[Libav-user] Trying to compile ffmpeg for iOS

[Wagner Patriota]

Thanks Gavin,

I am using the latest SDK and the latest FFMPEG..

I tried this:
./configure
--enable-static
--disable-shared
--enable-pic
--sysroot="*
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk
*"
--extra-ldflags="-arch armv7 -isysroot *
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk
* -miphoneos-version-min=*5.1*"
--enable-cross-compile
--arch=arm
--target-os=darwin
--cc="*
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc
*"
--cpu=cortex-a8
--extra-cflags="-arch armv7 -mfpu=neon -miphoneos-version-min=*5.1*"
--disable-debug
--enable-small
*--disable-asm*

based on your command, with some modifications in BOLD....

well.. it compiles... but when I try to link with my application I have:

Undefined symbols for architecture armv7:

  "__Z13avcodec_open2P14AVCodecContextP7AVCodecPP12AVDictionary",
referenced from:

      __Z4doItv in Smooth.o

  "__Z21avformat_write_headerP15AVFormatContextPP12AVDictionary",
referenced from:

      __Z4doItv in Smooth.o

  "__Z26av_interleaved_write_frameP15AVFormatContextP8AVPacket", referenced
from:

      __Z4doItv in Smooth.o

  "__Z7av_freePv", referenced from:

      __Z4doItv in Smooth.o

  "__Z10avio_flushP11AVIOContext", referenced from:

      __Z4doItv in Smooth.o

  "__Z15av_guess_formatPKcS0_S0_", referenced from:

      __Z4doItv in Smooth.o

  "__Z13av_dup_packetP8AVPacket", referenced from:

      __Z4doItv in Smooth.o

  "__Z15av_register_allv", referenced from:

      __Z4doItv in Smooth.o

  "__Z14av_dump_formatP15AVFormatContextiPKci", referenced from:

      __Z4doItv in Smooth.o

  "__Z14av_free_packetP8AVPacket", referenced from:

      __Z4doItv in Smooth.o

  "__Z20avcodec_find_decoder7CodecID", referenced from:

      __Z4doItv in Smooth.o

  "__Z10avio_closeP11AVIOContext", referenced from:

      __Z4doItv in Smooth.o


"__Z19avformat_open_inputPP15AVFormatContextPKcP13AVInputFormatPP12AVDictionary",
referenced from:

      __Z4doItv in Smooth.o

  "__Z16av_write_trailerP15AVFormatContext", referenced from:

      __Z4doItv in Smooth.o

  "__Z9avio_openPP11AVIOContextPKci", referenced from:

      __Z4doItv in Smooth.o

  "__Z13avcodec_closeP14AVCodecContext", referenced from:

      __Z4doItv in Smooth.o

  "__Z19avformat_new_streamP15AVFormatContextP7AVCodec", referenced from:

      __ZL17add_output_streamP15AVFormatContextP8AVStream in Smooth.o

  "__Z25avformat_find_stream_infoP15AVFormatContextPP12AVDictionary",
referenced from:

      __Z4doItv in Smooth.o

  "__Z8av_freepPv", referenced from:

      __Z4doItv in Smooth.o

  "__Z22avformat_alloc_contextv", referenced from:

      __Z4doItv in Smooth.o

  "__Z13av_read_frameP15AVFormatContextP8AVPacket", referenced from:

      __Z4doItv in Smooth.o

ld: symbol(s) not found for architecture armv7

clang: error: linker command failed with exit code 1 (use -v to see
invocation)

Any suggestion?

Thanks...




On Tue, Mar 27, 2012 at 9:23 AM, Gavin Kinsey <gkinsey at ad-holdings.co.uk>wrote:

> On Friday 23 March 2012 21:22:33 Wagner Patriota wrote:
> > Has anybody done it yet?
>
> Yes, haven't tested with the latest SDK yet but for 5.0 and below I have it
> working.
>
> > I am using the following commands:
> >
> <snip commands>
> >
> > But when I try to link my application with the libraries this above
> > script generates, I get the following:
> >
> > "ld: warning: ignoring file
> > /Users/Wagner/ffmpeg/ffmpeg/armv7/libavcodec.a, file was built for
> > archive which is not the architecture being linked (armv7)"
>
> Configure flags that I use (minus the disable/enable decoders and stuff I
> have
> which aren't relevant)
>
> configure --enable-static --disable-shared --enable-pic --
>
> sysroot="/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk"
> --extra-ldflags="-arch armv7 -isysroot
> /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk -
> miphoneos-version-min=4.0" --enable-cross-compile --arch=arm --target-
> os=darwin --
> cc="/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc" --
> cpu=cortex-a8 --extra-cflags="-arch armv7 -mfpu=neon -miphoneos-version-
> min=4.0" --disable-debug --enable-small
>
> I also have a small patch to work around Apple gcc brokenness, which I've
> attached.
>
> --
> Gavin Kinsey
> AD Holdings Plc
>
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