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  • Compiling ffmpeg for mingw leads to undefined reference ?

    24 juillet 2023, par darclander

    I would like to use ffmpeg for windows and mingw which made me look at :

    


    


    I was successful at using MSYS according to the documentation / guides above. I followed these steps :

    


      

    1. Download ffmpeg source files (from here).

      2. 


    2. Open MSYS mingw shell

      3. 


    3. Go to the ffmpeg directory.

      4. 


    4. Run ./configure --disable-shared --enable-static

      5. 


    5. Run make -j4

      6. 


    6. Run make install

      7. 


    


    But when I am trying to compile g++ -o main main.cpp -IC:\ffmpeg\include -LC:\ffmpeg\lib -lavformat :

    


    #include <iostream>&#xA;&#xA;extern "C" {&#xA;    #include "libavformat/avformat.h"&#xA;    #include "libavcodec/avcodec.h"&#xA;    #include "libswscale/swscale.h"&#xA;}&#xA;&#xA;int main() {&#xA;    avformat_network_init();&#xA;    return 0;&#xA;}&#xA;&#xA;</iostream>

    &#xA;

    I get the following error message : undefined reference to &#x27;avformat_network_init&#x27; which I assume is me doing something incorrectly when installing the libraries since if I change the -lavformat to something else I get cannot find -lSOMETHING. The headers are also "found" since I can use for example AVFormatContext* formatContext = NULL; found in avformat.h. The lib directory contains : libavcodec.a libavdevice.a libavfilter.a libavformat.a libavutil.a libswresample.a libswscale.a

    &#xA;

    Am I missing something obvious or where could the issue be ?

    &#xA;

  • how to use ffmpeg to apply 1:1 SAR before concat on large complex filter

    24 avril 2019, par 2c2c

    I use ffmpeg to concat videos in a fashion similar to this :

    I ran into a weird error with my inputs

    [Parsed_concat_0 @ 000000002a05bb80] Input link in10:v0 parameters (size 1280x720, SAR 2049:2048) 
    
do not match the corresponding output link in0:v0 parameters (1280x720, SAR 1:1)

    From what I’ve researched I need to use setsar to force all the videos to be 1:1 before I concat, but I’m not sure how to do that in my filter.

  • Why ffmpeg-split AVI movie freezes when played

    29 septembre 2015, par bl4ck5un

    I used ffmpeg to split AVI movies like

    ffmpeg -i input.avi -vcodec copy -acodec copy -ss 00:22:33 -to 1:2:3 out.avi

    But the output file out.avi is sometimes weird when played (in MPlayerX, for example) — it will stop at the first frame, freezing like a picture, but if I drag the process bar forward, then continue playing at a different place, everything would be fine and the video just goes on smoothly.

    I have limited knowledge on AVI format and ffmpeg, can you guys point out what’s the problem here ? If it’s a matter of kerFrame or what ?

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