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Premiere Pro 1.5 has served me well editing the footage from my MiniDV tape camcorder. However now I have a new camera (in my smartphone) and the videos from that won't even play on my editing PC (except perhaps in VLC). The video files from the smartphone look a bit like this:

ExifTool Version Number         : 11.93
File Name                       : vid1.mp4
Directory                       : E:/
File Size                       : 43 MB
File Modification Date/Time     : 2020:04:19 18:31:32+01:00
File Access Date/Time           : 2020:04:21 00:00:00+01:00
File Creation Date/Time         : 2020:04:20 20:54:56+01:00
File Permissions                : rw-rw-rw-
File Type                       : MP4
File Type Extension             : mp4
MIME Type                       : video/mp4
Major Brand                     : MP4 v2 [ISO 14496-14]
Minor Version                   : 0.0.0
Compatible Brands               : isom, mp42
Movie Header Version            : 0
Create Date                     : 2020:04:19 17:31:32
Modify Date                     : 2020:04:19 17:31:32
Time Scale                      : 1000
Duration                        : 20.71 s
Android Version                 : 9
Com Android Manufacturer        : motorola
Com Android Model               : moto g(6)
Image Width                     : 1920
Image Height                    : 1080
Graphics Mode                   : srcCopy
Op Color                        : 0 0 0
Compressor ID                   : avc1
Source Image Width              : 1920
Source Image Height             : 1080
X Resolution                    : 72
Y Resolution                    : 72
Bit Depth                       : 24
Pixel Aspect Ratio              : 65536:65536
Color Representation            : nclx 1 1 1
Video Frame Rate                : 29.985
Matrix Structure                : 1 0 0 0 1 0 0 0 1
Media Header Version            : 0
Media Create Date               : 2020:04:19 17:31:32
Media Modify Date               : 2020:04:19 17:31:32
Media Time Scale                : 48000
Media Duration                  : 20.68 s
Handler Type                    : Audio Track
Handler Description             : SoundHandle
Balance                         : 0
Audio Format                    : mp4a
Audio Channels                  : 2
Audio Bits Per Sample           : 16
Audio Sample Rate               : 48000
Media Data Size                 : 44457807
Media Data Offset               : 405275
Image Size                      : 1920x1080
Megapixels                      : 2.1
Avg Bitrate                     : 17.2 Mbps
Rotation                        : 0

Premiere Pro 1.5 would not import the file at all, so I tried Premiere Pro CS3 which imported only audio. A quick Google suggested that changing the container from .mp4 to .mov might make Premiere accept the file without re-encoding and losing quality so I downloaded ffmpeg and (I think) did just that. The resulting .mov file looks a bit like this:

ExifTool Version Number         : 11.93
File Name                       : quicktime.mov
Directory                       : E:/
File Size                       : 42 MB
File Modification Date/Time     : 2020:04:21 21:18:30+01:00
File Access Date/Time           : 2020:04:21 00:00:00+01:00
File Creation Date/Time         : 2020:04:21 21:18:22+01:00
File Permissions                : rw-rw-rw-
File Type                       : MOV
File Type Extension             : mov
MIME Type                       : video/quicktime
Major Brand                     : Apple QuickTime (.MOV/QT)
Minor Version                   : 0.2.0
Compatible Brands               : qt
Media Data Size                 : 44457807
Media Data Offset               : 36
Movie Header Version            : 0
Time Scale                      : 1000
Duration                        : 20.71 s
Track ID                        : 1
Track Duration                  : 20.71 s
Track Layer                     : 0
Track Volume                    : 0.00%
Image Width                     : 1920
Image Height                    : 1080
Graphics Mode                   : srcCopy
Op Color                        : 0 0 0
Compressor ID                   : avc1
Vendor ID                       : FFmpeg
Source Image Width              : 1920
Source Image Height             : 1080
X Resolution                    : 72
Y Resolution                    : 72
Bit Depth                       : 24
Pixel Aspect Ratio              : 1:1
Video Frame Rate                : 29.985
Matrix Structure                : 1 0 0 0 1 0 0 0 1
Media Header Version            : 0
Media Create Date               : 0000:00:00 00:00:00
Media Modify Date               : 0000:00:00 00:00:00
Media Time Scale                : 48000
Media Duration                  : 20.68 s
Balance                         : 0
Handler Class                   : Data Handler
Handler Type                    : URL
Handler Description             : DataHandler
Audio Format                    : mp4a
Audio Bits Per Sample           : 16
Audio Sample Rate               : 48000
Purchase File Format            : mp4a
Layout Flags                    : Stereo
Audio Channels                  : 2
Software Version                : Lavf58.42.100
Image Size                      : 1920x1080
Megapixels                      : 2.1
Avg Bitrate                     : 17.2 Mbps
Rotation                        : 0

Premiere Pro does import this file, but the video is blank (either solid black screen or a solid white screen, I forget where I saw what). It was only at this point that I tried to play the files in QuickTime Player and I didn't seem to get a picture with any version of the file (the .mov had the solid white screen in QuickTime if I recall correctly). Just as a test, I installed QuickTime Player on my Windows 7 laptop (which could already play the files in Windows Media Player) and it worked fine on the laptop. I guess this means I need to install the avc1 codec on my desktop PC so that the QuickTime Player there can play it correctly (I think if QuickTime copes then so will Premiere). The trouble is I am not sure where to obtain codecs for Windows XP; I have found a Microsoft download for WM9Codecs.exe, but they don't list what codecs are included. Is it just the Windows Media (WMV/WMA) formats (which I assume I already have) or does it include the one I'm missing?

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