SD cards for high bitrate footage, discussion
- Thread starter dbwolfe
- Start date
Tesselator
Active member
No one seems to have addressed your question here.
Yes, as far as I understand things there could indeed be a performance difference. I read this from an internal engineering document that was published to the internet (probably with some revisions and formatting added) about a year or so ago. There were a few factors involved as to why but I forget just now what they were. I also forget whether the difference was slower when larger or faster when larger but I believe it was larger = slower. Also we're not talking about very much of a difference here (which is probably why I don't remember!). Some tho. It seemed like it was just enough to be verifiable - like ( I really can't remember now but) about or less than 10 seconds per gig throughput.
Anyway, there can be a difference. I just wish I could remember specifically how much. It's tough being 81 sometimes.
rogar-SunGlass(DBG
Last edited:
Guys, today I was being rung up at fry's for a 16gb class ten Panasonic card, which unfortunately they then told me they didn't have, and talked me into a 16gb Kingston class 10.
Both the Panasonic and the Kingston promised write speeds of 22 mbs as opposed to the Patriot class 10 (half the price) which promised only 10 mbs.
However, the Kingston locked up today at 10 seconds everytime with the settings from the 'stable' thread for 720 4:2:2 mjpeg.
Both the Panasonic and the Kingston promised write speeds of 22 mbs as opposed to the Patriot class 10 (half the price) which promised only 10 mbs.
However, the Kingston locked up today at 10 seconds everytime with the settings from the 'stable' thread for 720 4:2:2 mjpeg.
Did you try the 4:2:0 settings for mjpeg too Kellar?
Brian@202020
Veteran
I just bought a 32gig Patriot Class 10 card. It'll arrive this week along with my GH1. I haven't seen any results from testing with that card yet. Should I have gotten a different card?
Barry_Green
Moderator
Kit lens and manual lens (Zeiss ZF)... same result.
Barry_Green
Moderator
I have an Extreme III 4GB card, it fails just like all my others. I don't have a SanDisk Extreme, which has the 30MB/S printed on it. That would be my next hope.
Ken Steadman
Well-known member
I bought one Saturday and used it today with D settings and it locked up on me many times. Granted, I was really working the codec hard on a steadicam in a field of tall grass.
I'm really not the expert Brian, I just know I almost bought a Patriot in Frys, but was curious why it was so much less money, and then I saw that even though it was class Ten, it promised a lower data rate, so I went with the Kingston.
However, I'm pretty upset, because that Kingston I bought this morning just became unreadable in camera or on my computer...so who knows how that affected my test shots today...arg...gotta see if Fry's will take it back...they'd better.
el cheapo buffalo class 6 16GB card works
el cheapo buffalo class 6 16GB card works
I am just wondering if it has a lot to do with write speeds of cards. I am using a cheap buffalo 16GB class 6 card (30€) and I am able to do both 1440x1080p MJPEG and 32Mbits/s AVCHD (with Pappas /jobless "safe" settings). I have one of the first japanese NTSC GH1 models (now patched to german, thank you Tester13!).
Yes, it does freeze sometimes on very highly detailed scenes. I was in the woods yesterday (highest detail possible) and I found that out of 40 scenes two didn't work (with the kit lens, auto focus, aperture priority).
On those which caused the cam to freeze during recording (always within the first second) I found that if you start exactly the same scene with less detail (e.g. pointing it initially somewhere else) and then panning rather fast back to the original it worked.
This gave me the impression that if you hit "record", the card needs some time to reach full writing speed, like two control algorithms (one in the cam and one in the SD card) needed some time to adjust to each other. The total clip was 12s and it had a file size of 100MB (way above class 6 = 6MB/s), indicating roughly 70Mbits/s.
Hope this helps. File is available if needed.
P.S.: Same scenario on the 1080p AVCHD footage
el cheapo buffalo class 6 16GB card works
I am just wondering if it has a lot to do with write speeds of cards. I am using a cheap buffalo 16GB class 6 card (30€) and I am able to do both 1440x1080p MJPEG and 32Mbits/s AVCHD (with Pappas /jobless "safe" settings). I have one of the first japanese NTSC GH1 models (now patched to german, thank you Tester13!).
Yes, it does freeze sometimes on very highly detailed scenes. I was in the woods yesterday (highest detail possible) and I found that out of 40 scenes two didn't work (with the kit lens, auto focus, aperture priority).
On those which caused the cam to freeze during recording (always within the first second) I found that if you start exactly the same scene with less detail (e.g. pointing it initially somewhere else) and then panning rather fast back to the original it worked.
This gave me the impression that if you hit "record", the card needs some time to reach full writing speed, like two control algorithms (one in the cam and one in the SD card) needed some time to adjust to each other. The total clip was 12s and it had a file size of 100MB (way above class 6 = 6MB/s), indicating roughly 70Mbits/s.
Hope this helps. File is available if needed.
P.S.: Same scenario on the 1080p AVCHD footage
Last edited:
Tons of write speed errors with my new Sandisk Extreme 8GB card today. Definitely not the direction I hoped to be moving in :furious3:
I was shooting stuff that would really stretch the codec (crazy detailed nature scenes in deep focus on the 14mm GH1 lens), so not a total surprise but still disappointing.
My settings were the typical "D" AVCHD settings. I had Pappas's 1440 MJPEG settings as well with 4:2:2 but that was a total no-go, lucky to get a couple seconds recorded before quitting, so I focused on AVC 1080p. Back to the drawing board...
Also should mention, it's a sweltering 94 degrees outside here today, with humidity of about 50%, so maybe that's stressing the camera as well.
I was shooting stuff that would really stretch the codec (crazy detailed nature scenes in deep focus on the 14mm GH1 lens), so not a total surprise but still disappointing.
My settings were the typical "D" AVCHD settings. I had Pappas's 1440 MJPEG settings as well with 4:2:2 but that was a total no-go, lucky to get a couple seconds recorded before quitting, so I focused on AVC 1080p. Back to the drawing board...
Also should mention, it's a sweltering 94 degrees outside here today, with humidity of about 50%, so maybe that's stressing the camera as well.
You might have better luck with switchin 422 off as it dont work for me with it on.
Thats really odd as pappa's been using a sandisk extreme 8gb 30mb class 10 also (and hes getting 1080x1280 with it)...mines in the post should get it tomorrow...if no luck goes back to amazon.
Might stick with my verbatims.
PappasArts
Veteran
Hey Oedipax,
As I wrote in the first post on this thread where I update new settings and info when it comes in-
http://www.dvxuser.com/V6/showthread.php?t=213364
<<<<<< MJPEG 4:2:2- SELECTION IS OPTIONAL - THIS ADDS OVERHEAD TO THE BITRATE- IN 1080P I DON'T SEE A MAJOR DIFFERENCE IN QUALITY- MORE RESEARCH NEEDED
**METHOD 2. 1280X1080P DVCPROHD SQUEEZE FRAME METHOD- This process gives a little more head room if you choose 4:2:2 color space than Method 1.
Remember 4:2:2 adds more data, and is still under research. For best bandwidth performance- Don't use 4:2:2 in either 1080P mode >>>>>>
4:2:2 and 1440X1080 is banging the top end of the maximum bit rate possible- any high detail pushes it over, and spikes the data rate. Then the error happens in most cases. METHOD 2- is more relibable with 4:2:2, however it's close, but gives just enough headroom....
Pappas
I'm beginning to think SDHC cards have VERY LITTLE quality control. Using brand new 8 gig Sandisk Class 6 Extreme "HD Video" I get write speed errors left and right. (With Pappas "D" settings.) Using old "crappy" PNY 4 gig class 4...and 1/2 full I might add.... I can't get it to fail!
Any possible explanations for this before we all wildly start trying SDHC cards would be appreciated.
Edit: I just tried a 512mb micro sdhc card that came free with my cell phone a couple years ago...guess what... I couldn't trigger a write error!
Any possible explanations for this before we all wildly start trying SDHC cards would be appreciated.
Edit: I just tried a 512mb micro sdhc card that came free with my cell phone a couple years ago...guess what... I couldn't trigger a write error!
Last edited: