[FFmpeg-devel] [PATCH v4 1/3] speedhq: fix behavior of single-field decoding

[Michael Niedermayer]

On Wed, Aug 02, 2017 at 06:08:28PM +0200, Steinar H. Gunderson wrote:
> The height convention for decoding frames with only a single field made sense
> for compatibility with legacy decoders, but doesn't really match the convention
> used by NDI, which is the primary (only?) user. Thus, change it to simply
> assuming that if the two fields overlap, the frame is meant to be a single
> field and the frame height matches the field height.
> 

> Also add simple FATE tests, based on output produced by the NDI SDK.

this line belongs to the ther patch


> ---
>  libavcodec/speedhq.c | 15 +++++++++------
>  1 file changed, 9 insertions(+), 6 deletions(-)
> 
> diff --git a/libavcodec/speedhq.c b/libavcodec/speedhq.c
> index 60efb0222b..eca45beb67 100644
> --- a/libavcodec/speedhq.c
> +++ b/libavcodec/speedhq.c
> @@ -448,12 +448,15 @@ static int speedhq_decode_frame(AVCodecContext *avctx,
>      frame->key_frame = 1;
>  
>      if (second_field_offset == 4) {
> -        /*
> -         * Overlapping first and second fields is used to signal
> -         * encoding only a single field (the second field then comes
> -         * as a separate, later frame).
> -         */
> -        frame->height >>= 1;
> +	/*

tabs are not allowed in ffmpeg git (except makefiles)

[...]
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Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

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