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• How to grap voice and vedio in ffmpeg \ mplayer\mencoder ?

  4 février 2013, par Kill Kill

  My target is to grap voice and vedio via webcamera,there are three ways to do :

  1.ffmpeg -f oss -i /dev/dsp -f video4linux2 -r 25 -b 500000 -s 320x240 -i /dev/video0 out.mpg
  WARNING : gnome-keyring: : couldn't connect to : /home/debian/.cache/keyring-4Hzs4r/pkcs11 : No such file or directory
  ffmpeg version 0.8.5-6:0.8.5-1, Copyright (c) 2000-2012 the Libav developers
  built on Jan 13 2013 16:02:15 with gcc 4.7.2
  * THIS PROGRAM IS DEPRECATED *
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  [oss @ 0x9d63c60] /dev/dsp : No such file or directory
  /dev/dsp : Input/output error

  in my computer how to revise it ?

  2.mplayer tv :// -tv driver=v4l2:input=0:width=640:height=480:fps=25 -vo x11
  i can see the veido when the command run ,how can l save the output into a file and grap the voice ?

  3.mencoder tv :// -tv driver=v4l2:width=800:height=600:device=/dev/video0:fps=30:outfmt=yuy2:forceaudio:alsa:adevice=hw.2,0 -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=1800 -ffourcc xvid -oac mp3lame -lameopts cbr=128 -o output.avi

  MEncoder svn r34540 (Debian), built with gcc-4.7 (C) 2000-2012 MPlayer Team
  success : format : 9 data : 0x0 - 0x0
  TV file format detected.
  Selected driver : v4l2
  name : Video 4 Linux 2 input
  author : Martin Olschewski
  comment : first try, more to come
  v4l2 : your device driver does not support VIDIOC_G_STD ioctl, VIDIOC_G_PARM was used instead.
  Selected device : PC Camera
  Capabilities : video capture read/write streaming
  supported norms :
  inputs : 0 = zc3xx ;
  Current input : 0
  Current format : unknown (0x4745504a)
  tv.c : norm_from_string(pal) : Bogus norm parameter, setting default.
  v4l2 : ioctl enum norm failed : Inappropriate ioctl for device
  Error : Cannot set norm !
  Selected input hasn't got a tuner !
  ALSA lib pcm_hw.c:1401 :(_snd_pcm_hw_open) Invalid value for card
  Error opening audio : No such file or directory
  ALSA lib pcm_hw.c:1401 :(_snd_pcm_hw_open) Invalid value for card
  Error opening audio : No such file or directory
  ALSA lib pcm_hw.c:1401 :(_snd_pcm_hw_open) Invalid value for card
  Error opening audio : No such file or directory
  v4l2 : ioctl set mute failed : Invalid argument
  v4l2 : 0 frames successfully processed, 0 frames dropped.
  ============ Sorry, this file format is not recognized/supported =============
  === If this file is an AVI, ASF or MPEG stream, please contact the author ! ===
  Cannot open demuxer.

  Exiting...

• how to allow a worker to run a ffmpeg command on heroku for my python/django app ?

  10 mars 2013, par GetItDone

  I've been stuck trying to figure this out for weeks. I previously asked a similar question found here but I never got any replies. I really cannot find any good documentation anywhere. All I need to do is use a worker (don't care what worker have django-celery and rq installed) to convert a file to flv when it is uploaded from a form. I was able to get this done easily locally, but after over a week I haven't been able to get it to work no matter what I have tried. I tried adding a tasks.py file for celery, or a worker.py file for rq, and I have no idea what else (if anything) needs to be done, such as in my settings.py or Procfile. My procfile looks like :

  web: gunicorn lftv.wsgi -b 0.0.0.0:$PORT
  
  celeryd: celery -A tasks worker --loglevel=info
  
  worker: python worker.py

  My requirements.txt showing what I have installed looks like this :

  Django==1.4.3
  
  Logbook==0.4.1
  
  amqp==1.0.6
  
  anyjson==0.3.3
  
  billiard==2.7.3.19
  
  boto==2.6.0
  
  celery==3.0.13
  
  celery-with-redis==3.0
  
  distribute==0.6.31
  
  dj-database-url==0.2.1
  
  django-celery==3.0.11
  
  django-s3-folder-storage==0.1
  
  django-storages==1.1.6
  
  gunicorn==0.16.1
  
  kombu==2.5.4
  
  pil==1.1.7
  
  psycopg2==2.4.5
  
  python-dateutil==1.5
  
  pytz==2012j
  
  redis==2.7.2
  
  requests==1.1.0
  
  rq==0.3.2
  
  six==1.2.0
  
  times==0.6

  The only thing relevant in my settings.py are as follows :

  BROKER_BACKEND = 'django'
  
  BROKER_URL = #For this I copy/pasted the code from my redistogo add-on from heroku. Not sure if correct
  
  BROKER_TRANSPORT_OPTIONS = {'visibility_timeout': 1800}

  Without trying to take up too much more space, my tasks.py looks like this :

  import subprocess
  
  
  
  @task
  
  def ffmpeg_conversion(input_file):
  
      converted_file = subprocess.call(input_file)
  
      return converted_file

  I use S3 to store my static and media files, and the upload works (adding uploads to my bucket), however no matter what I try the conversion never will. Is there a good tutorial for absolute beginners ? I followed the heroku redis tutorial, celery docs, rq docs, and whatever else I can find, and got the examples to work, but the worker will not execute the command from my view. For example one of the many things I tried :

  ...
  
  ffmpeg = "ffmpeg -i %s -acodec mp3 -ar 22050 -f flv -s 320x240 %s" % (sourcefile, targetfile)
  
  ffmpegresult = ffmpeg_conversion.delay(ffmpeg)
  
  ...

  or using rq

  ...
  
  q = Queue(connection=conn)
  
  result = q.enqueue(ffmpeg_conversion, ffmpeg)
  
  ...

  I seems like it should be simple, however I am completely self-taught and have never deployed a project whatsoever, and there just doesn't seem to be any good documentation or tutorial available for what I am trying to do. I can't judge whether I am completely off and completely missing something significant or relatively close to getting this to work. I really do appreciate any input whatsoever, this is driving me nuts. Thanks in advance.

• How to convert audio stream from PureTool/CVS video ?

  1er janvier 2013, par Mark

  I apologize if there is a better place to post this. I recently came across a couple CVS single-use video cameras that I had been using back in 2005. I still have the USB cable I made and now that I've switched to Mac I can use Puretool to extract the old videos from the cameras. The problem I'm having is that I can only hear the audio when viewing the videos with VLC media player. I read on PureTools site, a common problem is that the audio codec used is incompatible with Quicktime and the audio stream needs to be converted. There is a link on their site to a program called FixSound which is purported to fix this, but the link is dead and I've been unable to find any further information about this. If anyone could point me in the right direction, I'd be very grateful. All the videos I'm dealing with are from the first year of my son's life and I'd really like to be able to archive them in a more uniform format. I would think this would be possible to do using Adobe Audition or some other program in Adobe's CS6 Master Collection but I've only dealt with Photoshop, Illustrator, Dreamweaver, Flash & Fireworks. I have no experience with audio or video yet.

  Thanks,

  Mark