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• libx264 : which parameters can be changed on fly ?

  12 janvier, par Dan Tumaykin

  I know that it is possible to change some encoder parameters on fly, using x264_encoder_reconfig(). From this commit I can deduce that we can change ratecontrol parameters - but I was unable to find a clear list of parameters that may be changed.

  Question: which parameters of x264 encoder can be changed on fly?

• Why pkg-config overrides 'prefix' with another default one ?

  12 janvier, par SteveH

  I have an issue in using pkg-config to link some libraries to a program. The problem is 'prefix' variable in each library pkg-config files (*.pc) are overridden with an unwanted directory leading to building the program could not find the library's header and lib files.

  Here, one of '*.pc' files, x264.pc:

  prefix=/e/x264/x64-windows-rel  
  exec_prefix=${prefix}   
  libdir=${exec_prefix}/lib   
  includedir=${prefix}/include    
  ...
  

  I run this from MSYS2 terminal:

  pkg-config --cflags --debug x264
  

  This is some of the output it traced out:

  ...
   Parsing package file 'D:/msys64/usr/local/lib/pkgconfig\x264.pc'
   line>prefix=/e/x264/x64-windows-rel
   Variable declaration, 'prefix' overridden with 'D:/msys64/usr/local'
  ...
  

  Note that MSYS2 and pkg-config are updated to newest versions.

  Could anybody tell me why it happens and how to solve the issue without renaming 'prefix' to something else.? Thanks.

• encode x264(libx264) raw yuv frame data

  12 janvier, par Mohamed El-Sayed

  I am trying to encode an MP4 video using raw YUV frames data, but I am not sure how can I fill the plane data (preferably without using other libraries like ffmpeg)

  The frame data is already encoded in I420, and does not need conversion.

  Here is what I am trying to do:

  const char *frameData = /* Raw frame data */;
  
  x264_t *encoder = x264_encoder_open(&param);
  x264_picture_t imgInput, imgOutput;
  x264_picture_alloc(&imgInput, X264_CSP_I420, width, height);
  
  // how can I fill the struct data of imgInput
  
  x264_nal_t *nals;
  int i_nals;
  int frameSize = x264_encoder_encode(encoder, &nals, &i_nals, &imgInput, &imgOutput);
  

  The equivalent command line that I have found is :

   x264 --output video.mp4 --fps 15 --input-res 1280x800 imgdata_01.raw 
  

  But I could not figure out how the app does it.

  Thanks.

• Create a deep copy of internal x264 encoder's state

  9 janvier, par Ragdoll Car

  I am using x264 library: https://github.com/mirror/x264

  We can create a new encoder handler this way:

  x264_param_t param{};  // fill with proper values
  x264_t* handler = x264_encoder_open(&param);
  

  But how can we create a deep copy of handler so we can have two the same encoders with exactly the same internal state?

• is it possible to compile x264 for webassembly using emscripten ?

  4 novembre 2024, par sunder kandasamy

  I am trying to build x264 code for webassembly. i use emconfigure to configure. like below

  emconfigure ./configure --prefix="$(pwd)/em" --enable-shared --enable-static  --disable-cli  --disable-gpl
  

  But this was throwing "No working C compiler found." error. i have gcc compiler 9.3.0 version and have tried reinstalling build-essentials and gcc but still same issue.

  config.log also doesn't help.

  If i provide --host cross compiler flag then it is generating libx264.so file, but i am not sure whether this is right as the wasm code should work in every browser in (windows/mac/linux)

  please tell me first whether compiling x264 using emscripten is possible? If yes, please tell me what is the correct steps to do it