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• How to extract attachment from mkv file with ffmpeg (dump_attachment command not working)

  31 octobre 2015, par Anna K.

  This is the command that I’m running through nwjs :

  ffmpeg -dump_attachment:t:4 C:\nw\files/test.jpg -i E:\video/test.mkv

  From their docs here http://ffmpeg.org/ffmpeg.html#Main-options looks like it’s right

  But I get the error "At least one output file must be specified". I don’t understand why because It’s clearly specified in the command :(

  Any help please ?

  I tried running the same command in the Windows command line and the same error appears...

  ---

  I found out that this command :

  ffmpeg -i E:\video/test.mkv -map 0:4 -c copy C:\nw\files/test.jpg

  does extract the attachment, but the ffmpeg process does not close !

  If I run the same command in the Windows shell it prints to the screen "press [q] to quit" or something, which doesn’t work because I have to press ctrl+c twice to quit, and then I get some error about reading from the mkv. But when I look in the files directory I see the attachment there

• tools/python : add script to convert TensorFlow model (.pb) to native model (.model)

  13 juin 2019, par Guo, Yejun

  tools/python : add script to convert TensorFlow model (.pb) to native model (.model)
  For example, given TensorFlow model file espcn.pb,
  
  to generate native model file espcn.model, just run :
  
  python convert.py espcn.pb
  In current implementation, the native model file is generated for
  
  specific dnn network with hard-code python scripts maintained out of ffmpeg.
  
  For example, srcnn network used by vf_sr is generated with
  
  https://github.com/HighVoltageRocknRoll/sr/blob/master/generate_header_and_model.py#L85
  In this patch, the script is designed as a general solution which
  
  converts general TensorFlow model .pb file into .model file. The script
  
  now has some tricky to be compatible with current implemention, will
  
  be refined step by step.
  The script is also added into ffmpeg source tree. It is expected there
  
  will be many more patches and community needs the ownership of it.
  Another technical direction is to do the conversion in c/c++ code within
  
  ffmpeg source tree. While .pb file is organized with protocol buffers,
  
  it is not easy to do such work with tiny c/c++ code, see more discussion
  
  at http://ffmpeg.org/pipermail/ffmpeg-devel/2019-May/244496.html. So,
  
  choose the python script.
  Signed-off-by : Guo, Yejun <yejun.guo@intel.com>
  

  • [DH] .gitignore
  • [DH] tools/python/convert.py
  • [DH] tools/python/convert_from_tensorflow.py

• Use ffmpeg to assess media quality recursively and output to a file

  6 septembre 2021, par JD71

  Would anyone mind telling me how to use ffmpeg recursively to scan my collection, assess the video quality and export all of the output data to a file ? I've searched quite a bit on the web and there have been some close to what I'm looking for but not exactly. If I should be using something else, I'm open to suggestions as well.

  


  Thank you in advance for any assistance you can provide !

  


  J