[FFmpeg-devel] FFV1 slicecrc: "hashxx" instead of "CRC" for speed?

[Paul B Mahol]

On 10/26/22, Kieran Kunhya <kierank at obe.tv> wrote:
> On Tue, 25 Oct 2022, 21:32 Peter B., <pb at das-werkstatt.com> wrote:
>
>> Hi everyone :)
>>
>> Would it possibly have a significant impact on coding speed of FFV1's
>> slicecrc option (Where a CRC is calculated for each frame slice), to use
>> a faster algorithm instead (if one exists)?
>> I'm wondering if, for example something like "xxHash" may warrant a try?
>> (Haven't found CRC vs xxHash benchmarks yet, but I'm still looking)
>>
>> Anyhow,
>> Thanks for any of your time :D
>
>
> I haven't benchmarked the overhead of the CRC in FFv1 vs the encode or
> decode process.
> But FFmpeg's CRC could be optimised using multiple unrolled tables or SIMD
> or other approaches.

It is already using multiple tables.

>
> Regards,
> Kieran Kunhya
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