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mpegts: Provide an option to override the pcr period

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Certain hardware demuxer have specific restrictions for PCR periodicity.
This commit is contained in:
Luca Barbato 2014-06-06 15:59:25 +02:00
parent 3f7e94eccd
commit f121dbd9f7
2 changed files with 7 additions and 1 deletions
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3
doc/muxers.texi
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@ -405,6 +405,9 @@ Set the first PID for PMT (default 0x1000, max 0x1f00).
Set the first PID for data packets (default 0x0100, max 0x0f00).
@item -muxrate @var{number}
Set a constant muxrate (default VBR).
@item -pcr_period @var{numer}
Override the default PCR retransmission time (default 20ms), ignored
if variable muxrate is selected.
@end table
The recognized metadata settings in mpegts muxer are @code{service_provider}

5
libavformat/mpegtsenc.c
View File

@ -79,6 +79,7 @@ typedef struct MpegTSWrite {
int reemit_pat_pmt; // backward compatibility
int pcr_period;
#define MPEGTS_FLAG_REEMIT_PAT_PMT 0x01
#define MPEGTS_FLAG_AAC_LATM 0x02
int flags;
@ -559,7 +560,7 @@ static int mpegts_write_header(AVFormatContext *s)
}
if (ts->mux_rate > 1) {
service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) /
service->pcr_packet_period = (ts->mux_rate * ts->pcr_period) /
(TS_PACKET_SIZE * 8 * 1000);
ts->sdt_packet_period = (ts->mux_rate * SDT_RETRANS_TIME) /
(TS_PACKET_SIZE * 8 * 1000);
@ -1154,6 +1155,8 @@ static const AVOption options[] = {
// backward compatibility
{ "resend_headers", "Reemit PAT/PMT before writing the next packet",
offsetof(MpegTSWrite, reemit_pat_pmt), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
{ "pcr_period", "PCR retransmission time",
offsetof(MpegTSWrite, pcr_period), AV_OPT_TYPE_INT, { .i64 = PCR_RETRANS_TIME }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
{ NULL },
};