MVCD
The MVCD (Mole Video CD) is a non-standard video CD (VCD) with a playback time of around 2 hours per CD .
A normal VCD is encoded in the MPEG-1 process with constant bit rate (CBR), ie all scenes are encoded with a standard 1150 kbit / s for the video stream, regardless of whether it is a fast action scene or a quiet conversation.
The MVCD is coded MPEG-1 or MPEG-2 with variable bit rate (VBR), ie the bit rate is reduced to e.g. B. 2000 kbit / s increased, but lowered to 270 kbit / s in very quiet scenes. It is also with a modified quantization - Matrix worked and the bit rate of the will to win additional space MP2 -Tons reduced from 224 kbit / s (VCD standard) usually at 128 kbit / s. The normal MVCD does not change the GOP in favor of compatibility. MVCDs with an extended GOP are called MVCDex and offer an even longer playback time, but these can lead to problems with some DVD players .
By closely following the SVCD standard (here "variable bit rate"), most DVD players can play MVCDs in VCD resolution (352 × 288 television standards PAL or 352 × 240 NTSC ). Experience has shown that cheap DVD players in particular rarely have problems here. An MSVCD created with the MVCD templates (i.e. 480 × 576 MPEG-2 PAL) has the same structure as a standard SVCD, except that you are able to get by with a lower bit rate with approximately the same image quality. This makes it possible to burn a complete 90 to 120 minute film in almost SVCD quality on a CDR80 and play it on any SVCD-capable DVD player.
MVCDs are created with the help of the MPEG encoder software TMPGenc and the associated templates (presettings) offered by MoleVCD . There are templates for resolutions from 352 × 288 (VCD) to 480 × 576 (SVCD) up to 720 × 576 (DVD) for PAL and NTSC .
Historically, this VCD production method, also referred to as eXtended VCD XVCD , comes from the experience of Kwaq (KVCD) and Mole, among others, but from version 2.5 (July 2003) was completely redesigned by roc with the help of the MVCD community. Other formats such as RSVCD , AVCD , XVCD, DVCD or TVCD differ essentially in terms of resolution, bit rate, GOP and the quantization matrix used. Users of these variants should be aware of possible compatibility problems, e.g. B. Pay attention to the area of "permitted resolutions" or GOP values that are too extreme!