[FFmpeg-user] New and question with -i option

[Gyan Doshi]

On 09-07-2020 02:50 pm, François-Marie BILLARD wrote:
> Hello,
>
> i'm new on this list and would use ffmpeg for making a video from 
> pictures.
>
> I have used this command line; with 54 pictures from DSC_0527.JPG :
>
>> ffmpeg -f image2 -i DSC_05%2d.JPG -start_number 0527 -r 12 -vcodec 
>> mpeg4 -b 15000k ouverture_four.mp4
>>
>
> i have this error, when i launch the command in the directory with the 
> pictures :
>
>> [image2 @ 0x55b7146af8c0] Could find no file with path 
>> 'DSC_05%2d.JPG' and index in the range 0-4
>> DSC_05%2d.JPG: No such file or directory

It should be

     ffmpeg -f image2 -start_number 27 -i DSC_05%2d.JPG -r 12 -vcodec 
mpeg4 -b 15000k ouverture_four.mp4

`-start_number` qualifies the input so it belongs before the 
corresponding input `-i`

  In ` DSC_05%2d`, 05 is a literal and so not recognized as part of the 
numbering pattern.

Also, `-r 12` will cause ffmpeg to drop 13 out of every 25 images, since 
ffmpeg assumes a default frame rate of 25 for image sequences.
You can override it by adding -framerate 12 for this input. (And then 
drop -r 12)

     ffmpeg -f image2 -start_number 27 -framerate 12 -i DSC_05%2d.JPG 
-c:v mpeg4 -b:v 15000k ouverture_four.mp4


Gyan