Problem with Aegisub tag

[Fragha]

Hi there.

I work with Aegisub for a while, but recently I experimented with the tag for font scale (\fscx<scale> and \fscy<scale>).
Everything seemed fine within Aegisub, and I used the tag animated transform to create an effect where a title seems to be growing, something like {\fscx80\fscy80\t(0,2000,\fscx100\fscy100)}Example .

Then, with the file saved, I used Handbrake to burn the subtitles onto the video in mp4 format, like I always do with the videos of my clients. The problem is when the encoding ended, the parts where I used the font scale animation appeared stuttering.

Does anyone have noticed the same? Any clue on how to avoid and correct this?

Regards.

[videobruger]

Just to test:

I took a video file, Video.mkv
And a slightly modified version of your subtitle file, Subs.ass
That I muxed together to Video (1).mkv and hardcoded the subtitles in HandBrake to the file Video (1)-1.m4v.

I found the same stuttering as you mention.

Then I hardcoded the subtitles with ffmpeg

ffmpeg -i Video.mkv -vf ass='d\:\\00\\clips\\Subs.ass' ffout.mp4

and found the file ffout.mp4 plays without the stuttering.

So to answer

Any clue on how to avoid and correct this?

Use ffmpeg instead of HandBrake.

(if you insist on using HandBrake you could make a two line avs script like

FFVideoSource("D:\00\Clips\video.mkv")
textsub("D:\00\clips\subs.ass")

and make a virtuel file with avfs and use that as input to HandBrake. This also plays without stutter)

[Fragha]

Thank you very much for your reply, videobruger.

This will be most useful. I never tried and experiment scripts with Handbrake, but I'll give it a try.