[FFmpeg-user] FLV streaming, severe audio sync issues

[Rena]

I'm trying to capture from my screen to stream to twitch.tv RTMP server,
but the audio is always going way out of sync. After one minute of
recording the audio is 4 seconds behind. I've tried everything I can find
and nothing is helping. Updating to a recent ffmpeg build only seems to
have made it worse.

For testing I have it recording to a local file instead of to RTMP server:
$ ffmpeg -f pulse -sample_rate 22050 -i
alsa_output.pci-0000_00_14.2.analog-stereo.monitor -f x11grab -show_region
1 -s 850x480 -r 12 -i :0.0+3160,200 -vcodec libx264 -s 850x480 -b:v 384k
-b:a 64k -threads 0 -g 3 -f flv out.flv
ffmpeg version N-51651-g1fabd95 Copyright (c) 2000-2013 the FFmpeg
developers
  built on Apr  6 2013 21:44:28 with gcc 4.7 (Ubuntu/Linaro 4.7.2-2ubuntu1)
  configuration: --enable-gpl --enable-version3 --enable-nonfree
--enable-avresample --enable-avisynth --enable-libass --enable-libfreetype
--enable-libmp3lame --enable-libopencv --enable-libpulse --enable-librtmp
--enable-libtheora --enable-libtwolame --enable-libv4l2 --enable-libvpx
--enable-libx264 --enable-openssl --enable-x11grab
  libavutil      52. 25.100 / 52. 25.100
  libavcodec     55.  2.100 / 55.  2.100
  libavformat    55.  1.100 / 55.  1.100
  libavdevice    55.  0.100 / 55.  0.100
  libavfilter     3. 49.100 /  3. 49.100
  libavresample   1.  1.  0 /  1.  1.  0
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
Guessed Channel Layout for  Input Stream #0.0 : stereo
Input #0, pulse, from 'alsa_output.pci-0000_00_14.2.analog-stereo.monitor':
  Duration: N/A, start: 0.000000, bitrate: 705 kb/s
    Stream #0:0: Audio: pcm_s16le, 22050 Hz, stereo, s16, 705 kb/s
[x11grab @ 0x25b84a0] device: :0.0+3160,200 -> display: :0.0 x: 3160 y: 200
width: 850 height: 480
[x11grab @ 0x25b84a0] shared memory extension found
Input #1, x11grab, from ':0.0+3160,200':
  Duration: N/A, start: 1366150061.077213, bitrate: 156672 kb/s
    Stream #1:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 850x480, 156672
kb/s, 12 tbr, 1000k tbn, 12 tbc
No pixel format specified, yuv444p for H.264 encoding chosen.
Use -pix_fmt yuv420p for compatibility with outdated media players.
[libx264 @ 0x25d0180] using cpu capabilities: MMX2 SSE2Fast SSSE3
FastShuffle SSE4.2 AVX XOP FMA4 SSEMisalign LZCNT
[libx264 @ 0x25d0180] profile High 4:4:4 Predictive, level 2.2, 4:4:4 8-bit
[libx264 @ 0x25d0180] 264 - core 123 r2189 35cf912 - H.264/MPEG-4 AVC codec
- Copyleft 2003-2012 - 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=12 sliced_threads=0 nr=0 decimate=1
interlaced=0 bluray_compat=0 constrained_intra=0 bframes=2 b_pyramid=2
b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=3
keyint_min=1 scenecut=40 intra_refresh=0 rc_lookahead=3 rc=abr mbtree=1
bitrate=384 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40
aq=1:1.00
Output #0, flv, to 'out.flv':
  Metadata:
    encoder         : Lavf55.1.100
    Stream #0:0: Video: h264 ([7][0][0][0] / 0x0007), yuv444p, 850x480,
q=-1--1, 384 kb/s, 1k tbn, 12 tbc
    Stream #0:1: Audio: mp3 ([2][0][0][0] / 0x0002), 22050 Hz, stereo,
s16p, 64 kb/s
Stream mapping:
  Stream #1:0 -> #0:0 (rawvideo -> libx264)
  Stream #0:0 -> #0:1 (pcm_s16le -> libmp3lame)
Press [q] to stop, [?] for help
[swscaler @ 0x2592320] Warning: data is not aligned! This can lead to a
speedloss
frame= 1269 fps= 12 q=32766.0 Lsize=    6223kB time=00:01:50.54 bitrate=
461.2kbits/s
video:5267kB audio:864kB subtitle:0 global headers:0kB muxing overhead
1.488966%
[libx264 @ 0x25d0180] frame I:424   Avg QP:38.55  size: 11698
[libx264 @ 0x25d0180] frame P:558   Avg QP:46.10  size:   622
[libx264 @ 0x25d0180] frame B:287   Avg QP:47.69  size:   300
[libx264 @ 0x25d0180] consecutive B-frames: 54.8% 45.2%  0.0%
[libx264 @ 0x25d0180] mb I  I16..4: 34.9% 47.8% 17.3%
[libx264 @ 0x25d0180] mb P  I16..4:  2.0%  2.7%  0.2%  P16..4:  5.2%  0.7%
0.2%  0.0%  0.0%    skip:88.9%
[libx264 @ 0x25d0180] mb B  I16..4:  0.1%  0.4%  0.0%  B16..8:  6.4%  0.3%
0.0%  direct: 0.2%  skip:92.5%  L0:39.6% L1:59.5% BI: 0.9%
[libx264 @ 0x25d0180] final ratefactor: 39.24
[libx264 @ 0x25d0180] 8x8 transform intra:48.4% inter:80.1%
[libx264 @ 0x25d0180] coded y,u,v intra: 28.2% 18.4% 18.5% inter: 0.4% 0.5%
0.5%
[libx264 @ 0x25d0180] i16 v,h,dc,p: 46% 48%  4%  2%
[libx264 @ 0x25d0180] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 26% 29%  4%  3%
3%  4%  2%  6%
[libx264 @ 0x25d0180] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 32% 31% 13%  4%  6%
4%  4%  3%  3%
[libx264 @ 0x25d0180] Weighted P-Frames: Y:0.9% UV:0.9%
[libx264 @ 0x25d0180] ref P L0: 94.7%  1.6%  3.7%
[libx264 @ 0x25d0180] kb/s:407.99


The system has no trouble handling the load, but the resulting video always
has severe audio lag.
-- 
Sent from my Game Boy.