Re: [FFmpeg-devel] [PATCH] lavc/libx264: enable x4->params.analyse.b_fast_pskip if mb_info is set

[Kieran Kunhya <kierank@obe.tv>]

On Thu, 31 Aug 2023 at 15:30, Kieran Kunhya <kierank@obe.tv> wrote:

>
>
> On Thu, 31 Aug 2023 at 15:12, Carotti, Elias via ffmpeg-devel <
> ffmpeg-devel@ffmpeg.org> wrote:
>
>> Hi
>>
>> -----Original Message-----
>> From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of
>> Stefano Sabatini
>> Sent: Friday, August 25, 2023 12:01 PM
>> To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
>> Cc: Stefano Sabatini <stefasab@gmail.com>
>> Subject: [EXTERNAL] [FFmpeg-devel] [PATCH] lavc/libx264: enable
>> x4->params.analyse.b_fast_pskip if mb_info is set
>>
>> CAUTION: This email originated from outside of the organization. Do not
>> click links or open attachments unless you can confirm the sender and know
>> the content is safe.
>>
>>
>>
>> x4->params.analyse.b_fast_pskip should only be forced in case mb_info
>> is set.
>>
>> Fix output change introduced in 418c954e318.
>> ---
>>  libavcodec/libx264.c | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/libavcodec/libx264.c b/libavcodec/libx264.c index
>> 1a7dc7bdd5..a2877d7f75 100644
>> --- a/libavcodec/libx264.c
>> +++ b/libavcodec/libx264.c
>> @@ -1190,7 +1190,9 @@ FF_ENABLE_DEPRECATION_WARNINGS
>>      }
>>
>>      x4->params.analyse.b_mb_info = x4->mb_info;
>> -    x4->params.analyse.b_fast_pskip = 1;
>> +    if (x4->mb_info) {
>> +        x4->params.analyse.b_fast_pskip = x4->mb_info;
>> +    }
>>
>>      // update AVCodecContext with x264 parameters
>>      avctx->has_b_frames = x4->params.i_bframe ?
>> --
>> 2.25.1
>>
>>
>> Sorry for the delay. I agree, this was missing in the patch.
>> Best
>> Elias
>>
>
> What does this patch actually do?
>
> Kieran
>

In particular why are you turning on fast_pskip silently based on a
completely different setting?

Kieran
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