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Error: video is corrupted or generated in an unwanted format
In some cases you may realise that a video that is visually in 16/9 format (1024x576 for example) is in fact only a 4/3 video (720x576). This is due to the fact that the file has a L/H ratio in anamorphic type pixels, thus each pixel isn't square but rectangular. In general, you may notice this when opening the file with Quicktime and then VLC, as these programs don't interpret it in the same way.
The problem is that when the video is converted using the VOD tool, it is in square pixels, finally with a 4/3 ratio, even if the encoding is set for 16/9.
Define an encoding rule with a format that "forces the resolution" (dropdown menu under "format") as well as the 16/9 dimensions — 640x360.
The basic conversions use the Letterbox mode, which means that the videos you send in 4/3 will remain in 4/3 even if the requested dimensions are 16/9. If you adjust this setting to the "Force resolution" mode and then specify 16/9 dimensions, you will in the end obtain a file with the desired dimensions.
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