Recherche avancée

Sur d’autres sites (8928)

• Create VHS Hi-Fi type (20Hz-20kHz) WAV file, from a 48kHz source FFmpeg [closed]

  27 août 2023, par Taymur Roshan

  I've been experimenting with using FFmpeg to convert modern high-quality audio (44.1, 48 & 96kHz etc.)into analogue type audio which are the old fashions Hi-Fi sounds like the 20 kHz frequency sampling signals https://en.wikipedia.org/wiki/VHS#Hi-Fi_audio_system.

  


  But since I already figured out of how to simply convert high frequency (source 48kHz) to low frequently (output 20kHz) using the '-ar' filter :

  


  ffmpeg -i "source.webm" -c:a pcm_s16le -ar 20000 "output.wav"


  


  However what I would like to know is that how can I make a genuine "flat full-range frequency response" 20 Hz to 20 kHz ?

  


  That would mean first downmix to 20kHz and also remove the first 20Hz out of the audio.

  


• Stream and control a playlist to RTMP

  20 décembre 2016, par Eight

  I’m currently trying to stream a playlist of files from ffmpeg to an RTMP server.
  I’ve managed to get a single file to be streamed correctly, and (I think) a playlist by using :

  "concat:file1.pm4|file2.mp4|file3.mp4"

  I then tried to use the concatenation method from a txt file they explain here :
  https://trac.ffmpeg.org/wiki/Concatenate

  And was able to get it to work. However I seem to have some problems with controlling it. For example, I have no idea if it is possible to tell ffmpeg to skip this file and play the next one in the list, or to pause the stream at all. I already tested editing the txt file while it is streaming, but that didn’t seem to affect what was already streaming at all.

  Any idea how I can control my stream from the console ? My end goal would be to make the control into a full web interface later, but I’m not even sure if ffmpeg is my best option to do this.

  Any help with ffmpeg or any other options to do this would be greatly appreciated.

• Implementing hardware accelerated decoding on windows with FFMPEG

  24 juillet 2019, par sacha legrand

  Intel processor incorporates hardware acceleration capabilities for video encoding / decoding.

  I use :

  Intel 5 series HD graphics & Processeur Intel Core i7-620UE

  and/or

  Intel Gen9 HD Graphics Engine & Processor Intel Core i7-6600U

  So wich hardware acceleration should I use (H264, VC1, H265, etc.) to be more efficient ?

  The FFMPEG library provides everything you need to perform decoding.

  We accessed these hardware acceleration features by default ?

  Should I use a specific API or library ?

  I finnally find in
  https://trac.ffmpeg.org/wiki/HWAccelIntro
  It is Libmfx how seems the best for my case (Windows & Intel)

  Am I on the right way ?

  I should explaine all the possibility so if you have any other doc about that it’s could be cool.

  Thank you