[FFmpeg-devel] [Patch] improve section 3.2 of the faq

[John Van Sickle]

On Sun, Jan 10, 2010 at 5:57 AM, Stefano Sabatini
<stefano.sabatini-lala at poste.it> wrote:
> On date Friday 2010-01-08 05:31:37 -0500, John Van Sickle encoded:
>> Hi,
>>
>> The attached patch improves section 3.2 of the faq by providing more
>> useful examples and a simple batch
>> script to rename images to a numerical sequence. I hope that's not
>> beyond the scope of the faq as it has
>> helped a few folks in #ffmpeg.
>
> I have only a problem with this patch, that it duplicates some content
> currently present in ffmpeg-doc.texi.

Thanks for taking the time to look at it. I've attached a slimmed down
version of the patch that I think addresses your concerns.

> My suggestion is to move all the FAQ documentation regarding the
> ffmpeg commands to the man page (which already contains a sort of
> recipe-book).

ok.

> Also many of those answers are badly outdated, in particular there is
> no mention of presets for performing complex conversions.

Added to my todo list.

>> This also removes an extra line that was introduced with my previous
>> patch. r21033
>
> Fixed.

Thanks.

>
>> Index: doc/faq.texi
>> ===================================================================
>> --- doc/faq.texi ? ? ?(revision 21036)
>> +++ doc/faq.texi ? ? ?(working copy)
>> @@ -126,18 +126,68 @@
>>
>> ?@section How do I encode single pictures into movies?
>>
>> -First, rename your pictures to follow a numerical sequence.
>> -For example, img1.jpg, img2.jpg, img3.jpg,...
>> +ffmpeg uses the C printf syntax to denote a numerical sequence in the filename of images for
>> +input and output. The numerical sequence can start with 0, 1, 2 or 3 and should not contain gaps. If
>> +a gap is present, ffmpeg will interpret the last image before the gap as the end of the sequence.
>> +
>> +Examples:
>> +
>> + at file{img%d.jpg} means the sequence @file{img1.jpg}, @file{img2.jpg}, etc...
>> +
>> + at file{img%03d.jpg} means the sequence @file{img001.jpg}, @file{img002.jpg}, etc...
>> +
>> + at file{img%05d.jpg} means the sequence @file{img00001.jpg}, @file{img00002.jpg}, etc...
>> +
>> +Notice that @samp{%d}, @samp{%03d} and @samp{%05d} are replaced by the image number.
>> +
>> +Now rename your images to follow a numerical sequence, such as img1.jpg, img2.jpg, ...
>> ?Then you may run:
>>
>> ?@example
>> - ?ffmpeg -f image2 -i img%d.jpg /tmp/a.mpg
>> +ffmpeg -f image2 -i img%d.jpg /tmp/a.mpg
>> ?@end example
>>
>> -Notice that @samp{%d} is replaced by the image number.
>> +If you have large number of images to rename, use the following command to ease the burden.
>> +The command symbolically links all files in the current directory that match @code{*jpg} to
>> +the @file{/tmp} directory in the sequence of @file{img001.jpg}, @file{img002.jpg} and so on. If the
>> +filenames are both, upper and lower case, substitute @code{*[JPGjpg]} in place of @code{*jpg}. Also, if
>
> *jpg *JPG
> or
> *[jJ][pP][gG]
>
> If you want to account also for JPEG variants:
> *[jJ][pP]{[eE],}[gG]
>
> or using find+egrep
> find . -type f | egrep -i '.+\.jpe?g'

To keep it short and sweet I cut this out.

> Also all these commands are assuming the sh syntax, maybe this should
> be mentioned somewhere.

Added.

>> +you want to sequence them by oldest modified first, substitute @code{`ls -r -t *jpg`} in place of @code{*jpg}.
>>
>> - at file{img%03d.jpg} means the sequence @file{img001.jpg}, @file{img002.jpg}, etc...
>> + at example
>> +x=1; for i in *jpg; do counter=`printf %03d $x`; ln "$i" /tmp/img"$counter".jpg; x=$(($x+1)); done
>> + at end example
>>
>> +Then run:
>> +
>> + at example
>> +ffmpeg -f image2 -i /tmp/img%03d.jpg /tmp/a.mpg
>> + at end example
>> +
>
> [...]
>
> Thanks for the patch, regards.
> --
> FFmpeg = Friendly & Faboulous Mournful Pitiful Emblematic God
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>

Regards,
John Van Sickle
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