Search the Community
Showing results for tags 'bitrate'.
-
Hello all, I am looking for information about the HDMI output on the A7S II that I can't seem to find anywhere else. Essentially, what is the data rate of the uncompressed HDMI signal from the sensor, and does it vary between resolution and frame rates? The A7S II is capable of outputting an uncompressed 8-bit 422 signal via its HDMI port. So many people get so caught up in the color bit depth advantage here, but very few talk about the increased data rate/bitrate that is available. This data rate increase is especially important for me due to the high-detailed, moving images I tend to shoot (a lot of nature footage on a gimbal stabilizer where the entire frame is in focus). High detail, high contrast imagery that moves through a frame tends to get heavily compressed internally by low bitrate codecs, essentially throwing away information in moving parts of the image and hoping you won't notice. (There's a great article by Art Adams at Provideo Coalition about codecs and compression that explains this in greater detail here: https://www.provideocoalition.com/here-are-my-rules-of-thumb-when-choosing-a-codec/) As a rule of thumb, a higher data rate/bitrate equals sharper, better quality footage with reduced blocky artifacts because less compression is being applied and there is a greater amount of data stored within the codec. There is more to this than just data rates (such as the complicated codec algorithms), but we won't go into that here. Essentially, I'm just looking for the data rate of the uncompressed HDMI signal available from the A7S Mk. II, so that I can properly choose an external recorder with the capabilities needed to record this signal at the highest possible quality. If anyone can provide this information, and/or point to where you found the information, that would be extremely helpful! Thanks!
-
Hi everybody :) Newbie Alpha user here... I recently got my a6400 and loving it. I'm planning to use it for some (music) videos soon, and I was hoping that I could get a few things bit more clarified by someone more experienced. As I understood, to get more cinematic-like effect I should stick to 24p(in NTSC mode), so my options are: When File Format is set to [XAVC S 4K] -> 24p 100M or 24p 60M When File Format is set to [XAVC S HD] -> 24p 50M ... So, is 100M gonna get more data than 60M which is gonna enable to create a slow motion footage in 4K..? Or I should - If I wish to create a slow motion footage - select one of these (while in [XAVC S HD]): 120p 100M/100p 100M 120p 60M/100p 60M Then slow it down in Premiere, and convert it to 24p..? ... I got a bit confused with all these options, apologies if I'm asking anything too obvious :D Thanks a lot for all the help!
-
- video
- file format
-
(and 2 more)
Tagged with: