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• Video upload with carrierwave-video on Rails 4

  15 juin 2017, par MJRLGUE

  it’s been a while I am fighting to play a video in my rails app.

  I am using carrierwave-video, OS : Windows 10 64bits, to stream/show a video in user posts.

  Here is what I did :

  the file video_uploader.rb :

  class VideoUploader < CarrierWave::Uploader::Base
  
  
  
    include CarrierWave::Video
  
    storage :file
  
    def store_dir
  
      "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  
    end
  
  end

  in the file : _post.html.erb :

  with this line of code : <%= video_tag post.video_url :controls =>true %> I get a blank box with the size of the video.
  and I tried this too and still doesn’t work : <%= video_tag post.video.url if post.video? %>

  I tried ffmpeg too, I installed ffmpeg in my pc and I did include : process encode_video: [:mp4, callbacks: { after_transcode: :set_success } ] in video_uploader.rb file and I get this form error message :

  Video Failed to transcode with FFmpeg. Check ffmpeg install and verify
  video is not corrupt or cut short. Original error : ArgumentError

  Any suggestions please ?

• syncing video thumbnail frames with source video

  12 octobre 2020, par bigless

  We are trying to make video preview for seek bar. One approach is to make tons of images like Youtube does. We chose second one - 160x90(*) preview video without sound with fps limited to max 4 (250ms, based on duration) - one file with native seek sounds good to me.

  


  This is current cmd we use :

  


  ffmpeg -y -i $source$ -vf scale=$width$:$height$ -an -sn -r $fps$ -vcodec libx264 -x264-params keyint=$keyframe_interval$:scenecut=0  


  


  The idea is that browser is able to fetch whole video preview (<10MB) so there is priority to minimize the size. It seems that html5 video player is able to seek to and decode other than keyframes so we set keyframe interval to duration of video with limit of max 384(1920/5px) for best compression ratio.

  &#xA;

  The issue we are facing is frame sync. When I hover seek bar, video preview shows frame that actually lacks 1-2sec behind hovered time. Does anyone got explanation and possibly fix for this ? Is there some time deviation when player decodes frame instead of showing keyframe ?

  &#xA;

• Convert video from FFMPEG than video is rotated [duplicate]

  25 octobre 2016, par user7050166

  This question already has an answer here :

  • video captured from iphone gets rotated when converted to .mp4 using ffmpeg
    
    8 answers
    

  I have created one Application API, in this Application API When i have upload video from file manager than video is rotated but when i have capture and direct upload than video is perfect work.

  i have use this command transpose=1 but capture video is rotated 90 degree when upload and if i have remove this command than file manager video is rotated.

  so please give me solutions.

  /usr/bin/ffmpeg -i video.mp4 -i watermark.png -filter_complex 'overlay=10:10' -s 640x1280 -b 512k -vcodec mpeg1video -acodec copy -vcodec h264 -acodec aac -strict -2 output_video.mp4

  file manager upload video is auto rotated on 270 degree, i have not use any rotated command but capture video is work perfect.