[MEncoder-users] Mencoder hanging while trying to encode some files

[Alex Bennee]

Hi,

I'm having a problem with mencoder hanging while trying to encode some
VOB files. The versions I'm using are:

media-libs/x264-0.0.20091021
media-video/mplayer-1.0_rc4_p20091026-r1

The encode line I'm using is:

-x264encopts subq=6:bframes=3:partitions=p8x8,b8x8,i4x4:weight_b:threads=auto:nopsnr:nossim:frameref=3:mixed_refs:level_idc=41:direct_pred=auto:trellis=1

To create PS3 compatible mp4s.

Running on Gentoo (but no overly tweaked optimisation flags ;-). Other
files work fine. It seems to be near the end of the encode it hangs:

Pos:   1.5s     45f ( 0%) 11.67fps Trem:   0min   0mb  A-V:0.080 [8:147]]
Skipping frame!
Pos:2494.6s  62372f (100%) 21.91fps Trem:   0min 634mb  A-V:0.080 [2000:128]
Skipping frame!
x264 [error]: Incomplete MB-tree stats file.0min 634mb  A-V:0.048 [2000:128]
x264_encoder_encode failed
x264 [error]: Incomplete MB-tree stats file.0min 634mb  A-V:0.052 [2000:128]
x264_encoder_encode failed
x264 [error]: Incomplete MB-tree stats file.0min 634mb  A-V:0.016 [2000:128]
x264_encoder_encode failed

1 duplicate frame(s)!
Pos:2494.6s  62377f (100%) 21.91fps Trem:   0min 634mb  A-V:0.020 [2000:128]
Flushing video frames.

Attaching via GDB I can see all the threads are waiting for something:

(gdb) bt
#0  0x00007fead4c94765 in pthread_join () from /lib/libpthread.so.0
#1  0x00007fead0e84ca0 in x264_encoder_frame_end (h=0x1af5060,
thread_current=0x1cdcb90, pp_nal=0x7fff626a8f00,
pi_nal=0x7fff626a8f0c, pic_out=0x7fff626a8eb0) at
encoder/encoder.c:1965
#2  0x0000000000455356 in encode_frame (vf=<value optimized out>,
pic_in=0xfffffffffffffe00) at libmpcodecs/ve_x264.c:254
#3  0x00000000004554d2 in control (vf=0x1a0c910, request=<value
optimized out>, data=<value optimized out>) at
libmpcodecs/ve_x264.c:202
#4  0x0000000000445252 in main (argc=<value optimized out>,
argv=<value optimized out>) at mencoder.c:1503
(gdb) frame 0
#0  0x00007fead4c94765 in pthread_join () from /lib/libpthread.so.0
Current language:  auto
The current source language is "auto; currently asm".
(gdb)

(gdb) info threads
  4 Thread 0x7feacba93950 (LWP 6524)  0x00007fead4c97dc9 in
pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
  3 Thread 0x7feacca95950 (LWP 6525)  0x00007fead4c97dc9 in
pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
  2 Thread 0x7feacc294950 (LWP 6526)  0x00007fead4c97dc9 in
pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
* 1 Thread 0x7fead6041750 (LWP 8646)  0x00007fead4c94765 in
pthread_join () from /lib/libpthread.so.0

Any ideas for things I can try?

-- 
Alex, homepage: http://www.bennee.com/~alex/
http://www.half-llama.co.uk