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avformat/mpegtsenc: use total_size instead of avio_tell() 

avio_tell() fails to get the amount of data written so far when the
underlying IO context is flushed to segments.

Please test with below command:
$ ./ffmpeg  -f lavfi -i testsrc=duration=100:size=vga -c:v libx264 -x264opts \
  nal-hrd=cbr:force-cfr=1 -b:v 500k -minrate 500k -maxrate 500k -bufsize 500k \
  -f hls -hls_time 10  -hls_ts_options "muxrate=2000000" test%d.ts

$ du -h test*.ts
Before:
2.4M    test00.ts
4.8M    test11.ts
7.2M    test22.ts
9.6M    test33.ts
12M     test44.ts
...

After apply the patch:
 2.4M   test00.ts
 2.4M   test11.ts
 2.4M   test22.ts
 2.4M   test33.ts
 2.4M   test44.ts
...

Reviewed-by: Marton Balint <cus@passwd.hu>
Signed-off-by: Limin Wang <lance.lmwang@gmail.com>
This commit is contained in:
Limin Wang 2020-10-22 09:47:52 +08:00
parent df6ec7f83b
commit f3568a33c9
1 changed files with 9 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
libavformat/mpegtsenc.c
View File

@ -84,6 +84,7 @@ typedef struct MpegTSWrite {
int64_t next_pcr;
int mux_rate; ///< set to 1 when VBR
int pes_payload_size;
int64_t total_size;
int transport_stream_id;
int original_network_id;
@ -830,9 +831,9 @@ invalid:
return 0;
}
static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb)
static int64_t get_pcr(const MpegTSWrite *ts)
{
return av_rescale(avio_tell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
return av_rescale(ts->total_size + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
ts->first_pcr;
}
@ -840,13 +841,14 @@ static void write_packet(AVFormatContext *s, const uint8_t *packet)
{
MpegTSWrite *ts = s->priv_data;
if (ts->m2ts_mode) {
int64_t pcr = get_pcr(s->priv_data, s->pb);
int64_t pcr = get_pcr(s->priv_data);
uint32_t tp_extra_header = pcr % 0x3fffffff;
tp_extra_header = AV_RB32(&tp_extra_header);
avio_write(s->pb, (unsigned char *) &tp_extra_header,
sizeof(tp_extra_header));
}
avio_write(s->pb, packet, TS_PACKET_SIZE);
ts->total_size += TS_PACKET_SIZE;
}
static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
@ -1228,7 +1230,7 @@ static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st)
}
/* PCR coded into 6 bytes */
q += write_pcr_bits(q, get_pcr(ts, s->pb));
q += write_pcr_bits(q, get_pcr(ts));
/* stuffing bytes */
memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
@ -1315,7 +1317,7 @@ static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
while (payload_size > 0) {
int64_t pcr = AV_NOPTS_VALUE;
if (ts->mux_rate > 1)
pcr = get_pcr(ts, s->pb);
pcr = get_pcr(ts);
else if (dts != AV_NOPTS_VALUE)
pcr = (dts - delay) * 300;
@ -1326,7 +1328,7 @@ static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
write_pcr = 0;
if (ts->mux_rate > 1) {
/* Send PCR packets for all PCR streams if needed */
pcr = get_pcr(ts, s->pb);
pcr = get_pcr(ts);
if (pcr >= ts->next_pcr) {
int64_t next_pcr = INT64_MAX;
for (int i = 0; i < s->nb_streams; i++) {
@ -1340,7 +1342,7 @@ static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
ts_st2->last_pcr = FFMAX(pcr - ts_st2->pcr_period, ts_st2->last_pcr + ts_st2->pcr_period);
if (st2 != st) {
mpegts_insert_pcr_only(s, st2);
pcr = get_pcr(ts, s->pb);
pcr = get_pcr(ts);
} else {
write_pcr = 1;
}