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• RuntimeError : abort(OOM). Build with -s ASSERTIONS=1 for more info

  26 avril 2021, par KhoPhi

  I'm using ffmpeg.wasm 0.9.7 (at the time of this question).
Browser is Brave (Version 1.23.71 Chromium : 90.0.4430.72 (Official Build) (64-bit))

  


  I get this error running an overlay ffmpeg command in the browser, slapping an png over an hevc mp4 4K video of size, almost 40 Megabyte.

  


  RuntimeError: abort(OOM). Build with -s ASSERTIONS=1 for more info.

  


  Here's my code in Angular. Stripped down for brevity

  


  async generatePreviews(event: any) {

    if (!ffmpeg.isLoaded()) {
      await ffmpeg.load();
    }

    for (let index = 0; index < this.files.length; index++) {

      this.video = this.files[index];
      const file_name = this.video.name.split('.')[0] + '-preview.mp4';

      ffmpeg.FS('writeFile', 'tempLogo.png', await fetchFile(this.watermark));
      ffmpeg.FS('writeFile', 'tempVideo.mp4', await fetchFile(this.video));


      // working command in normal terminal
      // ffmpeg -i tempVideo.mp4 -i tempLogo.png -filter_complex "overlay=(W-w)/2:(H-h)/2" temp.mp4

      await ffmpeg.run(
        '-i',
        'tempVideo.mp4',
        '-i',
        'tempLogo.png',
        '-filter_complex',
        'overlay=(W-w)/2:(H-h)/2',
        'temp.mp4'
      );

      const data = ffmpeg.FS('readFile', 'temp.mp4');

      var blob = new Blob([data.buffer], { type: 'video/mp4' });
      saveAs(blob, file_name); // using filesaver.js to save the blob

    }
  }
}



  


  In chrome, I read up to 2Gb of file is possible to convert. Not sure why the OOM issues. Any settings I need to set or changes I need to do ?

  


  Update (4/26/2021)

  


  This thread offered a solution, by building the ffmpeg wasm with a few tweaks. I am able to build, but using the built files even causes the OOM faster than the npm built from the ffmpeg wasm repo.

  


• Slient crash when calls to ffmpeg's libav exist

  9 juin 2021, par William Lohan

  I have a fairly simple example.

  


  #include <iostream>&#xA;&#xA;extern "C"&#xA;{&#xA;#include <libavutil></libavutil>opt.h>&#xA;#include <libavutil></libavutil>avutil.h>&#xA;#include <libavcodec></libavcodec>avcodec.h>&#xA;#include <libavformat></libavformat>avformat.h>&#xA;}&#xA;&#xA;int main(int, char **)&#xA;{&#xA;  AVFormatContext *format = 0; // avformat_alloc_context();&#xA;&#xA;  // avformat_open_input(&amp;format, "http://s5radio.ponyvillelive.com:8026/stream.mp3", NULL, NULL);&#xA;  // avformat_find_stream_info(format, NULL);&#xA;&#xA;  std::cout &lt;&lt; "Hello, world!" &lt;&lt; std::endl;&#xA;&#xA;  return 0;&#xA;}&#xA;</iostream>

  


  I this outputs "Hello, world !" and I can set break points but the moment I uncomment anything calling avformat code the program silently closes with no error and no break points are hit making it impossible to debug.

  


  An example would be changing AVFormatContext *format = 0; to AVFormatContext *format = avformat_alloc_context(); or uncommenting avformat_open_input(&format, "http://s5radio.ponyvillelive.com:8026/stream.mp3", NULL, NULL);. Without breakpoints or errors how do I solve ?

  


  Update :
This is what I get from the debugger :

  


  


  ERROR : Unable to start debugging. Unexpected GDB output from command "-exec-run". During startup program exited with code 0xc0000139.
The program 'path\to\my\project\LibavPlayground.exe' has exited with code 0 (0x00000000).

  


  


  Update2 :

  


  this is my cmake :

  


  cmake_minimum_required(VERSION 3.0.0)
project(LibavPlayground VERSION 0.1.0 LANGUAGES CXX C)

find_package(PkgConfig REQUIRED) 
pkg_check_modules(LIBAV REQUIRED libavutil libavcodec libavformat)
include_directories(${LIBAV_INCLUDE_DIRS})
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D__STDC_CONSTANT_MACROS -Wno-deprecated-declarations")

include_directories(include PUBLIC)
include_directories(src PRIVATE)

file(GLOB SRC_FILES ${PROJECT_SOURCE_DIR}/src/*.cpp)

add_executable(LibavPlayground ${SRC_FILES})
target_link_libraries(LibavPlayground ${LIBAV_LIBRARIES})


  


  and all the libav* libraries were installed with a single pacman -S mingw-w64-x86_64-ffmpeg command

  


• How to add watermark text scrollable using ffmpeg vertically from right top to bottom

  22 juillet 2015, par Jeetendra

  Am using ffmpeg to transcode the video with text watermark. Below is my command that I am using but it scrolls the text bottom left to right.

  ffmpeg -i /usr/home/test.mp4 -vf "drawbox=x=iw-42:y=0:w=42:h=ih:color=black@0.5:t=80,drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeSerifBold.ttf:text='Hello World':fontcolor=white@1.0:fontsize=16: y=(mod(2*n\,h+th)-th):x=w-tw-10" -codec:v libx264 -codec:a copy -strict -2 /usr/home/out.mp4

  But I want vertical scrolling top to bottom.

  Can anyone help in this.

  Thanks in advance.