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VirtualDub 1.6.14 released

New stable version is out, 1.6.14, which is just 1.6.13 with a few minor fixes and changes. For the most part creating this version was uneventful, except for the part where I coded a genetic algorithm to produce a Huffyuv frame that had a value encoded on the last DWORD of a frame that was exactly (multiple of 16K) - 32 bytes in size. I had to do this in order to replicate and verify a workaround for the random Huffyuv crash, which is caused by VLC decoding reading four bytes beyond the end of the frame.

Also, after another report, I tracked down the cause of the "vidc.draw" crash, where VirtualDub crashes trying to open an AVI file or bring up the video compression dialog on a codec with FOURCC "draw." Well, rather, I found a page on the Adobe Premiere Elements technical support site through Google that explains the problem. Basically, the crash is caused by the addition of a video codec entry in the Registry that has a space at the beginning of the filename. The behavior of the OS in this regard is rather strange — an attempt to open such entry with ICOpen() succeeds with a valid HIC, even though the codec filename is invalid, but any calls using that HIC crash in ICSendMessage(). I didn't put in a workaround for this, because it's unclear how to safely to do, but deleting the errant entry resolves the problem, and doing so can't make the problem any worse since whatever registered the bad entry obviously isn't using the codec that was supposed to be registered.


Build 24415 (1.6.14, stable): [March 12, 2006]
    [features added]
    * Added option to choose different disk I/O modes to tradeoff slower speed
      for better compatibility and system response.
    * Added /capfileinc switch to set filename and increment its trailing
      number to avoid existing files. 
    [bugs fixed]
    * Added workaround for video codecs that read beyond the end of the input
      buffer during Huffman/VLC decoding.
    * Fixed intermittent problems with writing AVI files to a network drive. 


This blog was originally open for comments when this entry was first posted, but was later closed and then removed due to spam and after a migration away from the original blog software. Unfortunately, it would have been a lot of work to reformat the comments to republish them. The author thanks everyone who posted comments and added to the discussion.