Mythfrontend segfault w/dvb radio PID type(private-sec 0x5), MHEG?

[Mark.Buechler@…]

I'm running 9488 and am seeing a segfault on the frontend whenever I tune to a DVB radio channel. I'm not in the UK so I don't know if there are any MHEG streams but it looks like the backend is recording a new stream which may be MHEG related?

From the backend:

2006-03-24 16:10:12.234 DVBRec(0): SetOutputPMT() Program Map Table ver(1) pid(0x21) pnum(1) len(34)

Stream #0 pid(0x100e) type(audio-mp2-layer[1,2,3] 0x4)

ISO-639 Language: code(eng) canonical(eng) eng(English)

Stream #1 pid(0x1a0e) type(private-sec 0x5) Stream #2 pid(0x21) type(video-mpeg2 0x2)

From the frontend:

Program received signal SIGSEGV, Segmentation fault. [Switching to Thread -1493509200 (LWP 14039)] 0xb5ff0ef1 in memmove () from /lib/tls/i686/cmov/libc.so.6

Thread 7 (Thread -1493509200 (LWP 14039)): #0 0xb5ff0ef1 in memmove () from /lib/tls/i686/cmov/libc.so.6 No symbol table info available. #1 0xb75de1d4 in write_section_data (s=0x91363f0, tss1=0x8410680, buf=0xa6f9c635 "\002°\"", buf_size=183, is_start=$

left = 146 tss = (MpegTSSectionFilter *) 0x841068c len = 37

#2 0xb75e0d8f in handle_packet (ts=0x9150e80, packet=0xa6f9c630 "G@!\021", position=188) at mpegts.c:1758

s = (AVFormatContext *) 0x91363f0 tss = (MpegTSFilter *) 0x8410680 len = 0 pid = 33 cc = 1 cc_ok = 1 afc = 1 is_start = 64 p = (const uint8_t *) 0xa6f9c635 "\002°\"" p_end = (const uint8_t *) 0xa6f9c6ec ""

Mythfrontend log and gdb bt attached.

[Mark.Buechler@…]

mythfrontend -v playback

[Mark.Buechler@…]

gdb output

[danielk]

Mark, can you debug this?

It is something with the last if statement in write_section_data() in mpegts.c, but you will have to examine the values involved. My guess is that a negative length value is being calculated, perhaps due to a PES length assumption (assuming it fits inside on TS packet), or perhaps due to some threading issue.

[danielk]

(In [9754]) Fixes #1578. DVB Radio was using the same pid for a PSIP stream and the dummy video, which confused ffmpeg.

Thanks to Mark Buechler for debugging this problem.

[Mark.Buechler@…]

frontend log.. doesn't really show anything

[Mark.Buechler@…]

Backend log.

[danielk]

It looks like this is not working now because of user error, the recording type in the recording profile needs to be radio or the default, not TV, to record DVB Radio.