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• Non-monotonous DTS in output stream previous current changing to This may result in incorrect timestamps in the output file

  21 juillet 2020, par Vitalis Hommel

  I am having a file.txt with rather close snippets

  


  file 'input.mp4'
inpoint 1.5402465510368346
outpoint 2.722609395980835
file 'input.mp4'
inpoint 3.192511146068573
outpoint 7.074568028450012
file 'input.mp4'
inpoint 7.851800565719604
outpoint 9.023683423995971
file 'input.mp4'
inpoint 10.054571752548219
outpoint 12.008032734394073
file 'input.mp4'
inpoint 18.70977670431137
outpoint 21.20993923664093
file 'input.mp4'
inpoint 24.51183382153511
outpoint 26.465287650823594
...


  


  I concat them with

  


  ffmpeg -safe 0 -f concat -i file.txt out.mp4


  


  and I tried

  


  ffmpeg -use_wallclock_as_timestamps 1 -safe 0 -f concat -i file.txt out.mp4


  


  Yet I get

  


  [mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 2069, current: 2067; changing to 2070. This may result in incorrect timestamps in the output file.
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 2070, current: 2067; changing to 2071. This may result in incorrect timestamps in the output file.
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 2071, current: 2067; changing to 2072. This may result in incorrect timestamps in the output file.
[aac @ 00000178c50f8a80] Queue input is backward in time
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 2758, current: 2756; changing to 2759. This may result in incorrect timestamps in the output file.
[aac @ 00000178c50f8a80] Queue input is backward in time
    Last message repeated 5 times
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7581, current: 7579; changing to 7582. This may result in incorrect timestamps in the output file.
[aac @ 00000178c50f8a80] Queue input is backward in time
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7582, current: 7579; changing to 7583. This may result in incorrect timestamps in the output file.
[aac @ 00000178c50f8a80] Queue input is backward in time
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7583, current: 7579; changing to 7584. This may result in incorrect timestamps in the output file.
[aac @ 00000178c50f8a80] Queue input is backward in time
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7584, current: 7579; changing to 7585. This may result in incorrect timestamps in the output file.
[aac @ 00000178c50f8a80] Queue input is backward in time
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7585, current: 7579; changing to 7586. This may result in incorrect timestamps in the output file.
[aac @ 00000178c50f8a80] Queue input is backward in time
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7586, current: 7579; changing to 7587. This may result in incorrect timestamps in the output file.
[aac @ 00000178c50f8a80] Queue input is backward in time
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7587, current: 7579; changing to 7588. This may result in incorrect timestamps in the output file.
[aac @ 00000178c50f8a80] Queue input is backward in time
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7588, current: 7579; changing to 7589. This may result in incorrect timestamps in the output file.
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7589, current: 7579; changing to 7590. This may result in incorrect timestamps in the output file.
[aac @ 00000178c50f8a80] Queue input is backward in time
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7590, current: 7579; changing to 7591. This may result in incorrect timestamps in the output file.
[aac @ 00000178c50f8a80] Queue input is backward in time


  


  And the final file is cut at wrong places.

  


  How to make the file.txt work ?

  


• how to save ffprobe result in json

  22 août 2018, par user1083237

  i am using the following :
  ffprobe -i bunny.mp4 -v quiet -select_streams v -print_format json -show_entries frame=pkt_pts_time,pict_type|grep -B 1 pict_type=I

  so i can save time of index frames in json file.
  also the command works just fine without the :
  "print formqt json",
  it doesnt seem to work after i add it.
  i have tried "print format json " commands like :
  ffprobe -v quiet -print_format json -show_format -show_streams "lolwut.mp4"
  and it works just fine.
  what might be the problem ?

• How to get real-time information from ffmpeg-python process ?

  10 juin 2024, par duruburak

  I've seen some people achieving to scrape out live progress data from ffmpeg subprocess. But for non-command line execution, how could this be accomplished ?

  


  For example I want to store this real-time information on the command line output line by line or get the progress percentage to the completion.


  


  import ffmpeg
import threading

def ffmpeg_func(path1, path2, path3):
    global out, err
    video_part = ffmpeg.input(path1)
    audio_part = ffmpeg.input(path2)
    ffm = ffmpeg.output(audio_part, video_part, path3).overwrite_output().run_async(pipe_stdout=True)
    out, err = ffm.communicate()
    
threading.Thread(target=ffmpeg_func, args=(<>, <>, <>)).start()


  


  I used threading.Thread because I'm intending to execute multiple ffmpeg process at the same time.