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fftools/ffmpeg_mux: print latency information in -debug_ts muxing output

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This commit is contained in:
Anton Khirnov 2023-11-24 20:12:52 +01:00
parent 9d7000b1be
commit 5256b2fbe6
2 changed files with 79 additions and 11 deletions
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2
doc/ffmpeg.texi
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@ -830,7 +830,7 @@ be achieved with @code{ffmpeg ... < /dev/null} but it requires a
shell.
@item -debug_ts (@emph{global})
Print timestamp information. It is off by default. This option is
Print timestamp/latency information. It is off by default. This option is
mostly useful for testing and debugging purposes, and the output
format may change from one version to another, so it should not be
employed by portable scripts.

88
fftools/ffmpeg_mux.c
View File

@ -25,10 +25,12 @@
#include "ffmpeg_utils.h"
#include "sync_queue.h"
#include "libavutil/avstring.h"
#include "libavutil/fifo.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/log.h"
#include "libavutil/mem.h"
#include "libavutil/time.h"
#include "libavutil/timestamp.h"
#include "libavcodec/packet.h"
@ -59,6 +61,80 @@ static int64_t filesize(AVIOContext *pb)
return ret;
}
static void mux_log_debug_ts(OutputStream *ost, const AVPacket *pkt)
{
static const char *desc[] = {
[LATENCY_PROBE_DEMUX] = "demux",
[LATENCY_PROBE_DEC_PRE] = "decode",
[LATENCY_PROBE_DEC_POST] = "decode",
[LATENCY_PROBE_FILTER_PRE] = "filter",
[LATENCY_PROBE_FILTER_POST] = "filter",
[LATENCY_PROBE_ENC_PRE] = "encode",
[LATENCY_PROBE_ENC_POST] = "encode",
[LATENCY_PROBE_NB] = "mux",
};
char latency[512];
*latency = 0;
if (pkt->opaque_ref) {
const FrameData *fd = (FrameData*)pkt->opaque_ref->data;
int64_t now = av_gettime_relative();
int64_t total = INT64_MIN;
int next;
for (unsigned i = 0; i < FF_ARRAY_ELEMS(fd->wallclock); i = next) {
int64_t val = fd->wallclock[i];
next = i + 1;
if (val == INT64_MIN)
continue;
if (total == INT64_MIN) {
total = now - val;
snprintf(latency, sizeof(latency), "total:%gms", total / 1e3);
}
// find the next valid entry
for (; next <= FF_ARRAY_ELEMS(fd->wallclock); next++) {
int64_t val_next = (next == FF_ARRAY_ELEMS(fd->wallclock)) ?
now : fd->wallclock[next];
int64_t diff;
if (val_next == INT64_MIN)
continue;
diff = val_next - val;
// print those stages that take at least 5% of total
if (100. * diff > 5. * total) {
av_strlcat(latency, ", ", sizeof(latency));
if (!strcmp(desc[i], desc[next]))
av_strlcat(latency, desc[i], sizeof(latency));
else
av_strlcatf(latency, sizeof(latency), "%s-%s:",
desc[i], desc[next]);
av_strlcatf(latency, sizeof(latency), " %gms/%d%%",
diff / 1e3, (int)(100. * diff / total));
}
break;
}
}
}
av_log(ost, AV_LOG_INFO, "muxer <- pts:%s pts_time:%s dts:%s dts_time:%s "
"duration:%s duration_time:%s size:%d latency(%s)\n",
av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &ost->st->time_base),
av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &ost->st->time_base),
av_ts2str(pkt->duration), av_ts2timestr(pkt->duration, &ost->st->time_base),
pkt->size, *latency ? latency : "N/A");
}
static int write_packet(Muxer *mux, OutputStream *ost, AVPacket *pkt)
{
MuxStream *ms = ms_from_ost(ost);
@ -140,16 +216,8 @@ static int write_packet(Muxer *mux, OutputStream *ost, AVPacket *pkt)
pkt->stream_index = ost->index;
if (debug_ts) {
av_log(ost, AV_LOG_INFO, "muxer <- type:%s "
"pkt_pts:%s pkt_pts_time:%s pkt_dts:%s pkt_dts_time:%s duration:%s duration_time:%s size:%d\n",
av_get_media_type_string(ost->type),
av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &ost->st->time_base),
av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &ost->st->time_base),
av_ts2str(pkt->duration), av_ts2timestr(pkt->duration, &ost->st->time_base),
pkt->size
);
}
if (debug_ts)
mux_log_debug_ts(ost, pkt);
if (ms->stats.io)
enc_stats_write(ost, &ms->stats, NULL, pkt, frame_num);