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• avcodec/ppc/fdctdsp : use more accurate constants

  13 novembre 2015, par Ganesh Ajjanagadde

  avcodec/ppc/fdctdsp : use more accurate constants
  Whoever wrote this stuff had a pretty bad libm - digits differ pretty
  
  quickly.
  Reviewed-by : Ronald S. Bultje <rsbultje@gmail.com>
  
  Signed-off-by : Ganesh Ajjanagadde <gajjanagadde@gmail.com>
  

  • [DH] libavcodec/ppc/fdctdsp.c

• ffmpeg mp4 shows blurred frames after seeking in the video with internet explorer

  21 février 2014, par Larzzz

  I have a question regarding JWPlayer 5, IE and video encoding.
  Basicly I use a Wowza server to stream my files. This works on all devices (windows, iOS and Android).
  However when i play it in Internet Explorer, it behaves strange.
  It plays fine, and the entire movie looks good without any issues. But when I seek in the video, it shows a line in the center of my video, like if the previous frame is still showing some part, and it refreshes after a few frames move in the video.
  The frames itself are not broken, as if i just play the video without seeking it all looks good.
  This does not happen in Chrome, Firefox or Safari, neither does this happen on android & iOS.
  I've tested this with JW 6 as well, and it shows the same results for IE.

  Altough it's showing fine on other browsers, I still believe it's an issue with encoding, as other videos do not show this behavior.

  Example viewable here : http://www.mobileevolution.be/standardcode-withsmil.html

  The FFMPEG code i use to convert any file (.avi in this case) to an MP4 :

  "ffmpeg.exe" -i "%1" -vcodec libx264 -strict experimental -c:a aac -profile:v baseline -level 3 -movflags faststart -bufsize 1000k -tune zerolatency -b:v 1000k -minrate 600k -maxrate 1500k "%5%71000k.mp4"

  the %1, %5 and %7 are variables i send with a script.

  I have tried various options, but could not figure out what the problem is.
  I have also tried converting with handbrake, but this shows similar results.

  My questions are :
  Has anyone seen this before ?
  Does anyone know a solution ?
  What's wrong with my FFMPEG settings ?

  Thanks for any help,
  Grts

  EDIT
  pictures :
  http://www.mobileevolution.be/foto1.jpg
  http://www.mobileevolution.be/foto2.jpg
  console output :
  http://www.mobileevolution.be/consoleoutput.txt

• AWS Lambda tmp disk limit with ffmpeg

  21 avril 2022, par Almaju

  I am using AWS Lambda to render videos using ffmpeg. It is a basic function that downloads external clips, merges those, then uploads the result to S3.

  


  This function needs to be able to scale quickly because I need to generate a lot of videos in a short time period.

  


  The problem is that I reach the /tmp disk limit of 512MB because the same lambda environment is reused by the different requests. I have increased that memory limit to temporarily solve the problem but it does not feel scalable.

  


  I have looked into EFS but the requirement to use a VPC and a NAT to have internet access sounds really heavy for my simple needs.

  


  Is there a way to output the result of ffmpeg directly in S3 (thus not needing the temporary folder) ? Or perhaps force to respawn a clean lambda environment if the memory is about to be full ?