After installing RockBox on my Sansa e200 series player, I experienced the same issue. I found the files needed to change the settings for SanDisk Media Converter to convert photos and videos for the RockBox. Almost all the info you needed was in the RockBox manual and in the files found in the
\Program Files\SanDisk\Sansa Media Converter\Profiles folder (and a little more in Wikipedia

). The
AMC_Common.apr file gave the file format details. You just needed to update the
SanDisk_E200_MSC.apr file to get the changes made.
Backup the original file by renaming it to a .OLD extension, then copy this code into a new
SanDisk_E200_MSC.apr file (long):
[DEVICE]
HID=VID_0781&PID_7421
PhotoFolder=Photo
AudioFolder=Audio
VideoFolder=Video
DeviceIcon=hcata_e200
EnableAlbum=1
DefaultAlbum=My Album
[TRANSCODE]
FilenameLength=1000
FilenameExclude=
FilenameRenameCap=
UniqueFilename=0
PromptCompatible=0
CheckPhotoCompatible=1
CheckAudioCompatible=1
CheckVideoCompatible=1
UseArcAviWriter=0
ArcAviWriterMode=2
ArcAviWriterModeDesc=AVI_TIME(0),AVI_SAMPLE(1),AVI_CONTROL(2)
SplitTime=600
[OUTPUT_FORMAT]
PhotoFmts=Jpeg File(JPG),Bitmap File(BMP)
DefPhotoFmt=JPG
PhotoSaveMode=BMP(2),JPG(4)
AudioFmts=Mp3 File(MP3)
DefAudioFmt=MP3
VideoFmts=Motion JPEG B(MOV),MPEG1(MPG)
DefVideoFmt=MPG
VideoSaveMode=AVI(256),MPG(257),WMV(258),MOV(259),ASF(261)
[OPTIMIZE]
PhotoFmt=JPG
PhotoSize=176x220
PhotoQuality=100
AudioFmt=
AudioBits=
AudioSmpBits=
AudioChnl=
VideoFmt=MPG
Resolution=220x176
VideoEncoder=MPEG1
AudioEncoder=ArcSoft MPEG2Audio Encoder
VideoBitrate=1000
AudioBitrate=
AudioSmplrate=11025
VideoFps=25.00
RotateDegree=
[BMP]
FileExtName=BMP
SaveMode=2
Resolutions=320x240,640x480,720x480,800x600,1024x768
DefResolution=640x480
[JPG]
FileExtName=JPG
SaveMode=4
Resolutions=320x240,640x480,720x480,800x600,1024x768
DefResolution=640x480
[MOV]
FileExtName=MOV
SaveMode=259
VideoEncodes=MotionJPEGB Codec
DefaultVideoEncode=MotionJPEGB Codec
AudioEncodes=UnCompressed,16-bit big endian,16-bit little endian,32-bit floating point,64-bit floating point,24-bit integer,32-bit integer,MACE 3:1,MACE 6:1,IMA 4:1,.Law 2:1,aLaw 2:1
DefaultAudioEncoder=24-bit integer
Fps=15.00,20.00,24.00,25.00,29.97
DefaultFps=15.00
AudioBitrate=
DefaultAudioBitrate=
VideoBitrate=Lossless Quality(100),Max Quality(100),High Quatliy(75),Normal Quality(50),Low Quatliy(25),Min Quatliy(0)
DefaultVideoBitrate=4
AudioSmplrate=
DefaultAudioSmplrate=44100
Resolutions=208x160
DefaultResolution=208x160
[MPG]
FileExtName=MPG
SaveMode=257
VideoEncodes=MPEG1
DefaultVideoEncode=MPEG1
AudioEncodes=ArcSoft MP3 Encoder,ArcSoft MPEG-1 Layer-2(ArcSoft MPEG2Audio Encoder)
DefaultAudioEncoder=ArcSoft MPEG2Audio Encoder
Fps=24.00,25.00,29.97
DefaultFps=25.00
AudioBitrate=96KB(96),128KB(128),192KB(192)
DefaultAudioBitrate=128
VideoBitrate=500KB(500),1.0MB(1000),1.5MB(1500),2.0MB(2000),2.5MB(2500),3.0MB(3000)
DefaultVideoBitrate=1000
AudioSmplrate=
DefaultAudioSmplrate=
Resolutions=320x240,352x240,352x288,720x480,720x576,VGA(640x480)
DefaultResolution=352x288
Run Sansa Media Converter and your videos will be in MPEG1 format with a MPEG2 audio in a resolution of 176x220. Your photos will also be in the right JPG format for the included RockBox viewer, but may not always show full screen.
Hope this helps!
dattguy