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lavf/img2doc: document options

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This commit is contained in:
Stefano Sabatini 2012-08-04 13:04:40 +02:00
parent b5c7318bd7
commit b0d23ae208
2 changed files with 30 additions and 7 deletions
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27
doc/demuxers.texi
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@ -34,8 +34,9 @@ specified in the pattern with the string "%%".
If the pattern contains "%d" or "%0@var{N}d", the first filename of
the file list specified by the pattern must contain a number
inclusively contained between 0 and 4, all the following numbers must
be sequential. This limitation may be hopefully fixed.
inclusively contained between @var{start_number} and
@var{start_number}+4, all the following numbers must be
sequential.
The pattern may contain a suffix which is used to automatically
determine the format of the images contained in the files.
@ -49,6 +50,23 @@ sequence of filenames of the form @file{i%m%g-1.jpg},
The size, the pixel format, and the format of each image must be the
same for all the files in the sequence.
This demuxer accepts the following options:
@table @option
@item framerate
Set the framerate for the video stream. It defaults to 25.
@item loop
If set to 1, loop over the input. Default value is 0.
@item pixel_format
Set the pixel format of the images to read. If not specified the pixel
format is guessed from the first image file in the sequence.
@item start_number
Set the index of the file matched by the image file pattern to start
to read from. Default value is 0.
@item video_size
Set the video size of the images to read. If not specified the video
size is guessed from the first image file in the sequence.
@end table
The following example shows how to use @command{ffmpeg} for creating a
video from the images in the file sequence @file{img-001.jpeg},
@file{img-002.jpeg}, ..., assuming an input frame rate of 10 frames per
@ -57,6 +75,11 @@ second:
ffmpeg -i 'img-%03d.jpeg' -r 10 out.mkv
@end example
As above, but start by reading from a file with index 100 in the sequence:
@example
ffmpeg -start_number 100 -i 'img-%03d.jpeg' -r 10 out.mkv
@end example
Note that the pattern must not necessarily contain "%d" or
"%0@var{N}d", for example to convert a single image file
@file{img.jpeg} you can employ the command:

10
libavformat/img2dec.c
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@ -387,11 +387,11 @@ static int read_close(struct AVFormatContext* s1)
#define OFFSET(x) offsetof(VideoDemuxData, x)
#define DEC AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
{ "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = "25"}, 0, 0, DEC },
{ "loop", "", OFFSET(loop), AV_OPT_TYPE_INT, {.dbl = 0}, 0, 1, DEC },
{ "pixel_format", "", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
{ "start_number", "first number in the sequence", OFFSET(start_number), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, DEC },
{ "video_size", "", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
{ "framerate", "set the video framerate", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = "25"}, 0, 0, DEC },
{ "loop", "force loop over input file sequence", OFFSET(loop), AV_OPT_TYPE_INT, {.dbl = 0}, 0, 1, DEC },
{ "pixel_format", "set video pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
{ "start_number", "set first number in the sequence", OFFSET(start_number), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, DEC },
{ "video_size", "set video size", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
{ NULL },
};