The original clip is 46 minutes : 25 seconds in duration and contained in a 8.38 GB file contained in iMovie.
DIMENSIONS: 960 x 540
CODECS: Apple Itnermediate Codec, Linear PCM, Timecode
AUDIO CHANNELS: 2
TOTAL BIT RATE: 24,037
The MP4 file is 507.6 MB.
DIMENSIONS: 1280 x 720
CODECS: H.264, AAC, Text
AUDIO CHANNELS: 2
TOTAL BIT RATE: 1448
When I originally created the Custom Video Export Profile, I believe I used the following settings (although I don't have these documented to confirm):
VIDEO
FORMAT: MPEG-4 Player
SIZE: Automatic
ASPECT RATIO: Automatic
OVERSCAN: Automatic
FRAME RATE: 29.97
DATA RATE: Custom - 900 kbps
AUDIO
FORMAT: MPEG-4 Audio
SAMPLE RATE: 44100
CHANNELS: Stereo
DATA RATE: 128000
NOTE: I am unable to change the DATA RATE. It's current set at 1328 kbps. The drop down menu appears and a cursor is available to manually set the data rate but neither entry is accepted.
Thanks for your time and expertise.