Bug #5625
Many Continuity errors while using CXD2837ER (Astrometa white stick)
0%
Description
I'm running Ubuntu 18.04LTS, kernel updated to 5.0.10 to support the 2018 version of Astrometa USB stick.
The problem is, when watching DVB-C streams, I get continuously Continuity counter errors about every 5 secs, even in strong signal muxes.
But if I check the "Force old status" in TV adapters settings, the Continuity errors disappears, but there's no signal strength and SNR in status tab.
Maybe it's not a TVH bug but a kernel driver bug, I'm a linux newbie, I don't know how to check that.
Log is here
2019-05-06 11:11:36.207 dvr: /mnt/ST3T/nfs/炽热阿拉伯(2)-1.ts from adapter: "Sony CXD2837ER DVB-T/T2/C demodulator #0 : DVB-C #1", network: "DVB-C", mux: "363MHz", provider: "BGCTV", service: "CCTV9纪录高清"
2019-05-06 11:11:36.207 dvr: # type lang resolution aspect ratio sample rate channels
2019-05-06 11:11:36.207 dvr: 1 H264 1920x1080 ?
2019-05-06 11:11:36.207 dvr: 2 AC3 eng ? ?
2019-05-06 11:11:36.207 dvr: 3 CA
2019-05-06 11:11:36.207 dvr: 4 CA
2019-05-06 11:11:36.207 dvr: 5 CA
2019-05-06 11:11:36.207 dvr: 6 CA
2019-05-06 11:11:36.476 TS: DVB-C/363MHz/CCTV9纪录高清: H264 #6090 Continuity counter error (total 1) #6091 Continuity counter error (total 1)
2019-05-06 11:11:36.476 TS: DVB-C/363MHz/CCTV9纪录高清: AC3
2019-05-06 11:12:26.110 TS: DVB-C/363MHz/CCTV9纪录高清: H264 #6090 Continuity counter error (total 3) #6090 Continuity counter error (total 13)
2019-05-06 11:12:38.125 TS: DVB-C/363MHz/CCTV9纪录高清: H264
2019-05-06 11:12:49.042 TS: DVB-C/363MHz/CCTV9纪录高清: H264 #6090 Continuity counter error (total 20) #6091 Continuity counter error (total 2)
2019-05-06 11:12:56.674 TS: DVB-C/363MHz/CCTV9纪录高清: AC3
2019-05-06 11:12:59.923 TS: DVB-C/363MHz/CCTV9纪录高清: H264 #6090 Continuity counter error (total 28) #6090 Continuity counter error (total 34)
2019-05-06 11:13:09.791 tbl-pass: pass-eit: -: invalid checksum (len 67, errors 1)
2019-05-06 11:13:09.791 tbl-eit: eit: 363MHz in DVB-C: invalid checksum (len 67, errors 1)
2019-05-06 11:13:10.835 TS: DVB-C/363MHz/CCTV9纪录高清: H264
2019-05-06 11:13:11.992 TS: DVB-C/363MHz/CCTV9纪录高清: AC3 #6091 Continuity counter error (total 3) #6090 Continuity counter error (total 38)
2019-05-06 11:13:22.857 TS: DVB-C/363MHz/CCTV9纪录高清: H264
Files
History
Updated by Tiago Freire over 5 years ago
Updated by ly chen wrote:
I'm running Ubuntu 18.04LTS, kernel updated to 5.0.10 to support the 2018 version of Astrometa USB stick.
The problem is, when watching DVB-C streams, I get continuously Continuity counter errors about every 5 secs, even in strong signal muxes.
But if I check the "Force old status" in TV adapters settings, the Continuity errors disappears, but there's no signal strength and SNR in status tab.
Maybe it's not a TVH bug but a kernel driver bug, I'm a linux newbie, I don't know how to check that.(...)
The same situation over where, lots of continuity errors and the USB stick freezes after some time running and scrolling the channels.
Tvheadend on a LXC with Ubuntu 18.04, over Proxmox 6.
Updated by void walker about 5 years ago
Updated by somebody just wrote a kernel patch to address this issue:
https://lore.kernel.org/linux-media/deda32250ad32078b98eb41eb09d6d20050a6f9c.1570113429.git.mchehab+samsung@kernel.org/T/#u
Updated by Mauro Carvalho Chehab about 5 years ago
Updated by After some tests, I'm pretty sure this is not a Kernel bug, but, instead, a problem at tvheadend. On a quick look, the logic to decide to fall back to DVBv3 seems too complex than it should be. If FE_GET_PROPERTY returns a property with len > 0, then the Kernel driver uses DVBv5 to report stats. Calling a DVBv3 stat after that and mixing with the output of the stats property may cause too much I2C traffic at some devices and may cause problems.
So, the logic there should be something like:
/* Check if DVBv5 stats are available */
gotprop = 0;
if(ioctl_check(lfe, 0) && !lfe->lfe_old_status &&
!ioctl(lfe->lfe_fe_fd, FE_GET_PROPERTY, &dtv_prop)) {for (i = 0; i < dtv_prop.num; i++)
if (fe_properties[i].u.st.len)
break;
if (i < dtv_prop.num)
gotprop = 1;
}if (gotprop) {
/* Use only DVBv5 stats /
}
else {
/ Use only DVBv3 stats */
}I'm enclosing an untested patch cleaning up the stats logic to take this into account.
Updated by Jaroslav Kysela about 5 years ago
Updated by - Status changed from New to Fixed
Got it. Fixed in v4.3-1808-g691cce4a7 .
Updated by
Updated by Muhannad Shaheen almost 5 years ago
Updated by can confirm this is still an issue with CXD2837ER (Astrometa white stick)
linux: 5.3.0-40-generic #32~18.04.1-Ubuntu SMP Mon Feb 3 14:05:59 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
tvheadend: 4.3-1857~g221c29b40
Updated by Václav Ovsík over 4 years ago
Updated by I can confirm the problem too. Astrometa DVB-T2 & HTS Tvheadend 4.3-1857~g221c29b40
root@pi4:~# dmesg |fgrep DVB [ 5.350220] usb 1-1.4: dvb_usb_v2: found a 'Astrometa DVB-T2' in warm state [ 5.555480] dvbdev: DVB: registering new adapter (Astrometa DVB-T2) [ 5.646759] i2c i2c-7: cxd2841er_attach(): attaching CXD2837ER DVB-C/T/T2 frontend [ 5.646808] usb 1-1.4: DVB: registering adapter 0 frontend 0 (Realtek RTL2832 (DVB-T))... [ 5.646843] dvbdev: dvb_create_media_entity: media entity 'Realtek RTL2832 (DVB-T)' registered. [ 5.647128] usb 1-1.4: DVB: registering adapter 0 frontend 1 (Sony CXD2837ER DVB-T/T2/C demodulator)... [ 5.647152] dvbdev: dvb_create_media_entity: media entity 'Sony CXD2837ER DVB-T/T2/C demodulator' registered. [ 5.754656] rc rc0: Astrometa DVB-T2 as /devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.4/rc/rc0 [ 5.755055] input: Astrometa DVB-T2 as /devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.4/rc/rc0/input4 [ 5.766091] usb 1-1.4: dvb_usb_v2: 'Astrometa DVB-T2' successfully initialized and connected
on Raspberry Pi4 with RPi kernel:
Linux pi4 5.4.24-v7l+ #1 SMP Wed Mar 18 07:37:31 CET 2020 armv7l GNU/Linux
Seems to me, it is a kernel driver bug. When I run dvbv5-zap with option -m, there are continuity errors too.
zito@pi4:~/dvb-t2 $ timeout 15 dvbv5-zap -f 1 -c channel-618.conf 'CT 2 HD T2' -m &>zap.log zito@pi4:~/dvb-t2 $ fgrep continuity zap.log | head -10 17 1.99 p/s 2.920 Kbps 752 B 1 continuity errors 17 1.33 p/s 1.954 Kbps 752 B 1 continuity errors 2223 46.57 p/s 68.405 Kbps 26 KB 1 continuity errors 17 2.00 p/s 2.937 Kbps 1 KB 1 continuity errors 2223 46.74 p/s 68.647 Kbps 34 KB 1 continuity errors 2250 11.00 p/s 16.152 Kbps 8 KB 1 continuity errors 2723 46.49 p/s 68.280 Kbps 34 KB 1 continuity errors 17 1.59 p/s 2.342 Kbps 1 KB 1 continuity errors 2223 46.63 p/s 68.491 Kbps 43 KB 1 continuity errors 2250 13.95 p/s 20.489 Kbps 13 KB 1 continuity errors
...so probably not the bug in Tvheadend.
Thnaks
Updated by Nichita Dumitrescu over 4 years ago
Updated by I solved this problem by checking "Force old status" in adapter settings.
I'm using Debian 10 with updated kernel to 5.4.0-0.bpo.4-amd64.
tvheadend: version 4.3-1857~g221c29b40.
tuner: Astrometa with Sony CXD2837ER
I hope this helps.