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• faster way to downmix 5.1 videos to stereo ?

  22 octobre 2020, par alex hansen

  I have a hand full of movies that are all in 5.1 audio, i need there to be one audio track that is only in stereo. i have found a few suggestions as to how to do this but some dont work for me and others are way too slow.

  


  the one i found that works the fastest is this :

  


  ffmpeg -y -i "input" -map 0:v -c:v copy -map 0:a:0? -c:a:0 copy -map 0:a:0? -c:a:1 aac -ac 2 -metadata:s:a:1 title="Eng 2.0 Stereo" -map 0:a:1? -c:a:2 copy -map 0:a:2? -c:a:3 copy -map 0:a:3? -c:a:4 copy -map 0:a:4? -c:a:5 copy -map 0:a:5? -c:a:6 copy -map 0:a:6? -c:a:7 copy -map 0:s? -c:s copy "output"   


  


  sadly i do not remember where it came from.

  


  the problem with this being that it creates a separate audio track, and for my purposes this does not work.

  


  doing just the standard -ac 2 works but is way to slow, i estimated to take over 40 hours to go through all my movies.

  


  edit :
a bit of extra information to throw in here

  


  

  • all the movies are mp4's

  


  • all except 2 movies are 5.1 audio (there is 1 7.1 and 1 mono. i dont really care about them tho)

  


  • the command i posted runs at about a 40x speed while just doing -ac 4 runs at 2x speed

  


  


• Encoding videos with mixed aspect ratios in hevc [closed]

  25 octobre 2020, par bader515

  I have a huge library of movies, TV Shows, Anime, and Cartoons (about 16tb sorted by plex on my NAS).

  


  Most of them are encoded in h.264, and each video has a different aspect ratio (1920x1080,1280x720...etc).

  


  Is there a way to re-encode them using any tool to hevc with the same aspect ratio and bit per pixel ?

  


  I have already tried using this command using ffmpeg, but the result is a bigger size video (with the sd videos) :

  


  pushd "%2"
SET paths=paths.txt
SET /A ffmpeg_qv=24
if EXIST %paths% (
for /f "tokens=*" %%a in (%paths%) do (
    echo Changing to directory %%a
    pushd "%%a"
    CALL :ffmpeg
    )
) else (
CALL :ffmpeg
)
pause
EXIT /B %ERRORLEVEL%
  :ffmpeg
    for /R %%A in (*.mp4, *.avi, *.mov, *.wmv, *.ts, *.m2ts, *.mkv, *.mts) do 
(
        echo Processing "%%A"
    ffmpeg -hwaccel auto -i "%%A" -pix_fmt yuv420p -map 0:v -map 0:a -map_metadata 0 -c:v hevc_nvenc -rc constqp -qp %ffmpeg_qv% -b:v 0K -c:a aac -b:a 384k -movflags +faststart -movflags use_metadata_tags "%%A_CRF%ffmpeg_qv%_HEVC.mp4"
    echo Processed %%A
)
GOTO :EOF


  


• convert multivideos from 1080p to 720p and add watermarks with subtitles ?

  20 novembre 2020, par shady melad

  0

  


  i will ask again i have many videos like series (dark - la casa de papel - game of thrones ) all of them without any subtitle or watermark first i burn subtitles with handbrake sec i use ffmpeg to burn watermark with videos by this code

  


  for %i in ("C :\Users\shady\Downloads\convert\01*.mp4") do ffmpeg -i "%i" -i C :\Users\fady\Downloads\convert\shady.png -filter_complex "overlay=main_w-overlay_w-10:10" -codec:a copy "C :\Users\shady\Downloads\convert\new01% ni.mp4"

  


  then i convert it to 720p with this code

  


  for %i in (C :\Users\shady\Downloads\convert\01*.mp4) do ffmpeg -i "%i" -c:a copy -s hd720 "C :\Users\shady\Downloads\convert\new01% ni.mp4"

  


  my question now if i want to burn subtitle for series dark all seasons with my watermark and the final file get out with 720p with subtitle with watermark on top at right

  


  can i do that ?

  


  watermark png subtitle srt movies come with mkv not mp4 ( i want the final file come with mp4 )