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  • FFMPEG not "cutting" as expected

    1er août 2015, par user1815241

    I am using FFMPEG (from a java application) via a simple system.process and trying to cut a video into chunks. I am attempting to cut it into 10 second increments. My FFMPEG commands look like :

    ffmpeg -i SampleVideo.mp4 -ss 00:00:00.00 -t 00:00:10.00 -strict -2 1438458522836/1438458522836_0.mp4
    
ffmpeg -i SampleVideo.mp4 -ss 00:00:10.01 -t 00:00:20.00 -strict -2 1438458522836/1438458536306_1.mp4
    
ffmpeg -i SampleVideo.mp4 -ss 00:00:20.01 -t 00:00:30.00 -strict -2 1438458522836/1438458546042_2.mp4
    
ffmpeg -i SampleVideo.mp4 -ss 00:00:30.01 -t 00:00:40.00 -strict -2 1438458522836/1438458561165_3.mp4
    
ffmpeg -i SampleVideo.mp4 -ss 00:00:40.01 -t 00:00:50.00 -strict -2 1438458522836/1438458577187_4.mp4
    
ffmpeg -i SampleVideo.mp4 -ss 00:00:50.01 -t 00:01:00.00 -strict -2 1438458522836/1438458587935_5.mp4

    They look correct to me but my videos are not coming out in 10 second increments. They seem to be getting "split" in random spots. Any ideas on what I am doing wrong ?

    For reference :

    video 0 == 10 seconds
    
video 1 == 20 seconds
    
Video 2 == 30 seconds
    
Video 3 == 32 seconds
    
Video 4 == 22 seconds
    
Video 5 == 12 seconds

    Any help would be appreciated.

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  • Opencv Won't compile due to "cap_ffmpeg_impl.hpp" and "ffmpeg_codecs.hpp"

    13 octobre 2022, par AmberGraph41161

    I am new to opencv and linux. I am trying to install opencv or build opencv from source to use the library with c++. When building or trying to use "make" to build all the files, everything is fine until around 50% (I've tried to redo the entire installation process multiple times over because I have no idea what I am doing and keep getting the same errors). At around the 50% mark, I get the same two errors :

    


    make[2]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/build.make:244: modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_ffmpeg.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:5218: modules/videoio/CMakeFiles/opencv_videoio.dir/all] Error 2
make: *** [Makefile:166: all] Error 2


    


    I get these two errors as well as a ton of build error messages containing errors about 2 files in particular (I get a bunch of errors and all of them deal with 2 files).

    


    /home/jinwoo_k/opencv/opencv-4.6.0/modules/videoio/src/ffmpeg_codecs.hpp:96:27: error: ‘CODEC_ID_LJPEG’ was not declared in this scope; did you mean ‘AV_CODEC_ID_LJPEG’?
   96 | #define AV_CODEC_ID_LJPEG CODEC_ID_LJPEG
      |                           ^~~~~~~~~~~~~~
/home/jinwoo_k/opencv/opencv-4.6.0/modules/videoio/src/cap_ffmpeg_impl.hpp:215:26: note: in expansion of macro ‘AV_CODEC_ID_LJPEG’
  215 | #  define CV_CODEC(name) AV_##name
      |                          ^~~
/home/jinwoo_k/opencv/opencv-4.6.0/modules/videoio/src/cap_ffmpeg_impl.hpp:2842:10: note: in expansion of macro ‘CV_CODEC’
 2842 |     case CV_CODEC(CODEC_ID_LJPEG):
      |          ^~~~~~~~
/home/jinwoo_k/opencv/opencv-4.6.0/modules/videoio/src/ffmpeg_codecs.hpp:100:30: error: ‘CODEC_ID_RAWVIDEO’ was not declared in this scope; did you mean ‘AV_CODEC_ID_RAWVIDEO’?
  100 | #define AV_CODEC_ID_RAWVIDEO CODEC_ID_RAWVIDEO
      |                              ^~~~~~~~~~~~~~~~~



    


    ^^^These are just a couple of the error messages, I get hundreds of them.

    


    I read another stackoverflow post about opencv and ffmpeg : OpenCV 3.0.0 make error with FFMPEG
but I don't think that this is the same error that I have. I don't believe that I have made a mistake in the installation or build process or anything with cmake - I have followed and redone the process of following mutliple video and forum guides on how to install opencv. What am I doing wrong ?

    


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