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• delay audio stream in ffmpeg python

  2 janvier 2023, par snailoftheyear

  objective :

  


  I have separate audio and video streams. Audio stream length varies but video length is same around 60 seconds. For the first 34 seconds the audio should be empty and after 34 seconds i should play the audio according to its length and then the video should end. Generally audio length is around 15-20 seconds. I am trying to do this in ffmpeg python, i have already seen some answers on stackoverflow using itsoffset but they all were on using cmd and i can't get my head around it.
Code i am working

  


  import ffmpeg
import textwrap

readAloudText = "The medical center issued a statement saying that patient care was not compromised while their data was unavailable. Still, it's unsettling to hear that a hospital is shut out of parts of its own computer systems and unable to communicate electronically."

wrapper = textwrap.TextWrapper(width=150) 
word_list = wrapper.wrap(text=readAloudText) 
caption_new = ''
for ii in word_list[:-1]:
    caption_new = caption_new + ii + '\n'
caption_new += word_list[-1]

in_video = ffmpeg.input('readaloud.mov')
in_audio = ffmpeg.input('readaloudaudio.wav')

(
    ffmpeg
    .drawtext(in_video, text=caption_new, fontcolor='black', fontsize='24', start_number=0, x=50, y= 600)
    .output(in_audio ,'output.mp4')
    .run()
)


  


  Thanks in advance

  


• How to quit pexpect launched ffmpeg with key q pressed

  25 février 2014, par Shuman

  i used pexpect to call ffmpeg which is a lengthy process. it took half an hour, how can i detect user has pressed q key to stop it ? just like when you press q when using ffmpeg command line tool

  the ffmpeg command line is
  ffmpeg -y -i url -c copy -absf aac_adtstoasc out.mp4

  the last line of ffmpeg output is

  ...
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (copy)
  
    Stream #0:2 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=   84 fps= 77 q=-1.0 Lsize=  184626kB time=00:00:06.96 bitrate=217120.3kbits/s

  the code i have now is

  reo = re.compile("""\S+\s+(?P\d+)  # frame
  
                       \s\S+\s+(?P<fps>\d+)           # fps
  
                       \sq=(?P<q>\S+)                    # q
  
                       \s\S+\s+(?P<size>\S+)          # size
  
                       \stime=(?P<time>\S+)           # time
  
                       \sbitrate=(?P<bitrate>[\d\.]+) # bitrate
  
                       """, re.X)
  
  
  
  durationReo = (&#39;(?&lt;=Duration:\s)\S+(?=,)&#39;)
  
  
  
  cpl = thread.compile_pattern_list([
  
      pexpect.EOF,
  
      reo,
  
      durationReo
  
  ])
  
  
  
  while True:
  
      i = thread.expect_list(cpl, timeout=None)
  
      if i == 0: # EOF
  
          print "the sub process exited"
  
          break
  
      elif i == 1:
  
          frame_number = thread.match.group(0)
  
          print frame_number
  
          print reo.search(frame_number).groups()
  
          # thread.close
  
      elif i == 2:
  
          durationLine = thread.match.group(0)
  
          print &#39;Duration:&#39;, durationLine
  
          # print "something :",thread.match.group(1)
  
          pass
  
  </bitrate></time></size></q></fps>

  with this code i can already get the frame info and duration info, the ultimate goal is to create a textual progress bar with another python progressbar module. but with the ability to send the 'q' pressed signal to ffmpeg child process.

• lavc/vvc : Fix check whether QG is in first tile col

  19 mars 2024, par Frank Plowman

  lavc/vvc : Fix check whether QG is in first tile col
  The second part of this condition is intended to check whether the
  
  current quantisation group is in the first CTU column of the current
  
  tile.  The issue is that ctb_to_col_bd gives the x-ordinate of the first
  
  column of the current tile *in CTUs*, while xQg gives the x-ordinate of
  
  the quantisation group *in samples*.  Rectify this by shifting xQg by
  
  ctb_log2_size to get xQg in CTUs before comparing.
  Fixes FFVVC issues #201 and #203.
  

  • [DH] libavcodec/vvc/vvc_ctu.c