I was finding the way to strip file as much as possible since disabling mapping metadata in ffmpeg stopped working in the past and this was the only way worked, but still not optimally - some metas remains ;-)

--deim

Dne 25. 11. 22 v 1:57 Andrew Randrianasulu via Cin napsal(a):


пт, 25 нояб. 2022 г., 03:22 Phyllis Smith via Cin <cin@lists.cinelerra-gg.org>:
Interesting results from tests using "flags" on a small 4K webm video only.  You can see "bitexact" is the same as flags set to unaligned, mv4, qpel, and gray. Cgop and Global Header do differ so it appears that "flags" is working.

   SAME 69705241 Nov 24 15:29 unaligned.mp4
   SAME 69705241 Nov 24 15:30 mv4.mp4
   SAME 69705241 Nov 24 16:51 qpel.mp4
   Different 69808336 Nov 24 15:23 cgop.mp4
   SAME 69705241 Nov 24 16:57 gray.mp4
   SAME  69705241 Nov 24 17:00 bitexact.mp4
   Different  69704581 Nov 24 17:02 global_header.mp4

in theory bitexact should product exactly same file on different runs - no time/date metadata embedded for example ....

On Thu, Nov 24, 2022 at 12:11 PM Phyllis Smith <phylsmith2017@gmail.com> wrote:
deim31:
As Andrew said, it is there in "flags" (at least for mp4 and mov) but with the video I tried, I saw no difference.  Steps to get flag "bitexact":
 
1) bring up render menu and set your File Format as usual to FFMPEG/mp4  or mov (have not tried others)
2) click on the Video wrench, then click on box in Video Options "view" which brings up a menu
3) in the 2nd line on the top right is the box Kind which is set to codec; use the arrow to set to "ffmpeg"
4) on the left side scroll down in the option area and look for "flags" and highlight that
5) above the option header is now the word "flags" with a down arrow; click on arrow and you see "bitexact" which you should click on and you will see the value switch from 0x0 to 0x00800000 (I lost count of zeros but you get it)
6 ) click on Apply box below the Kind box and click OK button in menu

Please let us know if this actually works.

On Thu, Nov 24, 2022 at 9:39 AM deim31 via Cin <cin@lists.cinelerra-gg.org> wrote:
Hi,

I'm looking for way to add to Cin's ffmpeg encoder -bitexact flag.

I've tried to add similar way as
movflags=+faststart

but didn't succeed with any of:

-bitexact
bitexact
bitexact=

Thanks :-)

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