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• Using Xuggler to detect Webcam with Java

  18 octobre 2012, par Oneiros

  I'm trying to use Xuggler library to handle webcam video stream in Java.

  My project contains these files :
  

  • Xuggler Jar (xuggle-xuggler-5.4.jar)
  • SLF4J Jars (required by Xuggler and downloadable here) :
    • jcl-over-slf4j-1.6.4.jar
    • jul-to-slf4j-1.6.4.jar
    • log4j-over-slf4j-1.6.4.jar
    • slf4j-api-1.6.4.jar
    • slf4j-ext-1.6.4.jar
    • slf4j-migrator-1.6.4.jar
    • slf4j-simple-1.6.4.jar
  • DisplayWebcamVideo.java as main class

  I run the main method using "vfwcap" and "0" as arguments.
  Application starts correctly, i can see myself from the webcam but it's just the first frame : the stream freezes and i see this output :

  5022 [Thread-3] ERROR org.ffmpeg - [vfwcap @ 000000000039A320] real-time buffer 75% full! frame dropped!

  5622 [Thread-3] ERROR org.ffmpeg - [vfwcap @ 000000000039A320] real-time buffer 85% full! frame dropped!

  6522 [Thread-3] ERROR org.ffmpeg - [vfwcap @ 000000000039A320] real-time buffer 95% full! frame dropped!

  6822 [Thread-3] ERROR org.ffmpeg - [vfwcap @ 000000000039A320] real-time buffer 101% full! frame dropped!

  6822 [Thread-3] ERROR org.ffmpeg - [vfwcap @ 000000000039A320] real-time buffer 101% full! frame dropped!

  What's the problem here ? :(

• FFmpeg causing AttributeError : __enter__ on Win10

  11 juillet 2020, par Marci

  I have a python code which runs perfectly on win7, but i struggle for hours now making it work on my win10 laptop.

  


  Before manually installing FFmpeg i receive the error

  


      "assert _HAS_FFMPEG, "Cannot find installation of real FFmpeg (which comes with ffprobe)."
AssertionError: Cannot find installation of real FFmpeg (which comes with ffprobe)"


  


  so i downloaded, unzipped FFmpeg and set up the PATH. From now on i always receive the following error :

  


  with FFmpegReader(str(sourcepath)) as src:
AttributeError: __enter__


  


  I red that this error has something to do with the open() function. But the code works fine on my other computer ?!

  


  I would highly appreciate any hints. i am rather new to this field. Sorry if that is a senseless question.

  


• Streaming .264 file while it is being encoded

  1er décembre 2017, par 123435258

  I have been digging around on the internet for a solution of my problem but I still haven’t found any solution yet.

  Let me describe my trouble.

  I have an IP camera that is connected to the another system. The system has a UDP output and transmits every data that is taken from the camera at each 20ms in real-time.

  I have written a Python code that takes the camera data from socket and turns it to a .264 video file while it is being encoded. To display it ;

  I first create a rtp server for streaming and open the URL address in VLC and wait for the second command.

  ffmpeg -i rtp://127.0.0.1:1234 -c copy -f flv rtp://127.0.0.1:1234/PSIA/Streaming/channels/2?videoCodecType=H.264

  Then I give this second command as soon as I run my Python code.

  ffmpeg -re -i C:\Python27\myVideo.264 -c copy -f rtp_mpegts rtp://127.0.0.1:1234 -c copy -f flv 

  What I would like to do is to display the video at real-time with 3 seconds delay forever. However, as mentioned above, the system gives the data at every each 20ms and ffmpeg can’t find the key frames to play the video at real-time at such a speed. I can display the video for 30 seconds with 5 seconds delay, then video turns into images in every 1s which is not a continuous video and which is not I want.

  Any help would be appreciated. Thanks in advance !