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• Windows : How to build X264.lib instead of .dll

  25 juin 2015, par user1884325

  I downloaded the X264 source and installed mingw.

  Step 1 :

  Executed this in the MINGW bash :

  ./configure —disable-cli —enable-shared —enable-win32thread -
   extra-ldflags=-Wl,—output-def=libx264.def

  and then ’make’

  Step 2 :

  Renamed the libx264-142.dll to libx264.dll and Opened up VS2012 Command Prompt and executed this :

  LIB /DEF:libx264.def

  which gave me libx264.lib and object libx264.exp

  Step 3 :

  Included the lib file in a VS2012 project which uses the X264 API.

  Problem :

  When I start the project I get the following error message :

  "The program can’t start because libx264.dll is missing from your computer"

  Question :

  Why is it looking for the dll when I’m linking the static library in ?

  How do I resolve this ? I would like to build a static X264 library which I can link in with my project.

  EDIT :

  I just had to put the dll in the same directory as the project executable.

  However - My question still stands : How do I build a static x264 library ? So I don’t need the dll ?

• FFMpeg AC3 to AAC Conversion speed

  28 juillet 2022, par sweetngx

  While I don't actually have a problem with conversion, I do have a direct problem with Conversion speed. With FFMpeg, I convert ac3 (175 mb) audio files to aac (70mb) format in about 2 minutes by consuming very little cpu (5%).
I couldn't find a way to achieve this even though it's really great on my computer, I guess the problem is software... Do you think there is a way to achieve this ?
I have a lot of questions in my mind, why can't FFMPeg speed up this process at the expense of consuming more cpu, What is the obstacle ?

  


  I think I found someone having similar issue at the link below... Anyone have a better idea ?
https://forums.developer.nvidia.com/t/nvenc-with-audio-conversion-best-practice-advice/40759

  


  ffmpeg.exe -threads 32  -i "en.ac3" -map a:0 -c:a aac -b:a 128k -vn -y output.aac


  


• Why is ffmpeg cut setting the wrong duration on my output file

  9 mai 2023, par danielson317

  Setup

  


  I am trying to break a video up into parts using some basic commands I have seen available.

  


  I have tried :

  


  ffmpeg -ss 00:00:00 -t 00:11:42 -i 'original.m4v' -acodec copy -vcodec copy 'output.m4v'

  


  I also tried more generic (and much slower) :

  


  ffmpeg -ss 00:00:00 -t 00:11:42 -i 'original.m4v' 'output.m4v'

  


  I am on Ubuntu 20 with ffmpeg 4.2.7-0. I know it is a little outdated but this computer lost it's network card so I cannot update it at this time.

  


  The problem

  


  In both cases the video cuts correctly to only have the first 11:42. However the video properties state the video is 31 minutes long (the length of the original). This file size also reflects the reduced size I would expect from the cut. When I play the video in VLC it reports the video is 31 minutes long but scanning or playing past 11:42 "crashes" the playback.

  


  Question

  


  Why is the new video reporting the wrong length and how do I correct this ? Preferably in the conversion process not a secondary command.