Recherche avancée

Sur d’autres sites (8548)

• avutil/timecode : Avoid fps overflow

  1er mars 2021, par Michael Niedermayer

  avutil/timecode : Avoid fps overflow
  Fixes : Integer overflow and division by 0
  
  Fixes : poc-202102-div.mov
  Found-by : 1vanChen of NSFOCUS Security Team
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavutil/timecode.c

• Questions about license of ffmpeg in Android [on hold]

  23 décembre 2016, par Season

  I want to make an video editing app(may include advertisement or even earn money).

  And I found that ffmpeg is a great library for my app.

  And I can use it for compress video, trim video and change video format.

  The commands that the app may use :

  Reducing video size with same format and reducing frame size

  Cutting the videos based on start and end time using ffmpeg

  I found that ffmpeg is using LGPL and partially GPL licenses but I do not familiar with these two terms.

  What should I do so that I can use ffmpeg legally ?

• Ffmpeg. Best way to rip dvd and convert mov into lossless mp4 that is playable in QuickTime on Mac ?

  19 octobre 2022, par Liam

  I’ve been ripping my collection of anime dvds with MakeMKV and converting them into .mp4 files using Ffmpeg.

  


  There are a couple things I need help with-
I’ve noticed that using the command ffmpeg -i input.mkv output.mp4 works in converting the mkv into a playable mp4 file in QuickTime player but that it has a smaller file size than the original MKV file.

  


  Does this indicate a loss in quality ?

  


  I’ve used another command
Ffmpeg -i input.mkv -c copy output.mp4

  


  to convert the MKV file into mp4 and the file is identical in size but will not play in QuickTime as the previous converted file did despite both being mp4.

  


  Does this mean that this mp4 file is just as recognisable as an mkv file ?

  


  I then did another command which may be the best as it plays in QuickTime but it resulted in by far the largest output file size.

  


  Ffmpeg -i input.mkv -crf 01 output.mp4

  


  The last command I used is almost the same as previous but doesn’t play in QuickTime for unknown reasons.

  


  Ffmpeg -i input.mkv -crf 00 output.mp4

  


  Results in huge file size and mp4 file which won’t play in QuickTime.

  


  Please can you shed some light on these issues and advise me on if these commands are best to use for lossless quality ?

  


  The Dvds and files are standard definition and animated in the 90s so that might be worth mentioning.