[libav-bugs] [Bug 723] Unsynchronised x11grab and sound

bugzilla at libav.org bugzilla at libav.org
Sun Aug 3 20:48:08 CEST 2014


http://bugzilla.libav.org/show_bug.cgi?id=723

--- Comment #1 from crec <crecc23 at interia.pl> 2014-08-03 20:48:08 CEST ---
Created attachment 495
  --> http://bugzilla.libav.org/attachment.cgi?id=495
Resulting screencast with unsynchronised audio

Output of avconv command for this file. The output in main bug description is
for bigger file that I was unable to upload.
-----------------------
avconv version 9.14-6:9.14-0ubuntu0.14.04.1, Copyright (c) 2000-2014 the Libav
developers
  built on Jul 15 2014 13:57:40 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
[pulse @ 0xdb4ac0] Estimating duration from bitrate, this may be inaccurate
Guessed Channel Layout for  Input Stream #0.0 : stereo
Input #0, pulse, from 'alsa_output.pci-0000_00_1b.0.analog-stereo.monitor':
  Duration: N/A, start: 0.005819, bitrate: N/A
    Stream #0.0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
[x11grab @ 0xdb5360] device: :0+0,0 -> display: :0 x: 0 y: 0 width: 1366
height: 744
[x11grab @ 0xdb5360] shared memory extension  found
[x11grab @ 0xdb5360] Estimating duration from bitrate, this may be inaccurate
Input #1, x11grab, from ':0+0,0':
  Duration: N/A, start: 1407091363.602233, bitrate: 325217 kb/s
    Stream #1.0: Video: rawvideo, bgra, 1366x744, 325217 kb/s, 1000k tbn, 10
tbc
[libx264 @ 0xdcf420] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
[libx264 @ 0xdcf420] profile Constrained Baseline, level 3.2
[libx264 @ 0xdcf420] 264 - core 142 r2389 956c8d8 - 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=0 threads=3 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=10 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0
qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.25 aq=0
Output #0, mp4, to '/home/darek/Videos/Screencast from 2014-08-03
20:42:43.mp4':
  Metadata:
    encoder         : Lavf54.20.4
    Stream #0.0: Video: libx264, yuv420p, 1366x744, q=-1--1, 10 tbn, 10 tbc
    Stream #0.1: Audio: libvo_aacenc, 48000 Hz, stereo, s16, 200 kb/s
Stream mapping:
  Stream #1:0 -> #0:0 (rawvideo -> libx264)
  Stream #0:0 -> #0:1 (pcm_s16le -> libvo_aacenc)
Press ctrl-c to stop encoding
frame=  209 fps= 10 q=32766.0 Lsize=     813kB time=20.90 bitrate= 318.8kbits/s 
video:290kB audio:510kB global headers:0kB muxing overhead 1.592756%
[libx264 @ 0xdcf420] frame I:1     Avg QP:21.00  size: 60393
[libx264 @ 0xdcf420] frame P:208   Avg QP: 9.89  size:  1136
[libx264 @ 0xdcf420] mb I  I16..4: 100.0%  0.0%  0.0%
[libx264 @ 0xdcf420] mb P  I16..4:  0.7%  0.0%  0.0%  P16..4:  1.2%  0.0%  0.0%
 0.0%  0.0%    skip:98.1%
[libx264 @ 0xdcf420] coded y,uvDC,uvAC intra: 21.8% 20.1% 18.8% inter: 0.4%
0.8% 0.4%
[libx264 @ 0xdcf420] i16 v,h,dc,p: 63% 35%  1%  1%
[libx264 @ 0xdcf420] i8c dc,h,v,p: 53% 40%  7%  0%
[libx264 @ 0xdcf420] kb/s:113.54
Received signal 15: terminating.

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