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Thread: Hauppauge HD-PVR 1212 capture

  1. #1
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    Hauppauge HD-PVR 1212 capture

    OK, I guess this has been covered somewhere already, but my question is short for those in the know (which I'm not one of). I use the following command to capture from either SVHS tapes or from live TV:

    ffmpeg -i /dev/videoN -vcodec copy -acodec ac3 -ab 448k ~/capture.mp4


    I like ffmpeg better than cat because I can set acodec and ab. But when the capture is commencing I can't view it on my computer.

    How can I also view on my computer whatever the ffmpeg is capturing?

    Thanks for letting me post one more HD-PVR and vid-cap thread.

  2. #2
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    Re: Hauppauge HD-PVR 1212 capture

    couldn't you opena second terminal window and use a command like this?
    Code:
    mplayer ~/capture.mp4
    there would obviously be a little lag but that should work. or is there someway to use all one command where it not only captures the output of /dev/videoX but also displays it using a pipe and exec somehow?
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  4. #4
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    Re: Hauppauge HD-PVR 1212 capture

    FFmpeg can have multiple outputs, and it can output to stdout; any player that can take input from stdin (vlc, totem, mplayer can all do this) can play that through a pipe. I've also updated the syntax to be in line with current correct ffmpeg usage (see here for more info):

    Code:
    ffmpeg -i /dev/videoN -c:v copy -c:a ac3 -b:a 448k ~/capture.mp4 \
    -c:v copy -c:a ac3 -b:a 448k -f mp4 - | vlc -
    Dannyboy's solution will also probably work.
    Last edited by evilsoup; January 3rd, 2013 at 05:23 PM.

  5. #5
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    Re: Hauppauge HD-PVR 1212 capture

    Eventually a tee pseudo-muxer should make its way into ffmpeg which would be useful for this sort of thing since it can create several outputs from encoding just once.

  6. #6
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    Re: Hauppauge HD-PVR 1212 capture

    Quote Originally Posted by evilsoup View Post
    FFmpeg can have multiple outputs, and it can output to stdout; any player that can take input from stdin (vlc, totem, mplayer can all do this) can play that through a pipe. I've also updated the syntax to be in line with current correct ffmpeg usage (see here for more info):

    Code:
    ffmpeg -i /dev/videoN -c:v copy -c:a ac3 -b:a 448k ~/capture.mp4 \
    -c:v copy -c:a ac3 -b:a 448k -f mp4 - | vlc -
    Dannyboy's solution will also probably work.


    I entered as you specified (using correct device#, output path/file name, of course) and get errors. I'll post results later tonight. Maybe someone can help with the problem.

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    Re: Hauppauge HD-PVR 1212 capture

    i've successfully used 2 different terminal windows to show what is being captured from HD PVR. these are the following commands I use

    Code:
    cat /dev/video0 > /home/username/video/video.ts
    Code:
    vlc /home/username/video/video.ts
    Then you just use ctrl-c in the terminal window that has the cat command to quit the recording.
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  8. #8
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    Re: Hauppauge HD-PVR 1212 capture

    Quote Originally Posted by dannyboy79 View Post
    i've successfully used 2 different terminal windows to show what is being captured from HD PVR. these are the following commands I use

    Code:
    cat /dev/video0 > /home/username/video/video.ts
    Code:
    vlc /home/username/video/video.ts
    Then you just use ctrl-c in the terminal window that has the cat command to quit the recording.
    Thank you Danny. I've done this one and it works, but I don't like the quality that cat gives. Also, I want to monitor it real-time on my computer monitor as it's being recorded. I tried VLC, using the hd-pvr as the capture device, but it too gives a strange-looking image (with the same lines in it that cat gives). If I knew better how to send ffmpeg output to 2 different outputs (my file, and stdout), and then pipe stdin into vlc, as evilsoup showed, I think that'd be what I'm looking for, but even when I translate his command into the old (my Natty) syntax it gives me an error. I'll post that error later tonight.

  9. #9
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    Re: Hauppauge HD-PVR 1212 capture

    PS: Do you think setting ffmpeg's output to stdout by specifying - as the output file, and then use tee and use ffmpeg with stdin and my file as the output, and followed by the vlc command with stdin would work?

  10. #10
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    Re: Hauppauge HD-PVR 1212 capture

    I would strongly recommend updating to a newer version of ffmpeg. Use this PPA.

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