[Libav-user] Trying to compile ffmpeg for iOS

[Wagner Patriota]

Thank you everybody... it worked! ;-)

On Tue, Mar 27, 2012 at 2:05 PM, Alex Cohn <alexcohn at netvision.net.il>wrote:

> On Tue, Mar 27, 2012 at 18:00, Wagner Patriota
> <wagner.patriota at gmail.com> wrote:
> > 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
>
> In your Smooth.cpp you should wrap #include "avformat.h" in extern "C"
> { ... }, same for other ffmpeg include files.
>
> Hope this helps,
> Alex Cohn
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