[XviD-devel] Custom Quantization MPEG-4 compatiblily issue?
suxen_drol
xvid-devel@xvid.org
Wed, 15 Jan 2003 21:08:07 +1100
On Sun, 12 Jan 2003 15:00:01 +0100 (CET) Christoph Lampert <chl@math.uni-bonn.de> wrote:
>
> Hi,
>
> I just tried to create a .m4v stream with branch and include this into a
> mp4 file using mp4creator from the mpeg4ip-package.
>
> It failed, when I included a custom matrix with the error:
>
> MP4ERROR: MP4WriteCountedString: Numerical result out of range
>
>
> Does XVID do this somehow in a non-standard way?
just gave it a try (mp4creator -create=custom.avi custom.mp4), and i
i got a similar error: MP4ERROR: MP4WriteCountedString: Result too large
the error occurs in the following function:
void MP4File::WriteCountedString(char* string,
u_int8_t charSize, bool allowExpandedCount)
this writes out a string of bytes. the above error is generated when
allowExpandedCount=false and the charSize (string length) exceeds 255
bytes.
i modified the function to dump the string:
custom.avi(custom mpeg qmatrix): charSize=332 bytes: (VOL=171 bytes)
data:application/mpeg4-od-au;base64,AYCAgVcBgICBUgUfA4CAgUsAAQAEgICBPSARAGBhABXrQAAMNSsFgICBKwAAAbADAAABtQsAAAEAAAABIAAGxABnDEwQgFMIEBAQEBAQEBAQERAREBESERISERIVExQVFBMVGBYWGBgWFhgZGRseGxkZHR8jIx8dGiksKSQvNjYvQUZBWFhzigoKCgoKCgoKCgqKCooKi4sLCwsLjQwMDQwMDQ8NjY8PDY2PEA+REpEPkBITFhYTEhYZnBmWHaIiHaisKLa2yGMAAAGyWHZpRDAwMDh/AAaAgIABAA==
default.avi(default mpeg qmatrix): charSize=160 bytes: (VOL=43 bytes)
data:application/mpeg4-od-au;base64,AYCAgFcBgICAUgUfA4CAgEsAAQAEgICAPSARAFZ4ABjMAAANbdsFgICAKwAAAbADAAABtQsAAAEAAAABIAAGxABnDEwQgFJjAAABslh2aUQwMDA4fwAGgICAAQA=
both .avis are of similar size; so it seems the charSize is relative to
the length of the VOL. thus large VOLs cause mp4creator to fail.
-- pete; life is like a box of ammo