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• Getting error "WebAssembly.Memory() : could not allocate memory" when running ffmpeg.wasm on android chrome browser

  27 juin 2022, par Ravi Kundu

  Error in detail :

  


  WebAssembly.Memory(): could not allocate memory
at https://*******/ffmpeg-core.js:22:82
at https://*******/ffmpeg.min.js:1:6506
at f (https://*******/ffmpeg.min.js:1:11322)
at Generator._invoke (https://*******/ffmpeg.min.js:1:11110)
at Generator.next (https://*******/ffmpeg.min.js:1:11747)
at i (https://*******/ffmpeg.min.js:1:4295)
at c (https://*******/ffmpeg.min.js:1:4498)


  


  Code for ffmpeg :

  


  const downloadWithFFMPEG = async () =>{
  const sourceBuffer = await fetch(recordingURL).then(r => r.arrayBuffer());
  await ffmpeg.load();
  await ffmpeg.FS(
    "writeFile",
    "input.webm",
    new Uint8Array(sourceBuffer, 0, sourceBuffer.byteLength)
  );
  await ffmpeg.run("-i", "input.webm", "-c", "copy", "output.mp4")
  const output = ffmpeg.FS("readFile", "output.mp4");
  var link = document.createElement('a')
  link.href = URL.createObjectURL(new Blob([output.buffer], { type: 'video/mp4;codecs=H264' }));
  link.download = this.data;
  link.click();
  recording = false;
}


  


  Brief about problem :
The error only comes for android chrome browser. The same code works fine on pc/laptop chrome.
Have also enabled Webassembly-thread on chrome ://flags for android browser as someone suggested me to do it but still same error. Can someone help me ?

  


• Capture desktop screens including audio with ffmpeg

  9 mars 2019, par klaus

  After referring to the official documentation and one other blog post, I now have following script :

  A="$(pacmd list-sources | grep -PB 1 "analog.*monitor>" | head -n 1 | perl -pe 's/.* //g')"
  
  F="/home/enan/Videos/$(date --iso-8601=minutes | perl -pe 's/[^0-9]+//g').mkv"
  
  V="$(xdpyinfo | grep dimensions | perl -pe 's/.* ([0-9]+x[0-9]+) .*/$1/g')"
  
  ffmpeg -video_size "$V" -framerate 25 -f x11grab -i :0.0 -f pulse -i "$A" -f pulse -i default \
  
      -filter_complex amerge -ac 1 -preset veryfast "$F"

  Basically that script results into the following command :

  ffmpeg -video_size 1366x768 -framerate 25 -f x11grab -i :0.0 -f pulse -ac 2 -i default output.mkv

  In this case, with -ac 2, the audio that gets added with the captured video is of some mic. I’m using a laptop and don’t have a mic, so I don’t exactly know which device the outside sounds get added from but it does. But no audio from the main audio that I can hear through the headphone jack doesn’t get added to the video.

  If I use -ac 1 instead, the video now gets the outside audio as well as the internal audio. That’s good. But how do I restrict the video to only add internal audio, not add audio gotten from mic or something similar.

  I don’t know if it’ll help, but adding it anyway. From man mpv :

         -ac[:stream_specifier] channels (input/output,per-stream)
  
             Set the number of audio channels. For output streams it is set by
  
             default to the number of input audio channels. For input streams this
  
             option only makes sense for audio grabbing devices and raw demuxers and
  
             is mapped to the corresponding demuxer options.

• How to batch fade in and fade out multiple videos ffmpeg ?

  25 mars 2021, par user2826193

  I have found several tips on how to batch fade in and fade out a single video using ffprobe.
What I cannot find is how to do several videos using a batch script. I even tried using this code that I found on here :

  


  ffmpeg -i 123.mp4 -filter_complex "fade=d=3.5, reverse, fade=d=3.5, reverse" output.mp4


  


  That works for a single video only without the use of ffprobe. When I tried using it for multiple videos in a for .mp4 batch file, something goes horribly wrong and I get an error : Failed to inject frame into filter network : Cannot allocate memory ffmpeg
The files converted are about 1MB in size and the laptop freezes.

  


  Can anyone point me in the right direction ? Thanks...

  


  EDIT :

  


  This is the code I used...

  


  @echo off
if not exist "faded" mkdir faded
for %%f in ("*.mp4") do ffmpeg -i "%%f" -filter_complex "fade=d=3.5, reverse, fade=d=3.5, reverse" "faded\%%~nf.mp4"


  


  EDIT_2 :

  


  This is what I tried to manipulate to use the ffprobe and FADE instead of TRIM :

  


  @Echo Off
SetLocal
Set "ext=mp4"
Set "opts=-v quiet"
Set "opts=%opts% -print_format "compact=print_section=0:nokey=1:escape=csv""
Set "opts=%opts% -show_entries "format=duration""
If Exist *.%ext% (If Not Exist "Trimmed\" MD Trimmed)
For %%a In (*.%ext%) Do Call :Sub "%%~a"
Exit/B

:Sub
For /f "Tokens=1* Delims=." %%a In (
    'FFProbe %opts% %1') Do (Set/A "ws=%%a-8.25" & Set "ps=%%b")
rem If %ws% Lss 20 GoTo :EOF
Set/A hh=ws/(60*60), lo=ws%%(60*60), mm=lo/60, ss=lo%%60
If %hh% Lss 10 Set hh=0%hh%
If %mm% Lss 10 Set mm=0%mm%
If %ss% Lss 10 Set ss=0%ss%
FFMpeg -i %1 -ss 00:00:04.2500 -to %hh%:%mm%:%ss%.%ps:~,3% -c:v copy -c:a copy "Trimmed\%~1"