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• gcc : Undefined Reference Error

  16 mars 2014, par jamie_y

  I would like to use a function 'ff_load_image' defined in ffmpeg/libavfilter/lavfutils.h.

  program.c

  #include "../ffmpeg/libavfilter/lavfutils.h"
  
  
  
  int main ()
  
  {
  
    uint8_t* data;
  
  
  
    int linesize, width, height, log_ctx;
  
  
  
    int i = ff_load_image(&data, &linesize, &width, &height, AV_PIX_FMT_RGB24, "blue.jpg", &log_ctx);
  
  }

  Running

  gcc -I$HOME/ffmpeg/include program.c -L$HOME/ffmpeg/lib -lavfilter -lavcodec -lavutil

  gives undefined reference errors.

  program.c: In function \u2018main\u2019:
  
  program.c:9: warning: passing argument 1 of \u2018ff_load_image\u2019 from incompatible pointer type
  
  ../ffmpeg/libavfilter/lavfutils.h:39: note: expected \u2018uint8_t **\u2019 but argument is of type \u2018uint8_t *\u2019
  
  program.c:9: warning: passing argument 2 of \u2018ff_load_image\u2019 makes pointer from integer without a cast
  
  ../ffmpeg/libavfilter/lavfutils.h:39: note: expected \u2018int *\u2019 but argument is of type \u2018int\u2019
  
  program.c:9: warning: passing argument 3 of \u2018ff_load_image\u2019 makes pointer from integer without a cast
  
  ../ffmpeg/libavfilter/lavfutils.h:39: note: expected \u2018int *\u2019 but argument is of type \u2018int\u2019
  
  program.c:9: warning: passing argument 4 of \u2018ff_load_image\u2019 makes pointer from integer without a cast
  
  ../ffmpeg/libavfilter/lavfutils.h:39: note: expected \u2018int *\u2019 but argument is of type \u2018int\u2019
  
  program.c:9: warning: passing argument 5 of \u2018ff_load_image\u2019 makes pointer from integer without a cast
  
  ../ffmpeg/libavfilter/lavfutils.h:39: note: expected \u2018enum AVPixelFormat *\u2019 but argument is of type \u2018int\u2019
  
  program.c:9: warning: passing argument 7 of \u2018ff_load_image\u2019 makes pointer from integer without a cast
  
  ../ffmpeg/libavfilter/lavfutils.h:39: note: expected \u2018void *\u2019 but argument is of type \u2018int\u2019
  
  /home/jamiey/ffmpeg/lib/libavfilter.a(lavfutils.o): In function `ff_load_image':
  
  /home/jamiey/ffmpeg/libavfilter/lavfutils.c:38: undefined reference to `av_register_all'
  
  /home/jamiey/ffmpeg/libavfilter/lavfutils.c:40: undefined reference to `av_find_input_format'
  
  /home/jamiey/ffmpeg/libavfilter/lavfutils.c:41: undefined reference to `avformat_open_input'
  
  /home/jamiey/ffmpeg/libavfilter/lavfutils.c:66: undefined reference to `av_read_frame'
  
  /home/jamiey/ffmpeg/libavfilter/lavfutils.c:92: undefined reference to `avformat_close_input'
  
  /home/jamiey/ffmpeg/libavfilter/lavfutils.c:92: undefined reference to `avformat_close_input'
  
  /home/jamiey/ffmpeg/libavfilter/lavfutils.c:92: undefined reference to `avformat_close_input'
  
  /home/jamiey/ffmpeg/lib/libavcodec.a(frame_thread_encoder.o): In function `ff_frame_thread_encoder_free':
  
  /home/jamiey/ffmpeg/libavcodec/frame_thread_encoder.c:225: undefined reference to `pthread_join'
  
  /home/jamiey/ffmpeg/lib/libavcodec.a(frame_thread_encoder.o): In function `ff_frame_thread_encoder_init':
  
  /home/jamiey/ffmpeg/libavcodec/frame_thread_encoder.c:200: undefined reference to `pthread_create'
  
  /home/jamiey/ffmpeg/lib/libavcodec.a(pthread_frame.o): In function `ff_frame_thread_free':
  
  /home/jamiey/ffmpeg/libavcodec/pthread_frame.c:575: undefined reference to `pthread_join'
  
  /home/jamiey/ffmpeg/lib/libavcodec.a(pthread_frame.o): In function `ff_frame_thread_init':
  
  /home/jamiey/ffmpeg/libavcodec/pthread_frame.c:705: undefined reference to `pthread_create'
  
  /home/jamiey/ffmpeg/lib/libavcodec.a(pthread_slice.o): In function `ff_slice_thread_init':
  
  /home/jamiey/ffmpeg/libavcodec/pthread_slice.c:220: undefined reference to `pthread_create'
  
  /home/jamiey/ffmpeg/lib/libavcodec.a(pthread_slice.o): In function `ff_slice_thread_free':
  
  /home/jamiey/ffmpeg/libavcodec/pthread_slice.c:118: undefined reference to `pthread_join'
  
  /home/jamiey/ffmpeg/lib/libavutil.a(rational.o): In function `av_d2q':
  
  /home/jamiey/ffmpeg/libavutil/rational.c:115: undefined reference to `log'
  
  /home/jamiey/ffmpeg/libavutil/rational.c:118: undefined reference to `floor'
  
  /home/jamiey/ffmpeg/lib/libavutil.a(eval.o): In function `eval_expr':
  
  /home/jamiey/ffmpeg/libavutil/eval.c:183: undefined reference to `trunc'
  
  /home/jamiey/ffmpeg/libavutil/eval.c:182: undefined reference to `ceil'
  
  /home/jamiey/ffmpeg/libavutil/eval.c:181: undefined reference to `floor'
  
  /home/jamiey/ffmpeg/libavutil/eval.c:241: undefined reference to `pow'
  
  /home/jamiey/ffmpeg/libavutil/eval.c:177: undefined reference to `exp'
  
  /home/jamiey/ffmpeg/libavutil/eval.c:176: undefined reference to `exp'
  
  /home/jamiey/ffmpeg/libavutil/eval.c:287: undefined reference to `pow'
  
  /home/jamiey/ffmpeg/libavutil/eval.c:278: undefined reference to `floor'
  
  /home/jamiey/ffmpeg/lib/libavutil.a(eval.o): In function `av_strtod':
  
  /home/jamiey/ffmpeg/libavutil/eval.c:112: undefined reference to `pow'
  
  /home/jamiey/ffmpeg/libavutil/eval.c:103: undefined reference to `pow'
  
  /home/jamiey/ffmpeg/libavutil/eval.c:109: undefined reference to `pow'
  
  /home/jamiey/ffmpeg/lib/libavutil.a(eval.o): In function `parse_primary':
  
  /home/jamiey/ffmpeg/libavutil/eval.c:394: undefined reference to `sinh'
  
  /home/jamiey/ffmpeg/libavutil/eval.c:395: undefined reference to `cosh'
  
  /home/jamiey/ffmpeg/libavutil/eval.c:396: undefined reference to `tanh'
  
  /home/jamiey/ffmpeg/libavutil/eval.c:397: undefined reference to `sin'
  
  /home/jamiey/ffmpeg/libavutil/eval.c:398: undefined reference to `cos'
  
  /home/jamiey/ffmpeg/libavutil/eval.c:399: undefined reference to `tan'
  
  /home/jamiey/ffmpeg/libavutil/eval.c:400: undefined reference to `atan'
  
  /home/jamiey/ffmpeg/libavutil/eval.c:401: undefined reference to `asin'
  
  /home/jamiey/ffmpeg/libavutil/eval.c:402: undefined reference to `acos'
  
  /home/jamiey/ffmpeg/libavutil/eval.c:403: undefined reference to `exp'
  
  /home/jamiey/ffmpeg/libavutil/eval.c:404: undefined reference to `log'
  
  /home/jamiey/ffmpeg/libavutil/eval.c:405: undefined reference to `fabs'
  
  collect2: ld returned 1 exit status

  However, I was successful in running functions in other library, such as the ones in "ffmpeg/libavcodec/avcodec.h". Why is this happening to "ffmpeg/libavfilter/lavfutils.h" ?

• Cronjob does not run launcher.sh [closed]

  4 novembre 2024, par Wessiez

  I want to Run a script after a reboot ;

  


  The Pythonscript that I want to run called baby.py :

  


  import os

os.system("ffplay -i home/pi/dir/anything.mp4 -loop 0 -fs")


  


  The launcher script :

  


  #!/bin/sh
# launcher.sh
# navigate to home directory, then to this directory, then execute python script, then back home

cd /
cd /home/pi/dir
sudo python3 baby.py
cd /


  


  And at last the crontab code :

  


  @reboot sh /home/pi/dir/launcher.sh >/home/pi/logs/cronlog 2>&1


  


  The problem is that after a reboot it shows a flash of the mp4, and then the screen goes black.
The cronlog gives an error as below :

  


  error: XDG_RUNTIME_DIR is invalid or not set in the environment.
Input #0, mpeg, from 'home/pi/dir/anything.mp4':f=0/0
  Duration: 00:00:14.02, start: 0.300300, bitrate: 6426 kb/s
  Stream #0:0[0x1bf]: Data: dvd_nav_packet
  Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x480 [SAR 32:27 DAR 16:9], 6000 kb/s, 29.97 fps, 29.97 tbr, 90k tbn
    Side data:
      cpb: bitrate max/min/avg: 6000000/0/0 buffer size: 1835008 vbv_delay: N/A
  Stream #0:2[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 320 kb/s
   1.01 A-V:  0.016 fd=   5 aq=   40KB vq=  992KB sq=    0B f=0/0


  


  What is wrong ? Do I have to at some timestamp in the baby.py script ?

  


  I tried to change the video in a .vob instead of the mp4. But the result is the same.

  


  When I run the script in a terminal : python3 home/pi/dir/baby.py, it works like it should.
When I run the sh launcher.sh command : the video plays, but there's no sound to it...

  


• FFmpeg for Android platform

  30 avril 2014, par Neeraj

  I am trying to create an android application that uses FFMpeg. For that, I downloaded the FFmpeg code(v 0.8.15) from http://www.ffmpeg.org/olddownload.html. And compiled the code as per instructions given at http://www.roman10.net/how-to-build-ffmpeg-for-android/

  As a result, .a files have been generated in Android/lib folder & .h files in android/include folder.

  But, when I try to create .so file of my Native code what uses this prebuilt FFmpeg library (.a files), it gives undefined reference errors.

  Please find my project’s code structure is given below.

  project path is /home/guest/Neeraj_temp/FFMpeg-Example

  At this path, I created two folders jni & prebuilt
  In prebuilt folder, I kept libavfilter.a, libavcodec.a, libavformat.a, libavutil.a, libswscale.a
  In jni folder, I kept one include folder that contains all .h folders (libavcodec, libavfilter, libavformat, libavutil, libswscale).

  api-example.c file is also kept in jni folder that uses FFmpeg’s APIs.
  & one Android.mk file in jni folder.

  Android.mk :-

  LOCAL_PATH:= $(call my-dir)
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE    := libFFmpeg
  
  LOCAL_C_INCLUDES := $(LOCAL_PATH)/FFMpeg/include
  
  LOCAL_SRC_FILES := api-example.c
  
  LOCAL_LDLIBS += -L$(LOCAL_PATH)/../prebuilt -lavfilter -lavutil -lavformat -lavcodec -lswscale
  
  include $(BUILD_SHARED_LIBRARY) 

  Error :

  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wavpack.c:689: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(wavpack.o): In function `wv_unpack_stereo':
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wavpack.c:604: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wavpack.c:608: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(wavpack.o):/home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wavpack.c:1215: more undefined references to `av_log' follow
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(wmavoice.o): In function `synth_block_fcb_acb':
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wmavoice.c:1359: undefined reference to `av_memcpy_backptr'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(wmavoice.o): In function `synth_frame':
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wmavoice.c:1441: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(wmavoice.o): In function `synth_superframe':
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wmavoice.c:1765: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(wmavoice.o): In function `wmavoice_decode_packet':
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wmavoice.c:1919: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(wmavoice.o): In function `wmavoice_decode_init':
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wmavoice.c:350: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wmavoice.c:373: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(wmavoice.o):/home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wmavoice.c:397: more undefined references to `av_log' follow
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(wnv1.o): In function `decode_frame':
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wnv1.c:81: undefined reference to `av_reverse'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(ws-snd1.o): In function `ws_snd_decode_frame':
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/ws-snd1.c:70: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/ws-snd1.c:83: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/ws-snd1.c:79: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(xan.o): In function `xan_decode_frame':
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/xan.c:568: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/xan.c:551: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(xan.o):/home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/xan.c:515: more undefined references to `av_log' follow
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(xan.o): In function `xan_unpack':
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/xan.c:178: undefined reference to `av_memcpy_backptr'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(xl.o): In function `decode_frame':
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/xl.c:60: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(xsubdec.o): In function `decode_frame'

  I have read a lot of blogs but still not able to get the solution. Kindly provide me the solution. How do I need to structure the code that I should not get these errors & get the code compiled.

  Thanks.