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 Forum index » Advanced Topics » Additional Software (PETs, n' stuff) » Multimedia
Using FFMPEG To Record Video & Sound in Puppy
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Joined: 10 Sep 2011
Posts: 4740
Location: Mer méditerrannée (1 kms°)

PostPosted: Wed 05 Jun 2013, 13:37    Post_subject: vidcap is absolutely perfect !
Sub_title: nice tool

vidcap is absolutely perfect ! tested on precise 5.4.3 retro. Colors are pure, as the screen. sound working. What more is asked ? Nothing.
After deeper tries :
nevertheless, the file is big, we cannot modulate duration and filmed zone. But it is a good alternative.
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Joined: 04 May 2005
Posts: 113
Location: Melbourne, Australia

PostPosted: Wed 02 Apr 2014, 06:08    Post_subject:  

Further to this discussion...

I'm watching a streaming video with sound in Firefox (try this with any YouTube video.. but it can be any number of flash-based streams)... and I can see the video Ok and hear the audio Ok.

Using a derivative of the original script ffmpeg command (and I want to be able to use just ffmpeg for this job), I can capture the video but I can't capture the audio. All that is contained in the audio output stream is silence.

The modified command (to simply try and grab the audio):

ffmpeg -f alsa -ac 2 -i hw:0,0 test.mp3

To ensure I'm looking at the right audio capture device, I've looked at the output from arecord -l (small 'ell'), viz:-

**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: VT1708S Analog [VT1708S Analog]
  Subdevices: 2/2
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
card 2: Alpha [Lexicon Alpha], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Now, if I supply an audio signal into the "mic in" on the PC, the above command works a treat, which is what I'd expect -- hw:0 is a hardware device, so inputs via hardware should work Ok.

...but when a streaming video is playing and I want to capture the audio from THAT, there has to be something 'software-wise' that I can finger into to capture the audio. Maybe there's something I need to look at in alsamixer or retrovol...?

Any other thoughts?! I'm using Slacko 5.6.4, BTW...

Once I get the 'audio' component working Ok, I should be able to capture the video AND audio by combining a couple of 'input' streams through ffmpeg, methinks..

Thanks for any forthcoming suggestions.

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