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dashenc: Don't segment all video streams when one stream gets a keyframe

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This makes sure that segments actually start at a keyframe (and
makes sure we don't split segments twice in a row, with one segment
consisting of only a handful of packets), when one stream uses b-frames
while another one doesn't.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2014-11-17 15:26:17 +02:00
parent 6f26f14f13
commit fe42f94ce1
1 changed files with 19 additions and 6 deletions
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25
libavformat/dashenc.c
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@ -75,7 +75,6 @@ typedef struct DASHContext {
int single_file;
OutputStream *streams;
int has_video, has_audio;
int nb_segments;
int last_duration;
int total_duration;
char availability_start_time[100];
@ -595,10 +594,13 @@ static void find_index_range(AVFormatContext *s, const char *dirname,
*index_length = AV_RB32(&buf[0]);
}
static int dash_flush(AVFormatContext *s, int final)
static int dash_flush(AVFormatContext *s, int final, int stream)
{
DASHContext *c = s->priv_data;
int i, ret = 0;
int cur_flush_segment_index = 0;
if (stream >= 0)
cur_flush_segment_index = c->streams[stream].segment_index;
for (i = 0; i < s->nb_streams; i++) {
OutputStream *os = &c->streams[i];
@ -609,6 +611,18 @@ static int dash_flush(AVFormatContext *s, int final)
if (!os->packets_written)
continue;
// Flush the single stream that got a keyframe right now.
// Flush all audio streams as well, in sync with video keyframes,
// but not the other video streams.
if (stream >= 0 && i != stream) {
if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_AUDIO)
continue;
// Make sure we don't flush audio streams multiple times, when
// all video streams are flushed one at a time.
if (c->has_video && os->segment_index > cur_flush_segment_index)
continue;
}
if (!c->single_file) {
snprintf(filename, sizeof(filename), "chunk-stream%d-%05d.m4s", i, os->segment_index);
snprintf(full_path, sizeof(full_path), "%s%s", c->dirname, filename);
@ -665,7 +679,7 @@ static int dash_write_packet(AVFormatContext *s, AVPacket *pkt)
DASHContext *c = s->priv_data;
AVStream *st = s->streams[pkt->stream_index];
OutputStream *os = &c->streams[pkt->stream_index];
int64_t seg_end_duration = (c->nb_segments + 1) * (int64_t) c->min_seg_duration;
int64_t seg_end_duration = (os->segment_index) * (int64_t) c->min_seg_duration;
int ret;
// If forcing the stream to start at 0, the mp4 muxer will set the start
@ -701,9 +715,8 @@ static int dash_write_packet(AVFormatContext *s, AVPacket *pkt)
}
}
if ((ret = dash_flush(s, 0)) < 0)
if ((ret = dash_flush(s, 0, pkt->stream_index)) < 0)
return ret;
c->nb_segments++;
}
if (!os->packets_written)
@ -729,7 +742,7 @@ static int dash_write_trailer(AVFormatContext *s)
s->streams[0]->time_base,
AV_TIME_BASE_Q);
}
dash_flush(s, 1);
dash_flush(s, 1, -1);
if (c->remove_at_exit) {
char filename[1024];