BIOS LOGO 修改 EXE 相关软件 最全视频软件 搜新软件 搜新美影 搜新MPEG4专栏
现在位置:搜新网首页---MPEG4 专栏
 
MPEG 编码软件大比拼

2000-9-3

There are a lot of legends on the market about the encoder solutions. The basic problem is the buyers wouldn't purchase too expensive solution and in this case the decision is not so easy. You should buy a safe solution, some expensive turn-key system and we are sure that those can create excellent quality, but because we are supposing that the reader of this article is not the member of Oil Millioners Club, the price of choosed encoders is in the $0-$10K range  So we choosed some of cheap encoders and made some tests of them to make to be cleared the truth. Recently we tested realtime encoders too, although we know that due to the prices the offline encoders are more popular.

If you would like to see here much more encoders let us know the manufacturer's URL!

Intermezzo, about DivX, to say MPEG-4

Our problem with the MPEG-4 is
- Can't be played on normal TV monitor
- Desktop player hasn't been released
- The quality is not acceptable in some cases
What kind of encoders we tested?
- offline, software based
- offline, hardware based
- realtime, hardware based
What is "offline encoding"?
If you have an AVI file (or another kind of picture sequence) stored on your harddisk, and this will be converted into MPEG-2 stream, this procedure called offline encoding. The advantage of this way is that the conversion is fully digital so no any D/A then A/D conversion exists which elliminates the quality loss caused by the output and input circuits, such as PAL coder/decoder, digitizers, etc.. The disadvantage is that sometimes (depending on the encoder) this way is very time consuming.
The real-time encoders
They have a big advantage such as the encoding is not so time consuming like offline encoding. But (as you can see below), some of offline encoders is very fast, and if the new CPUs will be released on the market those will be even faster than the real-time solutions. The hardware encoders have a disadvantage. They have fixed encoding algorythm, while the software doesn't. Yes, the new generation of encoder chips have diownloadable microcode (Panasonic in Amber, C-CUBE in Apollo, RT-2000, DC1000), but those codes contain not the whole encoding program. I believe that the future (realtime) hardware encoders will be just some simple "YUV" based capture board and the encoder engine itself will be a software. This is more flexibile in relation of the update.
The source.
Because we have a lot of experiences about MPEG encoding we know that there are critical things which can cause bad result Very fast, dynamic movings, a vast amount of small particulars, unexpected scene changes.  We choosed a very complicated 23 seconds long clip as source AVI file what meets those demands. The original source was recorded by a DV camcorder which is a typical device nowadays.By the way we discowered an interesting thing, such as depending on the content the different encoders did accomplish the tasks with different results, to be more precise one encoder was able to encode the trees in good quality but the fast movings caused problems, another one created excellent quality at fast movements but crashed at the swimming pool - and so on. Is not optimal choice...
Considerations.
Quality of the result. We didn't store any information of price, reliability and the manageability of user-interface
.
How we made the test?
We prepared a 23 seconds long  AVI file including critical scenes.You can download this file from here:TEST.AVI (80 Mbyte). To playback this file you need a dv codec, thus download one from the Canopus's ftp site.
s01.gif (17053 bytes) s02.gif (20433 bytes) s03.gif (16554 bytes)
Fast dynamic moving A lot of small particulars Trees, edges, small objects

The MPEG encoder parameters were:

Standard PAL
Resolution 720*576
Profile and level MP@ML
Frame rate 25
Bitrate around 5 Mbit avg, VBR if applicable
GOP structure IBBPBBPBBPBB

After the encoding we loaded the result into Bitrate Viewer (please to www.SOUXIN.com download) software which tells everything about the basic informations. Of course  we watched the result on a Sony high-end TV monitor also. We gave grades from 1 to 10 depending on the result quality. This was a subjective rating, but we did our best to still be objective. There is a very important thing of the quantization scale what you can see on the Bitrate Viewer's graph. The higher number means worse quality, but you need to know that sometimes is not worth to compare the numbers if the one encoder uses linear table the other one uses non-linear. This comparison can result mistake, not to mention the alternate or zig-zag quantization tables. In fact, the best way is downloading the mpeg clips. If the encoder has had some filtering feature we switched it off. The used computer is a dual PIII 500 Mhz with NT 4.0 srvpack 5.

The encoders
Product name (in ABC order) Manufacturer's URL
AMBER DV2MPEG converter http://www.canopuscorp.com
APOLLO DVD-er http://www.dv-studio.com/
BBMpeg 1.2 http://members.home.net/beyeler/bbmpeg.html
Cinemacraft Encoder Lite and SP 2.0 http://www.cinemacraft.com
DV 500 http://www.pinnaclesys.com
DVMpeg 5.0 http://www.darvision.com
ExpertDVD http://www.pixeltools.com
LSX Encoder 3.0 http://www.ligos.com
MPEGator 2 http://www.darvision.com
MEGAPeg http://www.digigami.com
MPEG Conversion Studio 1.1 http://w3-mcgav.kddlabs.co.jp/
MPEG Power Professional V2.0h http://www.heuris.com
Realmagic DVR http://www.sigmadesigns.com/
Tsunami Encoder Beta Version http://www.yks.ne.jp/~hori/TMPGEnc.html
Japanese site! You will certainly need this:
http://www.teletranslator.com:8080/
Vitec MPEG2 tools http://www.vitecmm.com
Of course later if we can try-out another encoders, the result will be included here. In case of  you doubt in the test, you may download the clips and watch them by your eyes. As mentioned earlier you can download the original source AVI file also. If you find so the downloading is too time consuming, we have a CD with these clips what you can order on our shopping site.
The results
Click on the encoder's name to look the result created by BV! A comment for DVD targeted users: the bitrate is not allowed to exceed the 9.8 Mbit. Do not forget this point of view! The encoders under 7 points creates too much well visible artifacts, so those are not recommended for hard sources. With very noiseless, detail-poor and clean sources there are no visible differences between the encoders of 7-9 points.
Encoder Time
(MM:SS)

Quality

Mpeg file Comment
Cinemacraft Encoder SP 2.0 01:49 ||||||||| 9 anotherx.mpv Very sharp and almost perfect picture. Too expensive. But for pro user this is the "final solution". That is our dream. Btw. in one pass VBR encoding the time taken was around 0:30, but we found so the three pass encoding results better quality.
Tsunami Encoder Beta Version 06:38 |||||||| 8 tdmpeg.mpv As we said earlier:very promising encoder. This is a freeware software and our opinion is that the encoder manufacturers now have very good reason to vorry on the sales quantities.The tested version is Beta 12, btw. We would like to give 10 points to this encoder  To do this now some small developments needed:
1. A bit better vertical motion estimation
2. Some small quality improvement
3. Faster functioning
Anyway, we badly suggest this encoder as the best choice. We opened an individual page for this encoder.
MPEG Conversion Studio 1.1 04:03 |||||||| 8 mpgcstd.mpv VBR is not implemented. Very expensive product.
ExpertDVD 18:47 |||||||| 8 expdvd.mpv The picture is a little smoothed. The VBR is not a true VBR, but a "Not Constant Bitrate" CBR. Interesting...Terribile slow.
LSX Encoder 3.0 08:32 ||||||| 7 ligos03.mpv The picture is a bit smoothed, and flickers because of the lack of field DTC. This means it is unusable for field rendered AVI and to watch the result on TV monitors. Maybe the Premiere plug-in version implements the field DCT.
MPEG Power Professional V2.0h 04:50 ||||||| 7 heuris.mpv A true middle class encoder.Each part of test clip created in the same quality. Nothing extra...
Cinemacraft Encoder Lite 00:27 ||||||| 7 cctlite.mpv The most fastest encoder, and even very cheap, too. VBR is not supported. This version supports just the 4 ,6 and 8 Mbit.
Apollo DVD-er RT ||||||| 7 apollo.mpv Hhmmm, we expected more about this encoder. You may see that the VBR concept is not too perfect. We suppose that the Matrox RT2000 and the Pinnacle DC1000 could create similar quality because they have the same C-CUBE chipset. Btw. if we switched on the filters we got better result, but the picture been more smoothed.
AMBER DV2MPEG converter 00:41 |||||||

7

amber.mpv The picture is very sharp, the color fidelity is excellent, a typical Canopus quality in this relation. Very fast encoder,  uses the Amber board as encoding engine.This encoder could get 10 points in reliablity and usability. With very clean sources this encoder creates professional quality, btw.
RealMagic DVR RT ||||||| 7 dvr.mpv We could give one point as maximum to this encoder in realtion of installation. We made heroic struggle while installation. It was not easy. The documentation and the settings panel have a lot of bad informations, not to mention that it is crazy to set the PAL format. It seems the Sigma Designs's developer team does not know the used Visiontech's KFIR chip which implements just the 704 as horizontal resolution, the user can choose the 720 which will be not true. The realtime preview is great anyway.
MPEGator 2 RT |||||| 6 mpegator2.mpv That is a cheaper MPEG-2 realtime encoder. Uses a Visiontech chipset called MVCast which is an older chipset, and maybe this is why it does not support the VBR. The picture is very smoothed and the color of the mpeg is not the same as the original source, a litlle greener. This board has YUV input too, and using that the picture would be significally sharper, but it is impossibile to set the right color ballance, so unfortunatelly that input is unusable.
Vitec MPEG2 tools 03:52 |||||| 6 vitec.mpv Is not recommended for DVD, although is there a switch on the settings window referring to DVD, but choosing that the software switches to CBR mode. We know well why does it. The reason is the VBR method of this encoder. Completelly the same way as the BBMpeg's. See below.
DV 500 00:48 |||||| 6 dv500.mpv C-CUBE DVXpress chipset, just like on the Apollo. Hmmm, so we really don't know how could tell our opinion to don't get the Pinnacle to be offended. When you watch this stream on a TV do not think your TV is damaged. We were not able to create better q. stream. To most important problem is the flickering. Is there some problem with the field order what we couldn't solve even we tried everything. Not to mention these guys don't know that the VBR needs two parameters (at least!!!), the average bitrate and the peak.They are asking just for only one and the result will be 5000 as average and peak. We wouldn't buy this board just because of the MPEG encoding capabilities. The used chipset itself would be able to create better quality, by the way.
BBMpeg 1.2 06:25 ||||| 5 bbmpeg.mpv Smart & Free! Bravo! Can't create good VBR, btw. This software creates Constant Quality stream in the VBR mode and this results huge file. Is not worth to use this setting. Anyway, we suppose, the lot of settings at the advanced window could help the better quality creation. We haven't had time to try those settings.
MEGAPeg 21:40 ||| 3 digigami.mpv It is very slow and creates terribile bad quality. VBR not implemented. This is a joke.
DVMpeg 5.0 03:14 || 2 dvmpeg.mpv Strange, Darim is expert in MPEG technology. It seems this is not the favorite product of them. VBR is not implemented. We suppose they will improve the abilities of this encoder. It would be worth...
What the visitors are asking from us?

Much more information about the encoders

- Apropriate targets, such as VCD, SVCD, DVD, detailed description of features
Realtime hardware MPEG-2 encoder tests. Thus, we will test these encoders:

- Canopus Amber
- DV-Studio Apollo
- Darim MPEGator 2
- Optibase Fusion
Under negotiation: Matrox RT2000, Pinnacle DC1000, Zapex
MPEG-1 encoder tests

- Ligos, Xing, DVMPEG, PWI and others

So, now we have task for the next ten years...

 

--== 吴朝相 ==--
--== 搜新网 ==--
--== www.souxin.com ==--

 

本文章的所有权归搜新网所有,如果欲将其另作它用,请先联系站长,信箱是 soxin@21cn.com,谢谢!
 

°°°°°°


本站由WCX制作、维护 (C)2000 意见或建议 请OICQ联络:35871  或去信wcx98@163.net
本站始建于 1998 年 6 月 25 日