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• ffmpeg link errors when building on iPhone 4.3 SDK

  12 septembre 2011, par YuzaKen

  After a rather trying few days, I finally got ffmpeg to compile under Xcode 4 with SDK 4.3. The issue no is a series (39) link errors. They fall into at least two cases : assembly language routines and static arrays defined in header files. My believe is that it is generating C method names for the assembly routines while the .c files containing the reference to the routine is generating a different method name (munging).

  Undefined symbols for architecture armv7 :

    "_ff_vector_fmul_vfp", referenced from:
  
        _ff_dsputil_init_vfp in libavcodec.a(dsputil_init_vfp.o)
  
    "_main", referenced from:
  
        start in crt1.3.1.o
  
    "_av_solve_lls", referenced from:
  
        _ff_lpc_calc_coefs in libavcodec.a(lpc.o)
  
    "_ff_inv_aanscales", referenced from:
  
        _dct_quantize_trellis_c in libavcodec.a(mpegvideo_enc.o)
  
        _decode_frame in libavcodec.a(eamad.o)
  
        _tgq_decode_frame in libavcodec.a(eatgq.o)
  
        _tqi_decode_frame in libavcodec.a(eatqi.o)
  
    "_ff_add_pixels_clamped_armv6", referenced from:
  
        _ff_dsputil_init_armv6 in libavcodec.a(dsputil_init_armv6.o)
  
    "_ff_cga_palette", referenced from:
  
        _tmv_decode_frame in libavcodec.a(tmv.o)
  
    "_ff_svq1_inter_multistage_vlc", referenced from:
  
        _encode_block in libavcodec.a(svq1enc.o)
  
        _svq1_decode_init in libavcodec.a(svq1dec.o)
  
    "_ff_simple_idct_armv6", referenced from:
  
        _ff_dsputil_init_armv6 in libavcodec.a(dsputil_init_armv6.o)
  
    "_BZ2_bzDecompressInit", referenced from:
  
        _matroska_decode_buffer in libavformat.a(matroskadec.o)
  
    "_ff_put_pixels8_y2_arm", referenced from:
  
        _ff_put_pixels16_y2_arm in libavcodec.a(dsputil_init_arm.o)
  
        _dsputil_init_arm in libavcodec.a(dsputil_init_arm.o)
  
    "_ff_simple_idct_add_armv6", referenced from:

  ...and so on.

  Anyone with experience with ffmpeg on iPhone ? Successfully ?

• WMAV2 and FFMPEG on iPhone

  14 avril 2012, par user1333656

  Recently, I try to decode audio files on iPhone by using ffmpeg.
  Most audio formats are decoded properly but WMAV2 isn't.
  The decoded file(raw data) can be imported to sound editor like AUDACITY and it is playable but not clear and different with the original track.
  Is this related to ARM floating point ???

  Someone said VBR WMAV2 could cause this kind of prob.
  Can any body give me any clue for this prob ??

  • IOS 5.1
  • XCODE 4.3.1
  • OSX 10.7.3
  • ffmpeg 0.10.1

  configure options
  

       ./configure \
      —extra-ldflags=-L/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhon    eOS5.1.sdk/usr/lib/system \
      —disable-doc \
      —disable-ffserver \
      —enable-cross-compile \
      —arch=arm \
      —cpu=cortex-a8 \
      —target-os=darwin \
      —enable-neon \
      —cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc  \
      —as='gas-preprocessor.pl /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc'  \
      —sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk \
      —extra-cflags='-arch armv7 -mfpu=neon' \
      —extra-ldflags='-arch armv7 -mfpu=neon' \
      —enable-pic
  
   

• Decoding WMA with FFMPeg on iPhone

  3 novembre 2012, par Winston

  I'm using this function to decode audio, but there is no sound :

  int decodedBytes;
  
  decodedBytes = avcodec_decode_audio4(myData->pCodecCtx, myData->myFrame, &data_size, &myData->pkt);

  The data is successfully downloaded, but I don't know where to go from here, since there is no sound at all.