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• FFMPEG Audio stream/layer and SRT from one mkv to an other

  13 juillet 2022, par kormorfor

  I have an FFMPEG question for you !

  


  Problem :

  


  I have 2 files(x265)

  


  01.mkv with multiple audio steams and multiple subtitles (with exactly named layers)

  


  02.mkv with multiple audio steams and multiple subtitles (with exactly named layers)

  


  I would like to add specific audio layer(GER) and specific subtitle(GER)
from 02.mkv to 01 mkv at the same time if it is possible.
(The metadata positions almost always random in file 02.mkv so I can't say it is "-map 0:s:2 for ger subtitle"...)

  


  I have already searched and tried multiple solutions ...

  


  This kind of worked with multiple steps but loses audio and subtitle metadata(Title) during process.

  


  German audio layer extract from 02.mkv to aac

  


  ffmpeg -i 02.mkv -map 0:a:m:language:ger 02.aac


  


  German subtitle layer extract from 02.mkv to srt

  


  ffmpeg -i 02.mkv -map 0:s:m:language:ger 02.srt


  


  Adding extracted audio to 01.mkv

  


  ffmpeg -i 01.mkv -i 02.aac -map 0 -map 1 -codec copy outputfinall_1.mkv


  


  Adding extracted srt to 01.mkv none of this works

  


  1.)

  


  ffmpeg -i 01.mkv -i 02.srt -c copy -c:s mov_text outputfinall_2a.mkv


  


  BUG : Subtitle encoding currently only possible from text to text or bitmap to bitmap

  


  2.)

  


  ffmpeg -i 01.mkv -i 02.srt -map 0 -map 1 -codec copy outputfinall_2b.mkv


  


  works but does not show subtitles while playing only that is there.

  


  Please if you can help I would like a less jumbled mess code for this problem.
With keeping the metadata (titles) of the moved audio stream and subtitle.

  


  Thank you for your time !

  


• How to decode an MPEG Dash Widevine

  5 janvier 2016, par Martijn

  I have a video stream that I’d like to save to disk so I can play this back at a later time when I don’t have an internet connection at my disposal.

  The stream is a MPEG Dash Stream that uses Common Encryption, PlayReady, Widevine or Marlin.

  Is this possible in language like Go or NodeJS ?
  Could this be done using a command line utility like ffmpeg ?

• ffmpeg convert white color to alpha

  11 janvier 2021, par tony

  Hello i took a picture with my camera :a drawing of a square frame on a white paper ; i'm trying to convert the white to transparent and keep the black color frame.

  


  So i started making 1 palette with only 2 colors to make the colors uniform and 1 palette to add the transparency

  


  ffmpeg -f lavfi -i "color=color=white:100x100" -f lavfi -i "color=color=black:100x100" -filter_complex "[0][1]hstack" -frames:v 1 blackwhite.png`
ffmpeg -i blackwhite.png -filter_complex "[0]split[a][b];[a]palettegen[pal1];[b]palettegen=reserve_transparent=on:transparency_color=white[pal2]" -map [pal1] palette1.png -map [pal2] palette2.png


  


  then i mapped the image png of the frame to convert the white to transparent and overlayed the result to a red background

  


  ffmpeg -i image.png -i palette1.png -i palette2.png -i background.png -filter_complex "[0:v][1:v]paletteuse=dither=bayer[a],[a]split[a1][a2];[a1][2:v]paletteuse=alpha_threshold=128[c];[3:v][c]overlay[d]" -map [a2] -c:v png out.png -map [d] -c:v png out1.png


  


  the png mapped to the first palette (as a test) comes as it should be, pure black and white,the second comes with no transparency at all and covers the background
what am i doing wrong ?