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OTHER: Differences between 1080/23.98p, 1080/23.98pA, and 1080/23.98pN
- Thread starter Phil1076
- Start date
Barry_Green
Moderator
23.98 (more accurately 23.976) is the frame rate of the video, obviously.
There are three ways to record 23.976 (aka "24p") on an HPX250:
1) 24pN. This is available in 1080p AVC-Intra, 720p AVC-Intra and 720p DVCPRO-HD. It means that only the actual frames are recorded, with no "padding", no "duplication", and no "pulldown". As such, it also takes up less space; 1080/30p AVC-I takes up 100 megabits, but 1080/24pN AVC-I takes up 80 megabits. 20% fewer frames = 20% less bitrate used.
2) 24pA = only applicable to 1080i/24pA DVCPR0-HD and 480i/24pA DV/DVCPRO formats. In DVCPRO-HD 1080, all recordings are done using 60i interlaced recording; that's all the recording format supports. Progressive is embedded seamlessly and flawlessly within the interlaced signal using frame/field flags; 30p or 24p can be extracted from within a 60i recording fully perfectly reconstituted. 24pA is a simple way of embedding 24p within 60i; it effectively means that four 24p frames are directly converted to four field-pair frames, and then one "duplicate" frame is created to round out the sequence. In the NLE, it just ignores the duplicate frame and voila - you have true original 24p footage.
3) 24P = DVCPRO-HD or DVCPRO formats, recording 24p within an interlaced data stream. This method uses 2:3 pulldown, spreading four progressive frames across five interlaced video frames. This gives somewhat smoother playback and is more suitable for intercutting on a 60i timeline. It can be IVTC'd (reverse telecine or inverse telecine) to strip out the pulldown and be converted back to its original 24p form.
There are three ways to record 23.976 (aka "24p") on an HPX250:
1) 24pN. This is available in 1080p AVC-Intra, 720p AVC-Intra and 720p DVCPRO-HD. It means that only the actual frames are recorded, with no "padding", no "duplication", and no "pulldown". As such, it also takes up less space; 1080/30p AVC-I takes up 100 megabits, but 1080/24pN AVC-I takes up 80 megabits. 20% fewer frames = 20% less bitrate used.
2) 24pA = only applicable to 1080i/24pA DVCPR0-HD and 480i/24pA DV/DVCPRO formats. In DVCPRO-HD 1080, all recordings are done using 60i interlaced recording; that's all the recording format supports. Progressive is embedded seamlessly and flawlessly within the interlaced signal using frame/field flags; 30p or 24p can be extracted from within a 60i recording fully perfectly reconstituted. 24pA is a simple way of embedding 24p within 60i; it effectively means that four 24p frames are directly converted to four field-pair frames, and then one "duplicate" frame is created to round out the sequence. In the NLE, it just ignores the duplicate frame and voila - you have true original 24p footage.
3) 24P = DVCPRO-HD or DVCPRO formats, recording 24p within an interlaced data stream. This method uses 2:3 pulldown, spreading four progressive frames across five interlaced video frames. This gives somewhat smoother playback and is more suitable for intercutting on a 60i timeline. It can be IVTC'd (reverse telecine or inverse telecine) to strip out the pulldown and be converted back to its original 24p form.
Barry_Green
Moderator
SDI output is always 1080/60i or 720/60p. 24p gets embedded within that 60i/60p signal using 2:3 pulldown.one quick question:
when 24PN is selected what does the SDI port output in terms of frame rate?