On Tue, 20 Dec 2005, sean wrote:
>
> I got 12/19 cvs. Built that with gcc-4.1.
>
> 1. Region2D.hh needs an #include <cassert>
Hmmm, 4.0.1 didn't need that - easy enough to add though, it's in
CVS now.
> Then I re-dvgrab'ed the tape --format raw.
Ok.
> When I ran it I got a segfault for mpeg2enc.
> smil2yuv -i 2 moontrap-raw/dv/moontrap-001.dv |
> yuvdenoise | \
> y4mscaler -O preset=dvd | \
> mpeg2enc -D 10 -f 8 -q 5 -E -10 -4 1 -2 1 -o moontrap.m2v
> and here's the output:
Looked good until something became upset. One thing to try would
be to "unlimit coredump" and then "gdb mpeg2enc core" to see where
it died.
NOT that it makes any difference - but for chroma conversion only
(with no resizing) you could use "-O chromass=420mpeg2".
> INFO: [y4mscaler] Frame number 2
> test.raw: line 6: 31236 Broken pipe smil2yuv -i
> 2 moontrap-raw/dv/moontrap-001.dv
> 31237 | yuvdenoise
> 31238 | y4mscaler -O preset=dvd
> 31240 Segmentation fault | mpeg2enc -D 10 -f 8 -q
> 5 -E -10 -4 1 -2 1 -o moontrap.m2v
Well, I tried the identical commands (changing only the filenames ;))
and nothing segfaulted.
Next thing to try is isolate the problem one step at a time. First
is checking the YUV4MPEG2 header at each stage.
smil2yuv -i 2 moontrap-raw/dv/moontrap-001.dv | head -n 1
should produce
YUV4MPEG2 W720 H480 F30000:1001 Ib A10:11 C411
Then add the next command:
smil2yuv -i 2 ... | yuvdenoise | head -n 1
should produce the same output
Add in the next command
smil2yuv -i 2 ... | yuvdenoise | y4mscaler -O preset=DVD | head -n 1
YUV4MPEG2 W720 H480 F30000:1001 Ib A10:11 C420mpeg2
Note that the chroma has been resampled and the tag changed.
Finally try playing the file with yuvplay:
smil2yuv -i 2 ... | yuvdenoise | y4mscaler -O preset=DVD | yuvplay
If that works but mpeg2enc faults then it would seem to be a bug
being triggered somehow in the encoder. A gdb backtrace will be
needed - allow the core file to be created and then after getting into
gdb (gdb mpeg2enc core) type "bt" or "where".
Cheers,
Steven Schultz
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