Ffmpeg segfault

Channels DVR Server Troubleshooting
#1

My Channels DVR server version 2021.08.12.0054 is running under CentOS 8.4 on a 4 core / AMD A10-4600M APU.

I do not use Channels DVR outside my local network.

Whenever Channels DVR starts I see the following in /var/log/messages
Aug 12 01:28:24 myhost kernel: ffmpeg[31046]: segfault at 0 ip 0000000001976cf9 sp
00007ffdc5eec710 error 4 in ffmpeg[400000+48e7000]
Aug 12 01:28:24 myhost abrt-hook-ccpp[31049]: Process 31046 (ffmpeg) of user 1000 killed by
SIGSEGV - dumping core

The provided dynamically linked ffmpeg-dl finds all the relevant libraries:
2021.08.12.0054/ffmpeg-dl:
linux-vdso.so.1 (0x00007ffdd25fc000)
libm.so.6 => /lib64/libm.so.6 (0x00007f1470ad0000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f14708b0000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f14706a8000)
libc.so.6 => /lib64/libc.so.6 (0x00007f14702e0000)
/lib64/ld-linux-x86-64.so.2 (0x00007f1470e58000)

Currently there are certain streams that will not start from the guide when attempting to view on an iPad.

#2

Is this happening only with hardware transcoding enabled?

#3

Thank you for your prompt response.

Apologies, but I do not see a hardware transcoding switch on the 'Settings' page.

The segfault occurs when channels-dvr starts. From the abrt output, the command-line is

/usr/local/DVR/channels-dvr/2021.08.12.0054/ffmpeg -hide_banner -nostats -loglevel warning -loglevel quiet -init_hw_device vaapi=intel:/dev/dri/renderD128 -f lavfi -t 0.1 -i color=black:640x480 -f null -y /dev/null

It is using the statically linked ffmpeg.

Note: I'm using an AMD apu. Would it be more appropriate to use the arg: vaapi=amd:/dev/dri/renderD128?

I'm a novice in the video field.
Thanks!

#4

Okay I see. If its just during boot then its harmless. Its probing to see what hardware options are available.

1 Like
#5

Thanks!