How to overlay http subtitle stream on http AV stream

[s60sc]

Given the yaml file below, how to overlay a subtitle stream in SRT format from http://192.168.1.135/sustain?srt=3
Thanks

streams:

  CAM:
    - ffmpeg:http://192.168.1.135/sustain?stream=1#video=h264
    - ffmpeg:http://192.168.1.135/sustain?audio=2#audio=opus

[AlexxIT]

SRT not supported. What you are viewing? Is it usual TV?

[s60sc]

Streams generated by an ESP32, viewed on the go2rtc built in player for testing. ChatGPT indicates ffmpeg can combine SRT and video eg
ffmpeg -i http://path_to_video_stream -i http://path_to_subtitle_stream -c:v copy -c:a copy -c:s mov_text
but how to incorporate this into the yaml file if possible.
Thanks.

[AlexxIT]

What is inside your SRT? Is it some real time information?

[s60sc]

At this stage just a series of timestamps

1
00:00:00 --> 00:00:01
17:58:52

2
00:00:01 --> 00:00:02
17:58:53

would something like:
- exec:ffmpeg -i http://192.168.1.135/sustain?stream=1 -i http://192.168.1.135/sustain?srt=3 -c:v copy -c:a copy -c:s mov_text

be in the right direction, but how to direct it to the go2rtc player as a h264 stream

[AlexxIT]

Once again. For now go2rtc doesn't support any subtitles. Because I haven't seen any point to support them for real time tasks.
I thought you were going to tell me some interesting reason to support them. But so far, I don't see one :)

[s60sc]

Fair enough, thanks for your time.
Actually it would have been useful for treal time sensor telemetry data,

[AlexxIT]

I haven't see useful software, that can generate subtitles in real time. For example voice recognition. Or even telemetry data from some sensors.

[s60sc]

My esp32s3 app can generate real time telemetry data which it currently stores as an srt file along with an avi file which can be played back together with eg VLC. A user suggested adding streaming audio and referenced your app, and outputting an srt stream as well is straightforward

[rjsachse]

This would be a great feature 👍

[AlexxIT]

That's a pretty big task. Need to add a new entity - text. I'll hold off until a better time.