[FFmpeg-user] audio is out of sync and "ALSA buffer xrun"

Mon Feb 24 17:15:21 CET 2014

first 3 rows of your tcpdump log are the initial TCP handshake. This is not an average but RTT is the diff of the first 2 ts: ie 50 ms.

RTMP handshake is complete after this line:

22:21:13.187108 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack 3074, win 23, options [nop,nop,TS val 1662742063 ecr 37145925], length 0

but setting up the stream channel is not over yet as the client will still need to send RTMP commands to start the stream.

So you spend much more time just setting up your RTMP link (~543 ms) than the size of your ALSA buffer size (340 ms). If ffmpeg do not preinitialize the network output sink before starting the capture, IMHO, that may explain why you experience the ALSA buffer xrun.

> -----Original Message-----
> From: ffmpeg-user-bounces at ffmpeg.org [mailto:ffmpeg-user-
> bounces at ffmpeg.org] On Behalf Of YuGiOhJCJ Mailing-List
> Sent: Saturday, February 22, 2014 4:27 PM
> To: FFmpeg user questions
> Subject: Re: [FFmpeg-user] audio is out of sync and "ALSA buffer xrun"
>
> Sorry I was wrong.
> In fact, I need to firstly run ffmpeg, then I watch the content of the
> /proc/asound/card0/pcm0c/sub0/hw_params file.
>
> So, this is what I have done on a first terminal:
> $ ffmpeg -y -f alsa -i default -f x11grab -r 10 -s 640x480 -async 1 -i :0.0 -strict -2
> -c:a aac -c:v libx264 -pix_fmt yuv420p -preset ultrafast -s 640x480 -threads 0 -
> ar 44100 -b:a 64k -b:v 64k -bufsize 64k -f flv "rtmp://live-
> fra.twitch.tv/app/`cat ~/twitch.key`"
>
> And this is what I have done on a second terminal:
> $ cat /proc/asound/card0/pcm0c/sub0/hw_params
> access: MMAP_INTERLEAVED
> format: S32_LE
> subformat: STD
> channels: 2
> rate: 48000 (48000/1)
> period_size: 1024
> buffer_size: 16384
>
> So, 16384/48000 = 0.34 (mine value is smaller than your value).
>
> Indeed, the ping on live-fra.twitch.tv is not possible.
> So, I have tested with tcpdump:
> $ sudo tcpdump -ni eth0 host live-fra.twitch.tv
> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
> 22:21:12.644355 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [S], seq
> 2241789542, win 14600, options [mss 1460,sackOK,TS val 37145446 ecr
> 0,nop,wscale 7], length 0
> 22:21:12.695150 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [S.], seq
> 2043124064, ack 2241789543, win 5792, options [mss 1436,sackOK,TS val
> 1662742014 ecr 37145446,nop,wscale 9], length 0
> 22:21:12.695178 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [.], ack 1, win
> 115, options [nop,nop,TS val 37145497 ecr 1662742014], length 0
> 22:21:12.695386 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [.], seq
> 1:1425, ack 1, win 115, options [nop,nop,TS val 37145498 ecr 1662742014],
> length 1424
> 22:21:12.695439 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 1425:1538, ack 1, win 115, options [nop,nop,TS val 37145498 ecr 1662742014],
> length 113
> 22:21:12.757727 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack 1425,
> win 17, options [nop,nop,TS val 1662742020 ecr 37145498], length 0
> 22:21:12.759387 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack 1538,
> win 17, options [nop,nop,TS val 1662742020 ecr 37145498], length 0
> 22:21:13.120657 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], seq
> 1:1425, ack 1538, win 17, options [nop,nop,TS val 1662742056 ecr 37145498],
> length 1424
> 22:21:13.120676 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [.], ack 1425,
> win 137, options [nop,nop,TS val 37145923 ecr 1662742056], length 0
> 22:21:13.122851 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [P.], seq
> 1425:3074, ack 1538, win 17, options [nop,nop,TS val 1662742056 ecr
> 37145498], length 1649
> 22:21:13.122861 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [.], ack 3074,
> win 163, options [nop,nop,TS val 37145925 ecr 1662742056], length 0
> 22:21:13.122886 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [.], seq
> 1538:2962, ack 3074, win 163, options [nop,nop,TS val 37145925 ecr
> 1662742056], length 1424
> 22:21:13.122891 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 2962:3074, ack 3074, win 163, options [nop,nop,TS val 37145925 ecr
> 1662742056], length 112
> 22:21:13.186668 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack 2962,
> win 23, options [nop,nop,TS val 1662742063 ecr 37145925], length 0
> 22:21:13.187108 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack 3074,
> win 23, options [nop,nop,TS val 1662742063 ecr 37145925], length 0
> 22:21:13.187120 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 3074:3233, ack 3074, win 163, options [nop,nop,TS val 37145989 ecr
> 1662742063], length 159
> 22:21:13.238634 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack 3233,
> win 29, options [nop,nop,TS val 1662742068 ecr 37145989], length 0
> 22:21:13.428350 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [P.], seq
> 3074:3414, ack 3233, win 29, options [nop,nop,TS val 1662742087 ecr
> 37145989], length 340
> 22:21:13.428512 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 3233:3245, ack 3414, win 185, options [nop,nop,TS val 37146231 ecr
> 1662742087], length 12
> 22:21:13.479104 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack 3245,
> win 29, options [nop,nop,TS val 1662742092 ecr 37146231], length 0
> 22:21:13.479122 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 3245:3440, ack 3414, win 185, options [nop,nop,TS val 37146281 ecr
> 1662742092], length 195
> 22:21:13.531599 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack 3440,
> win 34, options [nop,nop,TS val 1662742097 ecr 37146281], length 0
> 22:21:13.720507 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [P.], seq
> 3414:3643, ack 3440, win 34, options [nop,nop,TS val 1662742116 ecr
> 37146281], length 229
> 22:21:13.720645 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 3440:3452, ack 3643, win 207, options [nop,nop,TS val 37146523 ecr
> 1662742116], length 12
> 22:21:13.769840 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack 3452,
> win 34, options [nop,nop,TS val 1662742121 ecr 37146523], length 0
> 22:21:13.769858 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 3452:3526, ack 3643, win 207, options [nop,nop,TS val 37146572 ecr
> 1662742121], length 74
> 22:21:13.820389 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack 3526,
> win 34, options [nop,nop,TS val 1662742126 ecr 37146572], length 0
> 22:21:14.376738 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [P.], seq
> 3643:3661, ack 3526, win 34, options [nop,nop,TS val 1662742182 ecr
> 37146572], length 18
> 22:21:14.377239 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [P.], seq
> 3661:3812, ack 3526, win 34, options [nop,nop,TS val 1662742182 ecr
> 37146572], length 151
> 22:21:14.377272 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [.], ack 3812,
> win 230, options [nop,nop,TS val 37147179 ecr 1662742182], length 0
> 22:21:14.479079 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 3526:3538, ack 3812, win 230, options [nop,nop,TS val 37147281 ecr
> 1662742182], length 12
> 22:21:14.479876 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [.], seq
> 3538:4962, ack 3812, win 230, options [nop,nop,TS val 37147282 ecr
> 1662742182], length 1424
> 22:21:14.479955 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [.], seq
> 4962:6386, ack 3812, win 230, options [nop,nop,TS val 37147282 ecr
> 1662742182], length 1424
> 22:21:14.480013 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [.], seq
> 6386:7810, ack 3812, win 230, options [nop,nop,TS val 37147282 ecr
> 1662742182], length 1424
> 22:21:14.503009 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [.], seq
> 7810:9234, ack 3812, win 230, options [nop,nop,TS val 37147305 ecr
> 1662742182], length 1424
> 22:21:14.529153 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack 3538,
> win 34, options [nop,nop,TS val 1662742197 ecr 37147281], length 0
> 22:21:14.529180 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 9234:9982, ack 3812, win 230, options [nop,nop,TS val 37147331 ecr
> 1662742197], length 748
> 22:21:14.542926 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack 4962,
> win 40, options [nop,nop,TS val 1662742199 ecr 37147282], length 0
> 22:21:14.555229 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack 6386,
> win 46, options [nop,nop,TS val 1662742200 ecr 37147282], length 0
> 22:21:14.568355 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack 7810,
> win 51, options [nop,nop,TS val 1662742201 ecr 37147282], length 0
> 22:21:14.581640 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack 9234,
> win 57, options [nop,nop,TS val 1662742202 ecr 37147305], length 0
> 22:21:14.587551 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack 9982,
> win 62, options [nop,nop,TS val 1662742203 ecr 37147331], length 0
> 22:21:14.587569 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 9982:10524, ack 3812, win 230, options [nop,nop,TS val 37147390 ecr
> 1662742203], length 542
> 22:21:14.642760 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack
> 10524, win 68, options [nop,nop,TS val 1662742208 ecr 37147390], length 0
> 22:21:14.642783 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 10524:10886, ack 3812, win 230, options [nop,nop,TS val 37147445 ecr
> 1662742208], length 362
> 22:21:14.696406 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack
> 10886, win 74, options [nop,nop,TS val 1662742214 ecr 37147445], length 0
> 22:21:14.696430 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 10886:11523, ack 3812, win 230, options [nop,nop,TS val 37147499 ecr
> 1662742214], length 637
> 22:21:14.750972 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [.], seq
> 11523:12947, ack 3812, win 230, options [nop,nop,TS val 37147553 ecr
> 1662742214], length 1424
> 22:21:14.751087 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [.], seq
> 12947:14371, ack 3812, win 230, options [nop,nop,TS val 37147553 ecr
> 1662742214], length 1424
> 22:21:14.752174 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack
> 11523, win 79, options [nop,nop,TS val 1662742219 ecr 37147499], length 0
> 22:21:14.752192 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 14371:15191, ack 3812, win 230, options [nop,nop,TS val 37147554 ecr
> 1662742219], length 820
> 22:21:14.815181 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack
> 12947, win 85, options [nop,nop,TS val 1662742226 ecr 37147553], length 0
> 22:21:14.822662 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [.], seq
> 15191:16615, ack 3812, win 230, options [nop,nop,TS val 37147625 ecr
> 1662742226], length 1424
> 22:21:14.825566 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack
> 14371, win 90, options [nop,nop,TS val 1662742227 ecr 37147553], length 0
> 22:21:14.834446 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack
> 15191, win 96, options [nop,nop,TS val 1662742228 ecr 37147554], length 0
> 22:21:14.834466 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 16615:17456, ack 3812, win 230, options [nop,nop,TS val 37147637 ecr
> 1662742228], length 841
> 22:21:14.884980 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack
> 16615, win 102, options [nop,nop,TS val 1662742233 ecr 37147625], length 0
> 22:21:14.893509 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack
> 17456, win 107, options [nop,nop,TS val 1662742234 ecr 37147637], length 0
> 22:21:14.893540 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 17456:18418, ack 3812, win 230, options [nop,nop,TS val 37147696 ecr
> 1662742234], length 962
> 22:21:14.952716 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack
> 18418, win 113, options [nop,nop,TS val 1662742240 ecr 37147696], length 0
> 22:21:14.952738 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 18418:18867, ack 3812, win 230, options [nop,nop,TS val 37147755 ecr
> 1662742240], length 449
> 22:21:15.006909 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack
> 18867, win 118, options [nop,nop,TS val 1662742245 ecr 37147755], length 0
> 22:21:15.006935 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 18867:19687, ack 3812, win 230, options [nop,nop,TS val 37147809 ecr
> 1662742245], length 820
> 22:21:15.063867 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack
> 19687, win 124, options [nop,nop,TS val 1662742251 ecr 37147809], length 0
> 22:21:15.063891 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 19687:20408, ack 3812, win 230, options [nop,nop,TS val 37147866 ecr
> 1662742251], length 721
> 22:21:15.120557 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack
> 20408, win 126, options [nop,nop,TS val 1662742256 ecr 37147866], length 0
> 22:21:15.120580 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 20408:20896, ack 3812, win 230, options [nop,nop,TS val 37147923 ecr
> 1662742256], length 488
> 22:21:15.174701 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack
> 20896, win 126, options [nop,nop,TS val 1662742262 ecr 37147923], length 0
> 22:21:15.208000 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 20896:20904, ack 3812, win 230, options [nop,nop,TS val 37148010 ecr
> 1662742262], length 8
> 22:21:15.258457 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack
> 20904, win 126, options [nop,nop,TS val 1662742270 ecr 37148010], length 0
> 22:21:15.258480 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 20904:21924, ack 3812, win 230, options [nop,nop,TS val 37148061 ecr
> 1662742270], length 1020
> 22:21:15.317611 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack
> 21924, win 126, options [nop,nop,TS val 1662742276 ecr 37148061], length 0
> 22:21:15.317635 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 21924:23184, ack 3812, win 230, options [nop,nop,TS val 37148120 ecr
> 1662742276], length 1260
> 22:21:15.378962 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack
> 23184, win 126, options [nop,nop,TS val 1662742282 ecr 37148120], length 0
> 22:21:15.406632 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 23184:23192, ack 3812, win 230, options [nop,nop,TS val 37148209 ecr
> 1662742282], length 8
> 22:21:15.457324 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack
> 23192, win 126, options [nop,nop,TS val 1662742290 ecr 37148209], length 0
> 22:21:15.457349 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 23192:24478, ack 3812, win 230, options [nop,nop,TS val 37148259 ecr
> 1662742290], length 1286
> 22:21:15.518648 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack
> 24478, win 126, options [nop,nop,TS val 1662742296 ecr 37148259], length 0
> 22:21:15.518671 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 24478:25845, ack 3812, win 230, options [nop,nop,TS val 37148321 ecr
> 1662742296], length 1367
> 22:21:15.581263 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack
> 25845, win 126, options [nop,nop,TS val 1662742302 ecr 37148321], length 0
> 22:21:15.606279 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 25845:25853, ack 3812, win 230, options [nop,nop,TS val 37148408 ecr
> 1662742302], length 8
> 22:21:15.656219 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack
> 25853, win 126, options [nop,nop,TS val 1662742310 ecr 37148408], length 0
> 22:21:15.656241 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 25853:26782, ack 3812, win 230, options [nop,nop,TS val 37148458 ecr
> 1662742310], length 929
> 22:21:15.706905 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [.], seq
> 26782:28206, ack 3812, win 230, options [nop,nop,TS val 37148509 ecr
> 1662742310], length 1424
> 22:21:15.714573 IP 199.9.254.236.1935 > 192.168.0.2.42053: Flags [.], ack
> 26782, win 126, options [nop,nop,TS val 1662742316 ecr 37148458], length 0
> 22:21:15.714593 IP 192.168.0.2.42053 > 199.9.254.236.1935: Flags [P.], seq
> 28206:28277, ack 3812, win 230, options [nop,nop,TS val 37148517 ecr
> 1662742316], length 71
> ^C
> 86 packets captured
> 92 packets received by filter
> 0 packets dropped by kernel
>
> Do you see the RTT value here?
>
> On Fri, 21 Feb 2014 14:35:43 +0100
> YuGiOhJCJ Mailing-List <yugiohjcj-mailinglist at laposte.net> wrote:
>
> > I have recompiled my kernel.
> > Now, I have this:
> > $ cat /proc/asound/card0/pcm0c/sub0/hw_params
> > closed
> >
> > What it means, please?
> >
> > On Tue, 18 Feb 2014 17:02:37 +0000
> > LANGLOIS Olivier PIS -EXT <olivier.pis.langlois at transport.alstom.com>
> wrote:
> >
> > > If you want to have them, you need to recompile the kernel with this
> setting:
> > >
> > > lano1106 at hpmini ~/dev/linux-ck/src/linux-3.12 $ zgrep SND_VERBOSE
> /proc/config.gz
> > > CONFIG_SND_VERBOSE_PROCFS=y
> > > # CONFIG_SND_VERBOSE_PRINTK is not set
> > >
> > > You can use my numbers, it should give you some idea:
> > >
> > > lano1106 at hpmini /proc/asound/card0/pcm0c/sub0 $ cat hw_params
> > > access: RW_INTERLEAVED
> > > format: S16_LE
> > > subformat: STD
> > > channels: 2
> > > rate: 44100 (44100/1)
> > > period_size: 11025
> > > buffer_size: 22050
> > >
> > > 22050/44100 = 0.5 (yours could be smaller)
> > >
> > >
> http://wwwimages.adobe.com/www.adobe.com/content/dam/Adobe/en/
> devnet/rtmp/pdf/rtmp_specification_1.0.pdf
> > >
> > > The rtmp handshake has 3 messages exchanges.
> > >
> > > take the rtt from 'ping live-fra.twitch.tv', multiply by 3 and this value must
> be smaller than 0.5 or whatever you buffer_time is.
> > >
> > > this server doesn't seem to reply to ICMP echo request so you can get
> some timing insight by recording your rtmp exchange with wireshark
> something like that.
> > >
> > >
> > > > -----Original Message-----
> > > > From: ffmpeg-user-bounces at ffmpeg.org [mailto:ffmpeg-user-
> > > > bounces at ffmpeg.org] On Behalf Of YuGiOhJCJ Mailing-List
> > > > Sent: Tuesday, February 18, 2014 11:44 AM
> > > > To: FFmpeg user questions
> > > > Subject: Re: [FFmpeg-user] audio is out of sync and "ALSA buffer xrun"
> > > >
> > > > It seems I have not the same file hierarchy than you in this folder:
> > > > $ ls -l /proc/asound/card0/
> > > > total 0
> > > > -r--r--r-- 1 root root 0 Feb 18 17:42 codec#0
> > > > -r--r--r-- 1 root root 0 Feb 18 17:42 id
> > > >
> > >
> > >
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