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• Speed up a video without audio to 2x with FFmpeg in android

  12 décembre 2020, par VoidMain

  I am working on a project in which I need to speed up a mute video. I did a little digging around and found the following command.

  



  ffmpeg -i input.mkv -filter:v "setpts=PTS/2" output.mkv 


  



  Tried to use it in android as follows.

  



  new String[]{"-y", "-i", inputFileAbsolutePath, "-filter_complex", "setpts=PTS/2", "-map", "[v]", "-map", "[a]", "-b:v", "2097k", "-r", "60", "-vcodec", "mpeg4", fileOutput};


  



  It doesn't even show anything in the Logcat.

  



  I have also tried a few other solutions but no luck.
Any help would be appreciated.
Thanks.

  


• AppRTC : Google’s WebRTC test app and its parameters

  23 juillet 2014, par silvia

  If you’ve been interested in WebRTC and haven’t lived under a rock, you will know about Google’s open source testing application for WebRTC : AppRTC.

  When you go to the site, a new video conferencing room is automatically created for you and you can share the provided URL with somebody else and thus connect (make sure you’re using Google Chrome, Opera or Mozilla Firefox).

  We’ve been using this application forever to check whether any issues with our own WebRTC applications are due to network connectivity issues, firewall issues, or browser bugs, in which case AppRTC breaks down, too. Otherwise we’re pretty sure to have to dig deeper into our own code.

  Now, AppRTC creates a pretty poor quality video conference, because the browsers use a 640×480 resolution by default. However, there are many query parameters that can be added to the AppRTC URL through which the connection can be manipulated.

  Here are my favourite parameters :
  

  • hd=true : turns on high definition, ie. minWidth=1280,minHeight=720
  • stereo=true : turns on stereo audio
  • debug=loopback : connect to yourself (great to check your own firewalls)
  • tt=60 : by default, the channel is closed after 30min – this gives you 60 (max 1440)

  For example, here’s how a stereo, HD loopback test would look like : https://apprtc.appspot.com/?r=82313387&hd=true&stereo=true&debug=loopback .

  This is not the limit of the available parameter, though. Here are some others that you may find interesting for some more in-depth geekery :

  • ss=[stunserver] : in case you want to test a different STUN server to the default Google ones
  • ts=[turnserver] : in case you want to test a different TURN server to the default Google ones
  • tp=[password] : password for the TURN server
  • audio=true&video=false : audio-only call
  • audio=false : video-only call
  • audio=googEchoCancellation=false,googAutoGainControl=true : disable echo cancellation and enable gain control
  • audio=googNoiseReduction=true : enable noise reduction (more Google-specific parameters)
  • asc=ISAC/16000 : preferred audio send codec is ISAC at 16kHz (use on Android)
  • arc=opus/48000 : preferred audio receive codec is opus at 48kHz
  • dtls=false : disable datagram transport layer security
  • dscp=true : enable DSCP
  • ipv6=true : enable IPv6

  AppRTC’s source code is available here. And here is the file with the parameters (in case you want to check if they have changed).

  Have fun playing with the main and always up-to-date WebRTC application : AppRTC.

  UPDATE 12 May 2014

  AppRTC now also supports the following bitrate controls :

  • arbr=[bitrate] : set audio receive bitrate
  • asbr=[bitrate] : set audio send bitrate
  • vsbr=[bitrate] : set video receive bitrate
  • vrbr=[bitrate] : set video send bitrate

  Example usage : https://apprtc.appspot.com/?r=&asbr=128&vsbr=4096&hd=true

  The post AppRTC : Google’s WebRTC test app and its parameters first appeared on ginger’s thoughts.

• How to install ffmpeg on Google App Engine ?

  3 mai 2020, par UtkuBulkan

  I intend to install ffmpeg and ffprobe to my Google App Engine flex environment, how can I do this with requirements.txt as a package ?

  



  I am currently using ffmpeg-python yet, this is only a wrapper.

  



  ffmpeg-python==0.2.0
ffprobe-python==1.0.3


  



  Below is the error when I try to use ffmpeg-python wrapper, which is expected as there is no ffmpeg and ffprobe available :

  



  2020-05-03 11:42:36 default[20200503t112932]  [03/May/2020 11:42:36] ERROR    [log.py:228] Internal Server Error: /capture_thumbnail/
2020-05-03 11:42:36 default[20200503t112932]  Traceback (most recent call last):    File "/env/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner      response = get_response(request)    File "/env/lib/python3.6/site-packages/django/core/handlers/base.py", line 115, in _get_response      response = self.process_exception_by_middleware(e, request)    File "/env/lib/python3.6/site-packages/django/core/handlers/base.py", line 113, in _get_response      response = wrapped_callback(request, *callback_args, **callback_kwargs)    File "/home/vmagent/app/core/views.py", line 62, in capture_thumbnail      generate_thumbnail(request, blob_uuid)    File "/home/vmagent/app/core/videointelligence1.py", line 264, in generate_thumbnail      probe = ffmpeg.probe(video_url)    File "/env/lib/python3.6/site-packages/ffmpeg/_probe.py", line 20, in probe      p = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE)    File "/opt/python3.6/lib/python3.6/subprocess.py", line 729, in __init__      restore_signals, start_new_session)    File "/opt/python3.6/lib/python3.6/subprocess.py", line 1364, in _execute_child      raise child_exception_type(errno_num, err_msg, err_filename)  FileNotFoundError: [Errno 2] No such file or directory: 'ffprobe': 'ffprobe'


  



  Can you please suggest a way, so I can use ffprobe on Google App Engine.