A query on A53 Closed captions (CC) implementation status in the hevc_nvenc encoder

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A query on A53 Closed captions (CC) implementation status in the hevc_nvenc encoder

Brainiarc7
Hello there,

Has A53 Closed Captions support been implemented in the hevc_nvenc
encoder, at the present?

I see a -a53cc option emitted by ffmpeg -h encoder=h264_nvenc but
omitted in hevc_nvenc.

Warm regards,

Dennis.
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Re: A query on A53 Closed captions (CC) implementation status in the hevc_nvenc encoder

Moritz Barsnick
Hi Dennis,

On Tue, Oct 22, 2019 at 04:09:16 +0300, Dennis Mungai wrote:
> Has A53 Closed Captions support been implemented in the hevc_nvenc
> encoder, at the present?

As far as I understand, yes.

https://github.com/FFmpeg/FFmpeg/commit/5a88e8c36581fed09c7db6dc7229f1fd9ab5559d

> I see a -a53cc option emitted by ffmpeg -h encoder=h264_nvenc but
> omitted in hevc_nvenc.

An option to *disable* insertion of a53 was introduced later, but
apparently forgotten for nvenc_hevc:

https://github.com/FFmpeg/FFmpeg/commit/dc2d56a66b8ad8bc5b07a5cc9c0608a67d5c2ae2

Cheers,
Moritz
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Re: A query on A53 Closed captions (CC) implementation status in the hevc_nvenc encoder

Brainiarc7
On Tue, 22 Oct 2019 at 10:28, Moritz Barsnick <[hidden email]> wrote:

>
> Hi Dennis,
>
> On Tue, Oct 22, 2019 at 04:09:16 +0300, Dennis Mungai wrote:
> > Has A53 Closed Captions support been implemented in the hevc_nvenc
> > encoder, at the present?
>
> As far as I understand, yes.
>
> https://github.com/FFmpeg/FFmpeg/commit/5a88e8c36581fed09c7db6dc7229f1fd9ab5559d
>
> > I see a -a53cc option emitted by ffmpeg -h encoder=h264_nvenc but
> > omitted in hevc_nvenc.
>
> An option to *disable* insertion of a53 was introduced later, but
> apparently forgotten for nvenc_hevc:
>
> https://github.com/FFmpeg/FFmpeg/commit/dc2d56a66b8ad8bc5b07a5cc9c0608a67d5c2ae2
>
> Cheers,
> Moritz

Thanks!

So that would mean that A53CC is indeed enabled on both h264 &
hevc_nvenc encoders, but can't be toggled off in the latter.
Understood.
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