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• FFmpeg process killed when press poweroff button

  11 avril 2018, par dastan

  I am using the WritingMinds/ffmpeg-android-java library for ffmpeg. When I press the Power button of Asus T00J (4.4), the ffmpeg process is canceled. How can I prevent process to being killed ?

  process = shellCommand.run(cmd);

  The only solution I have in my mind is to recompile ffmpeg with all supported libraries in the shared library format (.so) instead of the executable binary and write JNI to access the ffmpeg main method. But it will take so much time. So, I am looking for alternative solutions.

• Create a rolling X second webcam buffer in Linux, press button saves to file

  13 août 2016, par Grant Gibson

  I’m working on a webcam installation with an ’instant replay’ feature. The concept is basically this :

  1. Webcam captures live, 24/7
  2. When user presses a key, the last (previous) 30 seconds of video saves to a file
  3. I’ll then compress that video using something like FFMPEG and upload to a remote server

  I’m fine with step 3 and beyond, but I haven’t been able to find a solution that does the equivalent of a FIFO buffer for video streams [i.e. pretty much what the ’rewind live tv’ buffer on TiVo does].

  Does anyone know of a way to keep a rolling webcam video/audio buffer that can be exported to a file ?

  Design considerations :

  • I’m planning to use a standard webcam, but open to other suggestions
  • Recording would ideally be 1080p, 30fps
  • Recording must include sound
  • Linux hardware and OS can be specified in the answer, there are no existing pre-requisites. Raspberry Pi would be nice if that’s possible, but equally fine with a small Intel machine (e.g. NUC).
  • There’s no requirement to save the 24/7 stream, but it’s ok if that’s a by-product. So, storage permitting it can be saving to a file continuously for say 12 hours and just ’cat’ the last 30 secs to a separate file, if that’s an option ? But better would be the 30 sec rolling FIFO buffer that could potentially do the whole job in RAM.
  • The ’save instant replay’ button will eventually be a physical pushbutton rather than a keyboard key. However, I’ve got that side of things covered (if the solution is RPi I’d use the GPIO pins, if it’s an Intel box I’d probably use an Arduino in HID mode to simulate a keyboard press).

• Convert factory-class and factory-method to factory in Services.xml

  19 janvier 2016, par K Ф

  I’m using Symfony3 and I noticed that factory-class and factory-method don’t exist anymore, but factory does exist.

  This is rather frustrating because I would like to use pulse00/ffmpeg-bundle, but the services.xml seems to be pre-3.0.

  

  As you can see the 4 red marked attributes are the problem :

  factory-class="%dubture_ffmpeg.ffmpeg.class%" factory-method="create"
  
  factory-class="%dubture_ffmpeg.ffprobe.class%" factory-method="create"

  Example(Symfony3 version) :

  services:
  
      newsletter_manager:
  
          class:   NewsletterManager
  
          factory: [NewsletterManagerFactory, createNewsletterManager]

  Question :

  How do I update the services.xml for it to work correctly with Symfony3 ?

  What I have tried :

  I have tried combining the two without much success and using factory instead. But apparantly "factory" is not allowed either.

  Errors :

  $ php bin/console server:run 

  The error I am getting :

  The attribute ’factory-class’ is not allowed.