User guide

Elecard Converter Studio 59 User Guide
Control
Description
 11 bits — it is used only for MPEG-2 HL/HP encoding
The 10-bits precision is recommended to use.
Chroma Format
Specifies the resolution of chrominance data.
 4:2:0 — Half resolution in both dimensions (the most popular and
default for all presets including DVD)
 4:2:2 — Valid for the MPEG-2 High and 4:2:2 Profiles only
Quantization Type
Specifies the quantization scale type that is used for DCT coefficients quanti-
zation:
 Linear — it is used by default for MPEG-1.
 Non-linear — it is used by default for MPEG-2.
Scan Type
Specifies the scan pattern that defines the decoding order of variable length
coded DCT coefficients.
 Alternate scan — it is considered to be better for interlaced video.
 Zig-Zag scan — it suits better for progressive video.
Intra VLC
Specifies which of the two variable length coding (VLC) tables is used for the
intra coded blocks:
 Table 0 — it is used by default
 Table 1 — it is optimized for MPEG-2 encoding with 0.3 - 0.6 bit/pixel.
Picture structure
Specifies the picture structure when interlaced video is encoded.
Frame Sequence
Specifies whether the frame sequence in MPEG-2 stream is interlaced
or progressive.
Top Field First
Specifies which of the two fields of the interlaced frame comes earlier - the
top (odd) field or the bottom (even) one.
Pulldown
Allows converting video with 24 fps to 30 fps. This conversion is performed
with special headers that are added to the stream. That is why the number of
frames is not changed in the stream.
Frame Rate
Specifies the frame rate of the source file. Must be set before the
Pulldown mode activation.
Scene Change Detection
Specifies the scene changing detection (SCD) algorithm. This flag
causes the Encoder to insert I-frames when new scenes are detected.
If this option is enabled (recommended), the encoded stream quality
and positioning precision are improved.
Closed GOP
Enables the closed GOPs usage. If the feature is enabled, every frame is
located inside the GOP. It allows correct B-frame decoding during arbitrary
access to the stream data. The encoded video quality may become slightly
worse.
Adaptive GOP
Enables the adaptive GOP structure. When the video complexity is very high,
the encoder decreases number of B-frames to increase the encoding quality.
Recommended for permanent use.
VBV Size
Specifies size of VBV buffer. If this parameter is equal to zero, the encoder
automatically calculates the required buffer size.
Max rate
Specifies the maximum stream bitrate. It is set only in variable stream rate
mode.
GOP header time
Specifies the calculation method for the GOP header timestamps.
Start time
Specifies the first frame time (if timestamp values are calculated from the
frame number) or time shift relative to the PTS (if timestamp values are
calculated using the frame PTSs).
Closed Caption
Enables the saving of closed caption data while transcoding from MPEG-2 and
MPEG-4 AVC/H.264 streams into MPEG-2.
Pad Skipped Frames
Allows the encoder to detect gaps in the frame time stamps and
insert the skipped frames (by duplication).
Write sequence_header in
Every GOP
Specifies whether the sequence_header is inserted into every GOP or just
once at the beginning of the stream. Note that this option must be enabled
for VCD, SVCD and DVD encoding.
Write sequence_extension
Specifies whether the sequence_extension should be in every GOP. Some
devices have problems with playing SVCDs that are encoded with sequence
extensions.