ProRes 720x486 Black Lines
Hello, hoping for a sanity check here.
I'm taking a lot of 1080p 23.976 HD masters and center cutting them down to 720x486 23.976 SD ProRes files (just following orders). When I do this, I get black lines at the top and bottom of the frame.
Now, my understanding is that these black lines should be there; it's the VBI, correct? My files keep getting rejected by the powers that be, because of those black lines. However, the client is also explicitly asking for 486 and not 480 so I can't just go that route.
I did notice that if I bring the files in to Final Cut Pro or view them in Quicktime 7, that the black bars remain, instead of being somehow "hidden" as would happen with another SD format such as IMX50. Is it possible this is just a metadata issue of some sort?
Attached is a frame grab, and below is a mediainfo readout of the file:
Quicktime 7 Player (and Frameworks) are deprecated.
Please test in Telestream Switch 2.0.1 and Quicktime X.
Please explain exactly what your settings are in the Resize Filter (be complete).
What version of Episode are you using (current is version 7).
Also please do describe intended use of the encoded file.
Same thing in Switch an Quicktime X.
I'm doing this in Vantage (not Episode) using the Quicktime (Telestream) encoder. For my Resize filter, I've tried both "Crop (Center Cut)" and Manual, with 0 crop and padding on top and bottom, and 240 pixel crop in from left and right. Both resize settings yield the same result. I do have the VBI settings enabled (which is the default) for 4 upper and 2 lower. I'm sure disabling this (setting it to full frame active picture) would get rid of the bars, but again, aren't they supposed to be there for 486 material?
[John Michaels] "I'm sure disabling this (setting it to full frame active picture) would get rid of the bars, but again, aren't they supposed to be there for 486 material?"
I think you should get rid of the bars especially if that's what they want. As to the 6 lines, HD to SD conversion can involve going to 720x480 source and one would need to add the lines (4 on top, 2 bottom as you mention) to get a 486 standard for broadcast. Those lines wouldn't be visible due to TV overscan.That wouldn't be VBI though. It its not for broadcast it can be left at 720x480 (DVD for example).
This is why I wonder what the intent is. Might there be a next stage where someone will add pull down frames and interlace? If it's for DVD use 720x480 would be fine. In fact one might do 720x480 anamorphic for SD 16x9 to keep the aspect ratio.
VBI would be 720x512. This is how I would deliver SD broadcast spots back in the day to DGFastchannel for distribution.