使用gst-launch将视频帧输出到帧缓冲区上的特定位置 [英] Use gst-launch to output a video frame to certain position on framebuffer

问题描述

当前，我们正在使用以下命令来播放视频片段:

Currently we are using below command to play a video clip:

gst-launch filesrc location=/media/sda1/mpeg4_640x480.mp4 ! decodebin2 name=dec ! queue ! ffmpegcolorspace ! videoscale ! video/x-raw-rgb,width=320, height=240 ! fbdevsink dec. ! queue ! audioconvert ! autoaudiosink

视频帧重新调整为320x240并输出到帧缓冲区.但是，我们想将视频帧设置为特定(x，y).有可能吗?

The video frame is reiszed to 320x240 and outputted to the framebuffer. However, we'd like to set the video frame to certain (x, y). Is that possible?

推荐答案

尝试使用"videobox"元素.在top，left，bottom和right属性中，正值用于裁切，因此您要使用负值进行补偿.

Try using the "videobox" element. In the top, left, bottom, and right properties, positive values are used for cropping, so you'll want to use negative values for offsetting.

此管道会将640x360视频测试源移动到1280x720输出的右下角:

This pipeline would move a 640x360 video test source to the bottom right corner of a 1280x720 output:

gst-launch-1.0 videotestsrc！ video/x-raw，width = 640，height = 360！ 视频转换！影音盒左= -640右= 0上== 360底= 0 =！ video/x-raw，width = 1280，height = 720！自动视频接收器

gst-launch-1.0 videotestsrc ! video/x-raw,width=640,height=360 ! videoconvert ! videobox left=-640 right=0 top=-360 bottom=0 ! video/x-raw,width=1280,height=720 ! autovideosink

您可以使用"fill"属性来控制空间的填充方式.

And you can use the "fill" property to control how the space is filled.

http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-good-plugins/html/gst-plugins-good-plugins-videobox.html

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