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• a gcc strange ld error when compile some ffmpeg application, libvorbisenc package not found

  8 mai 2016, par ldkxingzhe

  I follow the ffmpeg tuorial, and install ffmpeg via ppa

  But when I compiled the tuorial02.c, I got gcc error :

  /usr/bin/ld : /opt/ffmpeg/lib//libavcodec.a(libvorbisenc.o) : undefined reference to symbol ’vorbis_encode_setup_vbr’

  //usr/lib/x86_64-linux-gnu/libvorbisenc.so.2 : error adding symbols : DSO missing from command line
  collect2 : error : ld returned 1 exit status

  My compile command is :

  gcc -I /opt/ffmpeg/include/ -L /opt/ffmpeg/lib/  -o tutorial02 tutorial02.c -lavformat -lavcodec -lswscale `sdl-config --cflags --libs`  -lpthread -lz -lm -ldl

  I have searched the reason for hours. I can’t solve this. Can anyone help me ?

  Added I have add -lvorbisenc to the end. the error is lib not found. and libvorivisenc2 has been install. so this question is not a duplicate of Strange linking error : DSO missing from command line

  And My OS is Linux mint 17.3

• upload video on local host

  20 avril 2017, par chan jack

  when i upload video on local host have error #Unable to detect any supported library#

  @internal_information = InternalInformation.new(internal_information_params)

  if @internal_information.update(internal_information_params)

  respond_to do |format|

  this is my code below

  Model

  class InternalInformation < ApplicationRecord
  
    has_attached_file :video , styles: {
  
                                        :medium => { :geometry => "640x480", :format => 'mp4' },
  
                                        :thumb => { :geometry => "100x100#", :format => 'jpg', :time => 10 }
  
                                    }, :processors => [:transcoder]
  
    validates_attachment_content_type :video, content_type: /\Avideo\/.*\Z/
  
  end

  Controller

  def create
  
  @internal_information = InternalInformation.new(internal_information_params)
  
  
  
  respond_to do |format|
  
    if @internal_information.save
  
      format.html { redirect_to @internal_information, notice: 'Internal information was successfully created.' }
  
      format.json { render :show, status: :created, location: @internal_information }
  
    else
  
      format.html { render :new }
  
      format.json { render json: @internal_information.errors, status: :unprocessable_entity }
  
        end
  
      end
  
    end
  
  
  
    # PATCH/PUT /internal_informations/1
  
    # PATCH/PUT /internal_informations/1.json
  
    def update
  
  respond_to do |format|
  
    if @internal_information.update(internal_information_params)
  
      format.html { redirect_to @internal_information, notice: 'Internal information was successfully updated.' }
  
      format.json { render :show, status: :ok, location: @internal_information }
  
    else
  
      format.html { render :edit }
  
      format.json { render json: @internal_information.errors, status: :unprocessable_entity }
  
        end
  
      end
  
    end

  Show

  <%= javascript_include_tag 'swfobject' %>
  
  <p>&lt;%= notice %></p>
  
  
  
  <p>
  
    <strong>Title:</strong>
  
    &lt;%= @internal_information.Title %>
  
  </p>
  
  
  
  <p>
  
    &lt;%= video_player({:file => @internal_information.video.url(:medium), :image => @internal_information.video.url(:thumb)}) %>
  
  </p>
  
  
  
  &lt;%= link_to 'Edit', edit_internal_information_path(@internal_information) %> |
  
  &lt;%= link_to 'Back', internal_informations_path %>

• ffmpeg read filesize

  23 juin 2023, par assaf

  I use ffmpeg to convert a video file uploaded via an ASPX web page.
ffmpeg conversion works fine.

  



  I want to provide the end-user a progress bar.
So I placed an updatPanel on my web page and tried to read the file size ...

  



  

  • using fileinfo : ffmpeg freeze

  


  • using [process.start()] cmd.exe /c dir : ffmpeg freeze

  


  • using filestream : error ->> file is used by another process

  


  • using ffmpeg -i X Y 2> log.txt : log is created only when conversion completed

  


  



  Whats the proper/working way to do this ?