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• Why Do Some of the Codecs in FFMPEG's Supported Codec List Show "encoders :" or "decoders :" in Parenthesis ?

  4 mai 2020, par spaceman

  If you open the Command Prompt, and run ffmpeg -codecs,
  
you will get a long list of Codecs that FFMPEG supports.

  



  Here's a small sample of the list :

  



   DEV.L. h261                 H.261
 DEV.L. h263                 H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2
 D.V.L. h263i                Intel H.263
 DEV.L. h263p                H.263+ / H.263-1998 / H.263 version 2
 DEV.LS h264                 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (encoders: libx264 libx264rgb)
 D.V.LS hevc                 H.265 / HEVC


  



  Now If you briefly go over the whole list,
  
you see that most Codecs in this list appear with their Name and Description,
  
but some of the Codecs also include parenthesis in the Description, and in the parenthesis,
  
they specify "encoders :" or "decoders :".

  



  For example :

  



  1)

  



   DEV.LS h264                 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (encoders: libx264 libx264rgb)


  



  2)

  



   DEVILS jpeg2000             JPEG 2000 (decoders: jpeg2000 libopenjpeg) (encoders: jpeg2000 libopenjpeg)


  



  3)

  



   DEV.L. msmpeg4v3            MPEG-4 part 2 Microsoft variant version 3 (decoders: msmpeg4) (encoders: msmpeg4)


  



  4)

  



   DEA.L. aac                  AAC (Advanced Audio Coding) (encoders: aac libvo_aacenc)


  



  5)

  



   DEA.L. amr_nb               AMR-NB (Adaptive Multi-Rate NarrowBand) (decoders: amrnb libopencore_amrnb) (encoders: libopencore_amrnb)
 DEA.L. amr_wb               AMR-WB (Adaptive Multi-Rate WideBand) (decoders: amrwb libopencore_amrwb) (encoders: libvo_amrwbenc)


  



  My question :

  



  Why do some Codecs have those parenthesis, specifying Encoders/Decoders,
  
while other (in fact : most) codecs don't have these parenthesis ?

  


• How can i insert 10 seconds of silent audio(null audio without images or video or black video) into video repeat every 15 seconds with ffmpeg ?

  1er septembre 2018, par Adam Estel

  I have a clip video.mp4 . How can i insert 10 seconds of only silent audio into this clip repeat every 15 seconds until the end of this clip with ffmpeg ?
  I know anullsrc is an audio so i can’t use overlay filter. I research on google for a while but the only option i have is gte(mod(t,15),10)).

  Thank you.

• FFmpeg licence requirements when not distributing [closed]

  15 juin 2020, par Dodu

  I am making a website that uses FFmpeg, and by extension libx264. The website takes a video and adds filters etc to it, then serves that new video to the user.

  



  There are various answers about distributing libx264 (and others) as part of a commercial product such as :

  



  Can I use FFmpeg in a commercial product ?

  



  Since I am generating content using the library, but not distributing the library itself, I'm not sure where this leaves me.

  



  Do I need a license to libraries ? Or because there is no distribution, are licenses generally not needed ?

  



  Any advice/links/other resources that may be helpful would be greatly appreciated.