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• Undefined symbols av_register_all()

  15 septembre 2015, par user3249421

  Good day,

  I am beninger in Objective-C and Xcode IDE. I am trying use ffmpeg in my iOS application. I cloned https://github.com/kewlbear/FFmpeg-iOS-build-script and build for arm64 and x86_64.

  When I want to build app it crashed with

  Ld /Users/nikolajpognerebko/Library/Developer/Xcode/DerivedData/CPP3-eowdhpsbeagmxydsrsscofhtuwtl/Build/Products/Debug-iphonesimulator/CPP3.app/CPP3 normal x86_64
  
  cd /Volumes/sedy/xcode/CPP3
  
  export IPHONEOS_DEPLOYMENT_TARGET=9.1
  
  export PATH="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin"
  
  /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.1.sdk -L/Users/nikolajpognerebko/Library/Developer/Xcode/DerivedData/CPP3-eowdhpsbeagmxydsrsscofhtuwtl/Build/Products/Debug-iphonesimulator -L/Volumes/sedy/xcode/CPP3/CPP3/ffmpeg/lib -F/Users/nikolajpognerebko/Library/Developer/Xcode/DerivedData/CPP3-eowdhpsbeagmxydsrsscofhtuwtl/Build/Products/Debug-iphonesimulator -filelist /Users/nikolajpognerebko/Library/Developer/Xcode/DerivedData/CPP3-eowdhpsbeagmxydsrsscofhtuwtl/Build/Intermediates/CPP3.build/Debug-iphonesimulator/CPP3.build/Objects-normal/x86_64/CPP3.LinkFileList -Xlinker -rpath -Xlinker @executable_path/Frameworks -mios-simulator-version-min=9.1 -Xlinker -objc_abi_version -Xlinker 2 -stdlib=libc++ -fobjc-arc -fobjc-link-runtime -lavcodec -lavdevice -lavfilter -lavformat -lavutil -lswresample -lswscale -framework AVFoundation -liconv -lbz2 -Xlinker -dependency_info -Xlinker /Users/nikolajpognerebko/Library/Developer/Xcode/DerivedData/CPP3-eowdhpsbeagmxydsrsscofhtuwtl/Build/Intermediates/CPP3.build/Debug-iphonesimulator/CPP3.build/Objects-normal/x86_64/CPP3_dependency_info.dat -o /Users/nikolajpognerebko/Library/Developer/Xcode/DerivedData/CPP3-eowdhpsbeagmxydsrsscofhtuwtl/Build/Products/Debug-iphonesimulator/CPP3.app/CPP3
  
  
  
  Undefined symbols for architecture x86_64:
  
    "av_register_all()", referenced from:
  
        Decoder::Decoder() in ViewController.o
  
  ld: symbol(s) not found for architecture x86_64
  
  clang: error: linker command failed with exit code 1 (use -v to see invocation)

  There is zipped all project on OneDrive http://1drv.ms/1KkPAia because it is a best way to explain my problem.

  Please help me and explain, what this problem arose.

  Thanks very much.

• ffmpeg gives error DTS out of order and Non-monotonous DTS in output stream [migrated]

  16 août 2015, par tmoore82

  I’m trying to concatenate multiple mp4 videos into one using ffmpeg. The "how to" for this is mostly identical across the web :

  ffmpeg -f concat -i inputfile.txt -c copy output.mp4

  But when I try to concatenate my files, I keep getting output like the following :

  [concat @ 0x1f72560] DTS 3815 < 3812809 out of order
  
  [mp4 @ 0x20ad2e0] Non-monotonous DTS in output stream 0:0; previous: 3812809, current: 3815; changing to 3812810. This may result in incorrect timestamps in the output file.

  The result is that I have a file where the audio and video work for the first segment, but only the audio works for subsequent segments. Occasionally, I’ll get a video with no audio.

  Some users switch to MP4Box, but I’ve tried MP4Box with the same results. What am I missing ? I saw this post that says -c copy is the problem, but I don’t really follow what it’s saying about reencoding or why that’s necessary.

  Command :

  ffmpeg -f concat -i test.txt -c copy test.mp4 &> result.txt

  Contents of test.txt

  file '/raw/01 - Introduction.mp4'
  
  file '/raw/02 - Background Material.mp4'

  Contents of result.txt : http://paste.ubuntu.com/12101801/

• Playing audio in a Mac App Store compatible NWJS app

  13 août 2015, par James Newton

  In the Additional Steps section at the foot of MAS : Packaging your app, I read :

  To ensure proper validation [of your NWJS app for the Mac App Store], you have to check those steps :

  Delete the FFMPEG library :

  rm "YourApp.app/Contents/Frameworks/nwjs
 Framework.framework/Libraries/ffmpegsumo.so"

  Note : Currently, FFMPEG library cannot be submitted to Mac App Store as is.

  When I delete the FFMPEG library, if my app includes (ogg) audio files and attempts to play them, the app crashes. I assume that this is because the FFMPEG library is essential for audio playback.

  Does this mean that the current Mac-App-Store-friendly NWJS build (nwjs-macappstore-v0.12.3-osx-x64) does not support audio ? Or is the an alternative audio library that I can use with it ?