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• how to encode videos for the web and mobile phones using ffmpeg

  3 février 2012, par Arnar Yngvason

  I'm running a website where users can upload their videos and they are all trancoded to the same format (mp4 a.t.m.). Up until now I've been using zencoder (transcoding as a service). But I want to start transcoding the videos on my own server.

  What I would like to know is :

  • Which formats should I transcode to and which sizes are needed for the videos to play on most mobile phones ?
  • Do I actually need webm ?
  • Which is better : CRF or VRF ?
  • I would like the videos to have the same bitrate/quality as the originals. Can I set a max ?
  • Is there a max bitrate I should not exceed if I want to videos to play everywhere ?

  If someone would be so kind to write down the commands I need and explain how they work and what they do, I would be very thankful :)

• Color shift when encoding DNxHD QuickTime Video [closed]

  13 mai 2013, par Yani

  I have been tasked with developing the Editorial submission pipeline for an animated feature film project. Our studio is based on Windows 7 and the Editing team is using Avid Media Composer. We have decided to go with the "fast import" approach for bringing media into Avid. My tools take some frames and encode DNxHD QuickTime videos from them, then we write out an ALE document to assist with the batch importing of the delivery content. We call it the "fast import" approach because Avid only has to change the video container from MOV to MXF and it doesn't have to do any real encoding which is usually the time consuming part.

  I have tried comparing DNxHD QuickTime videos encoded using FFmpeg, RVIO and Nuke. The color in each video is different but the only one that matches the video created by importing frames directly into the Avid is the video generated by Nuke. I have heard the color shift may be caused by the way the Apple QuickTime libraries manage color on the Windows platform, is this true ? If so, how is Nuke able to produce the correct output ? Also, is there any way I can produce the correct output using FFmpeg or RVIO ?

• How to provide video streaming option for different formats on website

  3 avril 2014, par kami998

  In my website users can upload different video formats and i need to provide streaming for those formats (for example : mkv, avi, mp4, 3gp, wmv), but on web only mp4 format can be played by flash players.

  My videos are hosted on amazon s3 server while my webserver is on different location, what i do is receive stream from s3 and transmit to client, so what i need is to convert the video format to mp4 on the fly

  So, is there any possibility to perform this functionality ( i am using asp.net mvc webapi as streaming service )

  Any sort of help is appreciable...