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• Draw FFmpeg AVFrame data with OpenGL with Go

  27 avril 2018, par nevernew

  I’m making a video player in Go (on Windows) using FFmpeg and OpenGl, with the go wrappers goav and go-gl respectively. I want to set the pixels (stored in AVFrame->data) as a texture to display with OpenGL.

  I have it drawing pixels from a test array I created in Go, but it’s not taking the AVFrame data at all. The gl wrapper is giving me an error panic: reflect: call of reflect.Value.Pointer on uintptr Value with this code, I’ve tried different ways, trying to cast the data to the right type to be accepted but to no avail.

  This is the offending code where f is of type *Frame :

  type Frame C.struct_AVFrame
  
  
  
  dataPtr := (*uint8)(unsafe.Pointer((*C.uint8_t)(unsafe.Pointer(&f.data))))
  
  dataAddr := uintptr(unsafe.Pointer(dataPtr))
  
  
  
  glPixelPointer := gl.Ptr(dataAddr) // reflect error happens here, so the pointer is wrong

  Trying to get the data from this C struct :

  #include 
  
  
  
  typedef struct AVFrame {
  
  #define AV_NUM_DATA_POINTERS 8
  
      uint8_t *data[AV_NUM_DATA_POINTERS];
  
  }

  I can provide the rest of the code if needed, but there’s a lot of it to get the example running.

• How to make ffmpeg configure add to the end of compiling line ?

  28 octobre 2012, par myWallJSON

  I want to make ffmpeg not to use -fno-math-errno on compilation.

  I tried ./configure --extra-cflags="-fmath-errno"

  but it ads it before ffmpegs -fno-math-errno :

  gcc -I. -I./ -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DHAVE_AV_CONFIG_H   -std=c99 -fomit-frame-pointer -I/cygdrive/c/Users/Avesta/Downloads/FlasCC_1.0.1121790_10-08-2012/sdk/usr/include/SDL -D_GNU_SOURCE=1 -Wdeclaration-after-statement -Wall -Wno-parentheses -Wno-switch -Wno-format-zero-length -Wdisabled-optimization -Wpointer-arith -Wredundant-decls -Wno-pointer-sign -Wwrite-strings -Wundef -Wmissing-prototypes -Wno-pointer-to-int-cast -Wstrict-prototypes -O3  -mllvm -stack-alignment=16  -MMD -MF libavformat/allformats.d -MT libavformat/allformats.o -c -o libavformat/allformats.o libavformat/allformats.c

  \so I wonder how to make configure to add flags after all -f including -fno-math-errno ?

  there are :

    --extra-cflags=ECFLAGS   add ECFLAGS to CFLAGS []
  
    --extra-cxxflags=ECFLAGS add ECFLAGS to CXXFLAGS []
  
    --extra-ldflags=ELDFLAGS add ELDFLAGS to LDFLAGS []
  
    --extra-libs=ELIBS       add ELIBS []
  
    --extra-version=STRING   version string suffix []

• FFMpeg kills itself when restreaming http to rtmp

  22 novembre 2019, par dust19992

  We are trying to restream few stations to our Emby server (alternative to plex), but always when we start the command as provided by many cast-software it runs for some time and then it dies.

  Here is our command :

  ffmpeg -i http://URL/IP:1515/station/discoverychannel/15HD -c:a aac -b:a 96k -ar 44100 -vcodec copy -f flv rtmp://server/discoverystation/15HD

  The error is none the only exit message is :

    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  frame=33056 fps= 60 q=-1.0 Lsize=  302387kB time=00:09:11.45 bitrate=4492.0kbits/s speed=1.01x
  
  video:295223kB audio:6576kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.194924%
  
  [aac @ 0x55b6a748ee40] Qavg: 583.684
  
  Exiting normally, received signal 2 
  
  root@simpsons:~#```
  
  
  
  
  
  Our server is WOWZA media server, and we have been looking for the problem for some time now, but without any success, so we hope you guys can help us figure it out, we are trying to copy the live video as it is, and we do not want to change the encoding, or anything else, but if necessary then it has to be encoded.
  
  
  
  I have not much experience in ffmpeg but we have been using VMIX that uses ffmpeg and it's running smooth there to the server without dying, so there has to be a way to run that with the ffmpeg standalone. 
  
  
  
  Here is the WOWZA restream manual: https://www.wowza.com/docs/how-to-restream-using-ffmpeg-with-wowza-streaming-engine
  
  
  
  Thanks.