getVideoField: when seeking forward isn't possible, try reading and discarding #473
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When SourceVideo::getVideoField is reading video from an unseekable source, like a pipe, trying to seek forward to a field later in the file would fail -- which, for example, means you couldn't use "ld-chroma-decoder -s" when input was from a pipe.
Make it try to read and discard data instead when seeking forward fails. If reading fails or hits the end of the input stream, it'll report an error as before.