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• avfilter : update filter timeline state only on main link

  1er mars 2024, par Gyan Doshi

  avfilter : update filter timeline state only on main link
  At present, consume_update evaluates timeline state on all links for
  
  a multi-input filter. This can lead to the filter being incorrectly
  
  en/dis-abled when evaluation on a frame on a secondary link leads to
  
  a different result than the frame on the current main link next in
  
  line for processing.
  

  • [DH] libavfilter/avfilter.c

• lavu/hwcontext_qsv : Join the download/upload session to the main session

  11 mars 2024, par Haihao Xiang

  lavu/hwcontext_qsv : Join the download/upload session to the main session
  This may reduce the number of internal threads when using hwupload or
  
  hwdownload filter.
  Signed-off-by : Haihao Xiang <haihao.xiang@intel.com>
  

  • [DH] libavutil/hwcontext_qsv.c

• Java Process start a subprocess and the main process cannot be terminated [closed]

  10 avril 2024, par Dodge_X

  I use java Process to run a script, the main process of the script start a subprocess, and the subprocess hanging, so I could not monitor if the script is closed.

  


             Process process = processBuilder.command(commands).start();
           try (BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()))) {
                String line;
                while ((line = reader.readLine()) != null) {
                    log.info("win exec get msg:{}", line);
                }
            }

            // cannot be finished here 
            int exitCode = process.waitFor();
            log.info("script exited with code: " + exitCode);


  


  This command executes a python script, which uses ffmpeg to generate a video.

  


  import subprocess
import time
import signal


command = "ffmpeg -framerate 5 -i F:\\screenshots\\screenshot_%04d.png -c:v libx264 -pix_fmt yuv420p -y F:\\website_recording.mp4"
p = subprocess.Popen(command, shell=True, close_fds=True)

pid = p.pid
time.sleep(10)
p.send_signal(signal.SIGTERM)

print("process finished")


  


  The problem is that the ffmpeg subprocess is attached to the java started process, so it could not be terminated while the script was exiting. I have to kill the ffmpeg subprocess first that the exit code can be obtained.