@@ -504,6 +504,11 @@ is 1 second. A value of 0 will fill all segments, making pages as large as

 possible. A value of 1 will effectively use 1 packet-per-page in most

 situations, giving a small seek granularity at the cost of additional container

 overhead.

+@item -serial_offset @var{value}

+Serial value from which to set the streams serial number.

+Setting it to different and sufficiently large values ensures that the produced

+ogg files can be safely chained.

+

 @end table

 @section segment

@@ -71,12 +71,15 @@ typedef struct {

     OGGPageList *page_list;

     int pref_size; ///< preferred page size (0 => fill all segments)

     int64_t pref_duration;      ///< preferred page duration (0 => fill all segments)

+    int serial_offset;

 } OGGContext;

 #define OFFSET(x) offsetof(OGGContext, x)

 #define PARAM AV_OPT_FLAG_ENCODING_PARAM

 static const AVOption options[] = {

+    { "serial_offset", "serial number offset",

+        OFFSET(serial_offset), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, PARAM },

     { "pagesize", "preferred page size in bytes (deprecated)",

         OFFSET(pref_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, MAX_PAGE_SIZE, PARAM },

     { "page_duration", "preferred page duration, in microseconds",

@@ -418,7 +421,7 @@ static int ogg_write_header(AVFormatContext *s)

     for (i = 0; i < s->nb_streams; i++) {

         AVStream *st = s->streams[i];

-        unsigned serial_num = i;

+        unsigned serial_num = i + ogg->serial_offset;

         if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)

             if (st->codec->codec_id == AV_CODEC_ID_OPUS)