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• Why does ffmpeg report different durations ?

  18 mai 2012, par kenitech

  Source videos : http://www.artworknotavailable.com/tmp/ffmpegtest

  Quicktime Pro 7.7.1 Inspector (Win 7) reports the following for the file 2398.mov

  4.19MB
  H.264
  Movie FPS : 23.98
  Data Rate : 2.35 mbits/Sec
  Duration 14:97
  

  ffmpeg reports the following (see full ffmpeg version info at bottom of post)

  ffmpeg -i 2398.mov

  Seems stream 1 codec frame rate differs from container frame rate : 47952.00 (47952/1) -> >23.98 (2997/125)
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '2398.mov' :
  Metadata :
  major_brand : qt
  

  minor_version : 537199360
  compatible_brands : qt
  Duration : 00:00:15.97, start : 0.-963005, bitrate : 2210 kb/s
  Stream #0.0(eng) : Audio : aac, 48000 Hz, stereo, s16, 152 kb/s
  Stream #0.1(eng) : Video : h264, yuv420p, 848x480, 2060 kb/s, 23.98 fps, 23.98 tbr, 23976 tbn, 47952 tbc
  

  One second longer than what Quicktime reports.

  As an experiment I exported this file from Quicktime Pro using the following settings :

  Frame Rate : Current
  Key Frames : Every 24 frames
  Frame Reordering On
  Quality : High
  Encoding Best
  Data Rate : Automatic
  Optimized for Download
  Output file : qtime-export-2398.mov

  Quicktime Inspector reports :

  5.62 MB
  H.264
  Movie FPS : 23.98
  Data Rate : 3.15 mbits/Sec
  Duration 14:97
  

  ffmpeg now reports :

  ffmpeg -i qtime-export-2398.mov

  Seems stream 1 codec frame rate differs from container frame rate : 1200.00 (1200/1) -> 23.98 (24000/1001)
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'qtime-export-2398.mov' :
  Metadata :
  major_brand : qt
  minor_version : 537199360
  compatible_brands : qt
  Duration : 00:00:14.96, start : 0.000000, bitrate : 3153 kb/s
  Stream #0.0(eng) : Audio : pcm_s16le, 44100 Hz, 2 channels, s16, 1411 kb/s
  Stream #0.1(eng) : Video : h264, yuv420p, 678x384, 1738 kb/s, 23.98 fps, 23.98 tbr, 600 tbn, 1200 tbc
  

  ffmpeg's report on duration went from 15.97 to 14.96 (I can live with .1)

  Is this duration calculated from the bitrate ?

  I need to accurately report the duration of uploaded videos as well as convert them to FLV. Can somebody tell me what is going on here and how I might get around this ?

  ffmpeg info below. I've tried this on 2 completely different installs/versions of ffmpeg. Same result.

  FFmpeg version 0.6.5, Copyright (c) 2000-2010 the FFmpeg developers
  built on Jan 29 2012 23:55:02 with gcc 4.1.2 20080704 (Red Hat 4.1.2-51)
  configuration : —prefix=/usr —libdir=/usr/lib64 —shlibdir=/usr/lib64 —mandir=/usr/share/man —incdir=/usr/include —disable-avisynth —extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector —param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' —enable-avfilter —enable-avfilter-lavf —enable-libdirac —enable-libfaac —enable-libfaad —enable-libfaadbin —enable-libgsm —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libx264 —enable-gpl —enable-nonfree —enable-postproc —enable-pthreads —enable-shared —enable-swscale —enable-vdpau —enable-version3 —enable-x11grab
  libavutil 50.15. 1 / 50.15. 1
  libavcodec 52.72. 2 / 52.72. 2
  libavformat 52.64. 2 / 52.64. 2
  libavdevice 52. 2. 0 / 52. 2. 0
  libavfilter 1.19. 0 / 1.19. 0
  libswscale 0.11. 0 / 0.11. 0
  libpostproc 51. 2. 0 / 51. 2. 0
  FFmpeg 0.6.5
  libavutil 50.15. 1 / 50.15. 1
  libavcodec 52.72. 2 / 52.72. 2
  libavformat 52.64. 2 / 52.64. 2
  libavdevice 52. 2. 0 / 52. 2. 0
  libavfilter 1.19. 0 / 1.19. 0
  libswscale 0.11. 0 / 0.11. 0
  libpostproc 51. 2. 0 / 51. 2. 0

• 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)

• FFMPEG - Merge mp4 files and audio file

  4 octobre 2016, par Jon Stevens

  I have an ffmpeg that merges 3 mp4 videos and then another command that adds audio to the output file from the first command. The commands are as follows :

  ffmpeg -i vid-1.mp4 -i vid-2.mp4 -i vid-3.mp4 -filter_complex "[0:v][1:v][2:v]concat=n=3:v=1" -preset ultrafast -crf 1 output.mp4
  
  
  
  ffmpeg -i output.mp4 -i audio.mp3 -preset ultrafast -crf 1 final.mp4

  • vid-1.mp4 (does NOT have audio stream)
  • vid-2.mp4 (does NOT have audio stream)

  Is there anyway to do this in one command ? I would like to also add the audio to the video that is getting created in the first command. Is this possible ?

  Console output of "ffmpeg -i vid-1.mp4 -i vid-2.mp4 -i vid-3.mp4 -i audio.mp3"

  [jstevens@jr testing]$ ffmpeg -i vid-1.mp4 -i vid-2.mp4 -i vid-3.mp4 -i audio.mp3
  
  ffmpeg version 3.0.2 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 6.1.1 (GCC) 20160510 (Red Hat 6.1.1-2)
  
    configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-frei0r --enable-gnutls --enable-ladspa --enable-libass --enable-libcdio --enable-libdc1394 --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopencv --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
  
    libavutil      55. 17.103 / 55. 17.103
  
    libavcodec     57. 24.102 / 57. 24.102
  
    libavformat    57. 25.100 / 57. 25.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 31.100 /  6. 31.100
  
    libavresample   3.  0.  0 /  3.  0.  0
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'vid-1.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.25.101
  
    Duration: 00:00:05.00, start: 0.000000, bitrate: 1085 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1081 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'vid-2.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.25.101
  
    Duration: 00:00:05.00, start: 0.000000, bitrate: 1018 kb/s
  
      Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1014 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'vid-3.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.25.101
  
    Duration: 00:00:05.00, start: 0.000000, bitrate: 823 kb/s
  
      Stream #2:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 819 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  [mp3 @ 0x1ca30c0] Skipping 0 bytes of junk at 0.
  
  [mp3 @ 0x1ca30c0] Estimating duration from bitrate, this may be inaccurate
  
  Input #3, mp3, from 'audio.mp3':
  
    Duration: 00:00:19.57, start: 0.000000, bitrate: 64 kb/s
  
      Stream #3:0: Audio: mp3, 44100 Hz, mono, s16p, 64 kb/s
  
  At least one output file must be specified