Recherche avancée

Sur d’autres sites (5202)

• react cant find ffmpegwasm

  18 septembre 2024, par Martin

  I am trying to create a working example for ffmpeg wasm with react js in my browser.

  


  I have been following this very simple example :
https://www.youtube.com/watch?v=-OTc0Ki7Sv0&ab_channel=Fireship

  


  installed ffmpeg locally inside my react repo node_modules as seen here :


  


  And followed to tutorial video to edit the App.jsx so it looks like this :

  


  import React, { useState, useEffect } from &#x27;react&#x27;;&#xA;import &#x27;./App.css&#x27;;&#xA;&#xA;import { createFFmpeg, fetchFile } from &#x27;@ffmpeg/ffmpeg&#x27;;&#xA;const ffmpeg = createFFmpeg({&#xA;  log: true,&#xA;});&#xA;function App() {&#xA;  &#xA;  const [ready, setReady] = useState(false);&#xA;&#xA;  const load = async () => {&#xA;      console.log(&#x27;load()&#x27;)&#xA;      await ffmpeg.load();&#xA;      setReady(true);&#xA;  }&#xA;&#xA;  useEffect(()=>{&#xA;    load();&#xA;  }, [])&#xA;&#xA;  return (&#xA;    <div classname="App">&#xA;      content&#xA;    </div>&#xA;  );&#xA;}&#xA;&#xA;export default App;&#xA;&#xA;

  


  But this leads to error messages in my win10 command prompt terminal saying it cant find the ffmpeg files :

  


  [16:07:47] [snowpack] [404] Not Found (/node_modules/@ffmpeg/core/dist/ffmpeg-core.js)
[16:07:47] [snowpack] [404] Not Found (/node_modules/@ffmpeg/core/dist/ffmpeg-core.wasm)
[16:07:47] [snowpack] [404] Not Found (/node_modules/@ffmpeg/core/dist/ffmpeg-core.worker.js)


  


  I've even tried moving the ffmpeg files to my public folder and editing the code to find them like so :

  


  const ffmpeg = createFFmpeg({
  log: true,
  corePath: '../public/@ffmpeg/core/dist/ffmpeg-core.js',
});


  


  But the same error occured. Why doesn't my react App.jsx file correctly find the ffmpeg files in my node_modules folder ?

  


• FFMPEG : how to wrap h264 stream into FLV container ?

  6 juillet 2017, par jiandingzhe

  What I want is straightforward : wrap H.264 video stream into a FLV container. However, ffmpeg just decode the input stream and pack raw video stream into FLV. The details are described below :

  The input stream is captured from a hardware-encoder video camera, and the FLV will be sent to some video server. Firstly I used following command :

  $ ffmpeg -framerate 15 -s 320x240 -i /dev/video1 -f flv "rtmp://some.website.com/receive/path"

  However, the resultant stream is suspicious. The watching side don’t get any H.264 thing. Then I made a test by writing output to local files.

  1 : Read raw stream, encode by h264_omx, write to FLV file :

  $ ffmpeg -framerate 15 -s 320x240 -i /dev/video0 -codec h264_omx -f flv raw_input_h264_omx.flv
  
  
  
  ......
  
  Input #0, video4linux2,v4l2, from '/dev/video0':
  
    Duration: N/A, start: 194017.870905, bitrate: 18432 kb/s
  
      Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 320x240, 18432 kb/s, 15 fps, 15 tbr, 1000k tbn, 1000k tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (h264_omx))
  
  ......

  2 : Read H264 stream, write to FLV file :

  $ ffmpeg -framerate 15 -s 320x240 -i /dev/video1  -f flv h264_input.flv
  
  
  
  ......
  
  Input #0, video4linux2,v4l2, from '/dev/video1':
  
    Duration: N/A, start: 194610.307096, bitrate: N/A
  
      Stream #0:0: Video: h264 (Main), yuv420p(progressive), 320x240, 15 fps, 15 tbr, 1000k tbn, 2000k tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> flv1 (flv))
  
  ......

  Then read the two files correspondingly :

  $ ffmpeg -i raw_input_h264_omx.flv
  
  ......
  
      Stream #0:0: Video: h264 (High), yuv420p(progressive), 320x240, 200 kb/s, 15 fps, 15 tbr, 1k tbn
  
  
  
  $ ffmpeg -i h264_input.flv
  
  ......
  
      Stream #0:0: Video: flv1, yuv420p, 320x240, 200 kb/s, 15 fps, 15 tbr, 1k tbn

  It is clear when I give a H.264 stream, ffmpeg firstly decodes it, then pack the raw video into FLV. How to avoid that happen, and have the H.264 stream packed directly ?

  Supplement : I will eventually pushing multiple video streams, so don’t ask me to allow ffmpeg’s silent decoding, and encode the stream again.

• Errors compiling ffmpeg for iPhone

  20 juillet 2013, par simon.d

  I'm on OS X Lion and I'm trying to compile the armv7 libraries of ffmpeg for the iPhone. I'm using ffmpeg 0.10.

  Here's my configure line :

  ./configure --disable-doc --disable-ffmpeg --disable-ffplay --disable-ffserver --disable-ffprobe --enable-cross-compile --arch=arm --target-os=darwin --cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc --as='gas-preprocessor/gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc' --sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk --cpu=cortex-a8 --extra-cflags='-arch armv7' --extra-ldflags='-arch armv7 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk' --enable-pic --disable-avdevice --disable-avfilter --disable-zlib --disable-bzlib

  Configure runs fine although it ends with : WARNING : Compiler does not indicate floating-point ABI, guessing soft.

  Here are my make results :

  Users-MacBook-Pro:ffmpeg-0.10 user$ make
  
  CC    libavformat/4xm.o
  
  CC    libavformat/a64.o
  
  CC    libavformat/aacdec.o
  
  CC    libavformat/ac3dec.o
  
  CC    libavformat/act.o
  
  CC    libavformat/adtsenc.o
  
  CC    libavformat/adxdec.o
  
  CC    libavformat/aea.o
  
  CC    libavformat/aiffdec.o
  
  CC    libavformat/aiffenc.o
  
  CC    libavformat/allformats.o
  
  CC    libavformat/amr.o
  
  CC    libavformat/anm.o
  
  CC    libavformat/apc.o
  
  CC    libavformat/ape.o
  
  CC    libavformat/apetag.o
  
  CC    libavformat/applehttp.o
  
  CC    libavformat/applehttpproto.o
  
  CC    libavformat/asf.o
  
  CC    libavformat/asfcrypt.o
  
  error: invalid operand in inline asm: 'ldr   ${0:Q}, $1 
  
      ldr   ${0:R}, $2 
  
      '
  
  make: *** [libavformat/asfcrypt.o] Error 1
  
  Users-MacBook-Pro:ffmpeg-0.10 user$

  Any ideas ? Thanks !