Sur d’autres sites (12787)

• regex for files recognition for ffmpeg command

  10 avril 2015, par Vishal Desai

  I’m trying to use ffmpeg command to create a time-lapse from a bunch of images in a folder. The images are named in the format -
  folder_number ;timestamp.jpg
  eg,
  0 ;1423116000.jpg
  0 ;1423137600.jpg

  I run the following command,

  ffmpeg -i %*.jpg -q:v 2 output.mpeg

  the video is getting formed but it is a 30seconds video with only the first image in the folder.

  I only assume the regex i’m using - %*.jpg is wrong. Please help.

  ps : I’m newbie to ffmpeg

• How to print Continuous output of Popen when reset character is used

  25 août 2022, par cclloyd

  I have a snippet of code that runs a video conversion using ffmpeg.

  


  I read the output to analyze it later in the application, and also want to print it to console, for user feedback.

  


  So I have

  


  p = Popen(['ffmpeg', *args], stderr=STDOUT, stdout=PIPE)
while True:
    line = p.stdout.readline()
    if not line: 
        break
    print(line.decode('utf-8'), end='')

p.wait()
if p.returncode == 0:
    pass



  


  Which works, somewhat. It prints the initial output of the ffmpeg command, as those are simple print statements.

  


  But once the conversion starts, all the output is updated on one line, presumably using some reset character to move the cursor position back to the start of the line.

  


  Is there a way to continue to print that output ?

  


  Edit :

  


  Answer

  


  p = subprocess.Popen(args, stderr=subprocess.STDOUT, stdout=subprocess.PIPE, universal_newlines=True)

with p.stdout:
    for line in iter(p.stdout.readline, None):
        if not line:
            break
        if line.startswith('frame'):
            print(f'\033[2K{line.strip()}\r', end='')
        else:
            print(line, end='')


  


  This includes the cursor return, and clears the current line before printing to it again. And still prints the part I want on the same line, like it normally does.

  


• How to get video stream information with RtspClientSharp library ?

  13 septembre 2022, par theateist

  I use RtspClientSharp to receive video frames from rtsp stream. The library allows just to receive the frames. But, I need to get information about the stream, such as bitrate, codec and etc. I don't see that there is currently an option for this in the library.

  


  

  1. Do I miss something or I need to modify the RtspClientSharp code to support this ?

  


  2. Other alternative is to write a helper code in c++ which uses ffmpeg. I can use pinvoke to call c++ code which will connect to the rtsp stream (in addition to RtspClientSharp client), get the stream information and send it back to my c# code. Is this a better alternative ?