hello,
i build mjpegtools from (yesterdays) cvs, and i run into the following
problem:
lavplay file.avi
only output a plain green screen. but
lav2yuv file.avi | yuvplay
does work correctly (after a fraction of a second of green screen at
the start)
any idea what might be wrong?
the avi file
ah, and i should add that glav has the same problem (understandable i
guess). which is a tool that i would very much like to play with, it
looks very useful.
> i build mjpegtools from (yesterdays) cvs, and i run into the following
> problem:
>
> lavplay file.avi
>
> only output a plain green scre
> This problem sounds very familiar.Does a search of the mailing
> list archive mention if the problem was successfully resolved the
> last time someone asked about the "screen of green"?
uhm.. is it me or does searching not work on the sourceforge archive
pages? are the ma
> Does adding "-p s" to the lavplay command help?
no..
however, i can play it with converting it with lav2yuv and back
with yuv2lav (loosing sound on the way...)
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> lavplay doesn't support DV.
I see.. That's really a shame, and especially that glav doesn't
work..
But, as lav2yuv | yuvplay does work... Would it be very difficult
to add DV support to lavplay?
Maarten
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> That's what *I* thought, too. (Which is why I've ignored it for 2+ years.)
>
> Somehow, the latest/current lavplay (and thus glav) works on my machine,
> at least on the one NTSC "dv2" format AVI I use for testing stuff (only
> one I tried).
interesting... how did you get this dv2 avi? with
Hello,
I created a DVD from some miniDV recordings, and I tested it on 3
hardware players. 2 work perfectly, but the third one, a SAMSUNG M105,
only shows the menu I created, but refuses to play any titles. (can't
give the details of the refusal - it's not my player)
I've seen on http://www.dvdr
Hello Richard,
Thanks for your reply.
> You did not say which version of mpeg2enc you are running. Is it the
Yes, sorry, I am not in front of my home machine, where I did all the
encoding... I use a fairly recent (about one or two weeks) CVS checkout.
> latest, where the default for -R switche
Hello Steven,
If I understand you correctly, you are saying that using B frames will
result in less player compatibility? And Richard suggests dual prima
motion estimation is causing less player compatibility. So I guess it is
best (compatibility wise) to both turn off B frames and turn of DPME (-
Florin Andrei <[EMAIL PROTECTED]> wrote:
> http://zebra.fh-weingarten.de/~transcode/docs/DV-to-DVD-HOWTO.txt
>
> It describes a method slightly different than yours, but it has some
> comments on what are the do's and don'ts of DVD player compatibility.
Thanks, that is a very useful Howto, I wis
> Since you found a hardware player that seems allergic to -R 0
> streams, why not test it for us. Make a -R 0 stream without DPME,
> and make a -R 1 or -R 2 stream (which will automatically force DPME
> off) and test it on the player. Let us know which one works and
> which one does not.
That i
Hello,
> Summary: Either use "-R 2" or "--no-dualprime-mpeg2 -R 0".
I did -R 2 , and now I have a DVD that works on all 4 players that I've
tried. Thank you all for your help! I noticed it before, and now once
again: the mjpeg community is very supportive. Thanks to that support,
I've bee
hello,
i created a dvd with 8 mpegs (converted from miniDV), and all work
perfectly except for 1, which starts correctly, but after a few seconds
stops and starts again from the beginning, in a loop.
now, the encoding parameters have been identical for all mpegs. the only
difference is that in th
Hello,
I wrote about this problem some days ago, but after several tries (and
ditto useless burned dvd's...), I still have the same problem. So I'll
post a more detailed description of the process. I'd be very happy if
you could give it a look, and see if the error is obvious. In any case,
the inf
I just tried the same with the png->mpeg generated file in a seperate
title, and the same problem occurs: it does not end, and the time
display does not increate
so it seems i am doing something wrong creating the mpeg video from a png
file, or for some other reason the resulting mpeg file i
Hello,
I have been recording from a video4linux device, a Bt878 based card (no
hardware encoding) and I first tried with lavrec, but I experienced too
many lost frames.
After some more tries (I did not manage to record with audio with
mencoder and with ffmpeg), I ended up using nuppelrec (from nv
Hello,
I want to adjust the brightness/contrast/colour in yuv frame stream, but
I can't find the tool to do it. I get the impression yuvcorrect should
be capable of doing it, but it's interface seems rather low-level, and
it lacks a man page (doesn't it?)... Maybe there is a easy way to
convert hi
> A nVidia FX5200 is __cheap__ and comes with a MPEG_2 decoder than
> MPlayer and ffmpeg know how to tap into. Quite useful for playback
> even when the system is under heavy load (since the decoding is
> shoved out to the graphics card).
Hey, that's really interesting, thanks. I have an nVidia F
> the following is (of course) sending me back an error
>
> find . -name \*.ppm | ppmtoy4m | blabla
How about
find . -name \*.ppm -exec ppmtoy4m {} \; | blabla
or maybe
find . -name \*.ppm | while read filename; do ppmtoy4m $filename; done | blabla
?
maarten
Hello,
I am trying to convert DV to SVCD, as suggested in
http://eclipsedvd.christophefantoni.com/index.php?mode=tuto&tuto=nuxsvcd
and
http://www.satlug.org/~bigjnsa/vcd-linux.htm
but already the first step,
lav2yuv foo.avi
(where foo.avi has been obtained with dvgrab --format dv2)
seems to
First of all, sorry for the crossposting, but it seems to involve
everything.
I am trying to convert mini DV (PAL) to SVCD, but so far no luck..
Feeding dvgrab --format dv2 to lav2yuv gives a distorted image;
totally green, with blocks. If I understand this correctly, this is
because dvgrab gene
> Hmmm, I thought that dvgrab created files with either 4:1:1
> (NTSC) or 4:2:0 (PAL).PAL DV is 422? I didn't know that
> was the case. Today wasn't a total loss - I learned something ;)
Well, at least that what it said on the page I mentioned - that libdv
exports both NT
> > Feeding dvgrab --format dv2 to lav2yuv gives a distorted image;
>
> I can vouch that ss per the next post I used format raw in dvgrab with no
> problems like this. I also use Kino with ieee1394 and the raw driver.
Is that also PAL or NTSC?
I did try with raw output, but it did not work well
> OK - don't use --with-pal-yuv=YV12 - just configure as normal. Recompile
> libdv, dvgrab and smilutils. Then try:
Okay, I will try both yours and Steven's suggestions. It seems it comes down
to use yv12 everywhere or nowhere.
> dvgrab --format raw - | raw2yuv | yuvplay
Okay, raw it will be. I
> Are you going to do this with lav2divx? I got nothing but segfaults. The
> warnings about smoke etc are a bit scary.
So far I did it with mencoder, which gave me good results, but I will try
lav2divx (once I got SVCD's working), to compare.
> BTW can you tell me whether the DiVX files you made
> dvgrab --format raw - | raw2yuv | yuvplay
okay, this works fine! (which indicates that lav2yuv is incompatible
with dvgrab output in dv1/dv2 mode... as I understand (correct me
if I'm wrong) because dvgrab, through libdv, outputs YUV422 and lav2
expects YUV420. will this be fixed?)
Now, if I
> I just checked Sony's "DVCAM Format Overview" document and
> PAL DV is indeed 4:2:0
But is dvgrab (libdv) output indeed that format?
(see my other mail for more info... dvgrab --format raw indeed seems
to work!)
Maarten
---
T
> These are generally harmless and don't affect video quality. They should
> probably be renamed to meaningful warnings. Will do with my next putback.
Hmm, but it ends with
Error while decoding stream #0.0
Error while decoding stream #0.0
Error while decoding stream #0.0
Error while decoding
Hi Steven,
Thanks a lot, going through all the trouble of checking these things!
If I understand correctly what you are saying, configuring libdv with
--with-pal-yuv=YV12 is all I need to do to get dvgrab's dv2 output to
work with lav2yuv? That is actually what I tried (see my mail that
started t
Steven M. Schultz wrote:
> That's perfectly correct. The maximum video bitrate for
> SVCD is 2500 kbits/sec (some players will accept much higher
> rates but for compatibility 2500 is the value to use) - and
> mpeg2enc sets that as the rate to use with -f 4.
Okay, I thoug
Hi,
If I did not get mistaken while recompiling, I can confirm that
compiling both libdv and mjpegtools with default options, works
correctly.
dvgrab --frames 100 --format dv2 dv2
lav2yuv dv2001.avi | yuvplay
(the thing is that I remember that this did not work correctly
when I first tried... M
> Ah, but what happens (or did you already try this combination and
> we've forgotten the results ;)) with
>
> mjpegtools
> --
> ./configure --with-dv-yv12
>
> libdv
> -
> ./configure
I'm sure I accidently tried this combination at some p
Hi,
As you suggested, I tried with libdv configured by default, and mjpegtools
with yv12. The result of lav2yuv | yuvplay is a distorted green image.
Seems that default configure for both is the way to go.
smil2yuv segfaults with both configurations though... If you want I can
send a gdb trace.
hello,
i am trying to capture from a v4l device (bt878 based card), but
the -i option seems to fail: if i set it to -i p, for
PAL through Composite, it actually records the TV-tuner, and indeed
v4lctl list confirms this. if i use v4lctl to set it to composite
by hand (v4lctl setinput Composite1),
> You find here that:
> p - PAL through Composite or 1st Bt8x8 input
> P - PAL through SVHS- or 2nd Bt8x8 input
> t - PAL through TV-tuner- or 3rd Bt8x8 input
Yes, I read that, and misunderstood it. I thought it ment that
Composite==1st Btx8 input, and that -p selected it.
Thanks,
Maarten
Hello,
I have been tranfering some DV recording to VCD and SVCD, and I am
a bit surprised by the result. I first created the VCD, with a non-
standard bitrate of 2500, and I was surprised how good it looked
(played with a DVD player on a TV). Then I created the SVCD (standard
settings). expecting
Hello,
Thanks, Steffen, Bernhard and Steven, for your replies. I will try your
suggestions to improve my SVCD recording. I am wondering though, whether
it would be better to stick with (non-standard bitrate) VCD, because
with the same amount of data the quality is better (since a normal
televisio
Hello,
Trying to get the optimal and compatible settings for creating VCD's and
SVCD's, got me thinking that it would be really nice to have a test VCD
and a test SVCD containing a reference recording (of let's say 20
seconds) with mpg's created with various settings. VBR vs CBR, several
bitrates,
> Have you already tried the VCD/SVCD examples on www.vcdhelp.com ?
no, but there seem to be only a very few samples, that follow the standard
to the letter, and i wanted to create several samples increasing in
bitrate and with different settings, so you can easily test what a
specific standalone
use alsactl store and alsactl restore.
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> I think for SVCD if the -K kvcd option and -q 8 (or 9) were used
> the results would make a good SVCD video. If the source has
> noise then adding yuvdenoise with moderate settings (-l 1 or -l 2)
> will work wonders.
Hi,
I am still trying different settings (but the pr
> I think for SVCD if the -K kvcd option and -q 8 (or 9) were used
Do I understand that using -q will result in a variable bitrate, and thus
in smaller standalone player compatibility?
Maarten
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> Usually a good idea to add "-N value" with "-K kvcd" anyhow since the
> quantization matrices for kvcd already contain modifications to
> the high frequency quantizers.
Is this really what you want to say? It contradicts a previous mail of
yours where you suggest _not_ to combi
> no flow control - what happens if the encoding can't, even momentarily,
> keep up (disc accesses, other programs running, whatever)
This is something I would like to comment on. Being an audio software
developer, these are issues that I am rather familiar with. I guess that
with audio, for examp
[ using ffmpeg for SVCD encoding ]
> By all means try it (and I will do the same also). Overall
> though I am not concerned about the encoding time - queue the
> runs in the morning before I go to work and they're done by
> the time I return home.
It turns out that ffmpe
Hello,
I tried with the suggested settings (I don't have them at hand, but they
included passing through yuvdenoise -l 1, and adding -q 8 -K kvcd to
mpeg2enc's command line), and I still find that VCD at 2500vbr looks
better. Especially when there is a fast camera movement, things get
really messy
> A bit off topic, but could be useful. I have this old VHS tape with REALLY
> bad sound on it. I gain boost with a bit of gain and lowpassfiltering but
> still there is a kind of fluctuation I cannot get rid of.
> Anybody with an advice ?
That really depends on several things. What kind of fluc
> > A bit off topic, but could be useful. I have this old VHS tape with REALLY
> > bad sound on it. I gain boost with a bit of gain and lowpassfiltering but
> > still there is a kind of fluctuation I cannot get rid of.
> > Anybody with an advice ?
>
> That really depends on several things. What
hello michael,
interesting post.
> according to the DVD standard. My hardware player was kind enough to play the
> resulting mpeg2 stream burned as an SVCD. This is the picture quality I want
> to have!
could you share your settings with us?
thanks.
maarten
---
Hello,
I want to record a powerpoint presentation to VCD. I will use OpenOffice
to play the presentation. But how do I record the video output to
harddisk? Has anybody done this, or something similar, before? I'd prefer
a software solution.
Maarten
I answer myself: xvidcap
> I want to record a powerpoint presentation to VCD. I will use OpenOffice
> to play the presentation. But how do I record the video output to
> harddisk? Has anybody done this, or something similar, before? I'd prefer
> a software solution.
---
> > I want to record a powerpoint presentation to VCD. I will use OpenOffice
> > to play the presentation. But how do I record the video output to
> > harddisk? Has anybody done this, or something similar, before? I'd prefer
> > a software solution.
> A general answer would be to create jpegs ima
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