1. (gdb) bt
2. #0  0x00007faa30ce2c02 in conference_video_muxing_write_thread_run (thread=0x7fa9b826b850, obj=0x7fa9dcffb470) at conference_video.c:1478
3. #1  0x00007faa62900000 in dummy_worker (opaque=0x7fa9b826b850) at threadproc/unix/thread.c:151
4. #2  0x00007faa61d570a4 in start_thread (arg=0x7fa9dc220700) at pthread_create.c:309
5. #3  0x00007faa6143104d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
6. (gdb) bt full
7. #0  0x00007faa30ce2c02 in conference_video_muxing_write_thread_run (thread=0x7fa9b826b850, obj=0x7fa9dcffb470) at conference_video.c:1478
8.         layer = 0x0
9.         canvas = 0x0
10.         member = 0x7fa9dcffb470
11.         pop = 0xfff70007fff70007
12.         frame = 0xfff70007fff70007
13.         loops = 5207
14.         last = 1447347145333163
15.         __PRETTY_FUNCTION__ = "conference_video_muxing_write_thread_run"
16. #1  0x00007faa62900000 in dummy_worker (opaque=0x7fa9b826b850) at threadproc/unix/thread.c:151
17.         thread = 0x7fa9b826b850
18. #2  0x00007faa61d570a4 in start_thread (arg=0x7fa9dc220700) at pthread_create.c:309
19.         __res = <optimized out>
20.         pd = 0x7fa9dc220700
21.         now = <optimized out>
22.         unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140367519418112, 2442730306217816571, 0, 140366915454288, 22, 140367519418112, -2398753912775396869,
23.                 -2399695193186258437}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
24.         not_first_call = <optimized out>
25.         pagesize_m1 = <optimized out>
26.         sp = <optimized out>
27.         freesize = <optimized out>
28.         __PRETTY_FUNCTION__ = "start_thread"
29. #3  0x00007faa6143104d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
30. No locals.
31. (gdb) list
32. 1473
33. 1474                            if ((switch_size_t)pop != 1) {
34. 1475                                    assert(pop);
35. 1476                                    frame = (switch_frame_t *) pop;
36. 1477                                    assert(frame);
37. 1478                                    if (switch_test_flag(frame, SFF_ENCODED)) {
38. 1479                                            switch_core_session_write_encoded_video_frame(member->session, frame, 0, 0);
39. 1480                                    } else {
40. 1481                                            switch_core_session_write_video_frame(member->session, frame, SWITCH_IO_FLAG_NONE, 0);
41. 1482                                    }
42.