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• FFMPEG and AWS : What's the most efficient way to handle this ?

  28 mai 2022, par Red Vic

  I'm new to AWS and I originally built the FFmpeg functions on my Node.JS API. But I realized this is the wrong way to do it in a real-world app, and that you need to use separate Lambda functions in AWS that handle the video editing separately from the main server.

  


  I'm mainly a front-end developer but I'm open to learning new things.

  


  I basically have the following process in my app :

  


  

  • User uploads video.

  


  • I need to take that video and add a watermark to it.

  


  • I then need a copy of the watermarked video in a smaller resolution.

  


  • I then need a 6 seconds GIF of the smaller resolution video.

  


  • Finally, I need to upload the 3 edited files (2 .mp4's and 1 .gif) to S3, and remove the original, non-watermarked video.

  


  


  Here are my questions to be clear :

  


  

  • Should I upload the original file to S3 or to the server ? And why ?

  


  • Is the process above doable in a single Lambda function ? Or do I need more Lambda functions ?

  


  • How would you handle this problem, personally ?

  


  


  I originally built it by chaining one function to the next with promises, but AWS seems like a different world of doing things and the way I originally built it would not work.

  


  Thanks a lot.

  


  Update
Here are some tests I did with a couple videos :

  


  





  


  


  


  


  


  


  


  


  



  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  	Test 1	Test 2	Test 3	Test 4	Test 5
  Original video resolution	1080p	1080p	1080p	1080p	480p
  Original video duration	23 minutes	15 minutes	11 minutes	3.5 minutes	5 minutes
  Step 1 duration (Watermarking original video)	30 minutes	18 minutes	14 minutes	4 minutes	2 minutes
  Step 2 duration (Watermarking lower resolution)	5 minutes	3 minutes	3 minutes	1 minute	skip (already low res)
  Step 3 duration (6 seconds GIF creation)	negligible (15 seconds)	negligible (10 seconds)	negligible (7 seconds)	negligible	negligible
  Total	35 minutes	21 minutes	17 minutes	5 minutes	2 minutes

  


• How do I use ffmpeg to chop up video files in a folder for instagramstoris ?

  12 mai 2022, par Mikhail Eliseev

  There are a lot of *mov videofiles in the folder. (there are two of them on the screenshot).

  


  I want to cut all these *mov files for Instagram storisvideo long 59 seconds (it does not matter which frame to cut). As a result there will be a lot of video files of 59 seconds.

  


  screenshot

  


  I want to cut each videofile to have on each final videos these parameters :

  


  MP4 Container format
H.264 Video Codec
AAC Audio
3500kbps bitrate
30 FPS
60 seconds maximum in length
1080p 9:16 ( 1080 х 1920 px)
enter code here


  


  I made this CMD file for ffmpeg :

  


  @echo off
for %%i in (*.mov) do (
ffmpeg -i "%%i" -vf scale=ih*9/16:ih,scale=iw:-2,setsar=1,scale=-2:1080, -f segment -segment_time 59 -segment_format_options movflags=+faststart -force_key_frames "expr: gte(t, n_forced * 0.5)" -y "^%03d.mp4"
)
pause


  


  How to pass an error ? Screenshot of the error :
error screenshot

  


• HLS "bufferStalledError" / "bufferNudgeOnStall"

  20 avril 2022, par Yago

  I'm trying to stream videos with HLS.js, and it works perfectly fine, but when I separate the audio from the video to support multiple audio tracks, it returns these two errors at random times in the video ("bufferStalledError" and "bufferNudgeOnStall").

  


  I've tried using pure ffmpeg, I've tried using shaka packager, and I'm currently using bento4, but this error always occurs

  


  (my bento4 code)

  


  mp4hls --hls-version 4 -o "${outputFolder}" -f
[type=audio,+language=Japanese]"${inputFolder}${epFolder}/1080p.mp4"
[type=video]"${inputFolder}${epFolder}/1080p.mp4"
[type=video]"${inputFolder}${epFolder}/720p.mp4"
[type=video]"${inputFolder}${epFolder}/480p.mp4"
[type=video]"${inputFolder}${epFolder}/360p.mp4"
[type=video]"${inputFolder}${epFolder}/240p.mp4"