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• Capturing frames from an h264 stream with gst/ffmpeg

  13 août 2021, par Yuval.Sightec

  I want to save (as jpegs) or reach the data of the frames streaming from my usb camera.
Meaning that I want to use the h.264 hardware encoding (I running it on nvdia jetson) in order to get a sequence of compressed files (I prefer not save it on the disc and get an array, if possible).
Can I do that ?

  



  So far I tried this :

  



  gst-launch-1.0 -v v4l2src device=/dev/video0 ! video/x-h264,framerate=30/1,stream-format=byte-stream ! decodebin ! videorate ! video/x-raw,framerate=30/1 ! videoconvert ! jpegenc ! multifilesink location=img_%04d.jpg


  



  but I get an internal data flow error from v4l2src0 element, and an error from gst_base_src_loop() after the pipeline was set to PLAYING.

  



  Can anybody please help me ?

  



  b.t.w- It doesnt have to be neccecerly h.264 encoding, it also can be mpeg encoding or something else : I want to use the fact that it is pictures of a video, frames, in order to get smaller size frames.

  



  Thank you so much !

  


• Capturing frames from an h264 stream with gst/ffmpeg

  17 août 2016, par Yuval.Sightec

  I want to save (as jpegs) or reach the data of the frames streaming from my usb camera.
  Meaning that I want to use the h.264 hardware encoding (I running it on nvdia jetson) in order to get a sequence of compressed files (I prefer not save it on the disc and get an array, if possible).
  Can I do that ?

  So far I tried this :

  gst-launch-1.0 -v v4l2src device=/dev/video0 ! video/x-h264,framerate=30/1,stream-format=byte-stream ! decodebin ! videorate ! video/x-raw,framerate=30/1 ! videoconvert ! jpegenc ! multifilesink location=img_%04d.jpg

  but I get an internal data flow error from v4l2src0 element, and an error from gst_base_src_loop() after the pipeline was set to PLAYING.

  Can anybody please help me ?

  b.t.w- It doesnt have to be neccecerly h.264 encoding, it also can be mpeg encoding or something else : I want to use the fact that it is pictures of a video, frames, in order to get smaller size frames.

  Thank you so much !

• Revision 6e5e75fa21 : Revert "Removing redundant variables from variance_test.cc." This reverts commi

  8 mai 2014, par James Zern

  Changed Paths :
   Modify /test/variance_test.cc

  
  
  Revert "Removing redundant variables from variance_test.cc."

  This reverts commit 4725ab7e51a69bf890856e524c6d78aadd97d64e.

  The constants are necessary to avoid breakage in vs9 builds :
  warning C4180 : qualifier applied to function type has no meaning ; ignored
  error C2436 : ’f2_’ : member function or nested class in constructor initializer
  list
  while compiling class template member function
  ’std::tr1::tuple::tuple(const int &,const int
  &,unsigned int (__cdecl &))’
  ..\test\variance_test.cc : see reference to class template instantiation
  ’std::tr1::tuple’ being compiled

  Change-Id : Ia218b74fc473d40f02fee84cb7009adfbe82e5a7