Recherche avancée

Sur d’autres sites (15305)

• Can I detect duplicated videos using ffmpeg ?

  28 décembre 2020, par Tobias

  Is it possible to detect duplicate videos (.mp4 files) using ffmpeg (or similar tools) ?

  


  There are around 3000 videos in my file system, some of them twice (since these are automatically downloaded by a bot from various sources). So it can happen that these differ a little from the video / audio quality.

  


  My first idea now would be to render the videos to a quality that is consistent and store the MD5 hash of the file in the database. There I would check for duplicate hashes.

  


  Is this the right approach or does anyone have an idea how I could best implement this ?

  


• FFmpeg segment desktop capture and send over http

  18 décembre 2014, par static

  I’m trying to capture the desktop video and segment it in order to send it over http to my node.js server, where I want to encode it to multiple bit-rates in order to serve it to clients for live streaming.
  The video has to be received in segments in order to create the manifest for live streaming, because i’m trying to use DASH, and to play the video on the client side using dash.js.

  The problem is that i can’t seem to be able to segment the video properly when i’m sending it to the server.

  This is the ffmpeg command that i’ve tried :

  ffmpeg -rtbufsize 1500M -f dshow -r 10 -i video="UScreenCapture"
  
  -vcodec libvpx -crf 10 -quality good -cpu-used 3 -b:v 1000k -qmin 10 -qmax 42  -
  
  threads 2 -vf scale=-1:480 -bufsize 1500 -flags -global_header -map 0 -f stream_
  
  segment -segment_time 2 -segment_format webm -  http://localhost:3000/stream/22

  I’ve managed to send it over http without segmenting the video, but on the server side i need to receive segments that have a duration of 2 seconds so that i can create the manifest.

  Also processing the video on the server side is also going to be done using ffmpeg(fluent ffmpeg module).
  I’m open to any suggestions.

• MPEG-DASH create initialization segment

  3 novembre 2014, par static

  I’m segmenting the video capture of the desktop using ffmpeg -segment and sending them over network in order to be served to clients and to be played using dash.js. The problem is that the player is searching for the initialization segment and i don’t seem to be able to figure out how to create it.
  I create the segments using this ffmpeg command :

  ffmpeg -rtbufsize 1500M -f dshow -r 15 -i video="UScreenCapture"
  
  -flags +global_header -vcodec libvpx -crf 10 -quality good -keyint_min 15 -g 15
  
  -cpu-used 3 -b:v 1000k -qmin 10 -qmax 42  -threads 2 -vf scale=-1:480 -bufsize 1
  
  500 -map 0 -f stream_segment -segment_time 2 -segment_format webm http://localho
  
  st:3000/stream/22/%03d

  The manifest that i create for the stream looks something like this :

  <mpd xmlns="urn:mpeg:dash:schema:mpd:2011" type="dynamic" availabilitystarttime="2014-06-19T07:47:40.079Z" minbuffertime="PT0S" profiles="urn:mpeg:dash:profile:isoff-live:2011" suggestedpresentationdelay="PT40S" maxsegmentduration="PT2.000S" minimumupdateperiod="PT1000M">
  
  <period bitstreamswitching="true" start="PT0S">
  
  <adaptationset mimetype="video/webm" segmentalignment="true" startwithsap="1" maxwidth="1280" maxheight="720" maxframerate="15">
  
  <contentcomponent contenttype="video"></contentcomponent>
  
  <segmenttemplate presentationtimeoffset="0" timescale="90000" media="$Number$/" duration="180000" startnumber="0"></segmenttemplate>
  
  <representation width="853" height="480" framerate="15" bandwidth="1000000" codecs="vp8"></representation>
  
  </adaptationset>
  
  </period>
  
  </mpd> 

  The player debugging mode prints the following things :

  Getting the request for time: 0 dash.all.js:2073
  
  Index for time 0 is 0 dash.all.js:2073
  
  Waiting for more video buffer before starting playback. dash.all.js:2073
  
  BufferController video seek: 0 dash.all.js:2073
  
  Marking a special seek for initial video playback. dash.all.js:2073
  
  Start searching for initialization. dash.all.js:2073
  
  Perform init search: stream/22/ dash.all.js:2073
  
  Getting the request for time: 0 dash.all.js:2073
  
  Index for time 0 is 0 dash.all.js:2073
  
  Data changed - loading the video fragment for time: 0 dash.all.js:2073
  
  Getting the request for time: 0 

  How can i create the initialization segment for the generated segments ? I can’t seem to be able to get it to work.