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• configure : add support for new CPUs

  18 juillet 2016, par James Almer

  configure : add support for new CPUs
  Add new -march values for Intel and AMD CPUs introduced with GCC 5 and 6, and
  
  improve SunCC flags accordingly.
  Reviewed-by : Michael Niedermayer <michael@niedermayer.cc>
  
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] configure

• How to trigger from button in UVC camera

  8 août 2016, par Buddhishan Manamperi

  I’m taking pictures from a webcam using Intel Edison. I was able to capture still images from the camera after installing uvc driver for linux and ffmpeg software. I use a script to capture.

  ./ffmpeg -s 640x640 -f video4linux2 -i /dev/video0 -vframes 1 image.jpeg;

  I want to capture the image from the button (in the web cam) press event. I used a USB analyzer in windows to analyze packets. It was found that URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER is transferring UP and DOWN when the button is pressed.

  Please Help me to implement button press triggering on Linux so that I could use it on Edison.

• ffmpeg drops the moov atom when coverting mp4 to ogg, or flv, webm

  31 janvier 2014, par user1370897

  I'm using processor qtfaststart and the gem paperclip-ffmpeg in Rails to convert an mp4 file to either ogg, webm, or flv. However, I haven't had any success converting the mp4 file to these formats for streaming purposes because the moov atom gets dropped (converting mp4 to mp4 keeps its moov atom though*).

  I did a $ qtfaststart -l on the original mp4 file and I get this :

  ftyp (24 bytes)
  
  moov (5691 bytes)
  
  free (399309 bytes)
  
  mdat (12312760 bytes)

  Which shows me that the mp4 file has an moov atom in there. The command that paperclip-ffmpeg is executing is something like this :

  $ ffmpeg -i ~/Movies/VID_20140119_134445.mp4 -acodec libvorbis -ac 2 -ab 96k -ar 44100 -s 640x360 -y ~/tmp/iguana.webm

  However, doing a qtfaststart on the new file (iguana.webm) I get the following :

  $ qtfaststart -l ~/tmp/iguana.webm 
  
  moov atom not found, is this a valid MOV/MP4 file?
  
  Traceback (most recent call last):
  
  File "/usr/local/bin/qtfaststart", line 5, in <module>
  
  pkg_resources.run_script(&#39;qtfaststart==1.8&#39;, &#39;qtfaststart&#39;)
  
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 489, in run_script
  
  self.require(requires)[0].run_script(script_name, ns)
  
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 1214, in run_script
  
  exec script_code in namespace, namespace
  
  File "/Library/Python/2.7/site-packages/qtfaststart-1.8-py2.7.egg/EGG-INFO/scripts/qtfaststart", line 17, in <module>
  
  
  
  File "build/bdist.macosx-10.9-intel/egg/qtfaststart/command.py", line 44, in run
  
  File "build/bdist.macosx-10.9-intel/egg/qtfaststart/processor.py", line 65, in get_index
  
  File "build/bdist.macosx-10.9-intel/egg/qtfaststart/processor.py", line 106, in _ensure_valid_index
  
  qtfaststart.exceptions.FastStartException
  
  </module></module>

  I've also tried adding the option -movflags faststart to the command ffmpeg but ffmpeg still keeps dropping the moov atom to the output file.

  I'm using Rails 4, paperclip-ffmpeg 1.0.1, ffmpeg 2.1.3 Built on Jan 28 2014. Any help would be greatly appreciated.