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• HTML5 Video Compatibility (MP4, WEBM, OGG) in 2021

  19 juillet 2021, par William

  The support of HTML5 video has evolved a lot over the years. I am trying to understand whether the <video></video> element still needs to have three sources : MP4, WEBM, and OGG.

  


  There are a lot of answers throughout StackOverflow with deeply conflicting information - some of which say that you just need MP4 now, others say, MP4 and WEBM are enough, and then finally many say that you need all three (although many of those article are 10 years old).

  


  W3 suggests that either MP4 or WEBM alone would have universal support (Even though I found a 2011 article from Google saying that they would be removing support for MP4/H.264). Wikipedia paints a more complicated picture (as well as listing that Google Chrome does indeed support MP4/H.264). Azure Media services ONLY seems to allow output in MP4, which would suggest to me that MP4 must have widespread compatibility.

  


  Also see Example 1, Example 2, Example 3.

  


  Is there any definitive information on what video types to include in an HTML5 video player to achieve widespread compatibility ?

  


  Background : I am building a Content Management Platform that allows uploading videos. When a new video is uploaded, a conversion process kicks off to convert the video into the required formats. This takes time and CPU/Memory, so if it is possible I would like to convert uploaded videos into as few formats as possible.

  


  p.s. This question HAS been asked before, however, the fundamentals of playing video on the web continually evolve and most of the answers out there have become irrelevant.

  


• Android NDK Build FFMPEG in 2021

  19 janvier 2023, par Kyros

  I'm working on an android app, and I have to convert webm files to mp3.
I really want to make a custom ffmpeg build, because it reduces the ffmpeg executable size to only 2MB.

  


  My library works absolutely fine when running on my PC, but i'm struggling to build it for android... It seems like NDK architecture has changed and tutorials are outdated, and I can't find a proper and recent guide for android compiling...

  


  I also would like to target all architectures (aarch64, armv7, i686, and x86_64)...

  


  I've been on this for hours, fixed many errors, but still nothing has worked ><.&#xA;Please help me ! :

  &#xA;

  PS. I'm compiling on Linux, here is my configuration script :

  &#xA;

  #!/bin/bash

API=31 # target android api

OUTPUT=/home/romain/dev/android/ffmpeg_build

NDK=/home/romain/android-sdk/ndk/23.0.7599858
TOOLCHAIN=$NDK/toolchains/llvm/prebuilt/linux-x86_64
SYSROOT=$TOOLCHAIN/sysroot

TOOL_PREFIX="$TOOLCHAIN/bin/aarch64-linux-android"

CC="$TOOL_PREFIX$API-clang"
CXX="$TOOL_PREFIX$API-clang++"

./configure \
    --prefix=$OUTPUT \
    --target-os=android \
    --arch=$ARCH \
    --cpu=$CPU \
    --disable-everything \
    --disable-everything \
    --disable-network \
    --disable-autodetect \
    --enable-small \
    --enable-decoder=opus,vorbis \
    --enable-demuxer=matroska \
    --enable-muxer=mp3 \
    --enable-protocol=file \
    --enable-filter=aresample \
    --enable-libshine \
    --enable-encoder=libshine \
    --cc=$CC \
    --cxx=$CXX \
    --sysroot=$SYSROOT \
    --extra-cflags="-0s -fpic"

make
make install


  &#xA;

• Revision 26fead7ecf : Renaming in MB_MODE_INFO The macro block mode info context originally contained

  13 août 2013, par Paul Wilkins

  Changed Paths :
   Modify /vp9/common/vp9_alloccommon.c

  
   Modify /vp9/common/vp9_blockd.h

  
   Modify /vp9/common/vp9_debugmodes.c

  
   Modify /vp9/common/vp9_loopfilter.c

  
   Modify /vp9/common/vp9_mvref_common.c

  
   Modify /vp9/common/vp9_postproc.c

  
   Modify /vp9/common/vp9_pred_common.c

  
   Modify /vp9/common/vp9_pred_common.h

  
   Modify /vp9/decoder/vp9_decodemv.c

  
   Modify /vp9/decoder/vp9_decodframe.c

  
   Modify /vp9/encoder/vp9_bitstream.c

  
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/vp9_rdopt.c

  
   Modify /vp9/encoder/vp9_tokenize.c

  
  
  Renaming in MB_MODE_INFO

  The macro block mode info context originally contained an
  entry for each 16x16 macroblock. In VP9 each entry refers
  to an 8x8 region not a macro block, so the naming is misleading.

  This first stage clean up changes the names of 3 entries in the
  structure to remove the mb_ prefix.

  TODO clean up the nomenclature more widely in respect of
  mbmi and bmi.

  Change-Id : Ia7305c6d0cb805dfe8cdc98dad21338f502e49c6