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• ffmpeg SDP file for Darwin Streaming Server

  10 septembre 2012, par SP Sandhu

  I am making a streaming server to view live video feed of my webcam on my mobile device.

  I considered using ffmpeg , VLC and DSS and made the following setup that worked somewhat, though the frames were skipped :-

  video4linux2 > ffserver > VLC transcoding > DSS

  (RAW to ffserver) > (outputs to SDP link) > (SDP link to SDP file) > (SDP file to live streaming to mobile)

  Later, on testing VLC i found to be very inefficient and slow on my Netbook(Intel Atom N480) as it skips lot of frames.

  DSS can stream a SDP file from its /usr/local/movies(default).

  And at the same time, ffmpeg's ffserver module can stream live feed to SDP link(not SDP file).

  My requirement is that i need to create SDP file in DSS's /usr/local/movies directory so as to pass this DSS for streaming.

  So, how to create a sdp file from ffmpeg or how to create SDP file from SDP link (without using VLC's trans-coding).

  How to do that ?

• How do I use ffmpeg with Python by passing File Objects (instead of locations to files on disk)

  1er mai 2012, par Lyle Pratt

  I'm trying to use ffmpeg with Python's subprocess module to convert some audio files. I grab the audio files from a URL and would like to just be able to pass the Python File Objects to ffmpeg, instead of first saving them to disk. It would also be very nice if I could just get back a file stream instead of having ffmpeg save the output to a file.

  For reference, this is what I'm doing now :

  tmp = "/dev/shm"
  
  audio_wav_file = requests.get(audio_url)
  
  ##              ##                         ##
  
  ## This is what I don't want to have to do ##
  
  wavfile = open(tmp+filename, 'wrb')   
  
  wavfile.write(audio_wav_file.content)
  
  wavfile.close()
  
  ##              ##                         ##
  
  conversion = subprocess.Popen('ffmpeg -i "'+tmp+filename+'" -y "'+tmp+filename_noext+'.flac" 2>&1', shell = True, stdout = subprocess.PIPE).stdout.read()

  Does anyone know how to do this ?

  Thanks !

• AndroidBitmap_lockPixels failing with -3 code

  24 avril 2013, par user1568549

  In my jni module I copy images to bitmaps, which were previously
  passed from my java application.

  I do this using AndroidBitmap_lockPixels/AndroidBitmap_unlockPixels.
  Basically, it renders the image correctly, but there're strange
  effects : sometimes the application gets stuck, or after some time
  AndroidBitmap_lockPixels always returns -3

  (ANDROID_BITMAP_RESULT_ALLOCATION_FAILED). I guess this is because I
  update these bitmaps not from the GUI thread, isn't it ?

  If so, what would be correct way to "post" this operation to the GUI

  thread ? Is it possible in jni ?

  Thanks.