我在 gstreamer 中看到过这种管道运行命令：
例如，
gst-launch-1.0 videotestsrc ! video/x-raw, format=I420, framerate=25/1, width=640, height=360 ! xvimagesink
我已经阅读了一些video/x-raw, format=I420, framerate=25/1, width=640, height=360指定媒体类型的页面。但我无法理解它会产生什么效果 - 是将输入转换为指定的帧率/格式/宽度/高度等......还是就像指定输入已经在这个帧率/宽度/ht中一样？如果它只是指定输入在此帧速率等中，它会对管道产生什么影响......而不是转换。
它真的有必要还是我们可以忽略它？
我正在使用以下命令来做到这一点：
/usr/local/bin/gst-launch-1.0 filesrc location=/home/ubuntu/DELTA.mpg ! textoverlay text="Hello" ! filesink location=/home/ubuntu/delta2.mpg
但是我得到以下输出：
ubuntu@ip-10-185-10-118:~$ /usr/local/bin/gst-launch-1.0 filesrc location=/home/ubuntu/DELTA.mpg ! textoverlay text="Hello" ! filesink location=file4.mpg
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
WARNING: from element /GstPipeline:pipeline0/GstTextOverlay:textoverlay0: Could
not multiplex stream.
Additional debug info:
gstbasetextoverlay.c(1892): gst_base_text_overlay_video_event(): /GstPipeline:pipeline0/GstTextOverlay:textoverlay0:
received non-TIME newsegment event on video input
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
Got EOS from element "pipeline0".
Execution ended after 0:00:00.024475840
Setting pipeline to PAUSED ...
Setting pipeline to …我想显示状态消息,当单击按钮触发的处理达到不同的处理阶段时,动态更新.你能帮忙吗？这是我使用的代码,但不起作用.它总是在函数结束时显示状态msg,而不是在执行时显示中间状态msgs.
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.*;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.*;
import java.net.*;
import java.io.*;
public class MainApplet extends JApplet {
JButton gstbtn = new JButton("Connect to Gst Hotspot");
JButton wifibtn = new JButton("Connect to existing Wifi networks");
JLabel status = new JLabel();
JPanel toppanel = null, nwConfigDialog = null;
final JFrame f= new JFrame();
JTextField ssidTxt;
JPasswordField pwdTxt;
JOptionPane opt;
public void init() {
gstbtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.out.println("Gst Hotspot connect workflow triggered"); …