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Topic review (newest first)

2019-04-30 16:36:41

Triggered by GoT:

Testing 10 bit and aq-mode=3 for darker scenes.

ffmpeg -i terra4-Jan-06-2012-181058-SpiritQuaddict.avi -ss 0 -t 120 -acodec libmp3lame -ab 192k -c:v libx264 -preset slow -crf 20 terra4.mkv

with combinations of

-pix_fmt yuv420p10le


-pix_fmt yuv420p


-x264-params aq-mode=3

vs none.

Conclusion: Nothing spectacular. 10bit was ~2% smaller but also looked worse in some places, better in others. aq-mode=3 indeed makes details in dark places better but also adds almost 20% of file size. Just choosing a crf +1  leads to similar improvements... Spirit, stop wasting your time on this kind of stuff again. ;o)

2017-02-10 21:21:54

On debian jessie, even in lxc

aptitude install xvfb libgl1-mesa-dri libegl1-mesa-drivers quake darkplaces mesa-utils

xvfb-run -s "-screen 0 640x480x24" darkplaces +playdemo 1 +cl_capturevideo 1

For sound load modprobe snd-dummy on the host, restart the container. :o)

2013-07-25 20:22:54

Huh, capturing video on a headless server is easy!

XAUTHORITY= # maybe not needed?
Xvfb :2 -screen 0 800x600x24 &
export DISPLAY=:2.0
darkplaces-sdl +playdemo 1 +cl_capturevideo 1 # ugly dp video capture as test

Audio is missing as the server has no soundchip. Maybe there is a way to use a dummy device?

I did install "xorg-server-xvfb xorg-twm xorg-xclock xterm xf86-video-sis xorg-server xorg-server-utils xorg-xinit xorg-apps", some of which were probably not needed.
Seems like other engines like to use XFree86-VidModeExtension which is not available with xvfb. Tried so far: tyr-quake, tyr-glquake, requiem

2013-05-21 15:48:41

On second thought, you are right. volume was set to 1 where 0.7 is the default. I will use that from now on. Thanks!

2013-05-20 20:20:15

I compared to other Quake videos on Youtube and it seems ok.

2013-05-20 07:23:21

Whatever you use for the audio, please lower the volume/normalization settings by at least 1/3.

2013-05-19 09:15:49

If you are concatting with ffmpeg, make sure the input files have the same audio characteristics. My problem was that I had files with both 44.1 and 48 kHz.

2013-03-27 22:27:33

Or not, the ffmpeg way gives me problems in mplayer when it gets to the quickloading bits. mplayer stops there. vlc plays them but shows a brief black frame. Maybe that file is bad?

2013-03-27 22:06:37

I cannot append with avidemux anymore, sound gets borked. :(

"mencoder middle_____-Mar-23-2013-18*.mkv -oac copy -ovc copy -o test.mkv" = broken

The -i filelist concat demuxer version of ffmpeg seems to work. … es#demuxer . The "name|name2" is NOT the demuxer!

2013-02-01 20:20:43


real    6m19.205s
user    23m41.643s
sys    0m5.540s

wow :))

2013-02-01 12:42:53

AMD 240:
ffquake q1tm2_lev-normal-SpiritQuaddict.avi
real    24m13.629s
user    42m32.007s
sys    0m22.882s

2012-12-09 16:58:03

To append multiple files in Avidemux, drag and drop them from a file browser window.

Appending mkv files works fine.

2012-07-30 19:40:38

Concat with ffmpeg is a pain in the ass. Avidemux does it well.


I am I/O bound on capturing. ~60MB/s on sda SAMSUNG HD154UI, ~80MB/s on sdb WDC WD20EARX. CPU and GPU are relaxed when capturing. CPU is 100% when sitting in the console. Someone gift me a SSD please.

Encoding is CPU bound since I use x264. AMD Phenom II X4 945 95W (C3) could be ~100% faster. Someone gift me a better CPU please. … x264&lang=

Uploading is OH LOOK 6MBit/s! Nevermind all above. :(

2012-07-28 07:07:30

Still too dark :]

2012-07-24 14:11:42

Note to self: requiem does capture with correct gamma in window mode, -gamma 0.7 DOES capture with that.

edit: It also seems to work in fullscreen. I do not remember why it did not do that earlier.

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