MJPEG vs MPEG-1 or MPEG-2
Joe Lastoria
I just read last night that MJPEG (as used in the Rainbow Runner) takes up
about 5 times the space that MPEG takes up. Does anyone know if that is
true? Basically they said that 1 hour of 320x240 res in MPEG would take up
1 CD while the same res in MJPEG would take up 5 CDs.
I have also heard that MJPEG is "easier" or "better" to work with when doing
video editing.
My second question is just to verify that although the Rainbow Runner
initially gives us MJPEG, it can easily be converted to MPEG, right? Does
anyone know which encoder is the best one to use?
Thanks in advance,
Joe
Michel R. Carleer
by MPEG1. The difference between the two is that MPEG (1 or 2) does
inter-picture compression in addition to the MJPEG intra-picture
compression.
MPEG1, MPEG2 and MJPEG are lossy compression methods. Which means that each
decompression-recompression cycle results in some picture quality loss.
Strictly speaking, none of them is suitable for high quality editing. The
compression method which will degrade the least the original picture will be
the one which compresses the least and that is MJPEG.
I am usually recording in MJPEG with the RR-G and then use the Xing MPEG
encoder to get a final MPEG1 video stream. The Xing encoder usually does a
pretty good job but I didn't try any other compressor. I don't have any
MPEG2 compressor.
Michel
Joe Lastoria <last...@canada.com> wrote in message
news:1mzv3.134834$U42.2...@news1.rdc1.bc.home.com...
koffie
Just a stupid question...
I've got the Marvel G200 with RR and the Xing 2.20
Do you mean you capture to AVI with the MJPEG and then run with the Xing?
Just tested that today with the profile 'same as original'ore some like
that, but after finishing it was lousy.
The picture was sharp and the sound also perfect, but the 'refresh' between
shots was lousy, al horizontal lines.
I captured with all the settings to 'the best result
Çan you give me some tips?
Also... when i capture with the Avid software, do I run into the 2 gb
problems?
Thanx for helping.
Richard Oostindie
The Netherlands.
Michel R. Carleer heeft geschreven in bericht
<7pmkft$iaj$1...@news1.skynet.be>...
Peter
is done by hardware in real-time i.e. fast. You can then use a software
encoder to convert to MPEG. XingTech's MPEG encoder is also the only one
I've tried but I've heard that Panasonic's encoder gives better quality at
the cost of speed. Another choice is LSX encoder from Ligos.
Also, you might find the discussion 'M-JPEG v. MPEG-2' in
rec.video.production interesting (or search for it at dejanews). Another
good NG for hobby videoediting is rec.video.desktop.
Peter
Michel R. Carleer wrote in message <7pmkft$iaj$1...@news1.skynet.be>...
Michel R. Carleer
recording MJPEG avi's, edit them with Premiere or U-Lead and then crunch
them with Xing (using MPEG1 PAL profile). I don't notice problems during
transitions, but I am recording at VCD resolution (352x288, 25 fps), not
full res. Does this make a difference? I aso tried the LSX Mpeg encoder but
this one gave me transition problems, and it was slower too. Before the
RR-G, I was using a Miro DC30, no probs there either. I didn't really played
with the Xing settings as it worked for me since day one. Sorry I have no
tips, other than to record with a resolution and frame rate identical to the
one which will be the target of the MPEG encoding.
Michel
koffie <kof...@dds.nl> wrote in message news:7pn09g$2foi$1...@beast.euro.net...
> Hi,
>
> Just a stupid question...
>
> I've got the Marvel G200 with RR and the Xing 2.20
>
> Do you mean you capture to AVI with the MJPEG and then run with the Xing?
> Just tested that today with the profile 'same as original'ore some like
> that, but after finishing it was lousy.
> The picture was sharp and the sound also perfect, but the 'refresh'
between
> shots was lousy, al horizontal lines.
> I captured with all the settings to 'the best result
>
> Çan you give me some tips?
>
> Also... when i capture with the Avid software, do I run into the 2 gb
> problems?
>
> Thanx for helping.
>
> Richard Oostindie
> The Netherlands.
>
> Michel R. Carleer heeft geschreven in bericht
Joe Lastoria
realtime MJPEG compression? It would seem that with realtime MPEG
compression you are saving yourself a lot of hours of encoding.
Joe
Peter <nospam...@e-postboks.dk> wrote in message
news:NbEv3.1295$ei2....@news010.image.dk...
> During capture and editing the Rainbow Runner uses MJPEG compression which
> is done by hardware in real-time i.e. fast. You can then use a software
> encoder to convert to MPEG. XingTech's MPEG encoder is also the only one
> I've tried but I've heard that Panasonic's encoder gives better quality at
> the cost of speed. Another choice is LSX encoder from Ligos.
>
> Also, you might find the discussion 'M-JPEG v. MPEG-2' in
> rec.video.production interesting (or search for it at dejanews). Another
> good NG for hobby videoediting is rec.video.desktop.
>
> Peter
>
> Michel R. Carleer wrote in message <7pmkft$iaj$1...@news1.skynet.be>...
koffie
ThX for answering.
What softwrae do you use to capture and what settings do you save you AVI's.
Also (again)
When I start recording whith MJPEG and the file will be bigger ythan 2 Gb do
i run into problems?
Has anyone tested the apps that capture in realtime MPEG (software, no
hardware) whith a capture card like this?
ThX for helping,
Richard Oostindie
The Netherlands
Michel R. Carleer
with the RR-G. If your file becomes bigger than 2 GB, then you will loose a
small part of the recording, the time for the program to close the previous
file and to open the new one. I don't know how much you loose, I never went
that far.
Yes I have tested WinVCR (MPEG1 grabbing and encoding software), and it
works very nicely indeed, but NOT with the RR-G, because WinVCR needs to
receive the pictures in a color format called YUV12, and the RR-G doesn't do
this. What a shame! Used WinVCR with the MiroVideo PCTV and it works
flawlessly. But you need a real fast PC. Grabbing is done at 352x288 (which
is the standard res for MPEG1)
Michel
koffie <kof...@dds.nl> wrote in message news:7ppg3s$356$1...@beast.euro.net...