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• FFmpeg.wasm stopped working after adding cross origin headers

  10 octobre 2024, par Fnr

  I was having the SharedArrayBuffer error as described in this other issue and to fix I added the cross origin isolation as suggested (also suggested here) by adding the headers

  


  Cross-Origin-Opener-Policy: same-origin
Cross-Origin-Embedder-Policy: require-corp


  


  After that, now when I try to run the code I just got Uncaught ReferenceError : FFmpeg is not defined. The error is happening on Firefox

  


  My code is :

  


  <code class="echappe-js">&lt;script  src=&quot;https://unpkg.com/@ffmpeg/ffmpeg@0.10.0/dist/ffmpeg.min.js&quot;&gt;&lt;/script&gt;&#xA;&lt;script&gt;&amp;#xA;    &amp;#xA;    const { createFFmpeg, fetchFile } = FFmpeg; //error happens here&amp;#xA;    const ffmpegInstance = createFFmpeg({&amp;#xA;        corePath: &amp;#x27;https://unpkg.com/@ffmpeg/core@0.10.0/dist/ffmpeg-core.js&amp;#x27;,&amp;#xA;        log: true,&amp;#xA;    });&amp;#xA; &lt;/script&gt; &#xA;

  


  Before that, on Brave browser the process ran ok without having to add the Cross origin headers and also FFmpeg variable was defined.

  


• Cross compile ffmpeg for Tizen

  6 avril 2022, par lbegue

  Im trying to compile ffmpeg for Tizen TV as a static library using toolchains.
This is the script I'm using :

  


  #!/bin/bash
function buildme
{

./configure --prefix=$PREFIX                    \
                --target-os=linux                 \
                --arch=$ARCH                        \
                --cpu=armv7-a                        \
                --enable-runtime-cpudetect          \
                --disable-doc                       \
                --disable-ffmpeg                    \
                --disable-ffplay                    \
                --enable-cross-compile              \
                --enable-optimizations              \
                --disable-ffprobe                   \
                --disable-devices                   \
                --disable-avdevice                  \
                --disable-debug                     \
                --enable-pic                        \
                --disable-shared                    \
                --enable-gpl                        \
                --enable-static                     \
                --sysroot=/path-to-tizen-studio/tools/arm-linux-gnueabi-gcc-6.2/arm-tizen-linux-gnueabi \
                --cross-prefix=${PLATFORM}/bin/$PLATFORM_PREFIX \
                --extra-cflags="-O3 -std=c++11 -DHAVE_SYS_UIO_H=1 -Dipv6mr_interface=ipv6mr_ifindex -fasm -Wno-psabi -fno-short-enums  -fno-strict-aliasing -finline-limit=300 -fpic $OPTIMIZE_CFLAGS"               \
                --enable-asm                        \
                --extra-ldflags="-Wl,-rpath-link=$PLATFORM/lib -L$PLATFORM/lib -nostdlib" \
                --cc=${CCOMPILER} \
                $ADDITIONAL_CONFIGURE_FLAG

   make clean
   make  V=1
   make install
}

echo configuring....

PLATFORM=/path-to-tizen-studio/tools/arm-linux-gnueabi-gcc-6.2
PREFIX='pwd'/thridParty
PLATFORM_PREFIX=arm-linux-gnueabi-
ARCH=arm
CCOMPILER=${PLATFORM}/bin/arm-linux-gnueabi-g++
OPTIMIZE_CFLAGS="-marm"
buildme

echo end


  


  And I obtain this error :

  


  


  /path-to-tizen-studio/tools/arm-linux-gnueabi-gcc-6.2/arm-tizen-linux-gnueabi/include/c++/6.2.1/arm-tizen-linux-gnueabi/bits/os_defines.h:39:22 :
fatal error : features.h : No such file or directory
#include

  


  


• Cross Fade Arbitrary Number of Videos ffmpeg Efficiently

  15 avril 2022, par jippyjoe4

  I have a series of videos named 'cut_xxx.mp4' where xxx represents a number 000 through 999. I want to do a cross fade on an arbitrary number of them to create a compilation, and each fade should last 4 seconds long. Currently, I'm doing this with Python, but I suspect this is not the most efficient way :

  


  import subprocess    
def get_length(filename):
  result = subprocess.run(["ffprobe", "-v", "error", "-show_entries",
                          "format=duration", "-of",
                          "default=noprint_wrappers=1:nokey=1", filename],
    stdout=subprocess.PIPE,
    stderr=subprocess.STDOUT)
  return float(result.stdout)

CROSS_FADE_DURATION = 4

basevideo = 'cut_000.mp4'
for ii in range(total_videos - 1):
  fade_start = math.floor(get_length(basevideo) - CROSS_FADE_DURATION) # new one
  outfile = f'cross_fade_{ii}.mp4'
  append_video = f'cut_{str(ii+1).zfill(3)}.mp4'
  cfcmd = f'ffmpeg -y -i {basevideo} -i {append_video} -filter_complex "xfade=offset={fade_start}:duration={CROSS_FADE_DURATION}" -an {outfile}'
  basevideo = outfile
  subprocess.call(cfcmd)
  print(fade_start)


  


  I specifically remove the audio with -an because I'll add an audio track later. The issue I see here is that I'm compressing the video over and over again with each individual video file I add to the compilation because I'm only adding one video at a time and then re-encoding.

  


  There should be a way to cross fade multiple videos together into a compilation, but I'm not sure what this would look like or how I would get it to work for an arbitrary number of video files of different durations. Any idea on what that monolithic ffmppeg command would look like or how I could automatically generate it given a list of videos and their durations ?