Frage von urra:
Hello, we draw s.der university lectures and to take the laptop to the teachers by Epiphan USB capture device from (so you can their usual environment for film and application demonstrations). The capture device digitizes the signal and VGA schleust in one of our laptops On. Basically, they can frame rates of 30 fps produce. It plays but the codec used with the video store is a big role. We would like to see frame rates of 10-15 FPS at animations also to be recorded. The Epiphan software (VGA2USB) can basically use any installed codec. Experiments with the TechSmith Screen Capture codec of Camtasia produced unfortunately rather low frame rate 8-10 fps, and data sets of about 8 GB for 90 minutes. For XVid we live fast encoding and low data volumes of <1 GB. However, the post with Adobe CS 3 very tough. To cut 90 minutes and corrected back to disk to go capture a few hours lost.
Can anyone recommend a codec, which offers a good compromise between Encodiergeschwindigkeit (frame rate), size (<4GB for 90 min) and recoding or speed post represents?
You would help us a lot, because we have with modest hardware to work under time pressure.
Best Regards,
Andreas
Antwort von olipool:
Hi,
So my first question would be, you are bound s.dieses vga2usb? Would it be possible for the lecturers Camtasia Calculator to install? Or there is no side of lecturers keen?
Second question, what is with the converter because of the Picture? And what content is shown in the lecture? Many of changing images and animations? Normally 4 hours, you can slide with the TechSmith codec to 800MB bring at 15fps, but it's just synonymous to the quantity of action. I think the hook is s.dieser converter history.
Do not be so synonymous Camtasia be enough so synonymous SnagIt or synonymous gibts a couple of freeware tools I think.
Antwort von urra:
Hello,
First many thanks for the feedback! We are tatäschlich s.das tool VGA2USB bound, because it controls the Epiphan. Without the device, we can not respond. From installation of Camtasia on the faculty computers, we have deliberately refrained, because there are many implications that brings with, ranging from intrusion into their private data on laptops all the way to licensing model. Leadership, we have laptops, but are synonymous away from, because it always your own applications, etc. for teaching use. In large part, however, there are actually more or less static slides, what to do on the screen is shown. In this respect it surprised me that the TechSmith codec such large files. It is worth mentioning that we are the problem not as strong, if we DVI2USB with the device can work. Unfortunately, only in very few cases. The lecture hall infrastructure compels us to VGA signals. It seems as if the VGA signal is so impure that it similar to real-video-data small but intense noise generated. The DVI solution is actually smaller amounts of data.
I was in the direction of motion-JPEG thought. Is there any good free codec? Or is the wrong approach already?
Grüße, Andreas
Antwort von olipool:
Hm well, silly that the optimal solution is always in the way things are. I think synonymous digitizing brings purely as interference, one could try to save before a filter over it to run but that is probably of the infrastructure and synonymous nciht it.
What comes of it, it must necessarily have in capturing small? Or simply s.Ende in providing for others? And how long can the maximum time? Otherwise, perhaps not even possible with Quicktime H.264 s.Ende to export? With the appropriate tools to get as synonymous with real fullscreen video units as 30 minutes to 100MB.
The best do you do a few test runs with different codecs.
MJPEG you need to try synonymous obs is small enough. You have obviously synonymous in mind that the subsequent recipient as the codec should be already available.
ps I have a free place but you can not tell what is good: http://www.free-codecs.com/download/Motion_JPEG_Codec.htm
Antwort von Marco:
I preferred using the FM Screen Capture Codec. While already a few years old, but my opinion is still one of the best for this purpose (and also free). The compression is adjustable, the codec is lossless. It could, however, regarding the problematic Filesize that has a VGA signal einlest instead of being an Screencapturing directly into a file into it to make.
Marco
Antwort von Gast 0815:
Hello Andreas,
as far as I know there are truly free as M-JPEG codec is only one. The Vfw is on the interface of ffdshow (http://sourceforge.net/project/showfiles.php?group_id=173941) addressable.
Otherwise you could still try to Xvid, the "workability" to improve by playing the Keyframeintervall significantly verkleinerst and / or the number of B-frames reduzierst (or even completely off), both synonymous but leads to larger files again .. ..
Greetings from Marburg
Antwort von thos-berlin:
I understand the exact target application yet. There should be a refresh Resolutionund be captured by the target application. If the final product as a s.Television anschaubares video, so is PAL 720x676 to choose, especially if it is with camera images of the faculty is mixed. This would then PAL DV-AVI (then with 13 GB / hour) or space saving his solll, MPEG, into question. I understand the current disk prices this size restrictions "is not.
Would be important to me that in the processing chain to run the format is changed since then permananet umcodiert is hampering the Quallität effect and also a great time needs. As long as possible in the "native" resolution editing and - if necessary - until s.Ende to a different format to convert.
Antwort von urra:
Thank you for the many suggestions! Thus, we have something for you to try.
To respond to the questions on the application to come: The file size when capturing, we like to hold a few GB, as we along with the slides synonymous Lecturers in the PAL-DV record and thus almost 17 GB of video data per 90 min lectures plus . We need to copy a lot about Network, which currently only 10 Mbit can. Copy and therefore need to encode both a lot of precious time. We subscribe to several daily lectures. Since we would like to try to save time when it allowed the technique anyway.
We capture in the native Resolutiondes faculty laptops. Most 1024x768. Therefore, the DV codec is not in question, to my knowledge the only TV Resolutions dominated.
Encoding and editing are separate processing steps, because we cut the films overnight in a queue durchrechnen leave. This leaves us with the calculator on day off to cut. Therefore, we need an intermediate step in which the raw data, the video files are generated, which later in the encoder can give (Sorenson Squeeze). At the end of the streaming-enabled FLVs for our Flash Media Server. In this intermediate step we currently inhibits the XVID format, because it's our calculator again a few hours encode-time.
The non-encoded data, we move to a backup server, so that we later wish to further format can produce. Here's our 10 MBit Network as a barrier to do so.
S.alle Again many thanks for the help!
Antwort von thos-berlin:
If you read the materials miteinder verschneidet should put the outset of the target capture resolution. That would be just DV 720x576, but the format would be to cut already agree.
As I understand, the teachers take their PC into a TV image regardless of Resolutionund to refresh. Then divorce her, together with the DV Recording. (Or is my mistake and thought it intersects not together). But it's 720x576 then so did you ever seen a transforming step for you if necessary during their capture in 702x576 saves. I must in this case not only the resolution but still synonymous align the image number. That must simply take a long time ...
What is the Endauflösung?
Antwort von Wotan:
For the Resolutionbei the data-quality is certainly MPEG4 the only solution. Wmv would record with the security processing is friendly, but so synonymous Larger files for equivalent quality as DIVX. Equivalent in processing capability, and quality encodiergeschwindigkeit I would appreciate quicktime h.264 versions.
If your program supports Windows media encoder, then you can possibly manage by prx files.
Have fun trying!
Antwort von olipool:
Looking at the screen while capturing from the Prof has been reduced but arge losses readability. In full resolution then Can you still single and get some clips slide. Synonymous, I think rather that the DV capture the picture in picture to be inserted and not vice versa.
