Recherche avancée

Sur d’autres sites (6499)

• ffplay - how to have video and audio waveform [duplicate]

  19 février 2018, par francis

  This question already has an answer here :

  • ffplay / ffmpeg setup table with audio and video filters
    
    1 answer
    

  I’ve been trying out various commands trying to figure out how to have a stack of video and audio waveform according to : https://trac.ffmpeg.org/wiki/FancyFilteringExamples#waveform

  Video only :

  ffplay -i abc.mp4 -vf "split[a][b];[a]waveform=e=1,split=1[c];[c]crop=in_w:16:0:0,lutyuv=y=val:v=180[high]; [b][high]vstack=2"

  Audio only :

  ffplay -f lavfi 'amovie=april.flac,asplit=2[out1][a]; [a]showwaves=s=640x240[waves]; [waves] vstack[out0]'

  But there isn’t any that combines and shows the top half as video and bottom half as the audio waveform. Is it possible ?

• H.264 is patented. What happens when developing a commercial app in Android using H264 codec in ffmpeg ? [closed]

  26 mai 2013, par user1914692

  H.264 is patented.

  In countries where patents on software algorithms are upheld, vendors
  and commercial users of products that use H.264/AVC are expected to
  pay patent licensing royalties for the patented technology[14] that
  their products use.

  What happens when developing a commercial app in Android using H264 codec in ffmpeg ?

  Here there are two situations :
  (1) decode online video stream, and display it.

  (2) encode contents to a video file using H.264.

  [Update :]
  From what I googled, here are some simple pieces of information :
  (1) decode : free
  (2) encode : H.264 encoded internet video that is free to end users will never be charged royalties.
  On August 26, 2010 MPEG LA announced that H.264 encoded internet video that is free to end users will never be charged royalties. See Wiki H.264
  (3) encode : for other situations except the one in (2), I guess it might be for commercial use.

  For more, see Ref : "Know your rights : H.264, patent licensing, and you" 2010/05/04

• ffmpeg, HLS options, ffmpeg components for dummies ? [closed]

  10 juin 2013, par Vetal

  I am trying to make some HLS encoding with ffmpeg

  After playing a lot (in Ubuntu 12.04) with ffmpeg I realized I do not understand basic questions.

  How to make a ffmpeg "by the book" ?

  I've started a "sudo apt-get install ffmpeg"

  I finished with a manual install :

  http://ffmpeg.org/trac/ffmpeg/wiki/How%20to%20quickly%20compile%20FFmpeg%20with%20libx264%20%28x264,%20H.264%29

  Latter needed a following command to get rid of build error, where I spent quite some time with :

  sudo apt-get remove ffmpeg x264 libx264-dev

  So, now I've got to the documentation for HLS : http://ffmpeg.org/ffmpeg-all.html#hls-2

  Trying to run some stuff :

  ffmpeg -i 3.mp4 hls.m3u8

  Error : Unable to find a suitable output format for 'hls.m3u8'

  ffmpeg -i 3.mp4 -hls_time 10 hls.m3u8

  Error :
  Unrecognized option 'hls_time'
  Failed to set value '10' for option 'hls_time'

  Anyway, looks like an options specified in different formats, e.g. 'vbsf' vs 'v:bsf', -vcodec and -v:c, etc. etc. Like there are few alternative versions

  After starting with it some time ago, I feel more pessimistic now like I missed some fundametals. Any Ideas for the things above ?

  Thank you