Add support for reading YUV4MPEG2 files to ivfenc.
A large collection of example files may be found at http://media.xiph.org/video/derf/ This also fixes a bug in ivfenc for uncompressed IVF input, which previously appeared not to skip past the file header the second time it opened the file. I don't actually have an IVF file with which to test this fix, however. Change-Id: Id69a1e11a3fa16c4a4fa8944e880bcea090cd52b
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