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  • Undefined Reference - ffmpeg on android ndk

    28 décembre 2012, par Gabriel Simões

    I´ve spent many hours trying to figure out why I still get "undefined reference" when trying to link to ffmpeg.
    I´ve already read most if not all posts and sites about the subject, so I think I´m missing something little here and I hope you can help me.

    What I have :

    I´m using windows 7 + cygwin + crystax r4.
    I´ve compiled FFMPEG using RockPlayer's ffmpeg source plus some modifications I did (only to include / exclude demuxes, decoders, encoders, ...)
    After compiling, I get :

    • a new folder named armv5te, which includes :
    • a folder named "include" with all folders for each libs' .h
    • a folder named "lib" which includes all libs' .a
    • a shared library named libffmpeg.so (checked soname and it is libffmpeg)

    The shared library isn´t also placed on project/lib/armeabi/libffmpeg.so

    After compiling I tried to compile my project and link it. While my .cpp compiles ok, I get many undefined references.

    here is my build script :

    NDK=/cygdrive/c/Gabriel/Desenvolvimento/SDKs/Android/android-ndk-r4-crystax
    
PLATFORM=$NDK/build/platforms/android-8/arch-arm/
    
PREBUILT=$NDK/build/prebuilt/windows/arm-eabi-4.4.0
    

    

    
function build_one
    
{
    

    
./configure --target-os=linux \
    
    --prefix=$PREFIX \
    
    --enable-cross-compile \
    
    --extra-libs="-lgcc" \
    
    --arch=arm \
    
    --cc=$PREBUILT/bin/arm-eabi-gcc \
    
    --cross-prefix=$PREBUILT/bin/arm-eabi- \
    
    --nm=$PREBUILT/bin/arm-eabi-nm \
    
    --sysroot=$PLATFORM \
    
    --extra-cflags=" -O2 -fpic -DANDROID -DHAVE_SYS_UIO_H=1 -Dipv6mr_interface=ipv6mr_ifindex -fasm -Wno-psabi -fno-short-enums  -fno-strict-aliasing -finline-limit=300 $OPTIMIZE_CFLAGS " \
    
    --disable-shared \
    
    --enable-static \
    
    --extra-ldflags="-Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib  -nostdlib -lc -lm -ldl -llog" \
    
    --disable-stripping \
    
    --disable-debug \
    
    --disable-symver \
    
    --disable-ffprobe \
    
    --disable-devices \
    
    --disable-avfilter \
    
    --disable-swscale \
    
    --disable-ffplay \
    
    --disable-ffserver \
    
    --disable-network \
    
        (many more ...)
    
    --enable-asm \
    
    $ADDITIONAL_CONFIGURE_FLAG
    

    
#make clean
    
make  -j4 install
    

    
$PREBUILT/bin/arm-eabi-ar d libavcodec/libavcodec.a inverse.o
    

    
$PREBUILT/bin/arm-eabi-ld -rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib  -soname libffmpeg.so -shared -nostdlib  -z,noexecstack -Bsymbolic --whole-archive --no-undefined -o $PREFIX/libffmpeg.so libavcodec/libavcodec.a libavformat/libavformat.a libavutil/libavutil.a  -lc -lm -lz -ldl -llog  --warn-once  --dynamic-linker=/system/bin/linker $PREBUILT/lib/gcc/arm-eabi/4.4.0/libgcc.a
    

    
}
    

    
#arm v5
    
CPU=armv5te
    
OPTIMIZE_CFLAGS="-marm -march=$CPU"
    
PREFIX=./android/$CPU 
    
ADDITIONAL_CONFIGURE_FLAG=
    
build_one

    Here is my android.mk :

    LOCAL_PATH := $(call my-dir)
    

    
#declare the prebuilt library
    
include $(CLEAR_VARS)
    
LOCAL_MODULE := ffmpeg-prebuilt
    
LOCAL_SRC_FILES := $(LOCAL_PATH)/ffmpeg/android/armv5te/libffmpeg.so
    
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/ffmpeg/android/armv5te/include
    
LOCAL_PRELINK_MODULE := true 
    
include $(PREBUILT_SHARED_LIBRARY)
    

    
include $(CLEAR_VARS)
    
LOCAL_MODULE    := audiocodec
    
LOCAL_SRC_FILES := ffmpeg_audio.cpp
    
LOCAL_SHARED_LIBRARY := libffmpeg
    
LOCAL_C_INCLUDES := $(LOCAL_PATH)/ffmpeg/android/armv5te/include
    
LOCAL_LDLIBS    := -llog -ljnigraphics -lz -lm $(LOCAL_PATH)/ffmpeg/android/armv5te/libffmpeg.so
    
include $(BUILD_SHARED_LIBRARY)

    The result :

    Compile++ thumb: audiocodec <= /cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFM
    
PEG/jni/ffmpeg_audio.cpp
    
SharedLibrary  : libaudiocodec.so
    
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/obj/local/armeabi/objs/audi
    
ocodec/ffmpeg_audio.o: In function `Java_gabriel_audioslower_pro_ffmpegDecoder_r
    
eadSamples':
    
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/ffmpeg_audio.cpp:172: u
    
ndefined reference to `avcodec_decode_audio3(AVCodecContext*, short*, int*, AVPa
    
cket*)'
    
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/ffmpeg_audio.cpp:178: u
    
ndefined reference to `av_read_frame(AVFormatContext*, AVPacket*)'
    
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/obj/local/armeabi/objs/audi
    
ocodec/ffmpeg_audio.o: In function `Java_gabriel_audioslower_pro_ffmpegDecoder_s
    
eekToPosMS':
    
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/ffmpeg_audio.cpp:147: u
    
ndefined reference to `av_rescale_q(long long, AVRational, AVRational)'
    
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/ffmpeg_audio.cpp:150: u
    
ndefined reference to `av_seek_frame(AVFormatContext*, int, long long, int)'
    
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/ffmpeg_audio.cpp:151: u
    
ndefined reference to `avcodec_flush_buffers(AVCodecContext*)'
    
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/ffmpeg_audio.cpp:152: u
    
ndefined reference to `av_read_frame(AVFormatContext*, AVPacket*)'
    
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/obj/local/armeabi/objs/audi
    
ocodec/ffmpeg_audio.o: In function `Java_gabriel_audioslower_pro_ffmpegDecoder_c
    
loseFile':
    
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/ffmpeg_audio.cpp:82: un
    
defined reference to `avcodec_close(AVCodecContext*)'
    
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/ffmpeg_audio.cpp:83: un
    
defined reference to `av_free(void*)'
    
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/ffmpeg_audio.cpp:84: un
    
defined reference to `av_close_input_file(AVFormatContext*)'
    
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/obj/local/armeabi/objs/audi
    
ocodec/ffmpeg_audio.o: In function `Java_gabriel_audioslower_pro_ffmpegDecoder_o
    
penAudioFile':
    
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/ffmpeg_audio.cpp:37: un
    
defined reference to `av_open_input_file(AVFormatContext**, char const*, AVInput
    
Format*, int, AVFormatParameters*)'
    
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/ffmpeg_audio.cpp:44: un
    
defined reference to `av_find_stream_info(AVFormatContext*)'
    
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/ffmpeg_audio.cpp:52: un
    
defined reference to `avcodec_find_decoder(CodecID)'
    
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/ffmpeg_audio.cpp:60: un
    
defined reference to `avcodec_open(AVCodecContext*, AVCodec*)'
    
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/ffmpeg_audio.cpp:67: un
    
defined reference to `av_malloc(unsigned int)'
    
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/ffmpeg_audio.cpp:70: un
    
defined reference to `av_read_frame(AVFormatContext*, AVPacket*)'
    
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/obj/local/armeabi/objs/audi
    
ocodec/ffmpeg_audio.o: In function `JNI_OnLoad':
    
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/ffmpeg_audio.cpp:25: un
    
defined reference to `av_register_all()'
    
collect2: ld returned 1 exit status
    
make: *** [/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/obj/local/armeab
    
i/libaudiocodec.so] Error 1

    Something interesting is that some functions from ffmpeg, as av_register_all(), do now show up on the list of undefined references.

    Any ideas on what I can do to fix it ? I´ve spent 3 days trying to make things work ..
    Thanks !

  • ffmpeg : images to 29.97fps mpeg2, audio not sync [migrated]

    21 novembre 2011, par Andy Le

    I have spent a lot of time on this issue. Hope someone can help.

    I want to convert 3147 images + ac3 audio file into an mpeg2 video at 29.97fps (about 1m45s). My command :

    ~/ffmpeg/ffmpeg/ffmpeg -loop_input -t 105 -i v%4d.tga -i final.ac3 -vcodec mpeg2video -qscale 1 -s 400x400 -r 30000/1001 -acodec copy -y out.mpeg 2> out.txt

    However, the audio file ends before the frame sequence. Which means the video is slower then audio.

    I checked the output file with imageinfo and see :

    General
    
Complete name                    : out.mpeg
    
Format                           : MPEG-PS
    
File size                        : 7.18 MiB
    
Duration                         : 1mn 44s
    
Overall bit rate                 : 574 Kbps
    

    
Video
    
ID                               : 224 (0xE0)
    
Format                           : MPEG Video
    
Format version                   : Version 2
    
Format profile                   : Main@Main
    
Format settings, BVOP            : No
    
Format settings, Matrix          : Default
    
Format_Settings_GOP              : M=1, N=12
    
Duration                         : 1mn 44s
    
Bit rate mode                    : Variable
    
Bit rate                         : 103 Kbps
    
Width                            : 400 pixels
    
Height                           : 400 pixels
    
Display aspect ratio             : 1.000
    
Frame rate                       : 29.970 fps
    
Resolution                       : 8 bits
    
Colorimetry                      : 4:2:0
    
Scan type                        : Progressive
    
Bits/(Pixel*Frame)               : 0.021
    
Stream size                      : 1.29 MiB (18%)
    

    
Audio
    
ID                               : 128 (0x80)
    
Format                           : AC-3
    
Format/Info                      : Audio Coding 3
    
Duration                         : 1mn 44s
    
Bit rate mode                    : Constant
    
Bit rate                         : 448 Kbps
    
Channel(s)                       : 6 channels
    
Channel positions                : Front: L C R, Side: L R, LFE
    
Sampling rate                    : 44.1 KHz
    
Stream size                      : 5.61 MiB (78%)

    The log from ffmpeg shows many duplicate frames. But I don't know how to get rid of that.

    -loop_input is deprecated, use -loop 1
    
[image2 @ 0x9c17a80] max_analyze_duration 5000000 reached at 5000000
    
Input #0, image2, from 'v%4d.tga':
    
  Duration: 00:02:05.88, start: 0.000000, bitrate: N/A
    
    Stream #0:0: Video: targa, bgr24, 400x400, 25 fps, 25 tbr, 25 tbn, 25 tbc
    
-loop_input is deprecated, use -loop 1
    
[ac3 @ 0x9ca5420] max_analyze_duration 5000000 reached at 5014400
    
[ac3 @ 0x9ca5420] Estimating duration from bitrate, this may be inaccurate
    
Input #1, ac3, from 'Final.ac3':
    
  Duration: 00:20:10.68, start: 0.000000, bitrate: 447 kb/s
    
    Stream #1:0: Audio: ac3, 44100 Hz, 5.1(side), s16, 448 kb/s
    
Incompatible pixel format 'bgr24' for codec 'mpeg2video', auto-selecting format 'yuv420p'
    
[buffer @ 0x9c1e060] w:400 h:400 pixfmt:bgr24 tb:1/1000000 sar:0/1 sws_param:
    
[buffersink @ 0x9dd56c0] auto-inserting filter 'auto-inserted scale 0' between the filter 'src' and the filter 'out'
    
[scale @ 0x9c178e0] w:400 h:400 fmt:bgr24 -> w:400 h:400 fmt:yuv420p flags:0x4
    
[mpeg @ 0x9d58060] VBV buffer size not set, muxing may fail
    
Output #0, mpeg, to 'out.mpeg':
    
  Metadata:
    
    encoder         : Lavf53.21.0
    
    Stream #0:0: Video: mpeg2video, yuv420p, 400x400, q=2-31, 200 kb/s, 90k tbn, 29.97 tbc
    
    Stream #0:1: Audio: ac3, 44100 Hz, 5.1(side), 448 kb/s
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (targa -> mpeg2video)
    
  Stream #1:0 -> #0:1 (copy)
    
Press [q] to stop, [?] for help
    
frame=  267 fps=  0 q=1.0 size=     564kB time=00:00:08.87 bitrate= 520.6kbits/s dup=43 drop=0    
    
frame=  544 fps=542 q=1.0 size=    1186kB time=00:00:18.11 bitrate= 536.2kbits/s dup=89 drop=0    
    
frame=  821 fps=546 q=1.0 size=    1818kB time=00:00:27.36 bitrate= 544.3kbits/s dup=135 drop=0    
    
frame= 1098 fps=548 q=1.0 size=    2444kB time=00:00:36.60 bitrate= 547.0kbits/s dup=181 drop=0    
    
frame= 1376 fps=549 q=1.0 size=    3072kB time=00:00:45.87 bitrate= 548.5kbits/s dup=227 drop=0    
    
frame= 1653 fps=550 q=1.0 size=    3700kB time=00:00:55.12 bitrate= 549.9kbits/s dup=273 drop=0    
    
frame= 1930 fps=550 q=1.0 size=    4326kB time=00:01:04.36 bitrate= 550.6kbits/s dup=319 drop=0    
    
frame= 2208 fps=551 q=1.0 size=    4960kB time=00:01:13.64 bitrate= 551.8kbits/s dup=365 drop=0    
    
frame= 2462 fps=546 q=1.0 size=    5746kB time=00:01:22.11 bitrate= 573.2kbits/s dup=407 drop=0    
    
frame= 2728 fps=544 q=1.0 size=    6354kB time=00:01:30.99 bitrate= 572.1kbits/s dup=451 drop=0    
    
frame= 3007 fps=545 q=1.0 size=    6980kB time=00:01:40.28 bitrate= 570.2kbits/s dup=498 drop=0    
    
frame= 3146 fps=546 q=1.0 Lsize=    7352kB time=00:01:44.93 bitrate= 573.9kbits/s dup=521 drop=0    
    

    
video:1518kB audio:5745kB global headers:0kB muxing overhead 1.230493%

  • anyone had success with OpenFP ? [closed]

    30 mai 2013, par Robert Shaw

    http://sourceforge.net/projects/open-fp/

    Built and ran openfp - a sound fingerprinting project available in many places. Includes :
    openfp_extract (calls ffmpeg) _server and _match.

    Hours today fiddling with the samples but I always get MATCH RESULTS 0, even with identical afp files in the signatures directory. What is the trick to get a match ?

    Usings PCM 16 mono 22kHz . Do endian and signed matter as long as its always the same ?

    I hope to try and match bird or animal sounds, anybody think it can work ?

    Thanks in advance ! - Robert

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