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• Saving an animation using ffmpeg and matplotlib on anaconda3

  21 juin 2016, par Varsha Dyavaiah

  I am trying to create videos of NBA Action with Sportsvu data.

  I was following the steps given in this blog by Dan Vatterott :

  http://www.danvatterott.com/blog/2016/06/16/creating-videos-of-nba-action-with-sportsvu-data/?utm_campaign=Data%2BElixir&utm_medium=email&utm_source=Data_Elixir_84

  I am trying to create a animation and save it using ffmpeg and matplotlib.
  The code snippet is attached below.

   import matplotlib.animation as animation
  
   plt.rcParams['animation.ffmpeg_path'] = '/home/anaconda3/pkgs/ffmpeg-2.1.0-1/bin'
  
  
  
   fig = plt.figure(figsize=(15,7.5)) #create figure object
  
   ax = plt.gca() #create axis object
  
  
  
   draw_court([0,100,0,50]) #draw the court
  
   player_text = list(range(10)) #create player text vector
  
   player_circ = list(range(10)) #create player circle vector
  
   ball_circ = plt.Circle((0,0), 1.1, color=[1, 0.4, 0]) #create circle object for bal
  
   for i in list(range(10)): #create circle object and text object for each player
  
       col=['w','k'] if i<5 else ['k','w'] #color scheme
  
       player_circ[i] = plt.Circle((0,0), 2.2, facecolor=col[0],edgecolor='k') #player circle
  
       player_text[i] =   ax.text(0,0,'',color=col[1],ha='center',va='center') #player jersey # (text)
  
  
  
   ani = animation.FuncAnimation(fig, animate,  frames=np.arange(0,np.size(ball_xy,0)), init_func=init, blit=True, interval=5, repeat=False,\
  
                           save_count=0) #function for making video
  
  
  
   FFwriter = animation.FFMpegWriter()
  
   ani.save('Event_%d.mp4' % (search_id),dpi=100,writer = FFwriter,fps=25) #function for saving video
  
   plt.close('all') #close the plot

  When I try to save the animation ’ani’ , I get Errno 13 (Permission denied).

   ---------------------------------------------------------------------------
  
   PermissionError                           Traceback (most recent call last)
  
   in <module>()
  
       17 
  
       18 FFwriter = animation.FFMpegWriter()
  
  ---> 19 ani.save('Event_%d.mp4' % (search_id),dpi=100,writer = FFwriter,fps=25) #function for saving video
  
   20 plt.close('all') #close the plot
  
  
  
  /home/anaconda3/lib/python3.5/site-packages/matplotlib/animation.py in save(self, filename, writer, fps, dpi, codec, bitrate, extra_args, metadata, extra_anim, savefig_kwargs)
  
      799         # since GUI widgets are gone. Either need to remove extra code to
  
      800         # allow for this non-existant use case or find a way to make it work.
  
  --> 801         with writer.saving(self._fig, filename, dpi):
  
      802             for anim in all_anim:
  
      803                 # Clear the initial frame
  
  
  
  /home/anaconda3/lib/python3.5/contextlib.py in __enter__(self)
  
       57     def __enter__(self):
  
       58         try:
  
  ---> 59             return next(self.gen)
  
       60         except StopIteration:
  
       61             raise RuntimeError("generator didn't yield") from None
  
  
  
  /home/anaconda3/lib/python3.5/site-packages/matplotlib/animation.py in saving(self, *args)
  
      192         '''
  
      193         # This particular sequence is what contextlib.contextmanager wants
  
  --> 194         self.setup(*args)
  
      195         yield
  
      196         self.finish()
  
  
  
  /home/anaconda3/lib/python3.5/site-packages/matplotlib/animation.py in setup(self, fig, outfile, dpi, *args)
  
      182         # Run here so that grab_frame() can write the data to a pipe. This
  
      183         # eliminates the need for temp files.
  
  --> 184         self._run()
  
      185 
  
      186     @contextlib.contextmanager
  
  
  
  /home/anaconda3/lib/python3.5/site-packages/matplotlib/animation.py in _run(self)
  
      210                                       stdout=output, stderr=output,
  
      211                                       stdin=subprocess.PIPE,
  
  --> 212                                       creationflags=subprocess_creation_flags)
  
      213 
  
      214     def finish(self):
  
  
  
  /home/anaconda3/lib/python3.5/subprocess.py in __init__(self, args, bufsize, executable, stdin, stdout, stderr, preexec_fn, close_fds, shell, cwd, env, universal_newlines, startupinfo, creationflags, restore_signals, start_new_session, pass_fds)
  
      948                                 c2pread, c2pwrite,
  
      949                                 errread, errwrite,
  
  --> 950                                 restore_signals, start_new_session)
  
      951         except:
  
      952             # Cleanup if the child failed starting.
  
  
  
  /home/anaconda3/lib/python3.5/subprocess.py in _execute_child(self, args, executable, preexec_fn, close_fds, pass_fds, cwd, env, startupinfo, creationflags, shell, p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite, restore_signals, start_new_session)
  
     1542                             else:
  
     1543                                 err_msg += ': ' + repr(orig_executable)
  
  -> 1544                     raise child_exception_type(errno_num, err_msg)
  
     1545                 raise child_exception_type(err_msg)
  
     1546 
  
  
  
  PermissionError: [Errno 13] Permission denied
  
  </module>

  Can someone help me ? Thanks in advance.

• Got a crash when I run a ffmpeg comand on an certain phone

  31 août 2016, par Kingty Teng

  here is the code I change from ffmpeg.c ,it can be run correct.
  BUT,IT ALWAYS crashed on an cenrtain phone after run this code.

  JNIEXPORT jstring JNICALL Java_com_p1_mobile_android_media_VideoKit_run(
  
      JNIEnv* env, jobject thiz, jobjectArray strArray)
  
  {
  
  
  
  
  
      int ret, i, pid;
  
      int pipeFD[2];
  
      char retBuffer[2];
  
      char resultString[4096];
  
  
  
      int argc = (*env)->GetArrayLength(env, strArray);
  
  
  
      char ** argv = (char **)malloc(sizeof(char*)*argc);
  
  
  
      for (i = 0; i < argc; i++) {
  
          argv[i] = (*env)->GetStringUTFChars(env,
  
                                (jstring)(*env)->GetObjectArrayElement(env, strArray, i), NULL);
  
      }
  
  
  
      // reset to FAIL
  
      ret = 1;
  
      memset(retBuffer, 0, sizeof(retBuffer));
  
      memset(resultString, 0, sizeof(resultString));
  
  
  
      pipe(pipeFD);
  
  
  
      pid = fork();
  
  
  
  
  
      if (pid < 0) {
  
          goto done;
  
      } else if (pid == 0) {
  
          // in child process, do command work
  
  
  
  
  
          close(pipeFD[0]);
  
  
  
          init();
  
  
  
          av_log_set_callback(log_callback);
  
  
  
          ret = run_ffempeg_command(argc, argv);
  
  
  
  
  
          s_task_completed = 1;
  
  
  
          sprintf(retBuffer, "%d", ret);
  
          write(pipeFD[1], retBuffer, sizeof(retBuffer));
  
  
  
          char * result_record = get_record_result();
  
          if (result_record != NULL && strlen(result_record) > 0) {
  
              sprintf(resultString, "%s", result_record);
  
          } else {
  
              if (ret == 0 && s_task_completed == 1) {
  
                  sprintf(resultString, "%s", "SUCCESS");
  
              } else {
  
                  sprintf(resultString, "%s", "FAIL");
  
              }
  
          }
  
  
  
          write(pipeFD[1], resultString, sizeof(resultString));
  
  
  
          exit(0);
  
      } else {
  
          close(pipeFD[1]);
  
  
  
          read(pipeFD[0], retBuffer, sizeof(retBuffer));
  
  
  
          ret = (retBuffer[0] == '1') ? 1 : 0;
  
          memset(resultString, 0, sizeof(resultString));
  
          read(pipeFD[0], resultString, sizeof(resultString));
  
      }
  
  
  
  done:
  
  
  
      for (i=0; iReleaseStringUTFChars(env,
  
                      (jstring)(*env)->GetObjectArrayElement(env, strArray, i), argv[i]);
  
      }
  
  
  
      free(argv);
  
  
  
      //close();
  
  
  
      if (strlen(resultString) > 0) {
  
          // workaround for UTF-8 issue
  
          jbyteArray array = (*env)->NewByteArray(env, sizeof(resultString));
  
          (*env)->SetByteArrayRegion(env, array, 0, sizeof(resultString), resultString);
  
          jstring strEncode = (*env)->NewStringUTF(env, "UTF-8");
  
          jclass cls = (*env)->FindClass(env, "java/lang/String");
  
          jmethodID ctor = (*env)->GetMethodID(env, cls, "<init>", "([BLjava/lang/String;)V");
  
  
  
          jstring object = (jstring) (*env)->NewObject(env, cls, ctor, array, strEncode);
  
  
  
          return object;
  
      } else {
  
          return (*env)->NewStringUTF(env, "FAIL");
  
      }
  
  }
  
  </init>

  here is the crash log.almost phone can run this well,only on one phone after run the jni ,any button i touched will bring this crash
  ,it’s really appreciate if anybody can help

      08-31 14:59:23.580 279-279/? D/AEE/AED: $===AEE===AEE===AEE===$
  
  08-31 14:59:23.580 279-279/? D/AEE/AED: p 0 poll events 1 revents 0
  
  08-31 14:59:23.580 279-279/? D/AEE/AED: not know revents:0
  
  08-31 14:59:23.580 279-279/? D/AEE/AED: p 1 poll events 1 revents 0
  
  08-31 14:59:23.580 279-279/? D/AEE/AED: not know revents:0
  
  08-31 14:59:23.580 279-279/? D/AEE/AED: p 2 poll events 1 revents 1
  
  08-31 14:59:23.580 279-279/? D/AEE/AED: aed_main_fork_worker: generator 0xf7017148, worker 0xffbe76d8, recv_fd 0
  
  08-31 14:59:23.580 279-279/? D/AEE/AED: p 3 poll events 1 revents 0
  
  08-31 14:59:23.580 279-279/? D/AEE/AED: not know revents:0
  
  08-31 14:59:23.580 279-279/? D/AEE/AED: p 4 poll events 1 revents 0
  
  08-31 14:59:23.580 279-279/? D/AEE/AED: not know revents:0
  
  08-31 14:59:23.580 279-279/? D/AEE/AED: p 5 poll events 0 revents 0
  
  08-31 14:59:23.580 279-279/? D/AEE/AED: not know revents:0
  
  08-31 14:59:23.580 8546-8546/? I/AEE/AED: handle_request(0)
  
  08-31 14:59:23.581 8546-8546/? I/AEE/AED: check process 29910 name:1.mobile.putong
  
  08-31 14:59:23.581 8546-8546/? I/AEE/AED: tid 29961 abort msg address is:0x83b09000, si_code is:-6 (request from 29910:10152)
  
  08-31 14:59:23.581 8546-8546/? I/AEE/AED: BOOM: pid=29910 uid=10152 gid=10152 tid=29961
  
  08-31 14:59:23.582 8546-8546/? I/AEE/AED: [OnPurpose Redunant in void preset_info(aed_report_record*, int, int)] pid: 29910, tid: 29961, name: RenderThread  >>> com.p1.mobile.putong <<<
  
  08-31 14:59:23.634 8546-8546/? I/AEE/AED: *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
  
  08-31 14:59:23.634 8546-8546/? I/AEE/AED: Build fingerprint: 'Letv/Le1s_CN/X3:5.0.2/DBXCNOP5501304201S/66:user/release-keys'
  
  08-31 14:59:23.634 8546-8546/? I/AEE/AED: Revision: '0'
  
  08-31 14:59:23.634 8546-8546/? I/AEE/AED: ABI: 'arm'
  
  08-31 14:59:23.635 8546-8546/? I/AEE/AED: pid: 29910, tid: 29961, name: RenderThread  >>> com.p1.mobile.putong <<<
  
  08-31 14:59:23.635 8546-8546/? I/AEE/AED: signal 6 (SIGABRT), code -6 (SI_TKILL), fault addr --------
  
  08-31 14:59:23.662 8546-8546/? I/AEE/AED: Abort message: 'Failed to make current on surface 0x8c8b6e40, error=EGL_BAD_NATIVE_WINDOW'
  
  08-31 14:59:23.662 8546-8546/? I/AEE/AED:     r0 00000000  r1 00007509  r2 00000006  r3 00000000
  
  08-31 14:59:23.662 8546-8546/? I/AEE/AED:     r4 863fddc8  r5 00000006  r6 0000000b  r7 0000010c
  
  08-31 14:59:23.662 8546-8546/? I/AEE/AED:     r8 675bdb6c  r9 863fdd30  sl 863fdd28  fp 675bdba8
  
  08-31 14:59:23.662 8546-8546/? I/AEE/AED:     ip 00007509  sp 863fd838  lr 4002ee43  pc 4005206c  cpsr 600f0010
  
  08-31 14:59:23.662 8546-8546/? I/AEE/AED: backtrace:
  
  08-31 14:59:23.662 8546-8546/? I/AEE/AED:     #00 pc 0003a06c  /system/lib/libc.so (tgkill+12)
  
  08-31 14:59:23.662 8546-8546/? I/AEE/AED:     #01 pc 00016e3f  /system/lib/libc.so (pthread_kill+66)
  
  08-31 14:59:23.662 8546-8546/? I/AEE/AED:     #02 pc 00017a0b  /system/lib/libc.so (raise+10)
  
  08-31 14:59:23.662 8546-8546/? I/AEE/AED:     #03 pc 00014317  /system/lib/libc.so (__libc_android_abort+34)
  
  08-31 14:59:23.662 8546-8546/? I/AEE/AED:     #04 pc 00012a4c  /system/lib/libc.so (abort+4)
  
  08-31 14:59:23.662 8546-8546/? I/AEE/AED:     #05 pc 000083c1  /system/lib/libcutils.so (__android_log_assert+88)
  
  08-31 14:59:23.662 8546-8546/? I/AEE/AED:     #06 pc 0003f07b  /system/lib/libhwui.so
  
  08-31 14:59:23.662 8546-8546/? I/AEE/AED:     #07 pc 0003d9e1  /system/lib/libhwui.so
  
  08-31 14:59:23.662 8546-8546/? I/AEE/AED:     #08 pc 0003ec23  /system/lib/libhwui.so
  
  08-31 14:59:23.662 8546-8546/? I/AEE/AED:     #09 pc 0003ed1b  /system/lib/libhwui.so
  
  08-31 14:59:23.662 8546-8546/? I/AEE/AED:     #10 pc 00040257  /system/lib/libhwui.so
  
  08-31 14:59:23.662 8546-8546/? I/AEE/AED:     #11 pc 00040eab  /system/lib/libhwui.so (android::uirenderer::renderthread::RenderThread::threadLoop()+66)
  
  08-31 14:59:23.662 8546-8546/? I/AEE/AED:     #12 pc 00010973  /system/lib/libutils.so (android::Thread::_threadLoop(void*)+110)
  
  08-31 14:59:23.662 8546-8546/? I/AEE/AED:     #13 pc 000609dd  /system/lib/libandroid_runtime.so (android::AndroidRuntime::javaThreadShell(void*)+72)
  
  08-31 14:59:23.662 8546-8546/? I/AEE/AED:     #14 pc 000165bf  /system/lib/libc.so (__pthread_start(void*)+30)
  
  08-31 14:59:23.662 8546-8546/? I/AEE/AED:     #15 pc 0001466b  /system/lib/libc.so (__start_thread+6)
  
  08-31 14:59:33.720 8546-8546/? E/AEE/AED: timed out waiting for tid=29910 to stop
  
  08-31 14:59:33.821 8546-8546/? E/AEE/AED: timed out waiting for tid=29915 to stop
  
  
  
  08-31 14:59:36.912 8546-8546/? E/AEE/AED: timed out waiting for tid=8434 to stop

• Recording a webpage stream with multiple requests using PhantomJS & ffmpeg to /dev/stdout leads to ffmpeg error

  2 septembre 2016, par Allisson Ferreira

  First of all, sorry for my english.

  I’m in a quest for days. I’ve researched everywhere and I couldn’t find an answer to my problem.

  I’m using Nodejs, Phantomjs and ffmpeg in this scenary :

  • An user enters the site, login with facebook and he can ask for a video with his name and some random photos (gathered by /me/ & sent via JSON POST) ;
  • Node receive the user data, creates a child process (PhantomJS + ffmpeg) and awaits for a response to send the video URL to the user.

  When I run a single instance of this request, everything is working fine. BUT, when two or more users make the request, only one video is sent and the others process end up in a ffmpeg stream error.

  I think the reason is that all the ffmpeg processes are using the same place (/dev/stdout). Since one process is already using it, the others enters in a "can’t access" error. But it is a assumption, I don’t know how /dev/stdout really works.

  Here are my codes. (I have removed some lines and renamed some variables for better understanding, sorry for any mistake)

  index.js :

  var generateVideo = 'phantomjs phantom.js '+videoID+' '+userID+' | ffmpeg -vcodec png -f image2pipe -r 30 -i - -pix_fmt yuv420p public/videos/'+userID+'/'+videoID+'.mp4 -y';
  
  
  
  childProcess.exec(generateVideo, function(err, stdout, stderr) {
  
      var json    = {};
  
      json.video  = '/videos/'+userID+'/'+videoID+'.mp4';
  
      res.send(json);
  
  });

  phantom.js :

  var page            = require('webpage').create();
  
  page.viewportSize   = { width: 1366, height: 768 };
  
  page.settings.resourceTimeout = 10000;
  
  
  
  var args            = require('system').args;
  
  var videoID         = args[1];
  
  var userID          = args[2];
  
  
  
  page.open('http://localhost:3000/recordvideo/'+videoID, 'post', function(status){
  
      var frame       = 0;
  
      var target_fps  = 30;
  
      var maxframes   = page.evaluate(function () {
  
                          return getTotalDurationInSeconds();
  
                      }) * target_fps;
  
  
  
      setInterval(function(){
  
          page.render('/dev/stdout', { format: "png" });
  
          if( frame >= maxframes ){
  
              phantom.exit();
  
          }
  
          frame++;
  
      }, (1000 / target_fps));
  
  });

  And the error :

  [Error: Command failed: /bin/sh -c phantomjs phantom.js XXXXXXXX XXXXXXXX | ffmpeg -vcodec png -f image2pipe -r 30 -i - -pix_fmt yuv420p public/videos/XXXXXXXX/XXXXXXXX.mp4 -y
  
  www-0 ffmpeg version N-80901-gfebc862 Copyright (c) 2000-2016 the FFmpeg developers
  
  www-0   built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  
  www-0   configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab
  
  www-0   libavutil      55. 28.100 / 55. 28.100
  
  www-0   libavcodec     57. 48.101 / 57. 48.101
  
  www-0   libavformat    57. 41.100 / 57. 41.100
  
  www-0   libavdevice    57.  0.102 / 57.  0.102
  
  www-0   libavfilter     6. 47.100 /  6. 47.100
  
  www-0   libavresample   3.  0.  0 /  3.  0.  0
  
  www-0   libswscale      4.  1.100 /  4.  1.100
  
  www-0   libswresample   2.  1.100 /  2.  1.100
  
  www-0   libpostproc    54.  0.100 / 54.  0.100
  
  www-0 [png @ 0x3d7c4a0] Invalid PNG signature 0x46726F6D20506861.
  
  www-0 [image2pipe @ 0x3d72780] decoding for stream 0 failed
  
  www-0 [image2pipe @ 0x3d72780] Could not find codec parameters for stream 0 (Video: png, none(pc)): unspecified size
  
  www-0 Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  www-0 Input #0, image2pipe, from 'pipe:':
  
  www-0   Duration: N/A, bitrate: N/A
  
  www-0     Stream #0:0: Video: png, none(pc), 30 tbr, 30 tbn, 30 tbc
  
  www-0 [buffer @ 0x3d81540] Unable to parse option value "0x0" as image size
  
  www-0 [buffer @ 0x3d81540] Unable to parse option value "-1" as pixel format
  
  www-0 [buffer @ 0x3d81540] Unable to parse option value "0x0" as image size
  
  www-0 [buffer @ 0x3d81540] Error setting option video_size to value 0x0.
  
  www-0 [graph 0 input from stream 0:0 @ 0x3d72600] Error applying options to the filter.
  
  www-0 Error opening filters!
  
  www-0 ]

  I really hope that I can find an answer here !
  And sorry if there already is an answer for this. But I researched for days.

  Thank you in advance !