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• ffplay playback h264 encoded camera preview blur

  11 juillet 2019, par doufu

  I use the ffplay tool provided by ffmpeg to play an h264 encoded camera. When the camera is still, the interface will be very clear, but when I cover the camera for a while to remove the occlusion or move the camera quickly, the interface will be blurred, resulting in a mosaic-like picture, but the interface will become clear after a few seconds.
  Why is this happening ?
  Am I missing some options to run ffplay ?
  PS：Using AMCap will not have the above problem.
  The command opening my camera I used :

  ffplay.exe -f dshow -i video="camera name"

  Preview screencast video is uploaded to youtube

  The following is the printout information of ffplay：
  

• Revision ce08006951 : Always check and free denoiser buffer memory space The vp9_denoiser_free() func

  7 janvier 2015, par Jingning Han

  Changed Paths :
   Modify /vp9/encoder/vp9_encoder.c

  
  
  Always check and free denoiser buffer memory space

  The vp9_denoiser_free() function will internally check if the
  buffer pointers are NULL. This commit makes the encoder always
  call vp9_denoiser_free() after finishing encoding. It protects the
  case where noise_sensitivity_level is changed during encoding
  process and happen to be turned off towards the end of sequence,
  which could result memory space allocated to denoiser not being
  released.

  Change-Id : Ie20dc2f2e6e5fb6333fbab3356bc153978a6a0f8

• Processing3 get "Error=2 No such file or directory" with a file that actually doesn't exist at the first place

  29 octobre 2016, par Tuang Pingfavilunda

  I cannot figure it out what happen to my Processing file. I am trying to use VideoExport library and my Macbook Pro cannot play it, but the Mac-mini is able to do so.

  Before the error happened it is another error=13 permission denied thing, so I messed in the terminal for a while with chmod 777 and finding the file with ls. I don’t know if that may be the reason that caused this happen. FYI, I also installed ffmpeg already.

  And this is the full error :

      java.io.IOException: Cannot run program "/Users/Tuang/Desktop/DMA_WORKS/Work1_Facial Muscles/Cam_Rec/sketch_161027a/sketch_161027a.pde": error=2, No such file or directory
  
      at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
  
      at com.hamoid.VideoExport.startFfmpeg(Unknown Source)
  
      at com.hamoid.VideoExport.initialize(Unknown Source)
  
      at com.hamoid.VideoExport.saveFrame(Unknown Source)
  
      at Basic.draw(Basic.java:32)
  
      at processing.core.PApplet.handleDraw(PApplet.java:2412)
  
      at processing.awt.PSurfaceAWT$12.callDraw(PSurfaceAWT.java:1540)
  
      at processing.core.PSurfaceNone$AnimationThread.run(PSurfaceNone.java:316)
  
  Caused by: java.io.IOException: error=2, No such file or directory
  
      at java.lang.UNIXProcess.forkAndExec(Native Method)
  
      at java.lang.UNIXProcess.<init>(UNIXProcess.java:247)
  
      at java.lang.ProcessImpl.start(ProcessImpl.java:134)
  
      at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
  
      ... 7 more
  
  VideoExport error: Ffmpeg failed. Study /Users/Tuang/Desktop/DMA_WORKS/Work1_Facial_Muscles/Camera_Recorder/Basic/basic.mp4.txt for more details.
  
  Could not run the sketch (Target VM failed to initialize).
  
  For more information, read revisions.txt and Help → Troubleshooting.
  
  </init>

  ---

  1) The java.io.IOException : trying to call "/Work1_Facial Muscles/Cam_Rec/sketch_161027a/sketch_161027a.pde" which doesn’t exist for real. It is gone for a long time but seems like the program stuck here.

  2) "basic" is a file name from the Example of the Library. I just use it to test. Surprisingly, Every files that have been saved and changed the name still get the java.io.IOException’s error of the missing sketch_161027a.pde file.

  ---

  What I have done :
  1 I have already done the Homebrew thing to install ffmpeg.
  2 I deleted everything of Processing and reinstall it again.

  Any suggestion ?