Recherche avancée

Sur d’autres sites (12690)

• Swift framework project with internal C module - Undefined symbols for architecture arm64

  29 mars 2020, par Phạm Phi Phúc

  I’m creating Swift framework project using FFmpeg module internally.

  Steps are :

  1. Download source of FFmpeg from official website.
  2. Build it by build script here : https://github.com/kewlbear/FFmpeg-iOS-build-script
  3. Copy built file to project
  4. Create file module.modulemap, it’s content is :

  module FFmpeg [system][extern_c] {
  
  
  
      header "include/libavcodec/avcodec.h"
  
      header "include/libavdevice/avdevice.h"
  
      header "include/libavfilter/avfilter.h"
  
      header "include/libavformat/avformat.h"
  
      header "include/libavutil/avutil.h"
  
      header "include/libswresample/swresample.h"
  
      header "include/libswscale/swscale.h"
  
  
  
      export *
  
  }

  Project tree is :

  

  5. Set Import paths for both project settings and target settings to
     $(SRCROOT)/MediaToolkit/Libraries/FFmpeg/**
  6. My source code is :

  import Foundation
  
  import FFmpeg
  
  
  
  public class MediaToolkit {
  
      public init(){}
  
  
  
      public func hello() {
  
          print("AVFMT_NOFILE: \(AVFMT_NOFILE)")
  
          avformat_network_init()
  
      }
  
  }

  When I build it, I received error

  Undefined symbols for architecture arm64:
  
    "_avformat_network_init", referenced from:
  
        MediaToolkit.MediaToolkit.hello(Swift.String) -> () in MediaToolkit.o
  
  ld: symbol(s) not found for architecture arm64
  
  clang: error: linker command failed with exit code 1 (use -v to see invocation)

  If I remove line avformat_network_init(), it will print AVFMT_NOFILE: 1

• ffmpeg - avformat_alloc_context error in linker - ld : symbol(s) not found for architecture x86_64 - building on Mac [duplicate]

  29 septembre 2020, par QRrabbit

  I'm writing my first program - attempt at avformat libraries inside my C++ code. Linker errors on this line :

  


      AVFormatContext* av_format_ctx = avformat_alloc_context();


  


  The error appears as such:
Undefined symbols for architecture x86_64:
  "_avformat_alloc_context", referenced from:
      load_frame(char const*, int*, int*, unsigned char**) in load_frame.cpp.o
  "_avformat_open_input", referenced from:
      load_frame(char const*, int*, int*, unsigned char**) in load_frame.cpp.o
ld: symbol(s) not found for architecture x86_64


  


  Almost feels like I have some conflicting libraries, but I don't know how to isolate the right one. Any help is greatly appreciated.

  


• [h264_nvenc : InitializeEncoder failed:supported only with separate color plane on this architecture

  4 janvier 2021, par gpuguy

  I am learning ffmpeg for the first time. What I want is to see how it performs on CPU and on GPU when it comes to transcoding.

  


  My machine is having a GT640 GPU card (GT640 is a Kepler card) and I am running a windows 7 , 64bit.
I issue the following command :

  


  ffmpeg -i lec_2.mp4 -c:v h264_nvenc -profile high444p -pixel_format yuv444p -preset default output.mp4


  


  But I am getting following errors :

  


  [h264_nvenc @ 0000000000363a80] The selected preset is deprecated. Use p1 to p7
+ -tune or fast/medium/slow.
[h264_nvenc @ 0000000000363a80] InitializeEncoder failed: invalid param (8): 444
 is supported only with separate color plane on this architecture.
Error initializing output stream 0:0 -- Error while opening encoder for output s
tream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
[aac @ 0000000000365980] Qavg: 18941.322
[aac @ 0000000000365980] 2 frames left in the queue on closing
Conversion failed!


  


  My questions are :

  


  


  1. From this output can I assume that nvenc is supported on my card since it does not complaint of no nvenc supported GPU ?

     


  


  2. How should the above command be modified so as to make it work correctly