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• ffmpeg concat loses audio after first clip only in browser, audio plays good on player like vlc etc

  1er octobre 2019, par Rajan Tpss

  i am trying to combine or concatenate audio file one after other like after concatenation of two audio files, both file will downloaded as a single file wheres audio will be played in a queue one after other.

  after some research i found the package FFmpeg i.e dealt with mp3,mp4 etc files.i tried to run FFmpeg commands in terminal but file is created and playing good on VLC but not playing accurately in browser.

  Some Commands tried by me in terminal are as follow :-

  ffmpeg -i "concat:a.mp3|b.mp3" -acodec copy output.mp3

  ffmpeg -f concat -i files.txt -c copy output.mp3

  ffmpeg -i a.mp3 -i b.mp3 -filter_complex "[0:v:0] [0:a:0] [1:v:0] [1:a:0] concat=n=2:v=0:a=1 [v] [a]" -map "[v]" -map "[a]" output.mp3

  ffmpeg -y -i "concat:a.mp3|b.mp3" -ar 22050 -ab 512 -b 800k -f mp4 -s 514*362 -strict -2 -c:a aac "OUTPUT.mp4"

  Library Link followed by me :- https://ffmpeg.org/ffmpeg-filters.html

  Note :- I am using Ubuntu based system

  file is created successfully from above commands and playing well on VLC player.

  where in browser first clip is playing well but after first clip browser stops. somehow second audio clip is not playing in browser. i don’t know why may be there is same kind of pattern error.

  if anyone can help, i shall be very thankful to him/her.

  Thanks

• pyglet_ffmpeg loads and plays video in script(.py) but not loading(media load) in executable

  24 février 2020, par Mahesh Dilip Salvi

  i am playing full screen video in pyglet application which just plays video as follows, the script(.py) file loads mp4 video(as mediaload) and plays it well (windowed/fullscreen) but after making it executable with pyinstaller command (pyinstaller -w -F .\videoPlay.py) it is not loading media.
  *i identified it with ’try-except’ block with help of ctypes.MessageBox
  Please assist me by checking following thing.

  import pyglet, pyglet_ffmpeg
  
  
  
  pyglet_ffmpeg.load_ffmpeg()
  
  
  
  vidPath = 'm2Vid.mp4'
  
  
  
  window = pyglet.window.Window() #fullscreen=True
  
  player = pyglet.media.Player()
  
  source = pyglet.media.StreamingSource()
  
  MediaLoad = pyglet.media.load(vidPath)
  
  player.on_player_eos = window.close
  
  
  
  player.queue(MediaLoad)
  
  player.play()
  
  
  
  @window.event
  
  def on_draw():
  
      if player.source and player.source.video_format:
  
          player.get_texture().blit(0,0)
  
  
  
  pyglet.app.run()

• FFplay only plays MPEG-DASH when in the same directory

  26 mars 2020, par M. Parker

  I’ve created a series of video segments using dashenc.c from ffmpeg’s libav on my windows machine. The mpd file is templated, so it’s fairly simple and it passes validation. The video plays, but only if I put ffplay in the same folder as all the files and use :

  ffplay -i manifest.mpd

  If I try to play from some other directory, or even the same directory using :

  ffplay -i c:\tmp\manifest.mpd

  or

  ffplay -i c:/tmp/manifest.mpd

  The attempt fails, producing this error :

  [dash @ 0000016ce0d69900] Failed to open an initialization section in playlist 0
  
  [dash @ 0000016ce0d69900] Error when loading first fragment, playlist 0
  
  C:/tmp/manifest.mpd: Invalid argument

  The mpd file :

  <?xml version="1.0" encoding="utf-8"?>
  
  <mpd xmlns="urn:mpeg:dash:schema:mpd:2011" profiles="urn:mpeg:dash:profile:isoff-live:2011" type="dynamic" minimumupdateperiod="PT500S" suggestedpresentationdelay="PT4S" availabilitystarttime="2020-03-23T14:54:16Z" publishtime="2020-03-23T14:54:25Z" timeshiftbufferdepth="PT4811H53M52.3S" minbuffertime="PT9.6S">
  
      <programinformation>
  
      </programinformation>
  
      <period start="PT0.0S">
  
          <adaptationset contenttype="video" segmentalignment="true" bitstreamswitching="true">
  
              <representation mimetype="video/mp4" codecs="avc1.42001e" bandwidth="5953124" width="720" height="480">
  
                  <segmenttemplate timescale="1000000" duration="5000000" availabilitytimeoffset="4.967" initialization="init-stream$RepresentationID$.m4s" media="media-stream$RepresentationID$-$Number%06d$.m4s" startnumber="1">
  
                  </segmenttemplate>
  
              </representation>
  
          </adaptationset>
  
      </period>
  
  </mpd>

  Adding in a BaseUrl element didn’t help ; my guess is I’m formatting it wrong. Any ideas what I might do to fix this ?