[FFmpeg-trac] #3068(undetermined:new): x11grab doesn't work with PseudoColor visuals

[FFmpeg]

#3068: x11grab doesn't work with PseudoColor visuals
-------------------------------------+-------------------------------------
             Reporter:  groupboard   |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------

Comment (by groupboard):

 Just run "Xvfb :1" and it will set up a PseudoColor visual (i.e. a
 palettized 8-bit colour scheme rather than 24- or 32-bit RGB). At least,
 it does on Centos 5, but you can confirm by running "xwininfo -root". Then
 just run ffmpeg with "-x11grab -i :1.0" and other appropriate options and
 you'll get a black screen no matter what you try. Apparently it has been a
 bug since 2007 but nobody has reported it here yet.

 http://ffmpeg.org/pipermail/ffmpeg-devel/2007-January/028361.html

 Here is a sample ffmpeg command:

 ffmpeg -f x11grab -s 1024x768 -r 25 -i :1.0 output2.mkv
 ffmpeg version N-57300-g2f9422d Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Oct 21 2013 15:25:29 with gcc 4.1.1 (GCC) 20070105 (Red Hat
 4.1.1-52)
   configuration: --enable-version3 --enable-libx264 --enable-gpl --enable-
 postproc --enable-nonfree --enable-x11grab
   libavutil      52. 47.101 / 52. 47.101
   libavcodec     55. 37.102 / 55. 37.102
   libavformat    55. 19.103 / 55. 19.103
   libavdevice    55.  4.100 / 55.  4.100
   libavfilter     3. 88.102 /  3. 88.102
   libswscale      2.  5.101 /  2.  5.101
   libswresample   0. 17.104 /  0. 17.104
   libpostproc    52.  3.100 / 52.  3.100
 [x11grab @ 0x93a4d80] device: :1.0 -> display: :1.0 x: 0 y: 0 width: 1024
 height: 768
 [x11grab @ 0x93a4d80] shared memory extension found
 Input #0, x11grab, from ':1.0':
   Duration: N/A, start: 1382487455.007037, bitrate: 157286 kb/s
     Stream #0:0: Video: rawvideo, pal8, 1024x768, 157286 kb/s, 25 tbr,
 1000k tbn, 25 tbc
 File 'output2.mkv' already exists. Overwrite ? [y/N] y
 No pixel format specified, yuv444p for H.264 encoding chosen.
 Use -pix_fmt yuv420p for compatibility with outdated media players.
 [libx264 @ 0x93ab360] using cpu capabilities: MMX2 SSE2 SSE3 Cache64
 [libx264 @ 0x93ab360] profile High 4:4:4 Predictive, level 3.1, 4:4:4
 8-bit
 [libx264 @ 0x93ab360] 264 - core 138 r2358 9e941d1 - H.264/MPEG-4 AVC
 codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options:
 cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1
 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1
 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=4 threads=1
 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0
 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1
 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25
 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0
 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
 Output #0, matroska, to 'output2.mkv':
   Metadata:
     encoder         : Lavf55.19.103
     Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv444p,
 1024x768, q=-1--1, 1k tbn, 25 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (rawvideo -> libx264)
 Press [q] to stop, [?] for help
 [swscaler @ 0x9398ea0] Warning: data is not aligned! This can lead to a
 speedloss
 frame=   49 fps= 18 q=28.0 Lsize=       3kB time=00:00:01.88 bitrate=
 14.9kbits/s
 video:3kB audio:0kB subtitle:0 global headers:0kB muxing overhead
 32.551098%
 [libx264 @ 0x93ab360] frame I:1     Avg QP: 9.00  size:   209
 [libx264 @ 0x93ab360] frame P:12    Avg QP: 9.58  size:    41
 [libx264 @ 0x93ab360] frame B:36    Avg QP:12.67  size:    34
 [libx264 @ 0x93ab360] consecutive B-frames:  2.0%  0.0%  0.0% 98.0%
 [libx264 @ 0x93ab360] mb I  I16..4:  0.0% 100.0%  0.0%
 [libx264 @ 0x93ab360] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  0.0%  0.0%
 0.0%  0.0%  0.0%    skip:100.0%
 [libx264 @ 0x93ab360] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.0%  0.0%
 0.0%  direct: 0.0%  skip:100.0%
 [libx264 @ 0x93ab360] 8x8 transform intra:100.0%
 [libx264 @ 0x93ab360] coded y,u,v intra: 0.0% 0.0% 0.0% inter: 0.0% 0.0%
 0.0%
 [libx264 @ 0x93ab360] i16 v,h,dc,p:  0%  0% 100%  0%
 [libx264 @ 0x93ab360] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  0%  0% 100%  0%  0%
 0%  0%  0%  0%
 [libx264 @ 0x93ab360] Weighted P-Frames: Y:0.0% UV:0.0%
 [libx264 @ 0x93ab360] kb/s:7.82

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/3068#comment:2>
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