A:AnswerI had the same issue. So I tried with a different card and it worked. As you said when you use the card in different camera it changes a way of saving data on the card. If you want to use the card again format it while inserting card slot.
A:AnswerYes but you need a switcher or a converter. It is not web streaming ready directly Maybe canon software allows for web streaming . So double check with canon.
A:AnswerIt doesn't come with one or a plug for one. There is plug for a microphone thou but it has to have it's own power. I do use a light with it indoors or low light but I attach the camera and the light to a Video Action Stabilizing Handle Grip Handheld Stabilizer with Hot-Shoe Mount which you can get at the Big A store or Best Buy.
A:AnswerIt depends. In my use case, it will work for hours (more than 3), I do not write to the SD card. I take the video out to a video switcher. Otherwise, it will time out after an hour or so.