FFmpeg bombing on second pass

[DeusExMachina]

I have a video that I am encoding using ffmeg two pass. It makes it through the first pass just fine, generating a decent quality video. When it tries to begin the second pass, it zeros out the file generated by the first pass, then bombs out saying "Error while opening codec for stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height."
The file was a 336x284 PAL file with P3 44100 audio, 127 kbs.
I set it to encode at:
900 Kbs 336x284 letterboxed to 352x288
128 kbs AC3 48000 stereo VBR
high qual/4 motion vectors/2 pass/ trellis quant
with Qmin=Qmax=2 (for VBR),
saving elementary streams.

Any idea why it fails the 2nd pass?

[major]

Which was the codec used? (XviD, etc)

Also please email me to major4@mac.com with the complete process output.

[DeusExMachina]

Also, sometimes it fails on the first pass with the same process info:

Encoding started on Mon Jan 3 05:21:13 EST 2005
Input #0, avi, from '/Volumes/Untitled/Martial_arts/Done/Mind body and kick ass moves/mind.body.and.kick.ass.moves.1x01.xvid.ws.pdtv-wlw.avi':
Duration: 00:28:19.9, start: 0.000000, bitrate: 1157 kb/s
Stream #0.0: Video: mpeg4, 640x360, 25.00 fps
Stream #0.1: Audio: mp3, 44100 Hz, stereo, 161 kb/s
Output #0, vob, to '/Volumes/Untitled/Martial_arts/Done/Mind body and kick ass moves/mind.body.and.kick.ass.moves.1x01.xvid.ws.pdtv-wlw.avi.ff':
Stream #0.0: Video: mpeg2video (hq), 720x576, 25.00 fps, q=2-2, pass 1, 2081 kb/s
Stream #0.1: Audio: ac3, 48000 Hz, stereo, 128 kb/s
Stream mapping:
Stream #0.0 -> #0.0
Stream #0.1 -> #0.1
[mpeg2video @ 0x38430c]4MV not supported by codec
Error while opening codec for stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height

[major]

The 4mv option is not supported for mpeg-2, but only for mpeg-4.

[DeusExMachina]

The thing is, I am not clear what I am doing that sets that option. Sometimes, the encode works, other times, with the exact same settings, it does not. When it does not, the saved file, instead of ending in .ff.mpg ends simply in .ff. Something is causing it to fail to append the correct full extension. It is odd.

[major]

You should keep track of the process outputs and settings of the odds encodings, and email them to me to major4@mac.com for inspection.

[DeusExMachina]

well, the above is one of the process outputs. Not sure what settings I was using at that time, but I can run another batch through after my current one and see.

[major]

As said, the problem of the above output was the option "4mv", it should have worked by disabling it.