encoding flags trouble

    FLAGS="$FLAGS --enable-shared --disable-symver"
    FLAGS="$FLAGS --enable-small --optimization-flags=-O2"
    FLAGS="$FLAGS --disable-doc"
    FLAGS="$FLAGS --disable-ffmpeg"
    FLAGS="$FLAGS --disable-ffplay"
    FLAGS="$FLAGS --disable-ffprobe"
    FLAGS="$FLAGS --disable-ffserver"
    FLAGS="$FLAGS --disable-avdevice"
    FLAGS="$FLAGS --disable-swresample"
    FLAGS="$FLAGS --disable-swscale"
    FLAGS="$FLAGS --disable-postproc"
    FLAGS="$FLAGS --disable-avfilter"
    FLAGS="$FLAGS --disable-everything"
    FLAGS="$FLAGS --disable-gpl"

    # FFmpeg mp4/h264 decoding options
    # NOTES:
    # - "sdp" demuxer is required!
    FLAGS="$FLAGS --enable-demuxer=h264,sdp"
    FLAGS="$FLAGS --enable-parser=h264"
    FLAGS="$FLAGS --enable-decoder=h264"
    FLAGS="$FLAGS --enable-protocol=file"

    # FFmpeg mp4/h264 encoding options
    # NOTES:
    # - "libx264" is the h264 encoder!
    FLAGS="$FLAGS --enable-gpl"
    FLAGS="$FLAGS --enable-libx264"
    FLAGS="$FLAGS --enable-muxer=mp4,h264"
    FLAGS="$FLAGS --enable-swscale"
    FLAGS="$FLAGS --enable-swresample"

    FLAGS="$FLAGS --disable-debug"