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• Android JavaCV FFmpegFrameRecorder Exception Could not open video codec

  11 décembre 2014, par bakua

  I’m working on some encoding in Android and I use JavaCV FFmpegFrameRecorder for that. Thing is that sometims need to restart that process. I have a restart button and on tap I release everything and create it again.

  I do it like that :

  mVideoRecorder.stop();
  
  mVideoRecorder.release();

  And then I :

  mVideoRecorder = new FFmpegFrameRecorder(videoPath, outputResolution.getWidth(), outputResolution.getHeight(), 1);
  
  mVideoRecorder.setFormat(recorderParameters.getVideoOutputFormat());
  
  mVideoRecorder.setSampleRate(recorderParameters.getAudioSamplingRate());
  
  mVideoRecorder.setFrameRate(recorderParameters.getVideoFrameRate());
  
  mVideoRecorder.setVideoCodec(recorderParameters.getVideoCodec());
  
  mVideoRecorder.setVideoQuality(recorderParameters.getVideoQuality());
  
  mVideoRecorder.setAudioQuality(recorderParameters.getVideoQuality());
  
  mVideoRecorder.setAudioCodec(recorderParameters.getAudioCodec());
  
  mVideoRecorder.setVideoBitrate(1000000);
  
  mVideoRecorder.setAudioBitrate(64000);
  
  mVideoRecorder.start();

  But sometimes on the start() line I get this exception :

  com.googlecode.javacv.FrameRecorder$Exception: avcodec_open2() error -22: Could not open video codec.
  
  at com.googlecode.javacv.FFmpegFrameRecorder.start(FFmpegFrameRecorder.java:472)

  I am not able to exactly tell circumstances in which this happens but in most cases it is when I restart two times quickly (double tap the restart button). I am able to catch the exception, but it is useless because it forces app to exit.

  My guess is that it calls start while previous mVideoRecorder is still releasing internally - and therefore has mp4 codec locked for itself or something. But that is just my guess.

  Do you guys have any opinions please ?
  Thank you

• ImageMagick unable to open Paperclip upload

  4 décembre 2014, par Mark Boulder

  Why is ImageMagick unable to open my Paperclip upload ?

  I need to be able to run a few checks on it.

  Magick::ImageMagickError in TopicsController#create
  
  unable to open image `file.png': No such file or directory @ error/blob.c/OpenBlob/2638
  
  Extracted source (around line #18):
  
  file = Magick::ImageList.new(attachment.instance_read(:file_name)) 
  
  
  
  app/models/photo.rb:18:in `new'
  
  app/models/photo.rb:18:in `is_something?'
  
  app/models/photo.rb:3:in `block in '

  photo.rb

  class Photo < ActiveRecord::Base
  
    ATTACHMENT_STYLES = lambda do |attachment|
  
      if is_something?(attachment)
  
        ...
  
      else
  
        ...
  
      end
  
    end
  
    ATTACHMENT_PROCESSORS = lambda { |attachment| is_something?(attachment) ? [:some_processor] : [:thumbnail] }
  
  
  
    ...
  
  
  
    def self.is_animated_gif?(attachment)
  
      file = Magick::ImageList.new(attachment.instance_read(:file_name))
  
  
  
      true if file.something
  
    end
  
  end

• Recommendations for Open Source Webinar Platforms Supporting 1000+ Users [closed]

  28 janvier, par Firas Ben said

  I am looking for an open-source webinar platform capable of hosting 1000+ concurrent users. My primary requirements are :

  


  

  • Scalability to handle large audiences seamlessly.

  


  • Support for features like video streaming, screen sharing, and chat functionality.

  


  • Compatibility with modern technologies such as RTMP and HLS.

  


  • Extensibility to integrate with other tools or APIs.

  


  


  I’ve come across platforms like BigBlueButton but it cannot handle a great number of users in a session, so I’d like to know if there are other options available.