Recherche avancée

Sur d’autres sites (11816)

• Android MediaMetadataRetriever.METADATA_KEY_DATE gives only date of video on galaxy S7

  15 mai 2023, par Zaid Bin Tariq

  I am writing a code to get video creation date and time from metadata, i am using following code to get creation date

  



  MediaMetadataRetriever retriever = new MediaMetadataRetriever();
retriever.setDataSource(path_to_video);
String date = retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DATE);


  



  it works perfect on all devices except Samsung Galaxy S7, it returns only date in "YYYY MM DD" format, no time stamp i need both date and timestamp.

  



  any help in this regard is much appreciated.

  


• FFMPEG : is there a way to keep RTSP connection alive in code ?

  14 décembre 2011, par Alex

  I'm taking frames from a RTSP connection as follows (in pseudocode) :

  av_open_input_file(&avcontext)
  
  while(av_read_frame(&frame) > 0) {
  
      doSomething(frame);
  
      av_free_packet(frame);
  
  }

  For some reason the doSomething() function takes much time and, because of this (at least, I think so) the connection interupts - av_read_frame() returns 'eof' and the loop exits.

  When I make doSomething() shorter such interruptions do not occur.

  For some reasons I can't do doSomething() in another thread.

  Therefore, I'm interested if maybe there are some parameters to avcontext which will let me keep the connection alive or increase the timeout ?

  Thank you !

• 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).