MP4NameFirstMatches in mp4util.cpp in MP4v2 2.0.0 mishandles substrings of atom names, leading to use of an inappropriate data type for associated atoms. In MP4v2 2.0.0, there is an integer underflow (with resultant memory corruption) when parsing MP4Atom in mp4atom.cpp. MP4Atom::factory in mp4atom.cpp in MP4v2 2.0.0 incorrectly uses the MP4ItemAtom data type in a certain case where MP4DataAtom is required, which allows remote attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via a crafted MP4 file, because access to the data structure has different expectations about layout as a result of this type confusion. In MP4v2 2.0.0, there is an integer overflow (with resultant memory corruption) when resizing MP4Array for the ftyp atom in mp4array.h. A dangling pointer is freed again in the destructor once an exception is triggered. This can be found under Tools>Preferences>Output Files.MP4Integer32Property::Read in atom_avcC.cpp in MP4v2 2.1.0 allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted MP4 file.Ī double free exists in the MP4StringProperty class in mp4property.cpp in MP4v2 2.0.0. It is also recommended to ensure that the preferences for Handbrake are set to MP4 as well, otherwise the output format may default to M4V (which would not be able to upload). Here is a link to download the Knowmia Handbrake Preset. We will also provide a Handbrake Preset from the following link that can be imported by going to Presets>Import from File. Below is a link to download Handbrake, a free media conversion tool and a video showing the steps necessary to create an MP4 that can be successfully uploaded directly to the Knowmia website.ĭownload for Handbrake: Handbrake Website

Solutionįor unsupported video file formats (MTS, MOV, etc.) as well as MP4 files that are using the H.265 codec, please convert the files to the H.264 MP4 format before uploading. I am having issues uploading a video using the Knowmia (formerly TechSmith Relay) Classic Recorder Batch Upload, or the Web Upload option.

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