The movieTime accuracy when used with WMVs?

I have a simple project that I'm pulling my hair out over. I have a customer provided WMV, 17 minutes long, 720 x 405 *. The customer wants 8 chapter marks that users can click to navigate the video, not a big deal, right? Home video gave us about 0.5 seconds (15 images) of transition between the chapters that we could use as a target. The problem is, I couldn't find a number of movieTime aimed at a frame within this range, either I caught a few videos of the front section, or I cut myself in the audio for the next chapter. MovieTime by small steps of change seems to have no effect, then suddenly frame target travel a lot... it sounded to me as a matter of key frame... I thought that maybe we can target only the key frames and as Prime Minister default keyframe interval is 15 images (the size of our transition) maybe there is no keyframes in transition where we need. I got home video spend three hours, increasing the duration of transition between the chapters to 1 second (30 fps) so there should be at least two keyframes for each transition... better, but I can't always provide a millisecond time that works for all machines. On 6 different machines, half exactly seek to the specified image; others are off by as much as one second. Performance does not appear to be a problem, one of our oldest and slowest machines is the most accurate. I ask home video to give me a second target two transition, but it's another 3 hours and frankly, if it doesn't work after that, I'll have a lot of people angry on the phone.

Video home cropped some undesirable material outside doing the non-standard image size.

Well, we've reversed direction and decided to re - encode the video with a much lower keyframe interval and fixed it. Lowering of the interval of keyframe from 5 seconds to 1 second (the option less available vacuuming) gave us the accuracy we needed to effectively target amid a transition 1 second without picking up video or audio from both ends. The cost was a 14% increase in file size. Thus, greeting take: time ask precision is made by the number of keyframes and while some machines can effectively target the intermediate images without showing the video artifacts, most will not.

Tags: Director

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