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• 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

• How to configure rtsp relay from internal to external network ?

  27 mars 2020, par Magi

  How to correctly compose a command for relaying a video stream to rtsp from an ip camera from an internal network through a server with vlc.

  Ip-camera -> ubuntu server -> client with vlc

  Url video-stream from ip-camera rtsp ://admin:admin123@10.148.21.190:554/cam/realmonitor ?channel=1&subtype=0&unicast=true&proto=Onvif

  Command on server :

  cvlc -d rtsp://admin:admin@10.148.21.190:554/cam/realmonitor?channel=1&subtype=0&unicast=true&proto=Onvif --loop --repeat --sout-keep "#rtp{sdp=rtsp://xxx.xxx.xxx.xxx:8080/test.sdp}";

  xxx.xxx.xxx.xxx - external server ip.

  On vlc enter rtsp ://xxx.xxx.xxx.xxx:8080/test.sdp - broadcast is not going. There are no errors, the log is empty.

  With ffmpeg :

  ffmpeg -i 'rtsp://onvif:admin2017@10.148.21.190:554/cam/realmonitor?channel=1&subtype=0&unicast=true&proto=Onvif' -f rtsp -rtsp_transport tcp rtsp://xxx.xxx.xxx.xxx;
  
  Input #0, rtsp, from 'rtsp://onvif:admin2017@10.148.21.190:554/cam/realmonitor?channel=1&subtype=0&unicast=true&proto=Onvif':
  
    Metadata:
  
      title           : Media Server
  
    Duration: N/A, start: 0.320000, bitrate: N/A
  
      Stream #0:0: Video: h264 (High), yuvj420p(pc, bt709, progressive), 1280x720, 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:1: Data: none
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> mpeg4 (native))
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 0x55ae26500a80] deprecated pixel format used, make sure you did set range correctly
  
  [tcp @ 0x55ae26aa3ec0] Connection to tcp://xxx.xxx.xxx.xxx:554?timeout=0 failed: Connection refused
  
  Could not write header for output file #0 (incorrect codec parameters ?): Connection refused
  
  Error initializing output stream 0:0 --
  
  Conversion failed!

  In /etc/ffserver.conf ACL allow localhost xxx.xxx.xxx.xxx

• avformat/avio : move ff_rename implementation from internal.h to avio.c

  8 janvier 2020, par Marton Balint

  avformat/avio : move ff_rename implementation from internal.h to avio.c
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavformat/avio.c
  • [DH] libavformat/internal.h