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Uncompressed from tape VS uncompressed live
I have the opportunity to capture straight into the decklink HD card live on set via SDI.. I assume this would be better than from SDI later from tape, but how much better? How compressed is the footage on the tape? re-compressed during capture? Camera source would be a Panasonic Varicam..
-Matthew
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4 Replies
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If you are going to capture to uncompressed coded – you will be impressed 😉
-Kaspar
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Hi Matthew,
I can’t say with any degree of confidence what the difference would be, but it seems that Varicams typically record to DVCProHD ? So the Wikipedia entry that follows might put it in perspective. Direct capture to 4:4:4 would be best if you have the bandwith & storage to manage it.from Wikipedia:
DVCPRO HD, also known as DVCPRO100, uses four parallel codecs and a coded video bitrate of 100 Mbit/s. Despite HD in its name, DVCPROHD downsamples native 720p/1080i signals to a lower resolution. 720p is downsampled from 1280×720 to 960×720, and 1080i is downsampled from 1920×1080 to 1280×1080 for 59.94i and 1440×1080 for 50i. Compression ratio is approximately 7:1. To maintain compatibility with HDSDI, DVCPRO100 equipment internally downsamples video during recording, and subsequently upsamples video during playback. A camcorder using as special variable-framerate (from 4 to 60 frame/s) variant of DVCPRO HD called VariCam is also available. All these variants are backward compatible but not forward compatible.
DVCPRO cassettes are always labeled with a pair of run times, the smaller of the two being the capacity for DVCPRO50. A “M” tape can hold up to 66/33 minutes of video. The color of the lid indicates the format: DVCPRO tapes have a yellow lid, longer “L” tapes made specially for DVCPRO50 have a blue lid and DVCPRO HD tapes have a red lid.
Happy shooting,
Jeff -
Do not use 4:4:4 RGB codec as the camera outputs only 4:2:2 so it would be just uneeded waste of bandwith and money you would need something to convert YUV to RGB
-Kaspar
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” Do not use 4:4:4 RGB codec as the camera outputs only 4:2:2 so it would be just uneeded waste of bandwith and money you would need something to convert YUV to RGB”
Yes! what was I thinking? I forgot 4:4:4 was an RGB, not YUV codec.
sorry
-jeff
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