mkvmerge convert .mp4 to .mkv become jerky

[sailor420]

I have a batch routine to convert .mp4's to .mkv's.

All I'm basically doing is using this to add a personalized COLORED .srt to existing .mp4, .mkv and .avi files.

This routine works flawlessly on doing .mkv to .mkv files. Come out just lie ORIG with my mods, non-jerky framerate.

Routine removes all existing subpics, add NEW colored subpic, adds/modifies, video, audio and subpic Descriptions via a .json config files.

Tried tweaks in VLC codec section, per https://windowsreport.com/vlc-media-player-lagging-windows-10/#2 ... no help there !!

VLC is my goto player .. same with MPC-HC

The jerkiness is slight, but enough to make you not want to watch it !!

Please assist..... THANKS in Advance @@

set mkvmerge=F:\Media\MKVToolNix\mkvmerge.exe
set mkvjsons=J:\MKVToolNix\MKVjsons\
set jsonsext=.json
set subsave=J:\MKVToolNix\SubPic_Out\

if not exist "mkvmerge_out" (mkdir "mkvmerge_out")

if not exist "moved_mp4s" (mkdir "moved_mp4s")


for %%f in (*.mp4) do %mkvmerge% -o "mkvmerge_out/%%~nf.mkv" --no-subtitles "%%f" "%%~nf.srt"    


move /y ".\mkvmerge_out\*.mkv" ".\"


for %%f in (*.mkv) do %mkvmerge% @%mkvjsons%%jsonname%%jsonsext% -o "mkvmerge_out/%%~nf.mkv" --title "%%~nf" "%%~f"


move /y ".\mkvmerge_out\*.mkv" ".\"

[sailor420]

Attached .json as .txt

[davexnet]

Did you check the mediainfo (text view) for the before and after files to see if anything suspicious stands out ?

[netmask56]

Are you using the latest version of MKVToolNix (v59) It now supports Dolby Vision..... at last

[sailor420]

@netmask56 ... My ver is a little out of date .... using v.24 .. lol

@davexnet ..... about the same ... frame rate same

Need to do clean up on PC as MEDIA drives are FULL ... then test further

One good thing is its not my .bat routine ... MKVToolNik does the same thing

The other good news is it's related to the ORIG encoding as NOT all .mp4 test get the Beef Jerky effect. In fact its a very small percentage, 4 out of 20 to 30 muxed.

So hopefully by today I'll have an answer after more testing

PS: Gonna test with ffmpeg too so stay tuned

[sailor420]

Embarrassed to say what fixed it ...... the outdated version

Bartender, get netmask a Golden margarita and a pint .... Cheers Mate !!!

[netmask56]

My pleasure! I'll settled for a strong black coffee as a morning heart starter !