This adds the capability to start counting file number from an arbitrary
integer.
This includes a few lines of trivial code from FFmpeg codebase.
---
libavformat/img2enc.c | 20 ++++++++++++++++++--
1 file changed, 18 insertions(+), 2 deletions(-)
diff --git a/libavformat/img2enc.c b/libavformat/img2enc.c
index c825c2b..77f72ff 100644
--- a/libavformat/img2enc.c
+++ b/libavformat/img2enc.c
@@ -26,8 +26,10 @@
#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
+#include "libavutil/opt.h"
typedef struct {
+ const AVClass *class; /**< Class for private options. */
int img_number;
int is_pipe;
char path[1024];
@@ -37,7 +39,6 @@ static int write_header(AVFormatContext *s)
{
VideoMuxData *img = s->priv_data;
- img->img_number = 1;
av_strlcpy(img->path, s->filename, sizeof(img->path));
/* find format */
@@ -124,7 +125,21 @@ static int write_packet(AVFormatContext *s, AVPacket *pkt)
return 0;
}
+#define OFFSET(x) offsetof(VideoMuxData, x)
+#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, {.dbl = 1}, 1, INT_MAX, ENC },
+ { NULL },
+};
+
#if CONFIG_IMAGE2_MUXER
+static const AVClass img2mux_class = {
+ .class_name = "image2 muxer",
+ .item_name = av_default_item_name,
+ .option = muxoptions,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
AVOutputFormat ff_image2_muxer = {
.name = "image2",
.long_name = NULL_IF_CONFIG_SMALL("image2 sequence"),
@@ -135,7 +150,8 @@ AVOutputFormat ff_image2_muxer = {
.video_codec = CODEC_ID_MJPEG,
.write_header = write_header,
.write_packet = write_packet,
- .flags = AVFMT_NOTIMESTAMPS | AVFMT_NODIMENSIONS | AVFMT_NOFILE
+ .flags = AVFMT_NOTIMESTAMPS | AVFMT_NODIMENSIONS | AVFMT_NOFILE,
+ .priv_class = &img2mux_class
};
#endif
#if CONFIG_IMAGE2PIPE_MUXER
--
1.7.9.5
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