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• iPhone - A problem with decoding H264 using ffmpeg

  25 mars 2012, par HAPPY_TIGER

  I am working with ffmpeg to decode H264 stream from server.

  I referenced DecoderWrapper from http://github.com/dropcam/dropcam_for_iphone.

  I compiled it successfully, but I don't know how use it.

  Here are the function that has problem.

  - (id)initWithCodec:(enum VideoCodecType)codecType 
  
           colorSpace:(enum VideoColorSpace)colorSpace 
  
                width:(int)width 
  
               height:(int)height 
  
          privateData:(NSData*)privateData {
  
      if(self = [super init]) {
  
  
  
          codec = avcodec_find_decoder(CODEC_ID_H264);
  
          codecCtx = avcodec_alloc_context();
  
  
  
          // Note: for H.264 RTSP streams, the width and height are usually not specified (width and height are 0).  
  
          // These fields will become filled in once the first frame is decoded and the SPS is processed.
  
          codecCtx->width = width;
  
          codecCtx->height = height;
  
  
  
          codecCtx->extradata = av_malloc([privateData length]);
  
          codecCtx->extradata_size = [privateData length];
  
          [privateData getBytes:codecCtx->extradata length:codecCtx->extradata_size];
  
          codecCtx->pix_fmt = PIX_FMT_YUV420P;
  
  #ifdef SHOW_DEBUG_MV
  
          codecCtx->debug_mv = 0xFF;
  
  #endif
  
  
  
          srcFrame = avcodec_alloc_frame();
  
          dstFrame = avcodec_alloc_frame();
  
  
  
          int res = avcodec_open(codecCtx, codec);
  
          if (res < 0)
  
          {
  
              NSLog(@"Failed to initialize decoder");
  
          }
  
      }
  
  
  
      return self;    
  
  }

  What is the privateData parameter of this function ? I don't know how to set the parameter...

  Now avcodec_decode_video2 returns -1 ;

  The framedata is coming successfully.

  How solve this problem.

  Thanks a lot.

• FFMPEG iPhone using gas-preprocessor

  5 mars 2012, par user308990

  I got the latest version of FFMPEG and gas-preprocessor, and i am trying to build them libraries for iPhone. I put the gas-preprocessor.pl file in my usr/bin folder, and try to configure my ffmpeg with this command.

  ./configure —cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin9-gcc-4.2.1 —as='gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin9-gcc-4.2.1' —sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.1.sdk —enable-cross-compile —target-os=darwin —arch=arm —cpu=cortex-a8 —enable-pic

  But what i get is this error

  Unknown option "—as=gas-preprocessor.pl".
  See ./configure —help for available options.

  Any ideas ??? Thank u.

• Errors compiling ffmpeg for iPhone

  20 juillet 2013, par simon.d

  I'm on OS X Lion and I'm trying to compile the armv7 libraries of ffmpeg for the iPhone. I'm using ffmpeg 0.10.

  Here's my configure line :

  ./configure --disable-doc --disable-ffmpeg --disable-ffplay --disable-ffserver --disable-ffprobe --enable-cross-compile --arch=arm --target-os=darwin --cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc --as='gas-preprocessor/gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc' --sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk --cpu=cortex-a8 --extra-cflags='-arch armv7' --extra-ldflags='-arch armv7 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk' --enable-pic --disable-avdevice --disable-avfilter --disable-zlib --disable-bzlib

  Configure runs fine although it ends with : WARNING : Compiler does not indicate floating-point ABI, guessing soft.

  Here are my make results :

  Users-MacBook-Pro:ffmpeg-0.10 user$ make
  
  CC    libavformat/4xm.o
  
  CC    libavformat/a64.o
  
  CC    libavformat/aacdec.o
  
  CC    libavformat/ac3dec.o
  
  CC    libavformat/act.o
  
  CC    libavformat/adtsenc.o
  
  CC    libavformat/adxdec.o
  
  CC    libavformat/aea.o
  
  CC    libavformat/aiffdec.o
  
  CC    libavformat/aiffenc.o
  
  CC    libavformat/allformats.o
  
  CC    libavformat/amr.o
  
  CC    libavformat/anm.o
  
  CC    libavformat/apc.o
  
  CC    libavformat/ape.o
  
  CC    libavformat/apetag.o
  
  CC    libavformat/applehttp.o
  
  CC    libavformat/applehttpproto.o
  
  CC    libavformat/asf.o
  
  CC    libavformat/asfcrypt.o
  
  error: invalid operand in inline asm: 'ldr   ${0:Q}, $1 
  
      ldr   ${0:R}, $2 
  
      '
  
  make: *** [libavformat/asfcrypt.o] Error 1
  
  Users-MacBook-Pro:ffmpeg-0.10 user$

  Any ideas ? Thanks !