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• FFmpeg - concat videos error, do not match the corresponding output link ?

  18 février 2021, par wensefu

  I'm trying to concat some video into one single video using ffmpeg.

  



  input information :

  



  a.mp4 1920x808 , b.mkv 1280x720

  



  First I tried command below and it works fine :

  



  


  ffmpeg -i a.mp4 -i b.mkv -f lavfi -t 0.1 -i anullsrc -filter_complex [1:v]scale=1920:808:force_original_aspect_ratio=decrease,pad=1920:808 :(ow-iw)/2 :(oh-ih)/2[v1] ; [0:v][0:a][v1][1:a]concat=n=2:v=1:a=1[outv][outa] -map [outv] -map [outa] -vcodec libx264 -crf 27 -preset ultrafast -threads 2 out.mp4

  


  



  And then I put 'b.mkv' first :

  



  


  ffmpeg -i b.mkv -i a.mp4 -f lavfi -t 0.1 -i anullsrc -filter_complex [0:v]scale=1920:808:force_original_aspect_ratio=decrease,pad=1920:808 :(ow-iw)/2 :(oh-ih)/2[v0] ; [v0][0:a][1:v][1:a]concat=n=2:v=1:a=1[outv][outa] -map [outv] -map [outa] -vcodec libx264 -crf 27 -preset ultrafast -threads 2 out.mp4

  


  



  but this time I got error :

  



  


  Input link in1:v0 parameters (size 1920x808, SAR 0:1) do not match the corresponding output link in0:v0 parameters (1920x808, SAR 3232:3231)

  


  



  I don't understand why ?

  



  Any ideas anyone ?

  



  Many thanks in advance.

  


• Specifying correct library to link in Xcode when multiple copies exist on search path

  23 avril 2015, par Robotbugs

  I am trying to compile a C++ file that depends on ffmpeg. I have spent a long time trying to fix all the link errors. I found that on the Mac it needs :

  libbz2.dylib
  
  libiconv.dylib
  
  libz.dylib
  
  libavcodec.a
  
  libavformat.a
  
  libswscale.a
  
  libswresample.a
  
  VideoDecodeAcceleration.framework
  
  CodeVideo.framework
  
  CoreFoundation.framework

  The problem I have is that I still get symbol link errors for libiconv even though the library is present in /usr/lib and all the other libraries in this directory are being found there. The compile line includes -liconv.2

  On searching around I found that the problem comes from there being two version of libiconv on my system. One is in /usr/lib and the other is in /opt/local/lib. The one in /usr/lib exports symbols that ffmpeg uses named like "_iconv_open", whereas the one in /opt/local/lib exports the same symbols with "lib" added, e.g. "_libiconv_open". It seems the compiler is picking up the /opt/local/lib library.

  How can I get Xcode to pick up the correct lib ?

• Link ffmpeg to Pydub in Serverless layer

  15 mars 2021, par akai

  I'm using the Serverless framework to deploy an app on AWS. I have created a layer, defined as follows in serverless.yml :

  


  layers:
  ffmpeg:
    path: layer


  


  I also excluded it from the main file bundle :

  


  package:
  exclude:
    - layer/**


  


  and defined a lambda function :

  


   cut_audio:
    layers:
      - {Ref: FfmpegLambdaLayer}


  


  In this function I use the Pydub library, which needs to access the ffmpeg layer. At the moment I have the following error FileNotFoundError: [Errno 2] No such file or directory: 'ffprobe', meaning I have to link ffmpeg as AudioSegment.converter(path)

  


  How do I get the path of my layer ?

  


  Edit : could I solve this by bundling both Pydub and ffmpeg in the layer ?

  


  Edit 2 : the eziotedeschi/AWS-Lambda-Layer-Pydub github repository doesn't seem to help. I get the following error No module named 'pydub'. I am using Python3.8 as runtime, that might be the issue.