编译ijkplayer，并添加rtsp、rtmp支持，解决无法播放、unknown、延迟问题_unknown rtp version 3

最近在研究利用ndk技术，实现FFmpeg解码解码视频文件、视频流，发现了B站的开源播放框架ijkplayer，真是太强大了，基于ijkplayer开发减少了许多移植FFmpeg的步骤。
首先当然是配置好环境，我的环境是ubuntu_1604+ndk12b+git，按照官方的步骤，在terminal里输入回车
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ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
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如果提示ruby 不存在则输入sudo apt-get install ruby回车，装完继续上面，
然后

sudo apt-get install yasm
sudo apt-get install git
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如果是centos系统可能会报nasm/yasm not found or too old异常，需要手动编译安装yasm：

1）下载：wget http://www.tortall.net/projects/yasm/releases/yasm-1.3.0.tar.gz

2）解压：tar zxvf yasm-1.3.0.tar.gz

3）切换路径： cd yasm-1.3.0

4）执行配置： ./configure

5）编译：make

6）安装：make install
7）创建软连接使系统识别：sudo ln -s /usr/local/bin/yasm /usr/bin/
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装完后需要创建新分支（当然也可以直接在master上操作）cd到ijkplayer目录，执行：

git checkout -B latest k0.7.7.1
./init-android.sh
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上面第一句话是创建分支，第二句是下载FFmpeg源码，源码较大，需要较长时间下载：

源码下载完成之后，需要配置编译选项，默认的编译选项是不支持rtsp协议的需要加入下面编译配置（文章最后面会附上完整的module.sh）：

export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-protocol=rtp"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-protocol=tcp"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-demuxer=rtsp"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-demuxer=sdp"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-demuxer=rtp"
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如果直接建立module.sh文件的话可能编译会不通过，需要使用ln命令，例如我修改好了的文件名为module-lite-rtsp-rtmp-hevc.sh，需要cd到…\ijkplayer\config目录，执行

rm module.sh
ln -s module-lite-rtsp-rtmp-hevc.sh module.sh
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两句命令后才能编译通过，否则会提示module.sh not found

然后修改ff_ffplay.c文件中的函数packet_queue_get_or_buffering
修改如下：

/**被修改函数
static int packet_queue_get_or_buffering(FFPlayer *ffp, PacketQueue *q, AVPacket *pkt, int *serial, int *finished)
{
    assert(finished);
    if (!ffp->packet_buffering)
        return packet_queue_get(q, pkt, 1, serial);

    while (1) {
        int new_packet = packet_queue_get(q, pkt, 0, serial);
        if (new_packet < 0)
            return -1;
        else if (new_packet == 0) {
            if (q->is_buffer_indicator && !*finished)
                ffp_toggle_buffering(ffp, 1);
            new_packet = packet_queue_get(q, pkt, 1, serial);
            if (new_packet < 0)
                return -1;
        }

        if (*finished == *serial) {
            av_packet_unref(pkt);
            continue;
        }
        else
            break;
    }

    return 1;
}*/
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->

//修改后的函数
static int packet_queue_get_or_buffering(FFPlayer *ffp, PacketQueue *q, AVPacket *pkt, int *serial, int *finished)
{
    while (1) {
    int new_packet = packet_queue_get(q, pkt, 1, serial);
    if (new_packet < 0)
    {
        new_packet = packet_queue_get(q, pkt, 0, serial);
        if(new_packet < 0)
        return -1;
    }
    else if (new_packet == 0) {
        if (!finished)
            ffp_toggle_buffering(ffp, 1);
        new_packet = packet_queue_get(q, pkt, 1, serial);
        if (new_packet < 0)
            return -1;
    }
    if (*finished == *serial) {
        av_free_packet(pkt);
        continue;
    }
    else
        break;
    }
    return 1;
}
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上面的修改完成后便可以开始编译了，cd 到…/ijkplayer/android/contrib
执行

./compile-ffmpeg.sh clean
./compile-ffmpeg.sh all

cd ..
./compile-ijk.sh all
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四条语句，其中第二条是编译FFmpeg源码的，时间比较漫长，
编译完成后，就可以将…\ijkplayer\android\下的ijkplayer工程import到androidstudio中去了，这个目录（as工程）就是ijkplayer的编译好的库+sample示例
最后，mediaPlayer需要设置如下属性用来降低延迟，

mediaPlayer.setOption(IjkMediaPlayer.OPT_CATEGORY_PLAYER, "framedrop", 60);
mediaPlayer.setOption(IjkMediaPlayer.OPT_CATEGORY_PLAYER, "max-fps", 0);
mediaPlayer.setOption(IjkMediaPlayer.OPT_CATEGORY_PLAYER, "fps", 30);
mediaPlayer.setOption(IjkMediaPlayer.OPT_CATEGORY_CODEC, "skip_loop_filter", 48);
mediaPlayer.setOption(IjkMediaPlayer.OPT_CATEGORY_PLAYER, "overlay-format", IjkMediaPlayer.SDL_FCC_YV12);
mediaPlayer.setOption(IjkMediaPlayer.OPT_CATEGORY_PLAYER, "packet-buffering", 0);
                    mediaPlayer.setOption(IjkMediaPlayer.OPT_CATEGORY_FORMAT, "fflags", "nobuffer");
mediaPlayer.setOption(IjkMediaPlayer.OPT_CATEGORY_FORMAT, "max-buffer-size", 1024);
mediaPlayer.setOption(IjkMediaPlayer.OPT_CATEGORY_PLAYER, "min-frames", 3);
mediaPlayer.setOption(IjkMediaPlayer.OPT_CATEGORY_PLAYER, "start-on-prepared", 1);
mediaPlayer.setOption(IjkMediaPlayer.OPT_CATEGORY_FORMAT, "probsize", "4096");
mediaPlayer.setOption(IjkMediaPlayer.OPT_CATEGORY_FORMAT, "analyzeduration", "2000000");
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完整的module.sh信息,基于module-lite.sh，保证so库不会很大：
下载地址：
http://download.csdn.net/detail/qq372848728/9781425

#! /usr/bin/env bash

#--------------------
# Standard options:
export COMMON_FF_CFG_FLAGS=
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --prefix=PREFIX"

# Licensing options:
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-gpl"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-version3"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-nonfree"

# Configuration options:
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-static"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-shared"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-small"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-runtime-cpudetect"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-gray"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-swscale-alpha"

# Program options:
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-programs"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-ffmpeg"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-ffplay"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-ffprobe"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-ffserver"

# Documentation options:
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-doc"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-htmlpages"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-manpages"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-podpages"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-txtpages"

# Component options:
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-avdevice"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-avcodec"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-avformat"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-avutil"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-swresample"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-swscale"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-postproc"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-avfilter"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-avresample"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-pthreads"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-w32threads"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-os2threads"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-network"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-dct"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-dwt"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-lsp"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-lzo"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-mdct"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-rdft"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-fft"

# Hardware accelerators:
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-d3d11va"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-dxva2"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-vaapi"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-vda"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-vdpau"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-videotoolbox"

# Individual component options:
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-everything"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-encoders"

# ./configure --list-decoders
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-decoders"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-decoder=aac"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-decoder=aac_latm"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-decoder=flv"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-decoder=h263"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-decoder=h263i"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-decoder=h263p"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-decoder=h264"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-decoder=mp3*"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-decoder=vp6"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-decoder=vp6a"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-decoder=vp6f"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-decoder=hevc"

export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-hwaccels"

# ./configure --list-muxers
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-muxers"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-muxer=mp4"

# ./configure --list-demuxers
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-demuxers"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-demuxer=aac"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-demuxer=concat"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-demuxer=data"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-demuxer=flv"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-demuxer=hls"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-demuxer=live_flv"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-demuxer=mov"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-demuxer=mp3"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-demuxer=mpegps"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-demuxer=mpegts"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-demuxer=mpegvideo"

export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-demuxer=rtsp"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-demuxer=sdp"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-demuxer=rtp"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-demuxer=hevc"

# ./configure --list-parsers
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-parsers"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-parser=aac"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-parser=aac_latm"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-parser=h264"

export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-parser=hevc"

# ./configure --list-bsf
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-bsfs"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-bsf=chomp"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-bsf=dca_core"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-bsf=dump_extradata"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-bsf=hevc_mp4toannexb"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-bsf=imx_dump_header"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-bsf=mjpeg2jpeg"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-bsf=mjpega_dump_header"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-bsf=mov2textsub"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-bsf=mp3_header_decompress"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-bsf=mpeg4_unpack_bframes"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-bsf=noise"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-bsf=remove_extradata"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-bsf=text2movsub"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-bsf=vp9_superframe"

# ./configure --list-protocols
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-protocols"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-protocol=async"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-protocol=bluray"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-protocol=concat"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-protocol=crypto"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-protocol=ffrtmpcrypt"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-protocol=ffrtmphttp"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-protocol=gopher"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-protocol=icecast"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-protocol=librtmp*"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-protocol=libssh"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-protocol=md5"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-protocol=mmsh"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-protocol=mmst"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-protocol=rtmp*"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-protocol=rtmp"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-protocol=rtmpt"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-protocol=udp"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-protocol=rtp"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-protocol=sctp"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-protocol=srtp"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-protocol=subfile"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-protocol=unix"

export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-protocol=tcp"

#
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-devices"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-filters"

# External library support:
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-iconv"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-audiotoolbox"
export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-videotoolbox"

# ...

# Advanced options (experts only):
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --cross-prefix=${FF_CROSS_PREFIX}-"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-cross-compile"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --sysroot=PATH"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --sysinclude=PATH"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --target-os=TAGET_OS"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --target-exec=CMD"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --target-path=DIR"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --toolchain=NAME"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --nm=NM"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --ar=AR"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --as=AS"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --yasmexe=EXE"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --cc=CC"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --cxx=CXX"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --dep-cc=DEPCC"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --ld=LD"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --host-cc=HOSTCC"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --host-cflags=HCFLAGS"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --host-cppflags=HCPPFLAGS"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --host-ld=HOSTLD"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --host-ldflags=HLDFLAGS"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --host-libs=HLIBS"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --host-os=OS"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --extra-cflags=ECFLAGS"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --extra-cxxflags=ECFLAGS"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --extra-ldflags=ELDFLAGS"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --extra-libs=ELIBS"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --extra-version=STRING"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --optflags=OPTFLAGS"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --build-suffix=SUFFIX"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --malloc-prefix=PREFIX"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --progs-suffix=SUFFIX"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --arch=ARCH"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --cpu=CPU"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-pic"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-sram"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-thumb"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-symver"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-hardcoded-tables"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-safe-bitstream-reader"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-memalign-hack"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-lto"

# Optimization options (experts only):
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-asm"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-altivec"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-amd3dnow"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-amd3dnowext"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-mmx"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-mmxext"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-sse"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-sse2"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-sse3"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-ssse3"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-sse4"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-sse42"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-avx"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-fma4"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-armv5te"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-armv6"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-armv6t2"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-vfp"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-neon"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-vis"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-inline-asm"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-yasm"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-mips32r2"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-mipsdspr1"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-mipsdspr2"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-mipsfpu"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-fast-unaligned"

# Developer options (useful when working on FFmpeg itself):
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-coverage"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-debug"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-debug=LEVEL"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-optimizations"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-extra-warnings"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-stripping"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --assert-level=level"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-memory-poisoning"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --valgrind=VALGRIND"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-ftrapv"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --samples=PATH"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-xmm-clobber-test"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-random"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-random"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --enable-random=LIST"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --disable-random=LIST"
# export COMMON_FF_CFG_FLAGS="$COMMON_FF_CFG_FLAGS --random-seed=VALUE"

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