In order to render hd footage i'm using (right now) this ffmpeg pipeline:
ffmpeg -i ? -y -vcodec mpeg2video -b 10M -vtag hdv5 -r 25 -g 1 -aspect 16:9
good luck
Vale
On 02/07/11, ICHTHYOSTEGA p...@ichthyostega.de wrote:E M J Vaessen
schrieb:
Hello, anyone out there?
:-D
trying popen(mpeg2enc --multi-thread 8 --verbose 0 --aspect 3
--format 3
--frame-rate 3 --video-bitrate 28000 --nonvideo-bitrate 384
--interlace-mode
0 --force-b-b-p --video-buffer 448 --video-norm p --keep-hf
--no-constraints
--sequence-header-every-gop --min-gop-size 6 --max-gop-size 6 -o
/data2//Madeira/test1.m2v)
The rendering aborts directly giving this errors:
++ WARN: [mpeg2enc] Progressive encoding selected with interlaced
input!
++ WARN: [mpeg2enc] (This will damage the chroma channels.)
**ERROR: [mpeg2enc] Rate control can't cope with a video buffer
smaller
4 frame intervals
Hi Ed,
first off, I don't have any clue what's going on here, but just
systematic
considertation gets us some steps ahead
You're using mpeg2enc, which belongs to the 'mjpegtools'. Thus, there
is
no direct connection to Cinelerra, other than that you're feeding the
output of a cinelerra render into the input of mpeg2enc.
Thus, if it worked previously (and you really used identical
parameters, even
the same image size), then it must be a change to mpeg2enc.
Next thing is the error message 'Rate control can't cope with a video
buffer
smaller 4 frame intervals'. Google turns up the following message
http://www.mail-archive.com/mjpeg-users@lists.sourceforge.net/msg07414.html[1]
Note: I don't know what's going on, but I'm just doing qualified
guessing.
This message as well as the warnings in your output point into some
problems
with Interlaced/Progressive material. Like as if the input stream to
the
encoder is marked as being 'interlaced', while you choose an encoding
parameter for progressive material. Of course, the first question is
what you *want* to do, and what your source material *actually* is
like, i.e. is it interlaced or progressive, and do you want
interlaced
or progressive video as a final result? (Note Cinelerra has almost
no real support for interlaced material, it just passes things
through)
Quoting from the manpage of mpeg2enc:
-I|--interlace-mode 0|1|2
Set the sequence picture structure and block encoding type for
MPEG-2
streams. By default, this value is inferred from the interlacing
tag of the
input stream. Setting 0 encodes frame-by-frame with support for
interlaced
video turned off, and specifies that progressive chroma
subsampling has
been used. Setting 1 encodes frame-by-frame with interlace-adapted
motion
compensation and block encoding, and specifies that interlaced
chroma
subsampling has been used. Setting 2 encodes interlaced material
field-by-field, which will produce more accurate results for highly
textured
interlaced material with lots of motion, at the expense of
generally less
efficiency.
This setting should match the interlaced-ness of the input stream,
otherwise
chroma artifacts may be generated when the MPEG stream is played
back.
Maybe this gives any additional clues?
Cheers
Hermann Vosseler
Hello Hermann,
I tried a variety of settings: top fields first, progressive and
bottom fields first, while using parameters 0, 1 and 2 for
--interlace-mode with each of them.
All made the rendering stop, though in two cases (progressive en
topfieldfirst in combination with --interlace-mode 2) there was no
error like:
**ERROR: [mpeg2enc] Rate control can't cope with a video buffer
smaller 4 frame intervals
Which makes it all the more mysterious.
Regards,
Ed
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