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• Chromium Build Failed on Windows:D3D Compiler DLL (\third_party\angle\src)

  31 mars 2016, par Vish

  I have followed same step mentioned in this question. Few extra flag I have set get propriety FFMPEG codec. Its failing every time, with following logs.

  [233/19712] ACTION Copying D3D Compiler DLL...
  
  FAILED: F:\Chrome\depot_tools\python276_bin\python.exe gyp-win-tool action-wrapper environment.x86 copy_compiler_dll_target_copy_dll_a30e198148542d4bce19a5c818c6884f..rsp ..\..\third_party\angle\src
  
  [233/19712] CC obj\third_party\icu\source\stubdata\icuuc.stubdata.obj
  
  ninja: build stopped: subcommand failed.

  For FFMPEG using following set command :

  set GYP_DEFINES=branding=Chromium buildtype=Official component=shared_library disable_nacl=1 enable_automation=0 enable_captive_portal_detection=0 enable_google_now=0 enable_hidpi=0 fastbuild=1 ffmpeg_branding=Chrome incremental_chrome_dll=0 proprietary_codecs=1 remoting=0

  My System Information Details :

  Windows 10 64 Bit 8 GB RAM. Trail Version of Visual Studio 2015
  Installed, but now it is expired. Now I have installed Community
  Version 2013 update 4.

  Does it effect both version effect the execution ? Checked in path, its using Window Kit 8.1. What other part should I check for successful execution ?

• Error when transcode webm to mp4 using ffmpeg.wasm

  17 février 2021, par arpo

  I have this webm file recorded using MediaRecorder in Chrome.
https://cdn.hibervr.com/video/loop3.webm

  


  When I try to transcode it using ffmpeg.wasm, https://github.com/ffmpegwasm/ffmpeg.wasm

  


  Using this codepen, taken from the official site :
https://codepen.io/jeromewu/pen/NWWaMeY

  


  I get this error in the console and the file isn't playable.

  


  net::ERR_REQUEST_RANGE_NOT_SATISFIABLE


  


  Any clues about how to fix it ?

  


  It works using other webm files like this.
https://phoboslab.org/files/ffmpeg-mt-fixed/jumparound.webm

  


• Header missing in mpg, in spite of using avformat_write_header

  23 novembre 2012, par TheSHEEEP

  I am encoding a live rendered video to mpg and/or mp4 (depends on the later usage of the video) using the ffmpeg C API. When encoding to mp4, everything is well. But when encoding to mpg, the resulting video cannot be played by any player. A quick call to ffprobe on it reveals that the header is missing. But this seems pretty much impossible, as I am explicitly writing it.

  This is how I write the header, before any frame is encoded :

  // ptr->oc is the AVFormatContext
  
  int error = avformat_write_header(ptr->oc, NULL);
  
  if (error < 0)
  
  {
  
      s_logFile << "Could not write header. Error: " << error << endl;
  
      fprintf(stderr, "Could not write header. Error: '%i'\n", error);
  
      return 1;
  
  }

  There never is any error when writing the header.

  For encoding, I am following the official muxing.c example, so I do set the CODEC_FLAG_GLOBAL_HEADER flag. I use CODEC_ID_MPEG2VIDEO (for video) and CODEC_ID_MP2 (for audio).

  The result mpg does work when I "encode" it in an additional step with an external ffmpeg executable like this : "ffmpeg -i ownEncoded.mpg -sameq -y working.mpg".
  So it seems all the data is there, only the header is missing for some reason...

  Here is the only thing ffmpeg is reporting before/when writing the header :

  mpeg -------------------
  
  lvl: 24
  
  msg: VBV buffer size not set, muxing may fail

  Could that be the problem ?

  I wonder what could be wrong here as I encode mp4 with the exact same function, except setting some special values like qmin, qmax, me_method, etc. when encoding to mp4. Do I probably have to set any special values so that ffmpeg really does write the header correctly ?