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• fatal error：libavcodec/avcodec.h No such file or directory

  23 avril 2018, par Colin0114

  I tried debug ffmpeg on my ubuntu1604 platform, but it always says that it cannot find the headfiles, but actually I did include headfiles in my compiling code.

  here is the error message：
  error message

  here is my test code :

   #include 
  
   #include "libavcodec/avcodec.h"
  
   #include "libavformat/avformat.h"
  
   #include "libswscale/swscale.h"
  
  
  
  int main(int argc, char * argv[]){
  
  av_register_all();
  
  AVFormatContext *pFormatCtx = NULL;
  
  
  
  // Open video file
  
  if (avformat_open_input(&pFormatCtx, argv[1], NULL, NULL) !=0 )
  
      return -1; // Couldn't open file
  
  
  
  // Retrieve stream information
  
  if (avformat_find_stream_info(pFormatCtx, NULL) < 0)
  
      return -1; // Couldn't find stream information
  
  
  
  // Dump information about file onto standard error
  
  av_dump_format(pFormatCtx, 0, argv[1], 0);
  
  
  
  int i;
  
  AVCodecContext *pCodecCtxOrig = NULL;
  
  AVCodecContext *pCodecCtx = NULL;
  
  
  
  // Find the first video stream
  
  int videoStream = -1;
  
  for(i=0; inb_streams; i++)
  
      if (pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO){
  
          videoStream = 1;
  
          break;
  
      }
  
  
  
  if (videoStream == -1)
  
      return -1; // Didn't find a video stream
  
  
  
  // Get a pointer to the codec context for the video stream
  
  pCodecCtx = pFormatCtx->streams[videoStream]->codec;
  
  
  
  AVCodec *pCodec = NULL;
  
  // Find the decoder for the video stream
  
  pCodec = avcodec_find_decoder(pCodecCtx->codec_id);
  
  if (pCodec==NULL){
  
      fprintf(stderr, "Unsupported codec!\n");
  
      return -1; // Codec not found
  
  }   
  
  
  
  // Copy context
  
  pCodecCtx = avcodec_alloc_context3(pCodec);
  
  if (avcodec_copy_context(pCodecCtx, pCodecCtxOrig) !=0 ){
  
      fprintf(stderr, "Couldn't copy codec context");
  
      return -1; // Error copying codec context
  
  }
  
  
  
  // Open codec
  
  if (avcodec_open2(pCodecCtx, pCodec, NULL)<0)
  
      return -1; // Could not open codec
  
  
  
  AVFrame *pFrame = NULL;
  
  // Allocate video fream
  
  pFrame = av_frame_alloc();
  
  
  
  // Allocate an AVFrame structure
  
  AVFrame *pFrameRGB = NULL;
  
  pFrameRGB = av_frame_alloc();
  
  if(pFrameRGB == NULL)
  
      return -1;
  
  }

  and the following is my Makefile

  C++     = gcc
  
  INCLUDE_DIR = ./include
  
  LIB_DIR     = ./lib
  
  BIN_DIR     = ./build/bin
  
  TARGET      = $(BIN_DIR)/mk-screen-caps
  
  
  
  INC_PATH    += -I./ -I$(INCLUDE_DIR)
  
  LIBS        += -lstdc++ -lm -lgcc_s -lgcc -lc
  
  LIBS        += $(LIB_DIR)/libavcodec.a $(LIB_DIR)/libavdevice.a 
  
  $(LIB_DIR)/libavfilter.a 
  
  LIBS        += $(LIB_DIR)/libavformat.a $(LIB_DIR)/libavutil.a 
  
  $(LIB_DIR)/libfdk-aac.a 
  
  LIBS        += $(LIB_DIR)/libmp3lame.a $(LIB_DIR)/libopus.a 
  
  $(LIB_DIR)/libpostproc.a 
  
  LIBS        += $(LIB_DIR)/libswresample.a $(LIB_DIR)/libswscale.a 
  
  $(LIB_DIR)/libx264.a 
  
  LIBS        += $(LIB_DIR)/libx265.a $(LIB_DIR)/libyasm.a
  
  
  
  C++_FLAGS   += -pipe -g -Wall -o0 
  
  
  
  C_FILES     += $(wildcard ./*.c);
  
  CPP_FILES   += $(wildcard ./*.cpp)
  
  HEAD_FILES  += $(wildcard $(INCLUDE_DIR)/*.h)
  
  
  
  C_OBJS=$(C_FILES:.c=.o)
  
  CPP_OBJS=$(CPP_FILES:.cpp=.O)
  
  
  
  all: $(TARGET)
  
  $(TARGET): $(CPP_OBJS)
  
  $(C++)  $(C++_FLAGS) -o $@ $(CPP_FILES) $(LIBS)
  
  
  
  %.o: %.c $(HEAD_FILES)
  
      $(C++) -c $(C_FILES) $(INC_PATH) $< -o $@
  
  %.O: %.cpp $(HEAD_FILES)
  
      $(C++) -c $(CPP_FLAGS) $(INC_PATH) $< -o $@
  
  
  
  clean:
  
      rm -f $(TARGET) $(C_OBJS) $(CPP_OBJS)

  and the following is my directory information :

  mk-screen-caps (parent direcotry)

  —build

  —bin

  —include

  —(needed include files and directories)

  —lib

  —(needed libs)

• Changing size video with ffmpeg, but output freezes

  24 juillet 2017, par Psykomusic

  I’m looking for a way to reduce the size of a video using FFmpeg.
  In fact my input file is an RTP real time stream 1024*720 MPEG2TS/h264 30fps. I want record 1 min. of this stream every time I want, but the size of the video is like 30 MB with this command :

  ffmpeg -y  -i rtp://192.168.1.3:5368 -c copy -t 60  toto.mp4

  I tried to reduce quality to reduce size with this command :

  ffmpeg -y  -i rtp://192.168.1.3:5368 -c:v libx264 -crf 23  toto.mp4

  and lot of other lines, I added options for bitrate -b:v 200k, framerate -r 5 and orthers...

  But every time I have the same problem, the video output freezes after 6 sec.
  Which option I have to use ? Why my output is corrupted ?

  EDIT :
  I think the freeze is because of the hardware of my embeded device. I use a gstreamer pipeline instead of the ffmpeg line .

  gst-launch-1.0 -e udpsrc port=5368 caps="application/x-rtp name=source ! queue ! rtpmp2tdepay ! aiurdemux streaming_latency=400 name=d d. ! queue ! vpudec ! decodebin ! videorate ! "video/x-raw,framerate=5/1" ! vpuenc_h264  bitrate=0 ! flvmux ! filesink location=toto.flv

• Failed to build opencv for conda

  4 octobre 2016, par Caenorst

  I’m on Ubuntu 16.04 64 bits, using Anaconda2.

  I’m trying to install Opencv for conda with FFMPEG support (for VideoCapture).

  I followed this tutorial : http://dhaneshr.net/2016/06/03/installing-opencv-2-4-x-with-ffmpeg-python-on-anaconda/

  changed cmake to 3.3.1 and -DWITH_FFMPEG=1 but when I execute
  $ conda build conda

  It fails at the test to import cv2

  You can find the whole log in this file : https://gist.github.com/Caenorst/e6bce629178540f30818a66e2f3a8663