[Libav-user] H264 SEI Information from libavcodec/libavformat

Brad Hards bradh at frogmouth.net
Fri Jun 25 13:22:53 EEST 2021

On Friday, 25 June 2021 8:18:22 PM AEST you wrote:
> On Friday, 25 June 2021 6:00:24 PM AEST Alan Johnson wrote:
> > Is there anyway to add a h264 NAL (SEI Timecode) unit to an existing
> > without access libavcodec source (i.e. only linking against the DLL)?
> I don't think so.
> AFAICT, the H.264 encoders don't support SEI writing in any released
> version. It should work in nvenc as of the next release. Others are a work
> in progress.
Ah, maybe I was too fast. What timecode do you want? SMPTE 12M should work in at least 
nvenc and x264. 

What have you tried?


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