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• How do I get the output from an ASIO device to IceCast2 or FFMpeg ?

  13 novembre 2015, par Saneet

  I have an ASIO device (Presonus Firestudio 2626). I am using it to mix and create different outputs on all of it’s provided outputs (about 9 outputs like ADT1, ADT2). I need someway to stream these outputs using either IceCast or FFMpeg RTP.

  One of the problems is that I have a restriction on using only a MAC or a Windows machine as my ASIO device does not provide drivers for ubuntu.

  What are the ways that I can connect the ASIO device outputs to IceCast or FFMpeg ?

  I’ve tried the following.

  Windows :
  Jack - LiquidSoap - IceCast
  Problem is that LiquidSoap on windows does not work with Jack.
  Virtual Audio Cable - Butt - IceCast
  Virtual Audio Cable was very inefficient. More than 2 streams and it crashes.

  Mac :
  Jack - DarkIce - IceCast
  Jack doesn’t work on Mac versions above Snow Leopard.

  Can someone help me with which tools I should use and how I can do this ?
  I’m a complete novice on this so please provide some details.

• Is it possible to capture audio from an ASIO device with ffmpeg ?

  26 mai 2016, par Amfasis

  We have a setup with a Windows 7 machine where we installed Dante Virtual Soundcard and start that soundcard with ASIO capabilities. The soundcard will receive audio over the network from a Tesira server. We want to capture the audio to files (highly preferring each channel to a separate file). The files will be played back on a later moment. There will likely be 6 channels or more.

  In the same setup we use ffmpeg to capture some video which is working fine, with Direct Show. So for audio we wanted to use the same setup, since ffmpeg is able to record audio as well. However, there seems to be no option to select the ASIO devices which the virtual soundcard probably creates. So the question is what command line to use for ffmpeg, or what to install ? Or which other program can record ASIO from command line ?

  I already tried installing :

  • Asio4all (actually wrong way around)
  • sox (don’t know why actually)
  • HiFi Cable Asio Bridge (from VB-audio, not enough channels even with donate version)
  • Voicemeeter (from VB-Audio, not enough channels and actually mixes down)
  • O Deus Asio link, this might be an interesting option but it did not let me configure any route, any suggestions ?

  One thing I noticed is that the virtual soundcard can also be set to use WDM. Then I can see the devices with ffmpeg -list_devices true -f dshow -i duymmy, but recording does not yield any result, I have to ctrl-c to make it stop instead of q, and the file is zero bytes. Supposedly this is because the data over the network is all ASIO formatted and the Tesira Server cannot send "WDM data". FFmpeg stops at selecting the capture pin for audio only

  EDIT :

  I ran ffmpeg with high verbosity and when selecting the WDM soundcard it stops at Selecting pin Capture on audio only. Also when requesting the options it gives the same line for 22 times : min ch=1 bits=8 rate= 11025 max ch=2 bits=16 rate= 44100

• fixing (with ffmpeg) the chrominance position on a video after capturing

  23 mai 2016, par APLU

  I’m trying to convert some video from VHS to digital using an (old) video capture card (and obviously an old VHS player). Due to the input from my video capture card and the output available from the VHS, I have no other choice than capture with an S-Video cable to a computer.

  Almost everything works except a little mis-synchronization between chroma and luma which do not happen on TV.

  For example, in the original video, I have something like that :
  

  After capturing the video looks like this :
  

  As you may see, there is a little desynchronization of the chroma with the luma channel (I will say about 10 lines errors).

  I’m capturing with ffmpeg on a Linux system with the following commands :

  $ v4lctl setnorm PAL-BG

  $ v4lctl setinput S-video

  $ ffmpeg -y -f alsa -ac 2 -i pulse -f video4linux2 -i /dev/video0 -c:a pcm_s16le -vcodec rawvideo -t $duration -r 25 -loglevel error -stats /tmp/tmp.mkv

  I tried other input norm in v4l, tried an other VHS player, tried an other conversion cable from SCART to S-Video but it didn’t change anything,

  My question is simple : is there a way to fix this with a post-processing video filter in ffmpeg ?

  I already looked at the long list of video filter available in ffmpeg but I didn’t find anything.

  Also, please note I can’t apply filter during the capture commands (old capture cards, old cpu, ..), this is why I capture in rawvideo and native audio. When the capture is done I convert the video/audio into h264/vorbis, at this step I can apply as much as audio/video filtering needed (even if it include extracting chroma & luma to new files, fixing and merging again).

  Thanks !