Recherche avancée

Sur d’autres sites (5367)

• Process to preview any video format inside the browser

  11 octobre 2017, par Nuzzob

  I have a simple app where the user can upload any video file to my server, come again later and stream the videos he uploaded.

  The thing is, depending on the browser he is using, he will be able to play it, or not.

  I was thinking of using ffmpeg when I receive a new video, in order to convert it into a format that will be readable by any browser.

  • Is it the best option that I can have ?
  • What is the most supported video format ? MP4 or WEBM ?
  • How does Youtube, for example, handle this problematic ?

  ( I’m aware that I could also use DASH to adapt the video resolution to the user bandwidth, but for now I do not focus on that part )

  If I effectively use ffmpeg, what’s the best command options I can use to make the conversion process faster without loosing to much of the video quality ? Is there a "magical ffmpeg command" that take any video in input and convert it into mp4 or webm ?

  I’m also afraid that, with big videos like 700mo or so, it will take so long to convert.

  Thank you !

• ffmpeg usage to encode a video to H264 codec format

  2 avril 2024, par goldenmean

  I have a *.mp4 video file(MPEG4 video codec) and I am trying to convert this to a H264 video codec format(raw h.264 format) using ffmpeg on Linux(Version - FFmpeg version SVN-r0.5.1-4:0.5.1-1ubuntu1, Copyright (c) 2000-2009 Fabrice Bellard,) using command line as shown below,

  



  ffmpeg -i input .mp4 output.h264 


  



  but I get an error saying -

  



  Unsupported codec for output stream #0.0


  



  Then when i try this option :

  



  ffmpeg -i input .mp4 -formats h264 output.h264 


  



  it still does not work, and gives -

  



  Seems stream 0 codec frame rate differs from container frame rate: 59.94 (5994/100) -> 29.97 (30000/1001)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Rapture.mp4':
  Duration: 00:02:06.44, start: 0.000000, bitrate: 26574 kb/s
    Stream #0.0(eng): Video: h264, yuv420p, 1920x1080, 29.97 tbr, 29.97 tbn, 59.94 tbc
    Stream #0.1(eng): Audio: aac, 48000 Hz, stereo, s16


  



  And then it prints out help on the formats which we get when we do ffmpeg -formats

  



  When I checked the help, ffmpeg -formats, I see below information related to H264 file format and codec :

  



  File format : 

DE h264            raw H.264 video format

Codecs:

D V D  h264         H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10


  



  My questions :

  



  


  1. How can I convert the video to a H264 encoded video (raw H264 video format)

  


  2. When I do ffmpeg -formats, I see many acronyms for the codecs supported, I see many acronyms before the codec name/type such as - D V D S E A, what do they stand for ?

  


  3. How to use the ffmpeg options -vcodec and -formats ?

  


  


• How to install libx265 for ffmpeg on Mac OSX

  20 octobre 2019, par Spencer

  I have tried multiple guides here (search for "Building libx265") and here with no success. Both times I made sure I uninstalled ffmpeg first, went through the guides, then ran

  brew install ffmpeg --with-fdk-aac --with-freetype --with-libass --with-libvpx --enable-libx265

  No matter what when I go to run a command like

  ffmpeg -i source.mkv -c:v libx265 test1.mkv

  I get the error :

  Unknown encoder 'libx265'

  Has anyone had success building libx265 for use with ffmpeg on OSX and can you please share how you did it ?

  P.S. I am running OSX 10.11.3