For NTSC material, transcode currently generates film mode, i.e., 23.976 fps
(progressive) for most NTSC DVD sources.
For generating NTSC MPEG video, the final result should be played at
29.97 fps. Therefore the encoder must set the appropriate
flags to force a decoder/player to generate a 3:2 pulldown
(telecine) on demand.
Transcode offers a long option "--pulldown" to encode to MPEG
video with the appropriate flags set and switching the display rate
from 23.976 to 29.97 fps.
Notes:
- [...] denote import/processing options.
- if the aspect ratio changes after resizing the video frame,
use "--export_asr code" to notify encoder. Possible aspect
ratio codes are: 1=1:1, 2=4:3, 3=16:9, 4=2.21:1.
- 3:2 pulldown flags must be enabled with long option "--pulldown"
- muliplex add-on audio track with "-s filename". tcmplex
supports 1 video and 2 audio tracks.
- enable sox re-sampling filter with "-J resample"
(optional) instead of export modules resampling feature.
- for encoding with mjpeg-tools, the use of mplex is
recommended.
- Use tcmplex option "-D" to adjust a possible AV mismatch.
VCD (352x240)
Video CD's have a restricted format for audio (MP2, 44100 Hz,
224 kBits/s, stereo) and video (MPEG-1, 352x240, 1152 kBits/s CBR) parameter.
The preset profiles take care of the VCD2.0 specification.
(S)VCD (480x480)
Super Video CD's have a less restricted format for audio (MP2, 44100 Hz,
32-384 kBits/s, stereo) and video (MPEG-2, 480x480, up to 2600
kBits/s VBR) parameter.
The preset profiles take care of the SVCD2.0 specification.
The default profile bitrate is 2376 kbps.
DVD compliant format
Possible frame parameter combination: 720x480, 704x480, 352x480 and 352x240.
For a video frame size of 352x240, resizing can be delegated to the
export module with "-F d,4", but this frame size is currently broken
in the exncoder, all other
values require use of transcode's resize options. The profile default
bitrate is 9800 kbps.
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