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• Using ffmpeg with C++ : Undefined symbols for architecture x86_64

  31 mars 2017, par JavaRunner

  I’m dealing with one example of FFMPEG called is "muxing.c".

  So I tried to compile that file with two Makefiles. The first one is for C-language :

  FFMPEG_LIBS=    libavdevice                        \
  
                  libavformat                        \
  
                  libavfilter                        \
  
                  libavcodec                         \
  
                  libswresample                      \
  
                  libswscale                         \
  
                  libavutil                          \
  
  
  
  CFLAGS := -Wall -g $(shell pkg-config --cflags $(FFMPEG_LIBS)) $(CFLAGS)
  
  LDLIBS := $(shell pkg-config --libs $(FFMPEG_LIBS)) -lm $(LDLIBS)
  
  
  
  SOURCES=        muxing                             \
  
  
  
  OBJS=$(addsuffix .o,$(SOURCES))
  
  
  
  all: $(OBJS) $(SOURCES)

  That makefile compiles well. But if I trying to move this code to C++ : I rename muxing.c to muxing.cpp and use this Makefile :

  CC=g++
  
  
  
  FFMPEG_LIBS=    libavdevice                        \
  
                  libavformat                        \
  
                  libavfilter                        \
  
                  libavcodec                         \
  
                  libswresample                      \
  
                  libswscale                         \
  
                  libavutil                          \
  
  
  
  CPPFLAGS := -Wall -g $(shell pkg-config --cflags $(FFMPEG_LIBS)) $(CPPFLAGS)
  
  LDLIBS := $(shell pkg-config --libs $(FFMPEG_LIBS)) -lm $(LDLIBS)
  
  
  
  SOURCES=        muxing                             \
  
  
  
  OBJS=$(addsuffix .o,$(SOURCES))
  
  
  
  all: $(OBJS) $(SOURCES)

  I get a bunch of error like this :

  $ g++   muxing.o  -L/usr/local/Cellar/ffmpeg/3.2.4/lib -lavdevice -lavformat -lavfilter -lavcodec -lswresample -lswscale -lavutil  -lm -o muxing
  
  Undefined symbols for architecture x86_64:
  
    "av_dict_set(AVDictionary**, char const*, char const*, int)", referenced from:
  
        _main in muxing.o
  
    "av_strerror(int, char*, unsigned long)", referenced from:
  
        av_make_error_string(char*, unsigned long, int) in muxing.o
  
    "avio_closep(AVIOContext**)", referenced from:
  
        _main in muxing.o
  
    "swr_convert(SwrContext*, unsigned char**, int, unsigned char const**, int)", referenced from:
  
        write_audio_frame(AVFormatContext*, OutputStream*) in muxing.o
  
    "av_dict_copy(AVDictionary**, AVDictionary const*, int)", referenced from:
  
        open_video(AVFormatContext*, AVCodec*, OutputStream*, AVDictionary*) in muxing.o
  
        open_audio(AVFormatContext*, AVCodec*, OutputStream*, AVDictionary*) in muxing.o
  
    "av_dict_free(AVDictionary**)", referenced from:
  
        open_video(AVFormatContext*, AVCodec*, OutputStream*, AVDictionary*) in muxing.o
  
        open_audio(AVFormatContext*, AVCodec*, OutputStream*, AVDictionary*) in muxing.o
  
    "av_rescale_q(long long, AVRational, AVRational)", referenced from:
  
        write_audio_frame(AVFormatContext*, OutputStream*) in muxing.o
  
    "av_compare_ts(long long, AVRational, long long, AVRational)", referenced from:
  
        _main in muxing.o
  
        get_video_frame(OutputStream*) in muxing.o
  
        get_audio_frame(OutputStream*) in muxing.o

  Is that mean those libs are not ready to work with x64 ? I strongly need to mix that code (muxing.c) with my C++ code because I have to render a video on the fly using ImageMagick (my code was written with C++) for the frames.

  How can I mix C++ and C in this case ?

  My env is : OS X 10.12.3

• ffmpeg multiple input video in grid and simultaneous audio

  13 février 2023, par Hnusny Pleb

  i would like to copy a video into n videos in one grid :
best example : https://www.youtube.com/watch?v=lYKDTLGH-TQ&ab_channel=TheRabbit_123

  


  This is my code, its working, but problem is, the audio seems to be like its played by one version.. I want the "echo" thats created by a lot of files like on the video above.

  


  def create_4_in_one(number):
shutil.copy("start.mp4", f"video.mp4")
for i in range(number):
    shutil.copy("video.mp4", f"temp_videa/{i}.mp4")
    subprocess.call(f'ffmpeg -y -i video.mp4 -vf "scale=iw/2:ih/2" -c:a copy video_half.mp4',
                  shell=True)
    subprocess.call(f'ffmpeg -y -i video_half.mp4 -i video_half.mp4 -i video_half.mp4 -i video_half.mp4 -filter_complex "[0:v][1:v]hstack[t];[2:v][3:v]hstack[b];[t][b]vstack[v]; [0:a][1:a][2:a][3:a]amerge=inputs=4[a]" -map "[v]" -map "[a]" -map 0:a -map 1:a -map 2:a -map 3:a -c:a aac -b:a 128k -ac 2 -shortest output.mp4',
                  shell=True)
    os.remove("video.mp4")
    os.remove("video_half.mp4")
    os.rename('output.mp4', 'video.mp4')

os.remove("video.mp4")


  


  Thanks in advance.

  


• Publish local .mp4 video from android to wowza using FFmpeg

  13 mars 2016, par Parth Doshi

  I am trying to publish a local .mp4 video from my sdcard to wowza using the ffmpeg java wrapper.

  I have used the library for executing ffmpeg commands on Android

  On Android, my code looks as follows :

  FfmpegController objController = new FfmpegController(MainActivity.this, new File("/tmp"));
  
                  //objController.installBinaries(MainActivity.this,true);
  
                  mFfmpegBin = objController.installBinary(MainActivity.this, R.raw.ffmpeg, "ffmpeg", true);
  
                  //no just extract the audio
  
                  ArrayList<string> cmd = new ArrayList<string>();
  
  
  
                  //-f dshow -i video="Integrated Camera" out.mp4
  
                  cmd.add(mFfmpegBin);
  
                  //cmd.add("-sample_fmts");
  
                  cmd.add("-re");
  
                  cmd.add("-i");      
  
                  cmd.add("/sdcard/sample.mp4");
  
                  cmd.add("-c");
  
                  cmd.add("copy");
  
                  cmd.add("-f");
  
                  cmd.add("flv");
  
                  cmd.add("rtsp://192.168.1.35:1936/live/myStream");
  
  
  
                  objController.execFFMPEG(cmd, new ShellUtils.ShellCallback() {
  
  
  
                      @Override
  
                      public void shellOut(String shellLine) {
  
                          // TODO Auto-generated method stub
  
                          System.out.println("shell out" + " "  +shellLine);
  
                      }
  
  
  
                      @Override
  
                      public void processComplete(int exitValue) {
  
                          // TODO Auto-generated method stub
  
                          System.out.println("process complete::" + " " +exitValue);
  
  
  
                      }
  
                  });
  
  
  
              }catch(Exception ex){
  
                  ex.printStackTrace();
  
              }
  
          }
  
  </string></string>

  Now, when I execute the command, I get the following logs

  shell out Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/sdcard/sample.mp4':
  
  shell out rtmp://192.168.1.35:1936/live/myStream: Protocol not found

  Why is the protocol not supported on Android. When I run the same ffmpeg command from windows command line using ffmpeg then it works fine.

  The command is,

  ffmpeg -re -i sample.mp4 -c copy -f flv rtmp ://192.168.1.35:1936/live/myStream

  Can please someone help ?