AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |
Back to Blog
Xvid decompressor for virtualdub4/19/2023 ![]() ![]() There are times when it appears based on the photo sensor data that perhaps the frame doesn't change, and a few frames might be skipped in order for the computer to catch up. The photo sensor data is being recorded and we are trying to see how well the video frame times match up to the luminance changes detected by the photo sensor. The luminance changes every two frames in an ascending/descending order (so, if I'm listing the luminance level for EACH frame, it should look like: dark-dark-gray-gray-white-white-gray-gray-dark-dark-.etc.). We have a photo sensor attached to the monitor and have placed a small square in the corner of each frame of the video that changes among 3 levels of luminance (black, gray, white). Some newer devices are shipping with a Windows Driver Model (WDM) driver, that VFW programs can only use through a Microsoft conversion wrapper this wrapper doesn't always work very well and generally can't cope with IEEE-1394 ("FireWire") devices at all, such as DV camcorders.As a practice test, we have downloaded a TED talk (mp4) and converted it into an AVI file for Presentation. VirtualDub says it can't connect to my capture device.? VirtualDub requires a Video for Windows (VFW) compatible device to capture video. Capturingįor more tips on capturing, see documentation on capturing. Note that it is not a good idea to have more than MP3 codec installed as the Windows Audio Compression Manager doesn't distinguish between multiple codecs with the same format very well, and programs may not use the specific codec that you choose. when compressing to MP3? This is caused by the Creative Labs MP3 codec - disable or lower its priority in the Multimedia control panel. Why does VirtualDub freeze at frame 9995, 9997, etc. VirtualDub ignores filename extensions when detecting the type of a file for that matter, so do many players. MPEG-1 video data can't be streamed into an AVI file due to bidirectional motion prediction. Why do I get "Direct stream copy cannot be used with this video stream" errors when I try to edit my AVI file? You don't actually have an AVI file - you have an MPEG-1 file that has been renamed to have the. ![]() There are no such restrictions when decompressing or recompressing a video stream. Whenever VirtualDub detects a violation of this rule it automatically adds in frames back to the previous key frame to fix the problem. This rule is imposed by the way video is compressed. Essentially, any blocks of video you remove have to end right before a key frame (shows up as ), although they can begin anywhere. Specifically, you can only remove a non-key-frame (shows up as beside the timestamp window) if you also remove the frame before it. How come parts that I've deleted get stuck back in the file? When editing in Direct video mode, there are some limitations on where cuts can occur. Editingįor more tips on capturing, see documentation on editing. ![]() And no, I won't tell you where to get one. You need to install a better one to get higher bitrate support. How do I get VirtualDub to encode 128Kbps MP3? The MP3 encoding capability you're seeing isn't in VirtualDub - it's being provided by an audio codec you have installed in your system. VirtualDub's MPEG-1 parser is intolerant to errors compared to its AVI parser, so unfortunately there is no easy solution to the latter problem. You have an MPEG-1 file that is corrupted.You have an MPEG-2 file, which VirtualDub doesn't support.What does "Packet sync error" mean? I get it when I try to open my MPEG file. I don't have a desire to write an MPEG-1 encoder at this point. Can VirtualDub write MPEG-1 files? No, only read them. Input/Output Can VirtualDub read QuickTime, MPEG-2, RealMedia, or ASF files? No, and installing codecs won't help. However, the current 32-bit versions run fine under 64-bit Windows. Is there an AMD64 (x86-64) version? Not yet. MMX, SSE, and SSE2 optimizations in the normal build will automatically kick in as appropriate on AMD CPUs. Is there an Athlon-optimized version? No, and I have no plans to make one, as I don't have a compiler that specifically targets Athlon anyway. Some people have made unofficial modified versions in the past that did, but the official versions never had those features. How come the current versions don't? No, they didn't. Previous versions used to have MP3 audio source support, VBR audio support, etc. All 32-bit x86 versions of Windows are supported except for Windows CE and versions of Windows NT prior to 4.0. Is VirtualDub compatible with Windows XP? Yes - in fact, both of my development platforms are now XP-based. Basic questionsįor more tips in general, see VirtualDub's online documentation. VirtualDub documentation: FAQ Here are some answers to questions I get asked way too often. ![]()
0 Comments
Read More
Leave a Reply. |