Recherche avancée

Sur d’autres sites (2289)

• calling ffmpeg.c function inside native.cpp in android cmake

  10 septembre 2020, par yejafot

  i generated and attached libavcodec.so,libavdevice.so,libavfilter.so,libavformat.so,libavutil.so,libswresample.so,libswscale.so using cmakelists.txt file

  


  add_library( # Sets the name of the library.
        native-lib

        # Sets the library as a shared library.
        SHARED

        # Provides a relative path to your source file(s).
        native-lib.cpp )

#Add an example of so library.
# avdevice
add_library(avdevice
        SHARED
        IMPORTED)
set_target_properties(avdevice
        PROPERTIES IMPORTED_LOCATION
        ${ARM_DIR}/${ANDROID_ABI}/lib/libavdevice.so)
.
.
.
etc


  


  In native-lib.cpp file i can now edit videos by calling this functions avformat_open_input(). As i could see its very difficult and also very few examples available in ffmpeg for c functions api(native code). I now decide to call ffmpeg main() and pass commands as argument.

  


  ffmpeg -i input.mp4


  


  I could see many do by this method only. I dont know the exact difference between these two methods but i think i can customise more if i do it with c functions api(native code).

  


  Now i have only library's shared object like libavcodec.so . How do i attach ffmpeg.c file and i think it needs config.h file that too i think i should build for each environment(arm64-v8a,armeabi-v7a). Since i have only native.cpp c++ file how do i attach ffmpeg.c,config.h files with it ? So that i can run commands by

  


  run(new String[]{
            "ffmpeg", "-h"
        });
   -------------------------------------
JNIEXPORT void JNICALL Java_uk_co_halfninja_videokit_Videokit_run(JNIEnv *env, jobject obj, jobjectArray args)
{
    int i = 0;
    int argc = 0;
    char **argv = NULL;
    jstring *strr = NULL;

    main(argc, argv);


  


  I could see this git repo. They first generated .so files and attached the ffmpeg.c which they took from ffmpeg/fftools directory i think, by using Android.mk file.
github.com/halfninja/android-ffmpeg-x264/blob/master/Project/jni/videokit/ffmpeg.c

  


  Since im having cmake i have to do in different method i think. Im confused and dont understand how it works. Anyone know can help ! Thanks

  


• Use FFMPEG to put images separately inside a "box" and keeping their original positions of the X and Y boundaries and maybe modify their offsets

  14 septembre 2020, par karl-police

  I have a collection of images, for this example, I created 3 images that have different sizes, but the image itsself is the same, except it is moved more down or left or right.

  


  1 : 2 : 3 :

  


  These are the images. The total sizes of all images together is 35x39, so that means that they need to go inside an 35x39 image so it can later be used to craft them into a GIF as example. Since "crop" does not really work as it crops it smaller and can't make them bigger and I can't imagine it being the best solution for that anyway, perhaps.

  


  So this is the invisible 35x39 sized box.

  


  image :

  


  So what I'm trying to do is to figure out how I can put each of these images separately in the 35x39 sized box, but maintaining the original X position or the Y position or both, from the boundaries of the images. I'm trying to figure out how I can do this for other transparent images for similar things, mostly used to craft animations. Here into a GIF out of image collections, but the images need to be fixed first.

  


  I tried to look in the FFMPEG documentation, but there's many many filters and etc. that I had a few issues finding the right thing. I'm also not sure if it is also then possible to change the offset of the X and Y, because I think if there's something to make it keep the original position of X and Y, then I also think that there's probably something to change the offset of it aswell.

  


   

  


  End result of the images could basically be :

  


  1 : 2 : 3 :

  


  This end result example of the images, basically have their X aligned on the top and Y aligned on the left. I'm not sure if you can call it "original X position", because if I compare it to Photoshop's special paste and keep at original position, it puts the first image a bit more down as example, for some reason. So I just moved the X all the way to the top and the Y all the way to the left.

  


• How to espace quotes, double quotes and colon inside double quotes when using FFMpeg

  23 septembre 2020, par DnerD.Dev

  I'm trying to get a text written onto a video. I can get it to work when I do it in a single line but not when I need to quote the drawtext inside the double quotes to write two lines.

  


  ffmpeg.exe -i input.ts -vf "[in]drawtext=fontfile=Bebas-Regular.ttf:text='"Day: Sunday"':fontcolor=white:y=(h-h*0.2):x=(w-w*0.95):fontsize=36, drawtext=fontfile=Bebas-Regular.ttf:text='"thing1, thing2, thing3"':fontcolor=white:y=(h-h*0.1):x=(w-w*0.95):fontsize=36[out]" -codec:a copy output1.mp4

  


  I've tried so many combinations of \ but I can't get it to work. The error I get is the following :

  


  Unable to find a suitable output format for 'Sunday':fontcolor=white:y=(h-h*0.2):x=(w-w*0.95):fontsize=36, drawtext=fontfile=Bebas-Regular.ttf:text='thing1,'
Sunday':fontcolor=white:y=(h-h*0.2):x=(w-w*0.95):fontsize=36, drawtext=fontfile=Bebas-Regular.ttf:text='thing1,: Invalid argument


  


  I need the video to have this :

  


  Day: Sunday
Thing1, Thing2, Thing3