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From: "Martin Storsjö" <martin@martin.st>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH] hevcdec: Correctly signal AVCOL_RANGE_UNSPECIFIED if nothing was set in the bitstream
Date: Thu, 17 Feb 2022 15:06:30 +0200 (EET)
Message-ID: <c1982f3b-eb3e-f337-3074-5a618ae7dfc6@martin.st> (raw)
In-Reply-To: <CA+anqdxCXc8iUuUBBtRQW6qQ7tcu=GsLmLvJhXut0GKx-1bSSA@mail.gmail.com>

On Thu, 17 Feb 2022, Hendrik Leppkes wrote:

> On Thu, Feb 17, 2022 at 1:54 PM Martin Storsjö <martin@martin.st> wrote:
>>
>> This matches what the H264 decoder signals for such a case.
>>
>> Signed-off-by: Martin Storsjö <martin@martin.st>
>> ---
>>  libavcodec/hevcdec.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/libavcodec/hevcdec.c b/libavcodec/hevcdec.c
>> index 8d7a4f7147..01d459984f 100644
>> --- a/libavcodec/hevcdec.c
>> +++ b/libavcodec/hevcdec.c
>> @@ -338,7 +338,7 @@ static void export_stream_params(HEVCContext *s, const HEVCSPS *sps)
>>          avctx->color_range = sps->vui.video_full_range_flag ? AVCOL_RANGE_JPEG
>>                                                              : AVCOL_RANGE_MPEG;
>>      else
>> -        avctx->color_range = AVCOL_RANGE_MPEG;
>> +        avctx->color_range = AVCOL_RANGE_UNSPECIFIED;
>>
>
> The HEVC specification is pretty clear that when its not signalled, it
> should be inferred as 0 (eg. mpeg)
>
>> When the video_full_range_flag syntax element is not present, the value of video_full_range_flag is inferred to be equal to 0

Hmm, I see. Ok, thanks - patch dropped then.

// Martin
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      reply	other threads:[~2022-02-17 13:06 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-17 12:54 Martin Storsjö
2022-02-17 12:58 ` Hendrik Leppkes
2022-02-17 13:06   ` Martin Storsjö [this message]

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