I'm trying to convert a WMV file to MPEG-2 but immediately on hitting submit, ffmpegx progress app stops the conversion and throws the error:

Could not open movie
**ERROR: [yuvscaler] Couldn't read YUV4MPEG header!
**ERROR: [mpeg2enc] Could not read YUV4MPEG header: system error (failed read/write)


This movie plays fine in media player and VLC