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• Merge commit '95f1004bdfdf2d26c330c1d4b7c4ac9352d60b18'

  20 mai 2017, par Clément Bœsch

  Merge commit '95f1004bdfdf2d26c330c1d4b7c4ac9352d60b18'
  * commit '95f1004bdfdf2d26c330c1d4b7c4ac9352d60b18' :
  
    dashenc : add mandatory id to AdaptationSet and Period in manifest
  Merged-by : Clément Bœsch <u@pkh.me>
  

  • [DH] libavformat/dashenc.c

• MPEG-DASH MPD file not playing correctly

  24 juin 2017, par CMOS

  So I am working on generating a very simple MPD manifest file for my MPEG-DASH videos and I cannot figure out what is wrong. Here is my current manifest file

  <?xml version="1.0" ?>
  
  <mpd xmlns="urn:mpeg:dash:schema:mpd:2011" minbuffertime="PT1.500S" type="static" mediapresentationduration="PT0H9M21.795S" maxsegmentduration="PT0H0M1.001S" profiles="urn:mpeg:dash:profile:isoff-on-demand:2011">
  
      <period>
  
          <baseurl>https://mysite/uploads/sources/resolution_640/bitrate_1400/</baseurl>
  
          <adaptationset mimetype="video/mp4">
  
              <contentcomponent contenttype="video"></contentcomponent>
  
              <representation bandwidth="1400000">
  
                <segmentlist duration="119">
  
                  <initialization sourceurl="https://mysite/uploads/sources/resolution_640/bitrate_1400/640x360_1400Kpbs_0.mp4"></initialization>
  
                  <segmenturl media="https://mysite/uploads/sources/resolution_640/bitrate_1400/640x360_1400Kpbs_1.mp4"></segmenturl>
  
                  <segmenturl media="https://mysite/uploads/sources/resolution_640/bitrate_1400/640x360_1400Kpbs_2.mp4"></segmenturl>
  
                  <segmenturl media="https://mysite/uploads/sources/resolution_640/bitrate_1400/640x360_1400Kpbs_3.mp4"></segmenturl>
  
                </segmentlist>
  
              </representation>
  
          </adaptationset>
  
      </period>
  
  </mpd>

  This MPD file validates using every validator I can find. The urls for the segments are obscured for security reasons but they are all open, public and viewable individually. But when I try to run the manifest file, depending on the player I get. "No supported source found within manifest" or simply nothing happens.

  Any idea how this could be wrong ? I am currently using media url’s as absolute paths but I have also tried paths relative to the BaseURL with no luck. Any info on how I can make a very simple MPEG-Dash manifest structure would be great. I am using FFMPEG to split my video up into 150 frame segments. Thanks !

• How to detect the silence at the end of an audio file ?

  1er janvier 2024, par Ali Akber

  I am trying to detect silence at the end of an audio file.
  
I have made some progress with ffmpeg library. Here I used silencedetect to list all the silences in an audio file.

  



  ffmpeg -i audio.wav -af silencedetect=n=-50dB:d=0.5 -f null - 2> /home/aliakber/log.txt


  



  Here is the output of the command :

  



  —With silence at the front and end of the audio file—

  



  [silencedetect @ 0x1043060] silence_start: 0.484979
[silencedetect @ 0x1043060] silence_end: 1.36898 | silence_duration: 0.884
[silencedetect @ 0x1043060] silence_start: 2.57298
[silencedetect @ 0x1043060] silence_end: 3.48098 | silence_duration: 0.908
[silencedetect @ 0x1043060] silence_start: 4.75698
size=N/A time=00:00:05.56 bitrate=N/A


  



  —Without silence at the front and end of the audio file—

  



  [silencedetect @ 0x106fd60] silence_start: 0.353333
[silencedetect @ 0x106fd60] silence_end: 1.25867 | silence_duration: 0.905333
[silencedetect @ 0x106fd60] silence_start: 2.46533
[silencedetect @ 0x106fd60] silence_end: 3.37067 | silence_duration: 0.905333
size=N/A time=00:00:04.61 bitrate=N/A


  



  But I want something more flexible so that I can manipulate the output and do further task depending on the result.
  
I want to get the output something like true or false. If there is a certain period of silence exists at the end of the audio file it will return true and false otherwise.

  



  Can someone suggest me an easy way to achieve this ?