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• Adaptive nmls filters matlab python [closed]

  1er juin 2012, par user1314738

  I am interested in removing noise in audio from mike for reatime audio streaming using ffmpeg.

  As I get some background noise while I pass the recorded stream I am interested in removing this noise before I encode the stream the stream.

  There are few issues :-

  1.as i need to this in real time for audio streaming I cannot use Matlab TOOLBOX filters !
  so please suggest other audio processing platforms I can use for the purpose.
  If that is in python it would be really good.

  2.through ffmpeg I can link the alsa sound card using :-

  $ ffmpeg -i hw:0:0 -acodec............... rtp//255:130:40 and stream on rtp.

  but when I will be filtering the sound from mic before it is being used by the ffmpeg, i am bit confused about the syntax for the input to the ffmpeg encoder for rtp streaming.

  would it be fine to use some sort of pipe-lined buffer in between ?But the issue of real time stream and time sync between streaming and filtering still haunts.

  Please help me out in selecting right platform for filtering the audio stream and it's integration with ffmpeg encoder for real time streaming.

• GStreamer H264 stream to HTML5 webpage

  28 septembre 2020, par LostInTheEcho

  I have a Linux board with a camera connected to it that is recording whatever goes on to a mp4 file(s) on the SD card of the board. I'm using gstreamer which connects to the /dev/video1 source and uses H264 encoding. I run it with a command similar to this one :

  


  gst-launch-1.0 v4l2src device=/dev/video1 ! video/x-h264,width=640,height=480,framerate=30/1 ! h264parse ! rtph264pay ! udpsink host={host} port={port}


  


  The upper part works fine and records everything locally, but I'd also like to stream this video to a HTML5 webpage, which is meant to change camera options and have a live preview.

  


  I tried using HTTP via tcpsink and HLS via hlssink, but both resulted in a 8-10 second delay, which is basically unusable. The only thing that has no delay is the UDP sink. As far as I know the only way to catch the UDP stream is by having a tool like FFMPEG in the middle, that can convert the UDP stream to MJPEG for instance and serve it to the webpage.

  


  That would probably work, but the board doesn't have a very good CPU and is already at 50% utilization. Converting stream via FFMPEG would probably push it to 100%.

  


  Is there any other way to stream to a webpage without delay ?

  


• FFmpeg4 android Applying Overlay (watermark) taking too long

  13 janvier 2019, par Web Developer

  I’m using ffmpeg4 on android (Java) to apply overlay/watermark on the bottom left corner of the recorded video that is saved in the SD CARD.

  The video recording has maximum duration of 59 seconds. The problem that I’m facing is that I’m applying water through this command of ffmpeg4

  String[] complexCommand1 = new String[]"ffmpeg", "-y", "-i",
  "input.mp4", "-strict", "experimental", "-c:v", "libx264", "-preset",
  "ultrafast", "-vf", "movie=/water.png [watermark] ; [in][watermark] overlay=main_w-overlay_w-", "10:10", " [out]", "-s", "320x480", "-aspect",
  "2:3", "-r", "30", "-b:v", "500k",
  "output.mp4"  ;

  I’ve reduced the video resolution to 320x480 after the conversion and 480p to recorded video that is provided as input to this command but still the processing time is around 40 seconds.

  Can someone provide me workaround this to reduce this processing time.

  or what should I do to reduce this processing time. I’ve researched a lot on this and found some GitHub issues link and tried their solutions but none of them seemed to work for me.