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• How to build FFmpeg into static libs for MacOS for usage in a C++ application

  29 septembre 2017, par Programist

  How can I build static libs of FFmpeg for MacOS.

  All I need is to make a .mp4 with H264 codecs out of some images using ffmpeg. Dont need the build to be fully loaded with features.

  I built it for iOS using a script from here which was really simple and smooth. It checked out the code & smoothly built the output into include/ & lib/ folders.

  I checked the official FFmpeg site offers excutables for MacOS. But I need static libs to use in my C++ code.

  Question :
  I want to build FFmpeg into static libs for MacOS only for creating .mp4 videos. How can I do it OR
  How can I change this script to do the same for MacOS ?

  PS :
  I am Mac OS Sierra with Xcode9

• setting bit rates in creating video from images in ffmpeg not working

  2 mai 2014, par mast kalandar

  I have a HQ video of one second

  Some information of this video is as below

  Dimensions : 1920 x 1080    
  
  Codec : H.264    
  
  Framerate : 30 frames per second    
  
  Size : 684.7 kB (6,84,673 bytes)
  
  Bitrates : 5458 kbps

  I have extracted frames from video

  ffmpeg -i f1.mp4 f%d.jpg

  All images are of 1920 x 1020 pixels by default 30 frames are generated (f7_1.jpg, f7_2.jpg,.....,f7_30.jpg)

  I have added some texts and objects to these images (without changing dimensions of any image, all 30 images are still of 1920 x 1020 pixels)

  Now I am trying to merge all these images to create single video (of 1 second)

  I referred this official document, I have run below command

  ffmpeg -f image2 -i f7_%d.jpg -r 30 -b:v 5458k foo_5458_2.mp4

  Video created is also of one second, thing is its bit rates are higher then the original one. New video has 6091 kbps bit rates, while I expect are 5458 kbps only.

  Because of higher bits, its gets finish very quickly compare to original video in video player.

  Is there any thing I missing ??

  And I don’t know what is exact meaning and job of -f image2 option, when I run command without this option, I am getting same video.

• How to select compile parameter with custom need？

  19 février 2019, par Shucheng

  I need to compile a static FFmpeg on macOS and add this build to a Xcode project. If I download a full version from official website that is work. But this version size is huge, and I just need a few format to convert. So I need to compile by myself.

  I’ve tired to compile and it’s worked. But I am not sure how to select compile parameter.

  For instance, I need to convert : ogg,flac,opus,webm files to mp3 file with the minimum size. And my compile parameter :

    ./configure --enable-ffmpeg --enable-small  --enable-static --enable-protocol=file,http,https --enable-libvorbis \
  
    --enable-libopus --disable-ffplay --disable-ffprobe --enable-demuxer=mp3,mp4,webm_dash_manifest,opus,flac,ogg \
  
    --enable-decoder=mp3*,vp*,mpeg4*,opus,flac --enable-libmp3lame  --disable-autodetect --disable-network --enable-pthreads

  But it seems not to work, I can’t convert files. Error reason is dyld: Library not loaded: /usr/local/opt/lame/lib/libmp3lame.0.dylib.But I used parameter --enable-static.

  So what should I do ? If I need to support a format to convert, I need to care about which respect ? Thanks