Add subtitles starting at a specific timestamp using Ffmpeg-Python

Question

I want to add a .srt file (subtitles) to a .mp4 video. How can I add the subtitles at a specific timestamp?

As an example, my .mp4 video starts the talking part at 00:00:25, so thats there where I want to have the subtitles appearing with the audio.

I have this at the moment to add the subtitles in the video (and it works):

video_clip = ffmpeg.input("background_video.mp4")
video_clip.filter("subtitles", f"Subtitles/{post_id}/sub.srt",
                                           fontsdir="fonts/Roboto-Black.ttf",
force_style="Alignment=10,FontName=Roboto-Regular,FontSize=12")

Thanks in advance.

What I have above adds the subtitles in the beginning of the video (instead of in the 25th second)

RolandReff · Accepted Answer · 2023-08-21 00:55:56Z

0

video_clip.filter("subtitles", f"Subtitles/{post_id}/sub.srt",
                                        fontsdir="fonts/Roboto-Black.ttf",
force_style="Alignment=10,FontName=Roboto-Regular,FontSize=12",itsoffset = "00:00:25.0")

itsoffset = "00:00:25.0" at the end of the filter should do the trick perhaps, im used to another ffmpeg python binding but might be worth a shot.

edited Aug 21, 2023 at 0:55

answered Aug 21, 2023 at 0:55

RolandReff

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grilo13 Over a year ago

Hello Roland, thank you for the quick response. I found out about itsoffset later that day but could manage to use that using the filter method (as you just explained to me). Although I was able to delay the subtitles by using the pysrt library, using the shift method: python subs = pysrt.open(f"Subtitles/{post_id}/sub.srt") subs.shift(seconds=2.5) subs.save() And it does the same. I will test your solution when I have time for that, thank you again :)

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