Cinegy and MPEG

This parameter defines the frame size in pixels horizontally and vertically. The frame size can be smaller than the physical size of the original video, for example, in the case of very low bit rate streams.

The typical settings are:

Here are some examples:

Horizontal size can be 1, 3/4, 1/2, 1/3, 1/4 or 1/8 of the actual frame size.

Vertical size can be 1 or 1/2 of the actual frame size.

This parameter defines the physical frame size in pixels.

This parameter defines the aspect ratio for the output stream.

This parameter makes sense only for the Standard Definition TV and the possible values are:

These switches define the video system for the output stream.

This parameter defines the field order in each frame. The values are:

To create the IMX profile, add /D10 switch and set up the bit rate (30, 40, 50 Mbps).

This parameter defines the MPEG-2 profile and level. Cinegy Cinecoder provides a full set of the MPEG-2 profiles and levels. The most frequently used profiles are:

This parameter sets up the VBV buffer size.

The Video Buffer Verifier (VBV) is a model hypothetical decoder buffer that will not overflow or underflow when fed a conforming MPEG bit stream. Thus, part of the definition of a compliant stream is that it does not cause underflow or overflow of this model buffer.

The VBV verifies the outgoing MPEG stream rate at the virtual decoding device to prevent data overflow or underflow during the decoding process. A playback device that has a small VBV may fail playing back high quality streams if the buffer is too small.

This parameter sets up the Intra DC precision of the compressed blocks and can possess values in the range of 8 to 11 bits. The values of 10 – 11 are allowed for High Levels only.

Normally, the value of 9 is suitable for all needs. Consider 10 or 11 for high bit rate 4:2:2 encoding. Consider 8 for very low bit rates.

This parameter defines the chroma format.

The possible values are:

The parameter selects a search method for motion estimation:

This key enables the interlaced search. This allows you to search not in the frame, but separately in two fields. For progressive video, it is preferable to disable this parameter to increase the encoding speed.

This parameter "enhances" the /INTSEARCH key, allowing the search in the semi-blocks of the opposite fields.

This key allows the search with half-pixel precision.

This setting can decrease the amount of bits required for the motion description if the actual vectors are small enough compared to the search window (see /SWIN).

This key forces the use of the motion vector statistics (collected with previous encoding) to find better vectors faster.

This key allows an additional search after the /PREDBLK procedure, if the found vector "is not good enough".

This parameter specifies the maximum search window size in pixels.

This parameter is relevant to the formats with P and B frames. The recommended value for SD is 64. Setting this to 32 can decrease the CPU load on a one-CPU machine, but will affect the quality of compression.

This parameter specifies the level of down-sampling for the search (1,2,4) and the search zone increment for the upper level.

For example, when down-sampling is set to "2", it means that the search will be made on a 360x288 picture instead of 720x576 and the search window will also be halved.

The second argument is the up-sampling zone increment. When returning from the down-sample level to the upper one, the vector needs to be recalculated in the 2x2 up-sample area.

The parameter "zone increment" extends this area (when positive) to 4x4 (=1), 6x6 (=2), etc.

Some combinations are:

Make all GOP closed (i.e. not containing any references to the frames from the previous GOP). This setting is recommended for Cinegy software encoding, as it makes access to video faster.

If the GOP is open, the first B-frames will orientate themselves to the last P-frame of the previous GOP. If the GOP is closed, B- and P-frames orientate themselves to the I-frame at the beginning of the GOP. The decoder does not need to read the previous GOP and can start the decoding process straight away.

Duplicate Sequence header with each GOP.

The Sequence header holds all necessary information about the MPEG stream, such as resolution, frequency, bit rate, etc. The /DUP parameter tells the encoder to duplicate this information with every GOP to simplify access to the MPEG steam.

Preserve the defined GOP structure even for the closed GOP.

In this mode, the first B-frames of each GOP are encoded without any references to the last P-frame from the previous GOP and are actually the P-frames with the reference forward.

This mode is less compression efficient; therefore, use it only in some very special cases.

This flag disables padding in the case of the bit rate being too low (for example, with black frames).

Enable automatic scene detection. This setting can produce GOPs of different length.

Each frame is coded as a pair of fields.

I-frames are coded as a pair of fields; the other frames are coded as full frames.

This picture structure depends on the frame contents selected automatically.

This key enables automatic detection of the DCT encoding type for every macro block (interlaced or progressive). Without the key, all the blocks will be encoded as progressive.

This parameter enables automatic detection of the coefficient scan pattern (Zigzag or Alternate) for the blocks.

This parameter defines standards for the chroma representation on the display devices:

This parameter enables the blur filter (in percent) to the source video. The typical values are:

This key enables the transport stream multiplexer. It works with the /MPEG2 flag only.

This flag forces all the frames to align into packets.

This flag forces the audio-only MPEG output.

This flag forces the video-only MPEG output.

This parameter specifies the audio layer. The valid values are:

This parameter specifies audio mode. The valid values are:

This parameter specifies the audio bit rate in Kbit/s.

This parameter specifies the audio frequency in Hz. Depending on the target format, the set of frequencies may be limited. The following frequencies are used in MPEG:

Profile – defines the named group of settings;

object – defines the named object instance.

name – defines a unique profile name.

<ANY> – any named parameter may be included into the profile.

name – defines the unique object name;

type – defines the object instance type, e.g.:

profiles – defines the named profile instance from the current schema.

profile – defines the internal profile instance for the current object;

<CUSTOM> – a list of possible tags depends on the object type.

The following values are supported:

This parameter specifies the audio frequency in Hz. The typical values are: 96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050, 16000, 12000, 11025, 8000, 7350.

This parameter specifies the number of audio channels. You can define 1, 2, 3, 4, 5, 6 or 8 audio channels.

This parameter specifies the audio bit rate in bit/s (from 1000 to 320000). It is recommended to set the BitRate parameter multiple of 16.

The following values are supported:

This parameter defines the profile level. The following table displays all the available levels and describes the supported maximum macroblock and video bit rate parameters:

This parameter defines bit rate mode of the video stream. The values are:

This parameter defines the available bit rate of the video stream. The meaning depends on the RateMode parameter value.

This parameter defines the average bit rate of the stream. The value should be between the maximum and minimum bit rates.

This parameter defines the minimum bit rate of the video stream.

This parameter defines the frame rate in ratio num/denom. The following frame rate values are supported:

This parameter defines the frame size in pixels horizontally (cx) and vertically (cy). The frame size can be smaller than the actual video size, for example, in the case of very low bit rate streams. The typical settings are:

This parameter defines the aspect ratio as num:denom (for example, 4:3 or 16:9).

This parameter defines the Instantaneous Decoding Refresh (IDR) period for a video.

This parameter specifies the Group of Picture (GOP) structure, where:

N – defines the GOP length (from 1 to 255);

M – defines the distance between two anchor frames: I or P (from 0 to 127).

The typical values are:

This parameter defines the field order in each frame. The values are:

This parameter defines the frame-coding rule.

This parameter defines the macroblock-coding rule.

This parameter defines the entropy coding algorithm.