lib/libavcodec.a(opusdec.o): in the function « opus_decode_init »:
  
  /root/ffmpeg_sources/ffmpeg/libavcodec/opusdec.c:705: undefined reference to « swr_alloc »
  
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  
  make[2]: *** [shotdetect-cmd] Error 1
  
  make[1]: *** [CMakeFiles/shotdetect-cmd.dir/all] Error 2
  
  make: *** [all] Error 2

  I’ve done a lot of research about the above errors but I didn’t find any clue.

  How to compile successfully Shotdetect on CentOS7 ?

  Thanks to tryp here is a working CMakelist file :

  # CMake integration by Christian Frisson
  
  cmake_minimum_required(VERSION 2.8)
  
  PROJECT(shotdetect)
  
  
  
  SET(CMAKE_C_COMPILER "/usr/bin/clang")
  
  SET(CMAKE_CXX_COMPILER "/usr/bin/clang++")
  
  SET(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake")
  
  
  
  
  
  # Get git version information for automatic embedding in version string:
  
  
  
  include(GetGitRevisionDescription)
  
  get_git_head_revision(GIT_REFSPEC GIT_SHA1)
  
  # Take the first 12 characters of the SHA1 as short identifier:
  
  STRING(SUBSTRING ${GIT_SHA1} 0 11 GIT_SHA1_SHORT)
  
  configure_file("${CMAKE_CURRENT_SOURCE_DIR}/src/version.cc.in" "${CMAKE_CURRENT_BINARY_DIR}/version.cc" @ONLY)
  
  list(APPEND SOURCES "${CMAKE_CURRENT_BINARY_DIR}/version.cc" src/version.h)
  
  
  
  # Miscellaneous compilation options:
  
  
  
  OPTION(USE_WXWIDGETS "Compile GUI app with wxWidgets, otherwise commandline app" ON)
  
  OPTION(USE_POSTGRESQL "Compile with PostgreSQL support" OFF)
  
  
  
  # Dependency: pkg-config (required if cross-compiling with MXE)
  
  
  
  IF ( MINGW AND CMAKE_TOOLCHAIN_FILE)
  
      FIND_PACKAGE (PkgConfig)
  
      IF(NOT PKG_CONFIG_FOUND)
  
          MESSAGE(FATAL_ERROR "pkgconfig required for cross-compiling with MXE for windows")
  
      ENDIF()
  
      SET(PKG_CONFIG_EXECUTABLE ${PKG_CONFIG_EXECUTABLE} CACHE STRING "pkg-config")
  
  ENDIF()
  
  
  
  # Dependency: FFmpeg (required)
  
  
  
  FIND_PACKAGE( FFmpeg )
  
  IF ( MINGW AND CMAKE_TOOLCHAIN_FILE)
  
      PKG_CHECK_MODULES (FFMPEG_PKG REQUIRED libavcodec libavfilter libavutil libavdevice libavformat libavformat libswscale)
  
      IF (FFMPEG_PKG_FOUND)
  
          MESSAGE( "FFmpeg cflags found through pkg-config: ${FFMPEG_PKG_CFLAGS}" )
  
          MESSAGE( "FFmpeg ldflags found through pkg-config: ${FFMPEG_PKG_LDFLAGS}" )
  
          STRING(REGEX REPLACE ";" " " FFMPEG_PKG_CFLAGS "${FFMPEG_PKG_CFLAGS}")
  
          SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${FFMPEG_PKG_CFLAGS}")
  
          SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${FFMPEG_PKG_CFLAGS}")
  
          SET(FFMPEG_LIBRARIES ${FFMPEG_LIBRARY} ${FFMPEG_PKG_LDFLAGS})
  
          MESSAGE("FFMPEG_LIBRARIES ${FFMPEG_LIBRARIES}")
  
      ELSE (FFMPEG_PKG_FOUND)
  
          MESSAGE( FATAL_ERROR "FFmpeg cflags/ldflags not found through pkg-config." )
  
      ENDIF (FFMPEG_PKG_FOUND)
  
  ENDIF()
  
  IF(FFMPEG_LIBAVFORMAT_FOUND)
  
      MESSAGE(STATUS "avformat library found: ${FFMPEG_LIBAVFORMAT_LIBRARIES}")
  
  ELSE()
  
      MESSAGE(STATUS "avformat library not found.")
  
  ENDIF()
  
  IF(FFMPEG_LIBAVCODEC_FOUND)
  
      MESSAGE(STATUS "avcodec library found: ${FFMPEG_LIBAVCODEC_LIBRARIES}")
  
  ELSE()
  
      MESSAGE(STATUS "avcodec library not found.")
  
  ENDIF()
  
  IF(FFMPEG_LIBAVUTIL_FOUND)
  
      MESSAGE(STATUS "avutil library found: ${FFMPEG_LIBAVUTIL_LIBRARIES}")
  
  ELSE()
  
      MESSAGE(STATUS "avutil library not found.")
  
  ENDIF()
  
  IF(FFMPEG_LIBSWSCALE_FOUND)
  
      MESSAGE(STATUS "swscale library found: ${FFMPEG_LIBSWSCALE_LIBRARIES}")
  
  ELSE()
  
      MESSAGE(STATUS "swscale library not found.")
  
  ENDIF()
  
  IF(FFMPEG_FOUND)
  
      INCLUDE_DIRECTORIES(${FFMPEG_INCLUDE_DIR} ${FFMPEG_INCLUDE_DIRS})
  
      SET(FFMPEG_LIBRARIES "${FFMPEG_LIBRARIES};/root/ffmpeg_build/lib/libswresample.a;/root/ffmpeg_build/lib/libx264.a;/lib64/libdl.so.2;/root/ffmpeg_build/lib/libfdk-aac.a;/root/ffmpeg_build/lib/libswresample.a")
  
      MESSAGE("Found all FFmpeg libraries in ${FFMPEG_LIBRARIES}.")
  
  ELSE()
  
      MESSAGE(FATAL_ERROR "Some FFmpeg libraries are missing.")
  
  ENDIF()
  
  
  
  # Dependency: GD (required)
  
  
  
  FIND_PACKAGE(GD REQUIRED)
  
  IF ( MINGW AND CMAKE_TOOLCHAIN_FILE)
  
      EXEC_PROGRAM(${CMAKE_FIND_ROOT_PATH}/bin/gdlib-config ARGS "--cflags" OUTPUT_VARIABLE GD_PKG_CFLAGS) 
  
      EXEC_PROGRAM(${CMAKE_FIND_ROOT_PATH}/bin/gdlib-config ARGS "--libs" OUTPUT_VARIABLE GD_PKG_LDFLAGS)
  
      MESSAGE( "gd cflags found through gdlib-config: ${GD_PKG_CFLAGS}" )
  
      MESSAGE( "gd ldflags found through gdlib-config: ${GD_PKG_LDFLAGS}" )
  
      SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${GD_PKG_CFLAGS}")
  
      SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${GD_PKG_CFLAGS}")
  
      SET(GD_LIBRARIES ${GD_LIBRARY} ${GD_PKG_LDFLAGS})
  
      MESSAGE("GD_LIBRARIES ${GD_LIBRARIES}")
  
  ENDIF()
  
  IF(GD_FOUND)
  
      INCLUDE_DIRECTORIES(${GD_INCLUDE_DIR})
  
      MESSAGE("Found libgd: ${GD_LIBRARIES} in ${GD_INCLUDE_DIR}")
  
  ELSE()
  
      MESSAGE(FATAL_ERROR "Couldn't find libgd")
  
  ENDIF()
  
  
  
  # Dependency: libxml2 (required)
  
  
  
  FIND_PACKAGE(LibXml2 2.7 REQUIRED)
  
  IF ( MINGW AND CMAKE_TOOLCHAIN_FILE)
  
      PKG_CHECK_MODULES (LIBXML2_PKG REQUIRED libxml-2.0)
  
      IF (LIBXML2_PKG_FOUND)
  
          MESSAGE( "LibXml2 cflags found through pkg-config: ${LIBXML2_PKG_CFLAGS}" )
  
          MESSAGE( "LibXml2 ldflags found through pkg-config: ${LIBXML2_PKG_LDFLAGS}" )
  
          STRING(REGEX REPLACE ";" " " LIBXML2_PKG_CFLAGS "${LIBXML2_PKG_CFLAGS}")
  
          SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${LIBXML2_PKG_CFLAGS}")
  
          SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${LIBXML2_PKG_CFLAGS}")
  
          SET(LIBXML2_LIBRARIES ${LIBXML2_LIBRARY} ${LIBXML2_PKG_LDFLAGS})
  
          MESSAGE("LIBXML2_LIBRARIES ${LIBXML2_LIBRARIES}")
  
      ELSE (LIBXML2_PKG_FOUND)
  
          MESSAGE( FATAL_ERROR "LibXml2 cflags/ldflags not found through pkg-config." )
  
      ENDIF (LIBXML2_PKG_FOUND)
  
  ENDIF()
  
  IF(LIBXML2_FOUND)
  
      MESSAGE("Found libxml2: ${LIBXML2_LIBRARIES} in ${LIBXML2_INCLUDE_DIR}")
  
      INCLUDE_DIRECTORIES(${LIBXML2_INCLUDE_DIR})
  
  ELSE()
  
      MESSAGE(FATAL_ERROR "Couldn't find libxml2")
  
  ENDIF()
  
  
  
  # Dependency: libxslt (required)
  
  
  
  FIND_PACKAGE(LibXslt REQUIRED)
  
  IF(LIBXSLT_FOUND)
  
      MESSAGE("Found libxslt: ${LIBXSLT_LIBRARIES} in ${LIBXSLT_INCLUDE_DIR}")
  
      INCLUDE_DIRECTORIES(${LIBXSLT_INCLUDE_DIR})
  
  ELSE()
  
      MESSAGE(FATAL_ERROR "Couldn't find libxslt")
  
  ENDIF()
  
  
  
  # Dependency: wxWidgets (optional)
  
  IF(USE_WXWIDGETS)
  
      FIND_PACKAGE(wxWidgets)# COMPONENTS core base)
  
      IF(wxWidgets_FOUND)
  
          MESSAGE("Found wxWidgets: ${wxWidgets_LIBRARIES} in ${wxWidgets_INCLUDE_DIRS}")
  
          INCLUDE_DIRECTORIES(${wxWidgets_INCLUDE_DIRS})
  
          ADD_DEFINITIONS(-DWXWIDGETS)
  
          INCLUDE("${wxWidgets_USE_FILE}")
  
      ELSE()
  
          MESSAGE(FATAL_ERROR "Couldn't find wxWidgets. Set USE_WXWIDGETS to OFF or install wxWidgets.")
  
      ENDIF()
  
  ENDIF()
  
  
  
  # Dependency: PostgreSQL (optional)
  
  IF(USE_POSTGRESQL)
  
      FIND_PACKAGE(PostgreSQL)
  
      IF(PostgreSQL_FOUND)
  
          MESSAGE("Found PostgreSQL: ${PostgreSQL_LIBRARIES} in ${PostgreSQL_INCLUDE_DIR}")
  
          INCLUDE_DIRECTORIES(${PostgreSQL_INCLUDE_DIR})
  
      ELSE()
  
          MESSAGE(FATAL_ERROR "Couldn't find PostgreSQL. Set USE_POSTGRESQL to OFF or install PostgreSQL.")
  
      ENDIF()
  
  ENDIF()
  
  
  
  # shotdetect
  
  
  
  SET(TARGET_NAME "shotdetect")
  
  INCLUDE_DIRECTORIES(.)
  
  
  
  # shotdetect library
  
  
  
  SET(${TARGET_NAME}_LIBRARY_SRCS src/film.cc src/graph.cc src/image.cc src/shot.cc src/xml.cc)
  
  SET(${TARGET_NAME}_LIBRARY_HDRS  src/film.h src/graph.h src/image.h src/shot.h src/xml.h)
  
  IF(USE_POSTGRESQL)
  
      SET(${TARGET_NAME}_LIBRARY_SRCS ${${TARGET_NAME}_LIBRARY_SRCS} src/bdd.cc)
  
      SET(${TARGET_NAME}_LIBRARY_HDRS ${${TARGET_NAME}_LIBRARY_HDRS} src/bdd.h)
  
  ENDIF()
  
  ADD_LIBRARY(${TARGET_NAME} ${${TARGET_NAME}_LIBRARY_SRCS} ${${TARGET_NAME}_LIBRARY_HDRS})
  
  TARGET_LINK_LIBRARIES(${TARGET_NAME} ${FFMPEG_LIBRARIES} ${LIBXML2_LIBRARIES} ${LIBXSLT_LIBRARIES} ${GD_LIBRARIES} "pthread" "m" "z")
  
  IF(USE_WXWIDGETS AND wxWidgets_FOUND)
  
      TARGET_LINK_LIBRARIES(${TARGET_NAME} ${wxWidgets_LIBRARIES})
  
  ENDIF()
  
  IF(USE_POSTGRESQL AND PostgreSQL_FOUND)
  
      TARGET_LINK_LIBRARIES(${TARGET_NAME} ${PostgreSQL_LIBRARY})
  
  ENDIF()
  
  
  
  # shotdetect application: gui or commandline
  
  
  
  IF(APPLE)
  
      SET(APP_TYPE "MACOSX_BUNDLE")
  
  ELSEIF(WIN32)
  
      SET(APP_TYPE "WIN32")
  
  ENDIF()
  
  
  
  IF(USE_WXWIDGETS AND wxWidgets_FOUND)
  
      LIST(APPEND ${TARGET_NAME}_GUI_SRCS src/main.cc src/ui/dialog_help.cc src/ui/dialog_shotdetect.cc src/ui/process_video_thread.cc)
  
      LIST(APPEND ${TARGET_NAME}_GUI_HDRS src/ui/dialog_help.h src/ui/dialog_shotdetect.h src/ui/process_video_thread.h)
  
      ADD_EXECUTABLE(${TARGET_NAME}-gui ${APP_TYPE} ${SOURCES} ${${TARGET_NAME}_GUI_SRCS} ${${TARGET_NAME}_GUI_HDRS})
  
      TARGET_LINK_LIBRARIES(${TARGET_NAME}-gui ${TARGET_NAME})
  
      # Make this target optional to install:
  
      SET(TARGETS_TO_INSTALL ${TARGET_NAME}-gui)
  
  ELSE()
  
      LIST(APPEND ${TARGET_NAME}_COMMANDLINE_SRCS src/commandline.cc)
  
      ADD_EXECUTABLE(${TARGET_NAME}-cmd ${SOURCES} ${${TARGET_NAME}_COMMANDLINE_SRCS})
  
      TARGET_LINK_LIBRARIES(${TARGET_NAME}-cmd ${TARGET_NAME})
  
      # Make this target optional to install:
  
      SET(TARGETS_TO_INSTALL ${TARGET_NAME}-cmd)
  
  ENDIF()
  
  
  
  
  
  # Routines for installing shotdetect.
  
  # Taken from official documentation (http://www.cmake.org/cmake/help/cmake2.6docs.html#command:install)
  
  install( 
  
      TARGETS ${TARGETS_TO_INSTALL}
  
      RUNTIME DESTINATION bin
  
      LIBRARY DESTINATION lib
  
      ARCHIVE DESTINATION lib/static
  
  )

  the built binary will be in the built directory, you can move there and execute

  make install

  to make the binary system wide.

• Convert a video to MP4 (H.264/AAC) with ffmpeg

  5 décembre 2015, par user176455

  If I don’t make a mistake, Safari currently need MP4 (H.264/AAC) video encoded for the HTML5 <video></video> element.

  So I tried to convert a video to this format with ffmpeg. However when I enter the shell command ffmpeg -i video.flv video.mp4, the returned error is :

  Seems stream 0 codec frame rate
  differs from container frame rate :
  2000.00 (2000/1) -> 29.92 (359/12) Input #0, flv, from ’video.flv’ :
  Duration : 00:05:01.20, start :
  0.000000, bitrate : 66 kb/s
  Stream #0.0 : Video : h264, yuv420p, 320x240 [PAR 1:1 DAR 4:3], 66 kb/s,
  29.92 tbr, 1k tbn, 2k tbc
  Stream #0.1 : Audio : aac, 22050 Hz, stereo, s16 Output #0, mp4, to
  ’video.mp4’ :
  Stream #0.0 : Video : mpeg4, yuv420p, 320x240 [PAR 1:1 DAR 4:3],
  q=2-31, 200 kb/s, 90k tbn, 29.92 tbc
  Stream #0.1 : Audio : 0x0000, 22050 Hz, stereo, s16, 64 kb/s Stream
  mapping : Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1 Unsupported codec
  for output stream #0.1

  An AAC codec is required but I’m quite newbie with ubuntu and I dont really now how to fix this problem. I’m using Ubuntu 9.10 Karmik Koala (for amd64).

  Thank you very much. :)