Mostly 'v4l2:///dev/video0 -Vdummy --no-audio --run-time 1 --scene-path ./tmp --scene-replace --scene-format png --video-filter scene vlc://quit' or even 'cvlc v4l2:///dev/video0 -Vdummy --no-audio --run-time 1 --scene-path ./tmp --scene-format png --video-filter scene vlc://quit' does not quit as expected. I started with an empty tmp directory: rose@leopard:/home_leopard/rose/Txt/projects/IVD_soeren/Cameras/Phytec(259)$ rm tmp/* rose@leopard:/home_leopard/rose/Txt/projects/IVD_soeren/Cameras/Phytec(260)$ time cvlc v4l2:///dev/video0 -Vdummy --no-audio --run-time 1 --scene-path ./tmp --scene-replace --scene-format png --video-filter scene vlc://quit VLC media player 2.1.2 Rincewind (revision 2.1.2-0-ga4c4876) [0x2030da8] dummy interface: using the dummy interface module... Fontconfig warning: FcPattern object size does not accept value "0" Fontconfig warning: FcPattern object size does not accept value "0" Fontconfig warning: FcPattern object size does not accept value "0" Fontconfig warning: FcPattern object size does not accept value "0" [0x7f439c000e68] idummy demux: command `quit' real 0m15.192s user 0m1.000s sys 0m0.179s I expected the end after one second 15 seconds is a little bit longer. OK, maybe there is some overhead. I repeated the experiment, now there was scene.png in the tmp directory: rose@leopard:/home_leopard/rose/Txt/projects/IVD_soeren/Cameras/Phytec(261)$ ll tmp/ insgesamt 468 -rw-r----- 1 rose rose 476280 5. Feb 15:27 scene.png rose@leopard:/home_leopard/rose/Txt/projects/IVD_soeren/Cameras/Phytec(262)$ time cvlc v4l2:///dev/video0 -Vdummy --no-audio --run-time 1 --scene-path ./tmp --scene-replace --scene-format png --video-filter scene vlc://quit VLC media player 2.1.2 Rincewind (revision 2.1.2-0-ga4c4876) [0x105bda8] dummy interface: using the dummy interface module... Fontconfig warning: FcPattern object size does not accept value "0" Fontconfig warning: FcPattern object size does not accept value "0" Fontconfig warning: FcPattern object size does not accept value "0" Fontconfig warning: FcPattern object size does not accept value "0" [0x7fa598000e28] idummy demux: command `quit' real 0m39.743s user 0m1.982s sys 0m0.280s Almost 40 seconds! What is vlc doing. The same once more: rose@leopard:/home_leopard/rose/Txt/projects/IVD_soeren/Cameras/Phytec(263)$ ll tmp/ insgesamt 700 -rw-r----- 1 rose rose 715218 5. Feb 15:28 scene.png rose@leopard:/home_leopard/rose/Txt/projects/IVD_soeren/Cameras/Phytec(264)$ time cvlc v4l2:///dev/video0 -Vdummy --no-audio --run-time 1 --scene-path ./tmp --scene-replace --scene-format png --video-filter scene vlc://quit VLC media player 2.1.2 Rincewind (revision 2.1.2-0-ga4c4876) [0x229ada8] dummy interface: using the dummy interface module... Fontconfig warning: FcPattern object size does not accept value "0" Fontconfig warning: FcPattern object size does not accept value "0" Fontconfig warning: FcPattern object size does not accept value "0" Fontconfig warning: FcPattern object size does not accept value "0" [0x7f2ba4000e68] idummy demux: command `quit' real 3m59.724s user 0m12.016s sys 0m2.263s Almost 4 minutes! What is happening? I remove the --scene-replace argument and hope, that vlc will save some snapshots. At this attempt it even works and I got 48 new images: rose@leopard:/home_leopard/rose/Txt/projects/IVD_soeren/Cameras/Phytec(265)$ time cvlc v4l2:///dev/video0 -Vdummy --no-audio --run-time 1 --scene-path ./tmp --scene-format png --video-filter scene vlc://quitVLC media player 2.1.2 Rincewind (revision 2.1.2-0-ga4c4876) [0x1922cb8] dummy interface: using the dummy interface module... Fontconfig warning: FcPattern object size does not accept value "0" Fontconfig warning: FcPattern object size does not accept value "0" Fontconfig warning: FcPattern object size does not accept value "0" Fontconfig warning: FcPattern object size does not accept value "0" [0x7f5e60000e68] idummy demux: command `quit' real 1m41.502s user 0m4.676s sys 0m0.629s rose@leopard:/home_leopard/rose/Txt/projects/IVD_soeren/Cameras/Phytec(266)$ ll tmp/ insgesamt 22896 -rw-r----- 1 rose rose 713492 5. Feb 15:32 scene.png -rw-r----- 1 rose rose 654966 5. Feb 15:40 scene00001.png -rw-r----- 1 rose rose 467737 5. Feb 15:40 scene00051.png ... -rw-r----- 1 rose rose 468453 5. Feb 15:41 scene02351.png Often I had the feeling that the commands never finishes and I killed it with ^C. Maybe I was not waiting long enough. Why vlc needs so much time? Then there is a second problem, the image which I got with the --scene-replace argument has a mean intensity of about 148: rose@leopard:/home_leopard/rose/Txt/projects/IVD_soeren/Cameras/Phytec(270)$ identify -verbose tmp/scene.png | grep "Channel statistics:\|Overall\|mean" Channel statistics: mean: 146.354 (0.573935) mean: 150.821 (0.591456) mean: 145.737 (0.571517) Overall: mean: 147.637 (0.578969) The intensity of the remaining images (without -scene-replace argument) starts with 65 all remaining images have a mean intensity of about 35: rose@leopard:/home_leopard/rose/Txt/projects/IVD_soeren/Cameras/Phytec(271)$ identify -verbose tmp/scene*.png | grep "Channel statistics:\|Overall\|mean" Channel statistics: mean: 146.354 (0.573935) mean: 150.821 (0.591456) mean: 145.737 (0.571517) Overall: mean: 147.637 (0.578969) Channel statistics: mean: 58.5689 (0.229682) mean: 66.3934 (0.260366) mean: 67.5334 (0.264837) Overall: mean: 64.1653 (0.251628) Channel statistics: mean: 29.6748 (0.116372) mean: 35.9216 (0.140869) mean: 39.2059 (0.153749) Overall: mean: 34.9341 (0.136996) Channel statistics: mean: 29.7021 (0.116479) mean: 35.9425 (0.140951) mean: 39.3634 (0.154366) Overall: mean: 35.0026 (0.137265) Channel statistics: mean: 29.6673 (0.116342) mean: 35.8888 (0.14074) mean: 39.2923 (0.154087) Overall: mean: 34.9495 (0.137057) ... Channel statistics: mean: 29.544 (0.115859) mean: 35.5772 (0.139518) mean: 38.7538 (0.151976) Overall: mean: 34.625 (0.135784) Channel statistics: mean: 28.9655 (0.11359) mean: 34.9071 (0.13689) mean: 37.9856 (0.148963) Overall: mean: 33.9527 (0.133148) rose@leopard:/home_leopard/rose/Txt/projects/IVD_soeren/Cameras/Phytec(274)$ uvcdynctrl -g 'Exposure (Absolute)' 70 rose@leopard:/home_leopard/rose/Txt/projects/IVD_soeren/Cameras/Phytec(276)$ uvcdynctrl -g 'Exposure, Auto' 1 I did a further test with a higher exposure time: rose@leopard:/home_leopard/rose/Txt/projects/IVD_soeren/Cameras/Phytec(277)$ uvcdynctrl -s 'Exposure (Absolute)' 250 rose@leopard:/home_leopard/rose/Txt/projects/IVD_soeren/Cameras/Phytec(278)$ rm tmp/* rose@leopard:/home_leopard/rose/Txt/projects/IVD_soeren/Cameras/Phytec(279)$ time cvlc v4l2:///dev/video0 -Vdummy --no-audio --run-time 1 --scene-path ./tmp --scene-format png --video-filter scene vlc://quit VLC media player 2.1.2 Rincewind (revision 2.1.2-0-ga4c4876) [0x1682cb8] dummy interface: using the dummy interface module... Fontconfig warning: FcPattern object size does not accept value "0" Fontconfig warning: FcPattern object size does not accept value "0" Fontconfig warning: FcPattern object size does not accept value "0" Fontconfig warning: FcPattern object size does not accept value "0" ^C real 14m29.589s user 0m47.027s sys 0m7.899s The programm does not finish after almost 15 minutes, I had to kill it. 437 images has been created. The first image has a mean intensity of 135, for the remaining the intensity decreases continously from 131 to 110. Should I generally forget the first two or three images, because there is still some initialization of the camera? Reproducible: Always
Well, I run vlc-2.0.7 myself because I have recording related problems in later versions of vlc; I think they are similar to yours but different in the way it is expressed, in my case I have some problem with heavy audio stuttering as well as the screen being laggy (sometimes it keeps the same frame or so) or things like that (I've been bisecting a range of commits on that when I did last version bump, without succes). So, on vlc-2.0.7 I just get this: $ mkdir tmp $ time cvlc v4l2:///dev/video0 -Vdummy --no-audio --run-time 1 --scene-path ./tmp --scene-replace --scene-format png --video-filter scene vlc://quit VLC media player 2.0.7 Twoflower (revision 2.0.6-54-g7dd7e4d) [0x6bf738] dummy interface: using the dummy interface module... [0x7f0118001538] idummy demux: command `quit' real 0m2.105s user 0m0.048s sys 0m0.013s Upon repetition of about 10 runs, it stays lower than four seconds; and upon checking some other commands you gave, it is the case for all of them. I'll try out your version of vlc towards this weekend to see if differs; if it does, it may be possible to automate bisecting this with a simple condition that the amount of time should be lower than 8 seconds or so. Such that I don't need to do manual involvement; though, having previously bisected it it can happen that some of the versions don't compile due to inconsistencies with libraries. I'm not sure about your other problem, I think I'm missing some knowledge and/or background on that (or rather, I'm not used to the terms); but I'll try to test that out, as well as to compare it, when I get to do that testing.
08 May 2015; Agostino Sarubbo <ago@gentoo.org> -vlc-2.1.2.ebuild: Drop 2.1.2
(In reply to jospezial from comment #2) > 08 May 2015; Agostino Sarubbo <ago@gentoo.org> -vlc-2.1.2.ebuild: > Drop 2.1.2 Thanks for noticing ! :)
