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