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• 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

• Docker alpine : ffprobe not found in $PATH

  5 mars 2023, par Harun Sasmaz

  I have a Go program that executes ffmpeg and ffprobe commands, so I need to install them in my Docker container.

  


  Here is my Dockerfile :

  


  FROM golang:1.17.7-alpine

WORKDIR /src
COPY go.mod go.sum ./
RUN go mod download
COPY . .
RUN go build -o ./server cmd/service/main.go

RUN apk update
RUN apk upgrade
RUN apk add --no-cache ffmpeg

FROM alpine
COPY --from=0 /src/server /usr/bin/server
CMD ["server"]


  


  However, when I run container, it says :

  


  exec: "ffprobe": executable file not found in $PATH


  


  How can I fix it ?

  


• How do I enable ffmpeg python inside a docker ?

  4 mars 2024, par Noam Zadok

  I have a problem with enabling ffmpeg streaming inside my Docker container, and specifically, inside a Python service running inside the Docker.
I need to stream my screen view, and I'm using the 'x11grab' source, and the destination is an RTSP server (AWS IVS). This is my code for the stream :

  


  bit_rate = f"{self.config_service.thermal_stream_bit_rate}k" # 150k
vsync_param = self.config_service.stream_vsync_param # 'cfr'
frame_rate = self.config_service.stream_frame_rate # 5
stream_command = ffmpeg.input(
                os.getenv('DISPLAY'), # env var passed into the container
                s=f"{self.config_service.display_width}x{self.config_service.display_height}",
                f="x11grab",
                r=frame_rate,
                fflags="nobuffer+discardcorrupt+shortest",
                loglevel="level+debug",
            )..output(
                self.dest_path, # My rstp url
                vcodec='nvenc_h264',
                preset='hp',
                pix_fmt=pix_format_param,
                tune="zerolatency",
                b=bit_rate,
                g=keyframe_interval_seconds,
                r=frame_rate,
                format="flv",
            )
streaming_process = await stream_command.run_asyncio(pipe_stderr=True)


  


  When I run the code, I receive this error : x11grab: No such file or directory.

  


  When I enter the Docker container, and run Python, and then the script :

  


  import ffmpeg

>>> x11_display = ':0'
>>> format = "x11grab"
>>> screen_width = f"1920x1080"
>>> bit_rate = "150k"
>>> pix_format_param = "yuv420p"
>>> keyframe_interval_seconds = 2
>>> frame_rate = 5
>>> dest_path = 'rtmps://XXXX.global-contribute.live-video.net:443/app/YYYY'
>>> command = ffmpeg.input(x11_display, s=screen_width, f="x11grab", r=frame_rate, fflags="nobuffer+discardcorrupt+shortest", loglevel="level+debug",).output(dest_path, vcodec='nvenc_h264', preset='hp', pix_fmt=pix_format_param, tune="zerolatency", b=bit_rate, g=keyframe_interval_seconds, r=frame_rate, format="flv",)
>>> command.run()


  


  The stream is starting. I took the exact command by printing inside my service script (print the ffmpeg.input, and the ffmpeg.output).
Also, when I tried async running the command (as in my script) inside the Python console, it also succeeded, so it's not related to that. Basically there are no functional differences between the commands.
I've tried comparing the Python version, the ffmpeg version, the file system permissions - they are the same in the script run and in the python console.
I don't understand what configuration am I missing.
Thank you in advance.