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Canek Peláez Valdés <caneko@×××××.com> [14-06-16 04:33]: |
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> On Sun, Jun 15, 2014 at 1:04 PM, Canek Peláez Valdés <caneko@×××××.com> wrote: |
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> > On Sun, Jun 15, 2014 at 12:54 PM, <meino.cramer@×××.de> wrote: |
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> >> Hi, |
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> >> |
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> >> After unsuccessfully trying vlc with a Logitech C920 HD Pro Webcam |
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> >> (over 2 seconds delay between audio and video). I played around |
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> >> with gstreamer and from bits and pieces from the web I build |
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> >> this line: |
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> >> |
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> >> gst-launch-1.0 v4l2src device=/dev/video1 ! video/x-h264,width=1920,height=1080,framerate=30/1 ! \ |
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> >> h264parse ! muxout. alsasrc device="hw:3,0" ! queue ! audioconvert ! lamemp3enc ! \ |
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> >> muxout. matroskamux name=muxout streamable=true ! filesink location=c920.mp4 |
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> >> |
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> >> which records a Full HD video with audio to my harddisc. The delay is |
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> >> minimal and the sync between audio and video is good. |
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> >> |
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> >> But there is one disadvantage: |
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> >> I cannot see what I am recording and I cannot watch the webcams stream |
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> >> before I fire up the script because otherwise the device would be "already |
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> >> in use" (I dont like scripts, which simply kill other applications when |
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> >> called). |
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> >> |
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> >> Any ideas or hints how to manage that? |
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> > |
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> > Use the tee element. I'm in a hurry, so I cannot test a pipeline right |
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> > now, but I will try later. Meanwhile, just try to put a queue element |
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> > after each path of the tee. |
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> > |
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> > gst-inspect-1.0 tee |
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> |
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> OK, it took me a bit of an effort, but this is my pipeline: |
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> |
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> gst-launch-1.0 v4l2src norm=NTSC device=/dev/video1 ! queue ! |
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> deinterlace mode=1 ! videorate ! |
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> video/x-raw,format=YV12,width=720,height=480,framerate=30000/1001 ! |
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> tee name=t t. ! queue ! videoconvert ! mpeg2enc ! avimux ! filesink |
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> location=file.avi t. ! queue ! videoconvert ! autovideosink |
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> |
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> My hardware is much more limited (analog RGB), so resolution and |
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> famerate are accordingly lower. This captures to an AVI file encoded |
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> to MPEG2 the video signal, and at the same time it opens a window to |
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> show the stream. |
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> |
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> It should not be that much of a problem to modify it to your needs; |
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> just notice that I didn't capture audio. |
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> |
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> Regards. |
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> -- |
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> Canek Peláez Valdés |
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> Profesor de asignatura, Facultad de Ciencias |
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> Universidad Nacional Autónoma de México |
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> |
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|
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Hi Canek, |
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Thanks a lot for your effort!!! 8) |
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Is there any documentation out there about this "How to build |
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a pipeline with gst-launch", which you would recommend to read? |
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I will see how I can map your example to my code I have already, which |
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handles audio and video... |
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Best regards, |
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mcc |
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