[FFmpeg-user] unable to capture desktop session using x11grab on debian jessie with ffmpeg 3.1.4

Tue Nov 8 14:17:55 EET 2016

Built from the latest git source seems not help.

following command runs about 15+ seconds. nothing was captured. If I add -loglevel debug,  this log keep being printed:

cur_dts is invalid (this is harmless if it occurs once at the start per stream)
[rawvideo @ 0x3234840] PACKET SIZE: 4196352, STRIDE: 5464

Here is the whole command line and output:

➜  ffmpeg git:(master) ✗ ./ffmpeg  -s 1366x768 -f x11grab -i :0.0 -c libx264 -crf 28 -preset ultrafast /tmp/output.mp4
ffmpeg version N-82294-g6f0a171 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 4.9.2 (Debian 4.9.2-10)
  configuration: --disable-yasm --enable-x11grab --enable-gpl --enable-libx264
  libavutil      55. 35.100 / 55. 35.100
  libavcodec     57. 66.101 / 57. 66.101
  libavformat    57. 57.100 / 57. 57.100
  libavdevice    57.  2.100 / 57.  2.100
  libavfilter     6. 66.100 /  6. 66.100
  libswscale      4.  3.100 /  4.  3.100
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
[x11grab @ 0x363f4e0] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #0, x11grab, from ':0.0':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1366x768, 29.97 fps, 1000k tbr, 1000k tbn, 1000k tbc
File '/tmp/output.mp4' 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Use -pix_fmt yuv420p for compatibility with outdated media players.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 @ 0x3649060] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
[libx264 @ 0x3649060] profile High 4:4:4 Predictive, level 3.2, 4:4:4 8-bit
[libx264 @ 0x3649060] 264 - core 142 r2431 a5831aa - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=6 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=28.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
Output #0, mp4, to '/tmp/output.mp4':
  Metadata:
    encoder         : Lavf57.57.100
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv444p, 1366x768, q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc
    Metadata:
      encoder         : Lavc57.66.101 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[swscaler @ 0x3655080] Warning: data is not aligned! This can lead to a speedloss
frame=    3 fps=0.1 q=-1.0 Lsize=     335kB time=00:00:00.06 bitrate=41099.8kbits/s dup=0 drop=464 speed=0.0024x
video:334kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.242560%
[libx264 @ 0x3649060] frame I:1     Avg QP:25.00  size:229658
[libx264 @ 0x3649060] frame P:2     Avg QP:32.00  size: 55964
[libx264 @ 0x3649060] mb I  I16..4: 100.0%  0.0%  0.0%
[libx264 @ 0x3649060] mb P  I16..4: 29.6%  0.0%  0.0%  P16..4:  7.8%  0.0%  0.0%  0.0%  0.0%    skip:62.6%
[libx264 @ 0x3649060] coded y,u,v intra: 32.5% 28.9% 27.7% inter: 7.3% 4.6% 4.0%
[libx264 @ 0x3649060] i16 v,h,dc,p: 55% 40%  3%  2%
[libx264 @ 0x3649060] kb/s:27299.50

On Tue, 2016-11-08 at 12:31 +0100, Carl Eugen Hoyos wrote:

2016-11-08 6:51 GMT+01:00 肖文良 <xiaowenliang at youku.com<mailto:xiaowenliang at youku.com>>:

> I'am trying to capture my X11 desktop sessoin using ffmpeg, but the same
> command capture nothing on my new Lenovo T450 laptop running Debian
> Jessie.

While Debian is now very up-to-date, please understand that we can only
support current FFmpeg, there are (several iiuc) Debian support resources.

> The command I used was:  ffmpeg -loglevel debug -s 1366x768 -f x11grab
> -i :0.0 -c libx264 -crf 28 -preset ultrafast /tmp/output.mp4
>
> And the detailed output of ffmepg at:  http://pastebin.com/rM8QvkQm

For future questions: Please remember not to use external resources
for the console output, paste it in your email.

Please test current FFmpeg git head, an improvement was committed
recently.

Carl Eugen
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--
Thanks,
肖文良
Programmer at youku&tudou
Mob: 18610724876
Addr: 北京市海淀区中关村海淀大街8号中钢国际广场5层