[FFmpeg-user] How to drop every Nth frame?

[Andrey Aleksandrovich]

Oh, thanks so much to all of You.
All is working now.

On 9/24/13, Stefano Sabatini <stefasab at gmail.com> wrote:
> On date Monday 2013-09-23 13:36:25 +0300, Andrey Aleksandrovich wrote:
>> I also try:
>> -filter:v select=mod'(n,372)',crop=in_w-20::11:,scale=320:240
>> but it's the same
>>
>> [Parsed_select_0 @ 0x543d35fc90] [Eval @ 0x3bd5b30b370] Missing ')' or
>> too many args in 'mod(n'
>> [Parsed_select_0 @ 0x543d35fc90] Error while parsing expression 'mod(n'
>> [AVFilterGraph @ 0x543d2dfed0] Error initializing filter 'select' with
>> args 'mod(n'
>
> Please read and understand this:
> http://ffmpeg.org/ffmpeg-filters.html#Notes-on-filtergraph-escaping
>
> In this case you have to choose:
> -filter:v "select='mod(n,372)',..."
> or
> -filter:v "select=mod(n\,372),..."
>
> Also note the embedding double quotes required by the shell.
>
> Also your crop syntax doesn't make sense (you're setting empty
> expressions, please read crop documentation if you have doubts).
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