I need to compress some videos about laboratory experiments which contain motions of some objects.
Since in analysis time intervalls on the video are needed as accurate as the camera captured them, it is important that the conversation doesn't introduce any time stretching, shifting or any other inaccuraries.
I am using ffmpeg (or avconv) for conversion and vp8 or h264 as video codec. Audo is irrelevant in my case.
Since I am not a video expert, my first question is, if there are any problems regarding time accuracy to expect at all.
If so, my second question is, what I should have in mind to bypass those problems when compressing a video.
To make it more concrete, my first attempts where:
avconv -i input{.MP4,webm}
and
ffmpeg -vcodec h264 -i input{.MP4,mp4}
