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img2enc: add an option for overwriting one file with subsequent images 

Based on a patch by Michael Niedermayer <michaelni@gmx.at>.
This commit is contained in:
Anton Khirnov 2013-04-04 22:57:58 +02:00
parent ac9362c5d9
commit 9e6b5e61a0
2 changed files with 12 additions and 2 deletions
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6
doc/muxers.texi
View File

@ -171,6 +171,12 @@ avconv -i in.avi -f image2 -frames:v 1 img.jpeg
@table @option
@item -start_number @var{number}
Start the sequence from @var{number}.
@item -update @var{number}
If @var{number} is nonzero, the filename will always be interpreted as just a
filename, not a pattern, and this file will be continuously overwritten with new
images.
@end table
@section MOV/MP4/ISMV

8
libavformat/img2enc.c
View File

@ -33,6 +33,7 @@ typedef struct {
int img_number;
int is_pipe;
char path[1024];
int update;
} VideoMuxData;
static int write_header(AVFormatContext *s)
@ -59,8 +60,10 @@ static int write_packet(AVFormatContext *s, AVPacket *pkt)
int i;
if (!img->is_pipe) {
if (av_get_frame_filename(filename, sizeof(filename),
img->path, img->img_number) < 0 && img->img_number > 1) {
if (img->update) {
av_strlcpy(filename, img->path, sizeof(filename));
} else if (av_get_frame_filename(filename, sizeof(filename), img->path, img->img_number) < 0 &&
img->img_number > 1) {
av_log(s, AV_LOG_ERROR,
"Could not get frame filename number %d from pattern '%s'\n",
img->img_number, img->path);
@ -128,6 +131,7 @@ error:
#define ENC AV_OPT_FLAG_ENCODING_PARAM
static const AVOption muxoptions[] = {
{ "start_number", "first number in the sequence", OFFSET(img_number), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, INT_MAX, ENC },
{ "update", "continuously overwrite one file", OFFSET(update), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, ENC },
{ NULL },
};