From: "Tomas Härdin" <git@haerdin.se>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] looking to hire expert for a short project: lossless screen and sound capture 4k@60hz
Date: Mon, 31 Jul 2023 17:35:43 +0200
Message-ID: <273ece4615367af9a87177343085a418ae98ce1f.camel@haerdin.se> (raw)
In-Reply-To: <7d077a86-496d-b3af-7b10-fb4cb8c9aa89@gmail.com>
fre 2023-07-28 klockan 02:49 +0100 skrev Misha Aizatulin:
> Hi all,
>
> I've been directed here from https://ffmpeg.org/consulting.html as
> I'm looking to hire an expert
> for what should hopefully be a simple but well-paid job. Please let
> me know if anyone has availability!
>
> What I'm trying to do is capture demoscene demos in full quality:
> 4k@60hz (with sound of course).
> My rig is presentable: nvidia A6000 and 192G RAM. I am a software
> engineer, but don't know very much
> about video processing or ffmpeg.
>
> I tried:
> ffmpeg -filter_complex ddagrab=0,hwdownload,format=bgra,framerate=60
> -c:v utvideo output.mkv
>
> What happened: the first minute or so (always roughly the same
> length of time) is captured fine.
> Then it drops off the cliff, something like 1 frame per 3 seconds,
> but also trying to interpolate
> between them, so it looks really weird.
>
> I was not able to get ffmpeg to report to me any dropped frames
> which is upsetting and worrying.
> I also don't understand where the interpolation comes from and would
> love to turn it off.
>
> I can't think of a reason for the droppage: my RAM is big enough
> to hold the full video (about
> 50G total). My only theory is that GPU memory might be getting full
> (will check tomorrow), but I'd
> expect hwdownload rates to not be that slow.
>
> Maybe I should use hevc_nvenc with lossless setting, but there's
> some talk about the yuv420
> conversion being not lossless...
>
> Anyway, would really appreciate someone educating me on these and
> would happily pay for your time!
I would suggest using .kkapture: http://farbrausch.de/~fg/kkapture/
/Tomas
_______________________________________________
ffmpeg-devel mailing list
ffmpeg-devel@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
To unsubscribe, visit link above, or email
ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
next prev parent reply other threads:[~2023-07-31 15:35 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-28 1:49 Misha Aizatulin
2023-07-31 15:35 ` Tomas Härdin [this message]
2023-08-01 0:24 ` Misha Aizatulin
2023-08-18 22:55 ` Misha Aizatulin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=273ece4615367af9a87177343085a418ae98ce1f.camel@haerdin.se \
--to=git@haerdin.se \
--cc=ffmpeg-devel@ffmpeg.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Git Inbox Mirror of the ffmpeg-devel mailing list - see https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
This inbox may be cloned and mirrored by anyone:
git clone --mirror https://master.gitmailbox.com/ffmpegdev/0 ffmpegdev/git/0.git
# If you have public-inbox 1.1+ installed, you may
# initialize and index your mirror using the following commands:
public-inbox-init -V2 ffmpegdev ffmpegdev/ https://master.gitmailbox.com/ffmpegdev \
ffmpegdev@gitmailbox.com
public-inbox-index ffmpegdev
Example config snippet for mirrors.
AGPL code for this site: git clone https://public-inbox.org/public-inbox.git