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• ffmpeg Need details about metadata start

  11 août 2020, par ArunKumar

  #ffmpeg a.mp4 -f ffmetadata
Gives all information about MP4 file.
In that details, there is a field 'Start = 38639.91900'. What is it meant for ?

  


  Command full Output

  


  Input #0, mpeg, from '20200811_20200811172228_20200811172437_161817.mp4' :
Duration : 00:02:09.11, start : 38639.919000, bitrate : 928 kb/s
Stream #0:0[0x1e0] : Video : h264 (Main), yuvj420p(pc, bt709, progressive), 12
80x720, 25 fps, 25 tbr, 90k tbn, 50 tbc
Output #0, ffmetadata, to 'in.txt' :
Metadata :
encoder : Lavf58.50.100
Stream mapping :
Press [q] to stop, [?] for help
size= 0kB time=-577014:32:22.77 bitrate=N/A speed=N/A
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing ove
rhead : unknown

  


• FFmpeg subtitle filter set start time

  31 décembre 2020, par CasualDemon

  I am trying to burn-in subtitles for a shorter section of a video, but using the subtitles filter always starts from the beginning of the subtitle stream, not at the specified start time, even when copying from the same video.

  


  So for example if I start an encode 10 minutes in to a film, the video will properly be set from there, but the subtitles will start from the beginning (10 minute offset in this case).

  


  ffmpeg -y -ss 600.0 -to 660.0 -i movie.mkv -filter_complex "[0:0]subtitles='movie.mkv':si=1[v]" -map "[v]" -c:v libx265 -crf 22 output.mkv


  


  This is not a problem when using picture based subtitles and the overlay filter, such as :

  


  -filter_complex "[0:0][0:2]overlay[v]"


  


  It seems to only affect text based subtitles. I don't know if this is just not possible and will require another solution, or if I am approaching it wrong. Any help is appreciated !

  


• ffmpeg trim mp3 - determine precisely the start and end times of section to be trimmed

  4 février 2019, par Ahmed Khalil

  I have a long mp3 track of an audio book (more than 9 hours long) that I would like to trim using ffmpeg.

  The sample code below is used to trim an mp3 section by providing the start and end times. However, when I determine the start and end times, then checking the output file, it’s not as precisely as I want, sometimes several minutes ahead/before the desired point.

  import subprocess
  
  file = r'audio book.mp3'
  
  track_name = "trimmed section"
  
  output = r'D:\{0}'.format(track_name)
  
  start = '01:26:04'
  
  end = '01:33:17'
  
  
  
  d = subprocess.getoutput('ffmpeg -i "{0}" -ss {1} -to {2} -c copy {3}.mp3"'
  
                       .format(file, start, end, output))
  
  
  
  print(d)

  Is there a way to determine with accuracy the real start and end time of an mp3 audio track, to be given afterwards as inputs to the code...to trim the desired sections all at once, without the need to adjust/fine-tune the start and end time manually ??