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• I want to create a video from images with transition applied

  29 mars 2023, par Kaleem Abbas

  I want to load images and create video with transition applied. I was able to create video but transitions are not being applied.

  


  ffmpeg -framerate 1/5 -start_number 1 -i "D :\video\photo\images%%d.jpg" -filter_complex "[0:v]split=5[0a][0b][0c][0d][0e] ;[0a]format=yuva420p,hflip[flip0] ;[0b]format=yuva420p[bg] ;[0c]format=yuva420p[bg1] ;[0d]format=yuva420p[bg2] ;[0e]format=yuva420p,hflip[flip1] ;[bg][flip0]overlay=x='min(-w*(t-1.5),0)':shortest=1[bg0] ;[bg0][bg1]overlay=x='min(-w*(t-0.5),0)':shortest=1,drawbox=t=fade:enable='between(t,0,1)':color=white[bg01] ;[bg01][flip1]overlay=x='min(-w*(t),0)':shortest=1,drawbox=t=fade:enable='between(t,0,1)':color=white[bg1] ;[bg1][bg2]overlay=x='min(-w*(t+0.5),0)':shortest=1,drawbox=t=fade:enable='between(t,0,1)':color=white[bg12] ;[bg12][1:v]overlay=shortest=1:x='if(gte(t,1),0,-w+(tw))':y=0,drawbox=t=fade:enable='between(t,0,1)':color=white[video]" -map "[video]" -c:v libx264 -crf 18 -preset veryfast -t 5 -vf "fade=t=out:st=4:d=1:alpha=1, wipe=w=0.5:h=0:y='H/2':x='if(gte(t,1),0,W-wt/2)':d=1" output.mp4

  


• Google Colab Runtime Error please install ffmpeg (version 4.2 is currently supported) andbuild torchvision from source

  4 juillet 2021, par Iman

  I'm using Google Colab to write a program using torch vision to extract frames from an mp4 video in my google drive. Thus far, I haven't wrote the full code yet but have been experimenting with torch vision.io library. Upon running the code, I get the following errors.

  


  Mounted at /content/gdrive&#xA;---------------------------------------------------------------------------&#xA;RuntimeError                              Traceback (most recent call last)&#xA; in <module>()&#xA;      6 &#xA;      7 video_path = "/content/drive/MyDrive/Training-Data-Videos/MASKED/00_MASKED_0_0.mp4"&#xA;----> 8 reader = torchvision.io.VideoReader(video_path, "video")&#xA;      9 reader.seek(2.0)&#xA;     10 frame = next(reader)&#xA;&#xA;/usr/local/lib/python3.7/dist-packages/torchvision/io/__init__.py in __init__(self, path, stream)&#xA;    106                 &#x2B; "to enable video_reader support, please install "&#xA;    107                 &#x2B; "ffmpeg (version 4.2 is currently supported) and"&#xA;--> 108                 &#x2B; "build torchvision from source."&#xA;    109             )&#xA;    110         self._c = torch.classes.torchvision.Video(path, stream)&#xA;&#xA;RuntimeError: Not compiled with video_reader support, to enable video_reader support, please install ffmpeg (version 4.2 is currently supported) andbuild torchvision from source.&#xA;&#xA;</module>

  


  The code that I have written in the notebook so far is the following :

  


  import os 
import torchvision 
from google.colab import drive
drive.mount('/content/gdrive', force_remount=True)

video_path = "/content/drive/MyDrive/Training-Data-Videos/MASKED/00_MASKED_0_0.mp4"
reader = torchvision.io.VideoReader(video_path, "video")
reader.seek(2.0)
frame = next(reader)
print (frame)



  


  To solve the problem, I tried to install ffmpeg on colab as this post says but it did not work. Can someone tell me what is the error ?

  


• Ffmpeg linking problems using CMake

  7 décembre 2013, par Zoellick

  I'm writing an application containig 2 internal libraries and depends on more 2 external libraries (ffmpeg and opencv). I'm also using CMake to produce UNIX makefiles. And the problem is when i'm trying to build sources, it compiles but don't link with ffmpeg at all and the next output the linker gives :

  ../../Decoder/libDecoder.a(ConverterAVFrameToRGB.cpp.o): In function `FaceVideo::ConverterAVFrameToRGB::to_rgb_conversion(std::vector >&, int, int, int)':
  
  ConverterAVFrameToRGB.cpp:(.text+0x990): undefined reference to `av_frame_free'
  
  ../../Decoder/libDecoder.a(FfmpegDecoder.cpp.o): In function `FaceVideo::FfmpegDecoder::destroy()':
  
  FfmpegDecoder.cpp:(.text+0xa30): undefined reference to `av_frame_free'
  
  ../../Decoder/libDecoder.a(FfmpegDecoder.cpp.o): In function `FaceVideo::FfmpegDecoder::decode_next_chunk(int)':
  
  FfmpegDecoder.cpp:(.text+0xb6b): undefined reference to `av_frame_clone'
  
  FfmpegDecoder.cpp:(.text+0xc13): undefined reference to `av_frame_free'
  
  ../../Decoder/libDecoder.a(FfmpegEncoder.cpp.o): In function `FaceVideo::FfmpegEncoder::destroy()':
  
  FfmpegEncoder.cpp:(.text+0x132): undefined reference to `avcodec_free_frame'
  
  ../../Decoder/libDecoder.a(FfmpegEncoder.cpp.o): In function `FaceVideo::FfmpegEncoder::encode()':
  
  FfmpegEncoder.cpp:(.text+0x4c4): undefined reference to `avcodec_encode_video2'
  
  FfmpegEncoder.cpp:(.text+0x592): undefined reference to `avcodec_encode_video2'
  
  ../../Decoder/libDecoder.a(FrameSaver.cpp.o): In function `FaceVideo::FrameSaver::saver(std::vector >&, int, int, int)':
  
  FrameSaver.cpp:(.text+0x869): undefined reference to `av_frame_free'
  
  collect2: ld returned 1 exit status

  That's excatly what i don't want to see.

  There are three Cmake files : two for internal libraries (use

  add_library(Decoder ${SOURCES_DECODER})
  
               and 
  
  add_library(Detector ${SOURCES_DETECTOR})

  in them) and one for main executable (use

  add_executable(Tool ${SOURCES_TOOL})
  
               and
  
  target_link_libraries (Tool Decoder avutil avcodec swscale avformat Detector ${OpenCV_LIBS})

  in it).

  As far as i understand from CMake manuals and examples, this should make linker link this libraries together, but no effect.

  I've been trying lot of things such as :
  1) Adding link_directories() with path to libraries (/usr/lib/x86_64-linux-gnu/ for me) wherever it's possile, nothing changed.
  2) Linking every library separately, i mean i tried do something like this in my internal libraries CMake files : target_link_libraries (Decoder avutil avcodec swscale avformat). And then link library together into my Tool CMake file : target_link_libraries (Tool Decoder Detector).
  3) Editing output makefiles.
  4) Compiling simple one-file application just to test whether i can do it or not. I can. g++ -lavcodec -o out mysource.cpp works perfectly.
  5) Compling ffmpeg manually and installing it.

  The fact is i realy don't know what should i do. I have no idea. And i would very appreciate your every answer.

  UPD1 :
  Output when CMAKE_VERBOSE_MAKEFILE is set

   !
  /usr/bin/c++ -march=x86-64 -Wall -fPIC -pthread -std=c++0x -D__STDC_CONSTANT_MACROS -march=x86-64 -fPIC CMakeFiles/FaceDetectorTool.dir/home/anton/Programming/facevideo/branches/Stream_Prototype/src/tools/FaceDetectorTool/facedetector.cpp.o -o FaceDetectorTool -rdynamic ../../Detector/libDetector.a ../../Decoder/libDecoder.a -lavutil -lavcodec -lswscale -lavformat /usr/local/lib/libopencv_videostab.so.2.4.7 /usr/local/lib/libopencv_video.so.2.4.7 /usr/local/lib/libopencv_ts.a /usr/local/lib/libopencv_superres.so.2.4.7 /usr/local/lib/libopencv_stitching.so.2.4.7 /usr/local/lib/libopencv_photo.so.2.4.7 /usr/local/lib/libopencv_ocl.so.2.4.7 /usr/local/lib/libopencv_objdetect.so.2.4.7 /usr/local/lib/libopencv_nonfree.so.2.4.7 /usr/local/lib/libopencv_ml.so.2.4.7 /usr/local/lib/libopencv_legacy.so.2.4.7 /usr/local/lib/libopencv_imgproc.so.2.4.7 /usr/local/lib/libopencv_highgui.so.2.4.7 /usr/local/lib/libopencv_gpu.so.2.4.7 /usr/local/lib/libopencv_flann.so.2.4.7 /usr/local/lib/libopencv_features2d.so.2.4.7 /usr/local/lib/libopencv_core.so.2.4.7 /usr/local/lib/libopencv_contrib.so.2.4.7 /usr/local/lib/libopencv_calib3d.so.2.4.7 -ldl -lm -lpthread -lrt /usr/local/lib/libopencv_nonfree.so.2.4.7 /usr/local/lib/libopencv_ocl.so.2.4.7 /usr/local/lib/libopencv_gpu.so.2.4.7 /usr/local/lib/libopencv_photo.so.2.4.7 /usr/local/lib/libopencv_objdetect.so.2.4.7 /usr/local/lib/libopencv_legacy.so.2.4.7 /usr/local/lib/libopencv_video.so.2.4.7 /usr/local/lib/libopencv_ml.so.2.4.7 /usr/local/lib/libopencv_calib3d.so.2.4.7 /usr/local/lib/libopencv_features2d.so.2.4.7 /usr/local/lib/libopencv_highgui.so.2.4.7 /usr/local/lib/libopencv_imgproc.so.2.4.7 /usr/local/lib/libopencv_flann.so.2.4.7 /usr/local/lib/libopencv_core.so.2.4.7 -Wl,-rpath,/usr/local/lib

  UPD2
  Cmake example looks like that.

  cmake_minimum_required (VERSION 2.8)
  
  project (Decoder)
  
  include(../CMakeInit.cmake)
  
  include_directories(${FFMPEG_INCLUDE_DIR})
  
  include_directories(${Stream_Facevideo_SOURCE_DIR}/../src/kernel/decoder/)
  
  include_directories(${Stream_Facevideo_SOURCE_DIR}/../src/kernel/stuff/)
  
  set(SOURCES_VIDEODECODER
  
              *sources*
  
    )
  
  
  
  if(WINDOWS)
  
      set(SOURCES_VIDEODECODER    ${SOURCES_VIDEODECODER} 
  
              *headers*                           
  
      )
  
  endif(WINDOWS)
  
  
  
  set (SOURCES_DECODER
  
      ${SOURCES_VIDEODECODER}
  
  )
  
  
  
  add_library(Decoder ${SOURCES_DECODER})
  
  link_directories("/usr/lib/x86_64-linux-gnu/")
  
  target_link_libraries(Decoder swscale avformat avcodec avutil)