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    9 février 2011, par

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Sur d’autres sites (7943)

  • rtp mpg stream using jrtplib occurred error "illegal timestamp unit"

    13 avril 2013, par socket

    I wanna code rtp video stream sender and use VLC to play it in the LAN. I just have a mpeg4 file "a.mpg". And in my opinion, jrtplib can pack the packed well, so I think I can use sendPacket() function directly to send the mpg file. code below :

    #include 
    
#include 
    
#include 
    
#include 
    
#include 
    
#include 
    
#include 
    
#include <iostream>
    
#include
    

    
using namespace jrtplib;
    
using namespace std;
    
int main()
    
{
    
RTPSession s;
    
RTPSessionParams sparam;
    
s.SetTimestampUnit(160.0/104857.0);//~
    
RTPUDPv4TransmissionParams tparam;
    
tparam.SetPortbase(9000);
    
int status=s.Create(sparam,&amp;tparam);
    
if(status&lt;0)
    
{
    
    cerr&lt;&lt;"error 1"&lt;/~
    
s.SetDefaultMark(false);
    
s.SetDefaultTimestampIncrement(160);//~~
    

    
unsigned char buf[160];
    
FILE*f=fopen("a.mpg","rb");
    
while(!feof(f))
    
{
    
    fread(buf,1,160,f);
    
    RTPTime delay(0.02);//~
    
    bool ret=false;
    
    status=s.SendPacket(buf,160);
    
    if(status&lt;0)
    
    {
    
        cerr&lt;&lt;"error 3"&lt;code></iostream>

    Then, I compile it :

     g++ jrtpsend.cpp -ljrtp -I /usr/local/include/jrtplib3

    After that, I run the program but error occurred :

    kl@kl-ubuntu:~/code/RTP$ ./a.out 
    
error 1
    
Speficied an illegal timestamp unit for the the RTCP packet builder

    Actually, I didn't know timestamp exactly. When I use ffplay to play a.mpg showing that :

    Input #0, mpeg, from &#39;a.mpg&#39;:q=    0KB vq=    0KB sq=    0B f=0/0   
    
Duration: 00:01:00.69, start: 0.529089, bitrate: 556 kb/s
    
Stream #0:0[0x1e0]: Video: mpeg1video, yuv420p, 640x480 [SAR 239:182 DAR 478:273],   104857 kb/s, 25 fps, 25 tbr, 90k tbn, 25 tbc
    
Stream #0:1[0x1c0]: Audio: mp2, 44100 Hz, stereo, s16p, 128 kb/s

    2.46 A-V : -0.003 fd= 7 aq= 2KB vq= 33KB sq= 0B f=0/0

    So, I use the data 104857kb/s in the code (setTimestampUnit()), but I have no idea whether I use it correctly.
    All in all, please give me some suggestion how to run the program well or ...
    Best regards :-)

  • "File doesn't exist" - streamio FFMPEG on screenshot after create method

    3 mai 2013, par dodgerogers747

    I have videos being directly uploaded to S3 using Amazon's CORS configuration. Videos are uploaded via a dedicated S3 form, once they have been uploaded successfully the URL of the video is appended to the @video.file hidden_field via javascript and then the video saves.

    I can't get this after_save method to work which takes a screenshot of the video and saves it to S3 via carrierwave after the video has been saved as a rails object. ( It was previously working using a carrierwave video upload instance )

    It errors out withErrno::ENOENT - No such file or directory - the file &#39;http://bucket-name.s3.amazonaws.com/uploads/video/file/secure-random-hex/video_name.m4v&#39; does not exist: I have tried running this method as a class method to call it from the console but it always comes back with the same error, even though the video exists.

    My bucket is set to public, read and write. How come it doesn't think the file exists ?

    If anyone needs more code just shout, thanks in advance.

    application trace

    Started POST "/videos" for 127.0.0.1 at 2013-05-03 10:48:07 -0700
    
Processing by VideosController#create as JS
    
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"MAHxrVcmPDtVIMfDWZBwL0YnzaAaAe1PTGip5M4OVoY=", "video"=>{"user_id"=>"5", "file"=>"http://bucket-name.s3.amazonaws.com/uploads/video/file/secure-random-hex/video.m4v"}}
    
  User Load (0.3ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 5 LIMIT 1
    
   (0.1ms)  BEGIN
    
  SQL (20.5ms)  INSERT INTO `videos` (`created_at`, `file`, `question_id`, `screenshot`, `updated_at`, `user_id`) VALUES (&#39;2013-05-03 17:48:07&#39;, &#39;http://teebox-network.s3.amazonaws.com/uploads/video/file/secure-random-hex/video.m4v&#39;, NULL, NULL, &#39;2013-05-03 17:48:07&#39;, 5)
    
   (44.0ms)  ROLLBACK
    
Completed 500 Internal Server Error in 71ms
    

    
Errno::ENOENT - No such file or directory - the file &#39;http://teebox-network.s3.amazonaws.com/uploads/video/file/secure-random-hex/video.m4v&#39; does not exist:
    
  (gem) streamio-ffmpeg-0.9.0/lib/ffmpeg/movie.rb:10:in `initialize&#39;
    
  app/models/video.rb:25:in `new&#39;
    
  app/models/video.rb:25:in `take_screenshot&#39;

    video.rb

      attr_accessible :user_id, :question_id, :file, :screenshot
    
  belongs_to :question
    
  belongs_to :user
    

    
  default_scope order(&#39;created_at DESC&#39;)
    

    
  after_create :take_screenshot
    

    
  mount_uploader :screenshot, ImageUploader
    

    
  validates_presence_of :user_id, :file
    

    
  def take_screenshot
    
    FFMPEG.ffmpeg_binary = &#39;/opt/local/bin/ffmpeg&#39;
    
    movie = FFMPEG::Movie.new("#{self.file}")
    
    self.screenshot = movie.screenshot("#{Rails.root}/public/uploads/tmp/screenshots/#{File.basename(self.file)}.jpg", seek_time: 2 )
    
    self.save!
    
  end

    videos/_form.html.erb

    <form action="http://bucket-name.s3.amazonaws.com" data-remote="true" class="direct-upload" enctype="multipart/form-data" method="post">
    
  <input type="hidden" />
    
  <input type="hidden" value="ACCESS_KEY" />
    
  <input type="hidden" value="public-read" />
    
  <input type="hidden" />
    
  <input type="hidden" />
    
  <input type="hidden" value="201" />
    
  <input type="file" />
    
</form>
    

    
&lt;%= form_for @video, html: { multipart: true, id: "new_video" }, remote: true do |f| %>
    
        &lt;% if @video.errors.any? %>
    
    <div>
    
    <h2>&lt;%= pluralize(@video.errors.count, "error") %> prohibited this post from being saved:</h2>
    

    
  <ul>
    
    &lt;% @video.errors.full_messages.each do |msg| %>
    
        <li>&lt;%= msg %></li>
    
        &lt;% end %>
    
    </ul>
    
    </div>
    
&lt;% end %>
    

    
    &lt;%= f.hidden_field :user_id, value: current_user.id %>
    
    &lt;%= f.hidden_field :file %><br />
    

    
    &lt;% end %>

    ImageUploader

    class ImageUploader &lt; CarrierWave::Uploader::Base
    

    
  include CarrierWave::RMagick
    

    
   include Sprockets::Helpers::RailsHelper
    
   include Sprockets::Helpers::IsolatedHelper
    

    
  storage :fog
    

    
  before :store, :remember_cache_id
    
  after :store, :delete_tmp_dir
    

    
    def cache_dir
    
      Rails.root.join(&#39;public/uploads/tmp/&#39;) 
    
    end
    

    
    def remember_cache_id(new_file)
    
      @cache_id_was = cache_id
    
    end
    

    
    def delete_tmp_dir(new_file)
    
      if @cache_id_was.present? &amp;&amp; @cache_id_was =~ /\A[\d]{8}\-[\d]{4}\-[\d]+\-[\d]{4}\z/
    
        FileUtils.rm_rf(File.join(root, cache_dir, @cache_id_was))
    
      end
    
    end
    

    
  process resize_and_pad: [306, 150, &#39;#000&#39;]
    

    
  def store_dir
    
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
    
  end
    

    
  def extension_white_list
    
    %w(jpg)
    
    # %w(ogg ogv 3gp mp4 m4v webm mov)
    
  end

  • j2k/jpeg2000 : split data pointer in int & float.

    30 mai 2013, par Michael Niedermayer
    j2k/jpeg2000 : split data pointer in int & float.

    This fixes a TODO item and unifies both decoders structures
    
It also fixes undefined behavior due to aliasing violations
    

    I choose 2 fields instead of a union because mistakely using the
    
wrong type with a union will lead to hard to debug "wrong output"
    
while with 2 fields mistakely using the wrong type will crash
    
with a null pointer derefernce which is much easier to debug
    

    Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
    • [DH] libavcodec/j2k.c
    • [DH] libavcodec/j2k.h
    • [DH] libavcodec/j2kdec.c
    • [DH] libavcodec/j2kenc.c
    • [DH] libavcodec/jpeg2000.c
    • [DH] libavcodec/jpeg2000.h
    • [DH] libavcodec/jpeg2000dec.c

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