All of these converted, but Premiere Pro only loads the audio. I use Ctrl-I to import the videos, and they come up as waveforms, and can only be placed on audio tracks.
These examples use avconv, but I also have ffmpeg, and don't really care which as long as it works :-)
avconv -i v1raw.AVI -c:a copy -c:v mpeg2video v1conv.mpeg avconv -i v1raw.AVI -c:a copy -c:v mpeg2video v1conv.avi avconv -i v1raw.AVI -c:a copy -c:v mpeg4 v1conv.m4v avconv -i v1conv.avi -c:a copy -c:v copy v1conv_copy.mpeg
Here's the data for my input file (incase it helps).
Input #0, avi, from 'v1raw.AVI': Duration: 00:05:28.53, start: 0.000000, bitrate: 9592 kb/s Stream #0.0: Video: h264 (Main), yuv420p, 1920x1080, 30 fps, 30 tbr, 30 tbn, 60 tbc Stream #0.1: Audio: adpcm_ms, 44100 Hz, 1 channels, s16, 176 kb/s
And my available video encoding formats from avconv.
a64multi, a64multi5, asv1, asv2, bmp, cljr, dnxhd, dpx, dvvideo, ffv1, ffvhuff, flashsv, flv, gif, h261, h263, h263p, huffyuv, jpegls, libdirac, libschroedinger, libtheora, libvpx, libx264, libxvid, ljpeg, mjpeg, mpeg1video, mpeg2video, mpeg4, msmpeg4, msmpeg4v2, pam, pbm, pcx, pgm, pgmyuv, png, ppm, qtrle, rawvideo, roqvideo, rv10, rv20, sgi, snow, svq1
I'd be happy to post anything else that has the slightest chance of helping.