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• Will ffmpeg transcoding change the media's duration ?

  6 juillet 2012, par MaiTiano

  For example, I have a example flv media : 1775818137_1775828481_10344.flv. Only audio data has contained in it. (No video data)

  The major properties of this flv are :

  _____________________________________________________________________
  
  Format                                   : Flash Video
  
  
  
  File size                                : 87.4 KiB
  
  
  
  Duration                                 : 494 hours
  
  
  
  Overall bit rate mode                    : CBR
  
  
  
  Overall bit rate                         : 0 bps
  
  
  
  Writing application                      : Lavf53.4.0
  
  
  
  Audio
  
  
  
  Format                                   : MPEG Audio
  
  
  
  Format version                           : Version 1
  
  
  
  Format profile                           : Layer 3
  
  
  
  Mode                                     : Joint stereo
  
  
  
  Mode extension                           : MS Stereo
  
  
  
  Codec ID                                 : 2
  
  
  
  Codec ID/Hint                            : MP3
  
  
  
  Duration                                 : 49hours
  
  
  
  Bit rate mode                            : CBR
  
  
  
  Bit rate                                 : 64.0 Kbps
  
  
  
  Channel(s)                               : 2 channels
  
  
  
  Sampling rate                            : 44.1 KHz
  
  
  
  Compression mode                         : Lossy
  
  
  
  Stream size                              : 13.3 GiB
  
  
  
  _____________________________________________________________________

  Because this is the flv piece generated from the Suse10.0 server, the timestamp may be not correctly wrote into the flv metadata. Therefore, the Duration item listed above is not the real time of it.
  I has record the time in its file name.
  So, the beginning time is 1775818137 ms
  the ending time of this flv is 1775828481 ms
  The actual duation of this flv is 10344 ms which is about 10 seconds.

  **HERE IS MY QUESTION -.- **

  When I use ffmpeg to transcode flv fromat into ts format, like this,

  ./ffmpeg -i 1775818137_1775828481_10344.flv -f mpegts -vn -acodec libfaac -ar 44100 -ab 48k 1775818137_1775828481_10344.ts

  Is there possibility that the duration of final gotten ts file is not equal to the duation of original flv file ? In other words, the ts file's duration is not 10344ms.

• How to remove "Writing library" from .mp3 ?

  15 mars 2021, par WarNight

  I am trying to encode .mp3 without encoder information ("Writing library"), but it fails.
I already try :

  


  

  1. ffmpeg -i test.wav -map_metadata -1 -map_chapters -1 test.mp3

  


  2. ffmpeg -i test.wav -write_xing 0 -id3v2_version 0 test.mp3

  


  


  and

  


  

  3. ffmpeg -i test.wav -write_xing 0 -id3v2_version 0 -map_metadata -1 -map_chapters -1 test.mp3

  


  


  but "Writing library : LAME3.100" still exists...

  


  General
Complete name               : C:\Users\User\Videos\test.mp3
Format                      : MPEG Audio
File size                   : 1 010 KiB
Duration                    : 1 min 4 s
Overall bit rate mode       : Constant
Overall bit rate            : 128 kb/s
Writing library             : LAME3.100

Audio
Format                      : MPEG Audio
Format version              : Version 1
Format profile              : Layer 3
Format settings             : Joint stereo / MS Stereo
Duration                    : 1 min 4 s
Bit rate mode               : Constant
Bit rate                    : 128 kb/s
Channel(s)                  : 2 channels
Sampling rate               : 48.0 kHz
Frame rate                  : 41.667 FPS (1152 SPF)
Compression mode            : Lossy
Stream size                 : 1 010 KiB (100%)
Writing library             : LAME3.100


  


  What do I need to do to remove this metadata ?
(Writing library)

  


• Batch concation of multiple videos files (Bash)

  4 janvier 2024, par pops64

  I have clips from multiple different scenes in the same folder I was wondering if any one had a script that groups clips belonging to each scene together than pass them into ffmpeg for a concatenation and transcode. The file name pattern is uniform. And ids are separated by a hyphen with only the scene id being unique. I am currently doing this scene by scene in FFmpeg batch av converter but any help automating this in bash or powershell would be greatly appreciated. I just can't figure out where to start

  


  {name_of_scene}-{scene_id}-{clip_id}-{resolution}.{filetype}