Ffmpeg build alsa how to#
Ffmpeg build alsa install#
Ffmpeg build alsa zip file#

Ffmpeg build alsa install#

Hi, I'm trying to cross compile and install ffmpeg with alsa and fdk-aac plugins for Raspberry Pi.

Ffmpeg build alsa zip file#

I downloaded the zip file here: and I know it's not installed, but when I click on the ffmpeg it just opens the command line.

Ffmpeg build alsa how to#

Hey, I can't figure out how to properly install ffmpeg on OS X. Next message (by thread): ffmpeg-devel.log.20160714.Previous message (by thread): ffmpeg-devel.log.20160713.Where the output pcm points to the output device you want the audio to go to.įfmpeg -f alsa -channels 2 -sample_rate 44100 -i loopout .20160714 burek burek021 at Record audio from an application while also routing the audio to an output device You can now record audio from a running application using:įfmpeg -f alsa -channels 2 -sample_rate 44100 -i hw:Loopback,1,0 out.wav Set the default ALSA audio output to one substream of the Loopback device in your. Looking at our example device listing, this would be the same as this:įfmpeg -f alsa -channels 1 -sample_rate 44100 -i default:CARD=ICH5 -t 30 out.wav When doing screencast recordings, you usually want to record your voice too:įfmpeg -f alsa -channels 1 -sample_rate 44100 -i hw:0 -t 30 out.wav Usually the default value is '1' (mono) for Mic input and '2' (stereo) for Line-In input.Įxamples Record audio from your microphone Specifying audio channels will force the audio card to record the audio as mono, stereo or even 2.1/5.1 (if supported by your audio card).Usually the default value is '48000' (Hz). Specifying audio sampling rate/frequency will force the audio card to record the audio at that specified rate.The only useful audio input options for ALSA input are -sample_rate (audio sample rate) and -channels (audio channels). It will let you visually select, for each specified card (Intel or USB), which recording device do you want to use (if the specified card has got multiple inputs, like Line-In, CD-In, Mic, etc), so you can just run alsamixer, press F6 to choose the card, and then use TAB key to switch to recording devices (pressing it multiple times just switches between playback/recording/all devices), after that just use arrow keys to highlight desired device and just hit the SPACEBAR key to select it (and up/down, page up/dn keys to change the input volume).

You might find useful a tool named alsamixer. This way, you're always asking for the input from that certain device (the default recording device from the USB Audio device) and will never mix things up. We can tell ffmpeg exactly what card we want to use, specifying the exact card's name, no matter which ordering it is, like this:įfmpeg -f alsa -i default:CARD=U0x46d0x809 -t 30 out.wav Typing arecord -L will give us a little bit more detailed listing of recording devices:ĭiscard all samples (playback) or generate zero samples (capture)Ĥ.0 Surround output to Front and Rear speakersĤ.1 Surround output to Front, Rear and Subwoofer speakersĥ.0 Surround output to Front, Center and Rear speakersĥ.1 Surround output to Front, Center, Rear and Subwoofer speakersħ.1 Surround output to Front, Center, Side, Rear and Woofer speakers You might want to play with udev rules, but there is an easier solution for this. If you reboot your machine, you will notice sometimes your cards get reordered, so 'card 0' is listed as USB Audio and 'card 1' is listed as Intel audio card. The best way is to select your card and default recording device with the alsamixer tool, because some audio cards have a complicated way of selecting the default input through the ffmpeg command line. For example, to select 'MIC2 ADC' from Intel card (look above at the list), we would use:

The default recording device can be selected using the alsamixer tool (see below) or specifying the device using an additional parameter Y in hw:, where =card, =device. That will give us a 30 seconds WAV audio output, recorded from our USB camera's default recording device (microphone). The easiest thing to do is to reference each of them directly using -f alsa -i hw:0 or -f alsa -i hw:1: We can see there are 2 audio cards installed that provide capturing capabilities, namely 'card 0' (Intel ICH5) and 'card 1' (Microphone on the USB web cam). **** List of CAPTURE Hardware Devices ****Ĭard 0: ICH5, device 0: Intel ICH Ĭard 0: ICH5, device 1: Intel ICH - MIC ADC Ĭard 0: ICH5, device 2: Intel ICH - MIC2 ADC Ĭard 0: ICH5, device 3: Intel ICH - ADC2 Ĭard 1: U0x46d0x809, device 0: USB Audio To get the list of all installed cards on your machine, you can type arecord -l or arecord -L (longer output). Input_device tells ffmpeg which audio capturing card or device you would like to use. See the FFmpeg ALSA input device documentation for more info.

Record audio from an application while also routing the audio to an …Ĭapturing audio with ffmpeg and ALSA is pretty much straightforward:.