Adobe Media Encoder converts only audio

I am using Adobe Media Encoder to convert .mov files (to f4v). Some of the videos are converted fine, but some end up with no video, only audio. Interestingly, the ones that have audio only were recorded with the camera (an iphone) held vertically. That shouldn't make a difference, but here it seems to. Any suggestions?

I am using Adobe Media Encoder to convert .mov files (to f4v). Some of the videos are converted fine, but some end up with no video, only audio. Interestingly, the ones that have audio only were recorded with the camera (an iphone) held vertically. That shouldn't make a difference, but here it seems to. Any suggestions?

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    File size                        : 1.52 GiB
    Duration                         : 17mn 43s
    Overall bit rate                 : 12.2 Mbps
    Encoded date                     : UTC 2011-06-27 20:18:32
    Tagged date                      : UTC 2011-06-28 19:41:34
    Writing library                  : Apple QuickTime
    Video
    ID                               : 1
    Format                           : AVC
    Format/Info                      : Advanced Video Codec
    Format profile                   : [email protected]
    Format settings, CABAC           : Yes
    Format settings, ReFrames        : 4 frames
    Format settings, GOP             : M=1, N=8
    Codec ID                         : avc1
    Codec ID/Info                    : Advanced Video Coding
    Duration                         : 17mn 43s
    Bit rate mode                    : Variable
    Bit rate                         : 12.1 Mbps
    Maximum bit rate                 : 12.1 Mbps
    Width                            : 1 280 pixels
    Height                           : 960 pixels
    Display aspect ratio             : 4:3
    Frame rate mode                  : Constant
    Frame rate                       : 29.970 fps
    Color space                      : YUV
    Chroma subsampling               : 4:2:0
    Bit depth                        : 8 bits
    Scan type                        : Progressive
    Bits/(Pixel*Frame)               : 0.329
    Stream size                      : 1.50 GiB (99%)
    Language                         : English
    Encoded date                     : UTC 2011-06-27 20:18:27
    Tagged date                      : UTC 2011-06-27 20:20:17
    Material_Duration                : 1063262
    Material_StreamSize              : 1609122968
    Material_FrameCount              : 31866
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    Format                           : AAC
    Format/Info                      : Advanced Audio Codec
    Format profile                   : LC
    Codec ID                         : 40
    Duration                         : 17mn 43s
    Bit rate mode                    : Constant
    Bit rate                         : 128 Kbps
    Channel(s)                       : 2 channels
    Channel positions                : Front: L R
    Sampling rate                    : 48.0 KHz
    Compression mode                 : Lossy
    Stream size                      : 16.2 MiB (1%)
    Language                         : English
    Encoded date                     : UTC 2011-06-27 20:18:27
    Tagged date                      : UTC 2011-06-27 20:20:17
    Material_Duration                : 1063019
    Material_StreamSize              : 17008291

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