I am trying to make a screen casting tool based on the GStreamer libs.
The application combines a screen capture with the webcam video and
microphone streams. The pipeline is constructed using gst_parse_launch
from this text:
mic. ! queue
! ffenc_wmav2 bitrate=100000
! muxer.
desktop. ! queue
! ffmpegcolorspace
! videoscale
! videorate
! video/x-raw-yuv,width=640,height=400,rate=15/1
! videobox right=-320
! ffmpegcolorspace
! vmix.sink_0
webcam. ! queue
! ffmpegcolorspace
! videoscale
! videorate
! video/x-raw-yuv,width=320,height=240,rate=15/1
! vmix.sink_1
logo. ! queue
! jpegdec
! ffmpegcolorspace
! videoscale
! videorate
! video/x-raw-yuv,width=320,height=160,rate=15/1
! vmix.sink_2
vmix. ! t.
t. ! queue
! ffmpegcolorspace
! ffenc_wmv2 bitrate=700000
! muxer.
t. ! queue
! ffmpegcolorspace
! dshowvideosink
muxer. ! queue
! filesink location="opname.wmv"
dshowaudiosrc name="mic"
gdiscreencapsrc name="desktop"
dshowvideosrc name="webcam"
multifilesrc name="logo" location="chrome/skin/ivpv.jpg"
videomixer name=vmix
sink_0::xpos=0 sink_0::ypos=0 sink_0::zorder=0
sink_1::xpos=640 sink_1::ypos=0 sink_1::zorder=1
sink_2::xpos=640 sink_2::ypos=240 sink_2::zorder=2
tee name="t"
ffmux_asf name=muxer
This produces an output file successfully, however there are a few issues:
- audio playback is a little too fast (around 25% too fast I think).
- audio is distorted there are crack and thud noises (similar to the
sound of raindrops when standing under an umbrella).
Does anyone have an idea how to fix these problems?
I am using windows (Vista and 7) and I use the WinBuilds distribution
on GStreamer (the most recent GPL release).
Grts,
Francis
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