Herman Robak wrote:
sorry for asking, but how good is the support for AVCHD video editing in
cinelerra just now?
Pretty absent. The handling of h.264 is buggy, to put it nicely.
Bummer... I thought and hoped it's becaus of my setup here...
lt-cinelerra: h264.c:4016: decode_ref_pic_marking: Assertion
`h->long_ref_count + h->short_ref_count <= h->sps.ref_frame_count' failed.
Aborted
How can I prevent this? I don't wanna convert the whole HD footage to
thousands of png-frames to be able to edit it.
Nor would I. Decoding PNGs is too slow for HD, and your hard disk
can hardly move that much data in real time. Even a HD JPEG sequence
is pretty heavy, unless you have awesome hardware.
I dumped it with mplayer in yuv4mpeg or something, but it came to about
2.9gig for about
40 seconds footage. That's not very handy and I don't wanna think about
editign an hour or more...
Are there any patches or a way I can 'simply' remultiplex the
av file before feeding it into cinelerra to prevent it?
I doubt this is just a muxing problem. My suggested workaround
would be recoding into MPEG2 at the same resolution, which Cinelerra
supports quite well. You still need a hefty computer, though.
Do you have an Idea how I could convert it without any *viewable*
quality loss to mpeg2? It should be much smaller than
1gig per 10 secs though...
BTW: Somewhere I read about a faulti codec in most of the avchd
camcorders which leads into wrong filesizes which, for example,
makes mplayer and cinelerra crash because they come kind of 'out of sync'.
The outputted console errors aim to the same direction I think and since
the manufacuterers commonly ignore their faults it's the software whicht
has to become more fault-tolerant;-)
When HDV arrived a few years ago, Cinelerra happened to support it.
Not quite so with AVCHD. AVCHD is even less ideal for editing than
long-GOP HDV (1080i HDV), so Cinelerra should have some user friendly
proxy editing support.
The Problem is, nearly every new HD cam on the marked records in AVCHD
or a similar way (MP4 + some sort of compressed audio) so I
think it's mandatory for cinelerra to support it in a convinient way,
without converting before editing.
Cheers,
Uli
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