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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

  


• Determine timestamp in mpg video of KLV streams

  22 février 2024, par Joshua Levoy

  I'm currently working with MISP compliant klv data containing mpg videos. I'm able to find the streams containing this data with ffmpeg using the following command

  


  `ffmpeg -v 0 -ss 0 -i "Day Flight.mpg" -map 0:1 -f framecrc  -`


  


  By varying the -ss argument I am able to select for different klv streams by excluding parts of the video, which leads me to believe that ffmpeg is capable of determining how far into the video these klv streams are. I'd very much be interested in finding these timestams of the KLV streams, such that I can create a process by which a misp compliant mpg video can be clipped into smaller segments, for which its relevant MISP-compliant klv data will be preserved.

  


  Is there a way to get ffmpeg to show me the timestamps where these KLV streams begin, and if not, does anyone know of any better approach to determining the position within the video of these klv streams ?

  


  you can obtain the mpg video file containing mpg data that I am using here https://samples.ffmpeg.org/MPEG2/mpegts-klv/Day%20Flight.mpg

  


  Currently I have run the line laid out above and receive the following output :

  


     #software: Lavf58.29.100 #tb 0: 1/90000 #media_type 0: data #codec_id 0: klv 0,          0,          0,        0,      163, 0xc7572adf, S=1,        1, 0x00bd00bd 0,          0,          0,        0,      163, 0xeddd2774, S=1,        1, 0x00bd00bd 0,          0,          0,        0,      163, 0x5c8d29b0, S=1,        1, 0x00bd00bd 0,          0,          0,        0,      163, 0xb7c428f5, S=1,        1, 0x00bd00bd 0,          0,          0,        0,      163, 0x3c3d28a5, S=1,        1, 0x00bd00bd 0,          0,          0,        0,      162, 0x5cdd2898, S=1,        1, 0x00bd00bd

  


  which is useful for determining there are KLV packets within the video but provides me very little in the way of the timestamp where they are relevant. I have other methods of extracting and decoding these KLV values at these locations, but what I'm interested in specifically, is knowing as close as possible the exact timestamps that the KLV streams are referring to within the 3 minute and 20 second video.

  


• C++/CLI — 0xc000007b (INVALID_IMAGE_FORMAT) with /clr option on

  9 mars 2015, par OverMachoGrande

  I’m trying to build a C++/CLI executable to which I statically link ffmpeg (libavcodec, libavformat, libavutil & swscale). It works fine if I build it normally (without /clr, so no CLR support), it works. However, when I add CLR support, it won’t start up with a 0xc000007b. A "Hello World" C++/CLI app runs fine, though.

  Supposedly the same thing happens with Boost::Threads, but since ffmpeg is pure C, I doubt it’s using Boost.

  My config :

  • Visual Studio 2008 Professional SP1
  • Windows XP Pro SP3 (x86)
  • .NET Framework 3.5 SP1

  Thanks,
  Robert