[FFmpeg-devel] Live Transcoding: SCTE35 passthrough

[FFmpeg-devel] Live Transcoding: SCTE35 passthrough

[Shane Warren]

I have been working on getting scte35 pass through working in FFmpeg. I have the SIT pid being passed through fine, but I need to adjust the pts_adjustment field since I'm doing a live transcode and using vsync 1.

I'm struggling with finding how to match up an incoming frame of video to a transcoded frame of video so I can figure out the pts adjustment. Am I missing something, or is there some way to match up an incoming frame to a encoded frame and figure out their pts difference?


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Re: [FFmpeg-devel] Live Transcoding: SCTE35 passthrough

[Devin Heitmueller]

On Tue, Jul 19, 2022 at 9:44 AM Shane Warren <shanew@innovsys.com> wrote:
>
> I have been working on getting scte35 pass through working in FFmpeg. I have the SIT pid being passed through fine, but I need to adjust the pts_adjustment field since I'm doing a live transcode and using vsync 1.
>
> I'm struggling with finding how to match up an incoming frame of video to a transcoded frame of video so I can figure out the pts adjustment. Am I missing something, or is there some way to match up an incoming frame to a encoded frame and figure out their pts difference?

I've got this working in a branch that isn't upstream.  This includes
a BSF which deals with the pts_adjust field.  It should do what you
need (although the branch point is a bit stale):

https://github.com/LTNGlobal-opensource/FFmpeg-ltn/commits/n4.3.1-scte35

If you're comfortable recompiling from source, you can incorporate a
variant of these patches into your local tree.

Devin

-- 
Devin Heitmueller, Senior Software Engineer
LTN Global Communications
o: +1 (301) 363-1001
w: https://ltnglobal.com  e: devin.heitmueller@ltnglobal.com
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Re: [FFmpeg-devel] Live Transcoding: SCTE35 passthrough

[Shane Warren]

Thanks, I hand patched that back into a newer ffmpeg and with a few changes it worked great.

-----Original Message-----
From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of Devin Heitmueller
Sent: Tuesday, July 19, 2022 11:40 AM
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] Live Transcoding: SCTE35 passthrough


On Tue, Jul 19, 2022 at 9:44 AM Shane Warren <shanew@innovsys.com> wrote:
>
> I have been working on getting scte35 pass through working in FFmpeg. I have the SIT pid being passed through fine, but I need to adjust the pts_adjustment field since I'm doing a live transcode and using vsync 1.
>
> I'm struggling with finding how to match up an incoming frame of video to a transcoded frame of video so I can figure out the pts adjustment. Am I missing something, or is there some way to match up an incoming frame to a encoded frame and figure out their pts difference?

I've got this working in a branch that isn't upstream.  This includes a BSF which deals with the pts_adjust field.  It should do what you need (although the branch point is a bit stale):

https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FLTNGlobal-opensource%2FFFmpeg-ltn%2Fcommits%2Fn4.3.1-scte35&amp;data=05%7C01%7Cshanew%40innovsys.com%7C2fb835f6c03d4bf4ea9e08da69a564d0%7C7a48ce45ee974a95ac183390878a179b%7C0%7C0%7C637938456345483120%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=SJJDcJrCY3rHXNn9tzpQ3M5bj6Ey%2BUIepSIOYAZU49M%3D&amp;reserved=0

If you're comfortable recompiling from source, you can incorporate a variant of these patches into your local tree.

Devin

--
Devin Heitmueller, Senior Software Engineer LTN Global Communications
o: +1 (301) 363-1001
w: https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fltnglobal.com%2F&amp;data=05%7C01%7Cshanew%40innovsys.com%7C2fb835f6c03d4bf4ea9e08da69a564d0%7C7a48ce45ee974a95ac183390878a179b%7C0%7C0%7C637938456345483120%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=1HYGR80ix2UDxPFGDPiuqE3EM%2Ba%2FDlvevbSy1IW2etU%3D&amp;reserved=0  e: devin.heitmueller@ltnglobal.com _______________________________________________
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