What's the best way to record the screen losslessly* nowadays?
I'm using CamStudio with the CamStudio Lossless codec. It's not bad, but when I'm recording at 1920x1080 I get 14 FPS at most, which is not great.
I tried with a couple of other codecs (Lagarith and Ut), but they're even a bit slower and produce much bigger files.
I get more FPS with smaller resolutions, but my CPU is nowhere near maxed out at 1920x1080, with any codec (it goes to about 30% at most).
So what's the reason for low FPS?
Could it be CamStudio? Do other screen recorders perform better?
*I prefer lossless for later editing and final lossy compression without losing too much quality
Hi all,
as the GZIP mode of the CamStudio Codec was somehow broken, I decided to look into it.
The issue was (or so it seems to me) that the allocated internal compression buffer size ('destlen') was too small. I think it could have been even zero. Setting the buffer manually to arbitrarily selected 4 MB (4194304) made the codec work for me.
While I was at it, I updated zlib to v.1.2.8 and compiled it in VS2015 with SSE2 and AVX support. I didn't check whether the compiler actually created those instructions but at least the compiler was allowed to use them.
As I didn't find the sources for v1.5, this is based on the sources of codec v1.4 and is aptly named v1.401.
You can test this version here, I chose hosters with long file expiration:
https://piecejointe.net/?ii297ctwbv
http://www.xup.in/dl,17140929/CamStudioCodec-1.401.zip/
https://filetea.me/t1sQgYHQat6RJSL1a9xlajHOw
MD5 checksum for the ZIP should be: 9029b516c1d8be53a0d6221791e2bfc9
I hope I didn't break things. Especially, GZIP should be working now.
Should everything work as expected, I will of course also distribute the modified source.
But the main question I have is the following: After a small modification (INT_PTR instead of BOOL for WinAPI dialog handling), the source also compiled fine for x64. However, I had no success to get the codec installed. I tried several regsvr32 and setupapi.dll,InstallHinfSection methods and also tried to modify the INF file but it didn't work. Either I got error messages or just nothing showed up in the VirtualDub64 compression dialog.
Is compiling for x64 not enough to make it work?
Best regards
pwo
Best Codec For Camstudio
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