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• Is -vfilter not available on Debian 5 ?

  3 octobre 2011, par Kor

  I'm getting problems trying to make my website (done in PHP) work online.
  At a specific time, I need to upload a video and convert it, also scaling its dimensions. I use a call like this one :

  ffmpeg -y -i '/path/to/video.mp4' -f flv -ab 56 -ar 22050 -r 20 -vfilter "scale=704:-1" '/path/to/new/video.flv'

  It works offline on my computer (Ubuntu 10.10), but it doesn't do the same online (Debian Lenny 5.0). The response I get from the server is :

  [Mon Oct 03 15:48:56 2011] [error] [client 81.184.6.124] /servers/path/to/ffmpeg: unrecognized option '-vfilter'

  I have also tried with '-vf', but it just doesn't work at all. So my question is, am I doing it wrong, or is it that Debian unables video filters for some reason ?

  I give you some info about this server :

  Debian 5.0
  
  PHP: 5.2.6
  
  FFmpeg r11872+debian_0.svn20080206-18+lenny1
  
  libavutil   3212800
  
  libavcodec  3355136
  
  libavformat 3409664
  
  libavdevice 3407872

  EDIT : Oh my, I just saw it. No libavfilter installed. I'll tell you what their support tells me in a couple hours.

• Which voice recording format should rtpengine/ffmpeg create for desktop Windows PCs ?

  6 mars 2020, par NetHead

  I would like create some telephony voice recordings from the rtpengine open-source software package.

  In particular, rtpengine uses the ffmpeg(1) open-source utility to write the voice media.

  I note that ’WAV format’ is supported, specifically PCM_S16LE (PCM signed 16-bit little endian). MP3 is also supported.

  I believe that that WAV has a maximum recording length of 6.8 hours, but the recordings should be well below this length.

  Is WAV/PCM_S16LE a suitable format which can be easily played by an application readily available on desktop PCs ?

  That is, can this be played on desktop PCs without installing non-standard applications or codecs ?

  Which voice recording format should I use, that is WAV based, MP3 or otherwise ?

• MP4 moov tracking and moof box sequence append from multiple mp4 source on the fly

  15 juillet 2021, par Ashish Dave

  Use Case is streaming the media continuously via mp4 container on the fly by appending multiple encoded mp4 chunk ([moof mdat]+)

  


  Currently When we merge two video moof + mdat where first video’s ftyp + moov has been kept the same then the player is able to play the first video properly but second video it plays video first and audie later. Issue seems with tracking information in moof.

  


  We want to provide an mp4 file as an endpoint for streaming video where we will append multiple mp4 video’s moof + mdat to the endpoint one after another. MP4 Endpoint can have a 10 hours of duration which include 1-2 minutes of video’s moof + mdat.

  


  Doubts are,

  


  How to manage the moov header to keep track of moof + mdat
How to manage the moof header for continuous streaming (or if there anyway to keep it unmodified)

  


  Note : Currently We are using all the fragmented h264 codec video with same fps rate, height, width and same audio codec for all the media content