[FFmpeg-user] how to detect changes between frames - for a very simple AVI video where most of the frames are exactly identical (just a sporadically updating computer screen capture)

belcampo belcampo at zonnet.nl
Thu Oct 27 10:58:12 CEST 2011

On 10/27/2011 10:35 AM, Peter B. wrote:
> belcampo wrote:
>> On 10/27/2011 02:19 AM, Stefan Scott Alexander wrote:
>>> ffmpeg does lots of stuff, so I basically am hoping someone can point
>>> me to
>>> the commands which allow frame-by-frame comparisons,
>>> plus outputting timestamps.
>> Maybe following this thread and following the suggestions and a
>> mentioned script you'll find something that will give you the right
>> direction.
>> http://ffmpeg-users.933282.n4.nabble.com/Creating-a-list-of-I-frames-td2299316.html
> But wouldn't detecting I-frames only be helpful for his cause, if the
> I-frames are threshold-positioned, which would have to be configured
> during encoding?
It depends, as always, if the source is encoded with h264 and 'long-GOP' 
then I-frames would be at the threshold-position, but if a fixed short 
gop is defined that won't help much in finding those places/frame#
> ...or am I overlooking something?
> Pb
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