transcode freezes at 99%

[Radu Cristescu]

Binary package hint: transcode

I installed dvd::rip today, which uses transcode to create the AVI files. I'm using 2-pass encoding, and quite a lot of the time transcode freezes at 99% on the first pass.

gdb shows three threads when transcode is in this state: two threads are in conditional waits, and the third one is in a "pause()" call.

Looking around the web, I found this:

http://www.transcoding.org/transcode?Transcode_FAQ

<blockquote>
If your problem is that transcode "hangs" immediately, or even after some time, you may be experiencing the venerable old thread-version problem.

If running transcode this way: "env LD_ASSUME_KERNEL=2.4.0 transcode ..." fixes the problem, then it's thread version issues, not transcode, that's at fault.

See: http://people.redhat.com/drepper/assumekernel.html
</blockquote>

The suggested solution doesn't work on my installation. I also don't see the link between NPTL and the hang. I haven't looked in the source code yet.

Description: Ubuntu 9.10
Release: 9.10
Package: transcode
Version: 3:1.1.4-0.0ubuntu4
Architecture: i386

[Radu Cristescu (radu.c)]

Thread 2 (Thread 0xa479eb70 (LWP 17259)):
#0 0x00c46422 in __kernel_vsyscall ()
#1 0x003a8e15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2 0x08060a8c in aframe_reserve ()
#3 0x0805f9b7 in ?? ()
#4 0x003a480e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#5 0x004bb8de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb77c2ae0 (LWP 17252)):
#0 0x00c46422 in __kernel_vsyscall ()
#1 0x003a8e15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2 0x08060d0c in aframe_retrieve ()
#3 0x0805e5b4 in ?? ()
#4 0x0805d5cb in tc_encoder_loop ()
#5 0x080540ca in main ()

the third thread is just in tc_socket_wait

[Radu Cristescu (radu.c)]

Stack trace with unstripped symbols and -O0

Thread 3 (Thread 0xa5768b70 (LWP 15603)):
#0 0x00e94422 in __kernel_vsyscall ()
#1 0x00e55611 in pause () from /lib/tls/i686/cmov/libpthread.so.0
#2 0x0807089b in tc_socket_wait () at socket.c:842
#3 0x0804fcee in event_thread (blocked_=0xbf7fe490) at transcode.c:276
#4 0x00e4d80e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#5 0x0032a8de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 2 (Thread 0xa4766b70 (LWP 15605)):
#0 0x00e94422 in __kernel_vsyscall ()
#1 0x00e51e15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2 0x08068077 in aframe_reserve () at framebuffer.c:1048
#3 0x08066514 in process_audio_frame (_vob=0x882a008) at frame_threads.c:235
#4 0x00e4d80e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#5 0x0032a8de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb778aae0 (LWP 15598)):
#0 0x00e94422 in __kernel_vsyscall ()
#1 0x00e51e15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2 0x08067cd0 in aframe_retrieve () at framebuffer.c:889
#3 0x08064f16 in encoder_acquire_aframe (buf=0x80c5574, vob=0x882a008) at encoder-buffer.c:274
#4 0x080644df in tc_encoder_loop (vob=0x882a008, frame_first=0, frame_last=2147483647) at encoder.c:1374
#5 0x08050161 in transcode_mode_default (vob=0x882a008) at transcode.c:466
#6 0x08057464 in main (argc=32, argv=0xbf7fe704) at transcode.c:2740

[Radu Cristescu (radu.c)]

From the log:

[framebuffer.c] (V|retrieve) requesting a new video frame
[framebuffer.c] got a new video frame reference: 0x9790f18
[encoder-buffer.c] got frame 0x9790f18 (id=1251)
[framebuffer.c] (A|retrieve) requesting a new audio frame
[framebuffer.c] (A|retrieve) audio frame not ready, waiting
[framebuffer.c] retrieve: null=10 empty=0 wait=0 locked=0 ready=0
[transcode] (sighandler) SIGTERM received
[framebuffer.c] (A|reserve) audio wait just ended
[frame_threads.c] audio interrupted: exiting!
[frame_threads.c] audio stream end: got, so exiting!
[framebuffer.c] (A|retrieve) audio wait just ended
[encoder.c] warning: failed to acquire next raw audio frame
[encoder.c] export terminated - buffer(s) empty
[transcode] flushing 1358 audio bytes
[encoder.c] encoder closed
[decoder.c] cancelling the import threads
[decoder.c] video thread exit (ret_code=0) (status_code=0)
[decoder.c] audio thread exit (ret_code=0) (status_code=-1)

[Radu Cristescu (radu.c)]

That SIGTERM is mine. I sent it.

[Alessio Treglia (quadrispro)]

Hi,

thanks for the report.

Could you try to reproduce this with the latest upstream release available in Quantal?

[Launchpad Janitor (janitor)]

[Expired for transcode (Ubuntu) because there has been no activity for 60 days.]