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

2022-11-08 Thread Peter B.
Thanks for all your replies! Now I can refer to this, when being asked "Why CRC and not ...?" :) Kind regards, Peter ___ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link ab

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

2022-11-03 Thread Leo Izen
On 11/3/22 09:19, Nicolas George wrote: Leo Izen (12022-11-03): I'm a bit confused here, aren't there only 255 one-byte changes in the first place? The 256th is when the byte remains unchanged. Most data is made of more than one byte. Ah, so it's on average 255 out of every 256 one-byte

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

2022-11-03 Thread Nicolas George
Leo Izen (12022-11-03): > I'm a bit confused here, aren't there only 255 one-byte changes in the first > place? The 256th is when the byte remains unchanged. Most data is made of more than one byte. -- Nicolas George ___ ffmpeg-devel mailing list ffm

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

2022-11-03 Thread Leo Izen
On 10/26/22 15:13, Michael Niedermayer wrote: CRC is not a random pick for error detection, CRC has specfic properties like for example that whole classes of errors are guranteed to be detected a random hash will not gurantee that. for example a properly designed 8bit CRC will detect every singl

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

2022-10-26 Thread Paul B Mahol
On 10/26/22, Kieran Kunhya wrote: > On Tue, 25 Oct 2022, 21:32 Peter B., 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)

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

2022-10-26 Thread Kieran Kunhya
On Tue, 25 Oct 2022, 21:32 Peter B., 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

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

2022-10-25 Thread Andreas Rheinhardt
Peter B.: > Hi everyone :) > > This is merely a question of interest. Not a request, complaint or > trolling of any kind :) > I'm happy about any answer. I'm curious. > > Would it possibly have a significant impact on coding speed of FFV1's > slicecrc option (Where a CRC is calculated for each fr

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

2022-10-25 Thread Peter B.
Hi everyone :) This is merely a question of interest. Not a request, complaint or trolling of any kind :) I'm happy about any answer. I'm curious. 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