[FFmpeg-devel] [PATCH] libavcodec/videotoolboxenc.c: Only log the EncoderID on macOS >= 10.13.

[Zhao Zhili]

> On Nov 24, 2023, at 23:40, David Bohman <debohman at gmail.com> wrote:
> 
> This is to fix a build failure on macOS < 10.13.
> 
> This is a build failure in release 6.1. The issue also exists at the
> top of the master branch, and the patch applies there.
> ---
> libavcodec/videotoolboxenc.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/libavcodec/videotoolboxenc.c b/libavcodec/videotoolboxenc.c
> index b0e827d14a..b72eb470fd 100644
> --- a/libavcodec/videotoolboxenc.c
> +++ b/libavcodec/videotoolboxenc.c
> @@ -1172,7 +1172,6 @@ static int vtenc_create_encoder(AVCodecContext   *avctx,
>             return AVERROR_EXTERNAL;
>         }
>     }
> -#endif
> 
>     // Dump the init encoder
>     {
> @@ -1201,6 +1200,7 @@ static int vtenc_create_encoder(AVCodecContext   *avctx,
>         if (encoderID != NULL)
>             CFRelease(encoderID);
>     }
> +#endif

It looks like kVTCompressionPropertyKey_EncoderID is the root cause of build failure.
I prefer use compat_keys, so it can be build on macOS < 10.13, get the key at runtime
and run on macOS >= 10.13.

> 
>     if (avctx->flags & AV_CODEC_FLAG_QSCALE && !vtenc_qscale_enabled()) {
>         av_log(avctx, AV_LOG_ERROR, "Error: -q:v qscale not available
> for encoder. Use -b:v bitrate instead.\n");
> -- 
> 2.43.0
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