[MPlayer-users] How to create a "neutral sequence" at the beginning of a video track ?

André P. csosog at yahoo.fr
Fri Aug 7 17:30:44 CEST 2015

@ Nick KoretskyThank you for your quick answer.
- I exclude the re-encoding the {original file} in order to create a {neutral sequence} with the same caracteristics because the re-encoding would be too time consuming.
- Woukd I be able to collect all the caracteristics of the {original file} (and I am fat from that), I also exclude to create the {neutral sequence} with these caracteristics because I have no control on the {original files} (some come from emule, some from DDL).There a so many differant formats/codecs that the probabibilty that I miss the required one is too high.
      De : Nick Koretsky <nick_koretsky at ukr.net>
 À : mplayer-users at mplayerhq.hu 
Cc : André P. <csosog-at-yahoo.fr at ffmpeg.org> 
 Envoyé le : Vendredi 7 août 2015 16h25
 Objet : Re: [MPlayer-users] How to create a "neutral sequence" at the beginning of a video track ?
On Fri, 7 Aug 2015 12:16:03 +0000 (UTC)
André P. <csosog-at-yahoo.fr at ffmpeg.org> wrote:

> Is it possible to add a short "neutral sequence" (=short sequence of
> black -or white- stable image) at the begining or at the end of a video
> track with a command line program (ffmpeg, MEncoder, mkvtoolnix
> collection or other) ? I am looking for the video equivalent of the "pad"
> parameter of the sox audio editor but would accept a more complex
> procedure. 
> Notice that creating a "neutral sequence" with 
> ffmpeg -i {original file} -t {some seconds} -vf
> "fade=t=in:st=600:d=0.5" {neutral sequence} is not a satisfactory
> solution because the {neutral sequence} may not be concatenated to the
> {original file} because the caracteristics (codec,...) of the created
> {neutral sequence} usually differ from those of the {original
> file}. 

What you are asking for is impossible in a general case. To add
something to a video track without reencode depending on a file format and
codecs used you will need to at least encode your sequence with the same
codec as your file, at worst you would have to match exact codec
parameters. If you are asking if there is a commandline tool capable to
automatically analyze input file, encode desired sequence using the right
parameters and append it to input then i am not aware of anything even
remotely close.

  Nick Koretsky (nick.koretsky at gmail.com)

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