Trouble converting to DV

[Skraut]

Sorry if this has been asked before. I tried looking, but it's impossible to search for DV.

Whenever I try and convert a file to DV with FFMpegX, it starts, and the finishes instantly with the following error.

Encoding started on Tue Dec 19 12:59:53 EST 2006
Input #0, mov,mp4,m4a,3gp, from '/Users/username/Documents/videofile.mp4':
Duration: 00:33:06.1, start: 0.000000, bitrate: 1004 kb/s
Stream #0.0: Video: h264, 448x336, 59.94 fps
Stream #0.1: Audio: mpeg4aac, 48000 Hz, stereo
Output #0, dv, to '/Users/username/Documents/videofile.mp4.ff.dv':
Stream #0.0: Video: dvvideo, 720x480, 29.97 fps, q=2-15, 25000 kb/s
Stream #0.1: Audio: pcm_s16le, 48000 Hz, stereo, 1536 kb/s
Stream mapping:
Stream #0.0 -> #0.0
Stream #0.1 -> #0.1
[h264 @ 0x381324]illegal aspect ratio
[h264 @ 0x381324]top block unavailable for requested intra4x4 mode -1 at 0 0
[h264 @ 0x381324]error while decoding MB 0 0
[h264 @ 0x381324]top block unavailable for requested intra mode at 0 196
[h264 @ 0x381324]error while decoding MB 0 196
[h264 @ 0x381324]top block unavailable for requested intra4x4 mode -1 at 0 392
[h264 @ 0x381324]error while decoding MB 0 392
[h264 @ 0x381324]concealing 2147483647 errors
[h264 @ 0x381324]top block unavailable for requested intra mode at 0 0
[h264 @ 0x381324]error while decoding MB 0 0
[h264 @ 0x381324]top block unavailable for requested intra mode at 0 196
[h264 @ 0x381324]error while decoding MB 0 196
[h264 @ 0x381324]top block unavailable for requested intra mode at 0 392
[h264 @ 0x381324]error while decoding MB 0 392
[h264 @ 0x381324]illegal short term buffer state detected
[h264 @ 0x381324]concealing 2147483647 errors

I have been able to convert this file to a DVD, and then use another program to convert from DVD to DV, but the whole point of going to DV is lossless compression, and converting it to another lossy in between just muddles the image even more.

Thanks for your help.

[Case]

the whole point of going to DV is lossless compression

DV uses lossy DCT (discrete cosine transform) intraframe compression at 25 Mbit/s for video, or 1/5 of uncompressed video. In transcoding from format X to DV you lose some quality; some compression artifacts and color accuracy.