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Code Issues Releases Activity

avfilter/src_movie: Add option to remove timestamp discontinuities

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This can also be extended to remove discontiuities caused by seek commands

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2016-05-25 17:55:29 +02:00
parent d46a8e30dc
commit fdd8aac7e1
2 changed files with 27 additions and 0 deletions
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5
doc/filters.texi
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@@ -16973,6 +16973,11 @@ Default value is "1".
Note that when the movie is looped the source timestamps are not
changed, so it will generate non monotonically increasing timestamps.
@item discontinuity
Specifies the time difference between frames above which the point is
considered a timestamp discontinuity which is removed by adjusting the later
timestamps.
@end table
It allows overlaying a second video on top of the main input of

22
libavfilter/src_movie.c
View File

@@ -48,6 +48,8 @@ typedef struct MovieStream {
AVStream *st;
AVCodecContext *codec_ctx;
int done;
int64_t discontinuity_threshold;
int64_t last_pts;
} MovieStream;
typedef struct MovieContext {
@@ -60,6 +62,8 @@ typedef struct MovieContext {
char *stream_specs; /**< user-provided list of streams, separated by + */
int stream_index; /**< for compatibility */
int loop_count;
int64_t discontinuity_threshold;
int64_t ts_offset;
AVFormatContext *format_ctx;
int eof;
@@ -84,6 +88,7 @@ static const AVOption movie_options[]= {
{ "streams", "set streams", OFFSET(stream_specs), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MAX, CHAR_MAX, FLAGS },
{ "s", "set streams", OFFSET(stream_specs), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MAX, CHAR_MAX, FLAGS },
{ "loop", "set loop count", OFFSET(loop_count), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, FLAGS },
{ "discontinuity", "set discontinuity threshold", OFFSET(discontinuity_threshold), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, INT64_MAX, FLAGS },
{ NULL },
};
@@ -282,6 +287,8 @@ static av_cold int movie_common_init(AVFilterContext *ctx)
st->discard = AVDISCARD_DEFAULT;
movie->st[i].st = st;
movie->max_stream_index = FFMAX(movie->max_stream_index, st->index);
movie->st[i].discontinuity_threshold =
av_rescale_q(movie->discontinuity_threshold, AV_TIME_BASE_Q, st->time_base);
}
if (av_strtok(NULL, "+", &cursor))
return AVERROR_BUG;
@@ -549,6 +556,21 @@ static int movie_push_frame(AVFilterContext *ctx, unsigned out_id)
}
frame->pts = av_frame_get_best_effort_timestamp(frame);
if (frame->pts != AV_NOPTS_VALUE) {
if (movie->ts_offset)
frame->pts += av_rescale_q_rnd(movie->ts_offset, AV_TIME_BASE_Q, outlink->time_base, AV_ROUND_UP);
if (st->discontinuity_threshold) {
if (st->last_pts != AV_NOPTS_VALUE) {
int64_t diff = frame->pts - st->last_pts;
if (diff < 0 || diff > st->discontinuity_threshold) {
av_log(ctx, AV_LOG_VERBOSE, "Discontinuity in stream:%d diff:%"PRId64"\n", pkt_out_id, diff);
movie->ts_offset += av_rescale_q_rnd(-diff, outlink->time_base, AV_TIME_BASE_Q, AV_ROUND_UP);
frame->pts -= diff;
}
}
}
st->last_pts = frame->pts;
}
ff_dlog(ctx, "movie_push_frame(): file:'%s' %s\n", movie->file_name,
describe_frame_to_str((char[1024]){0}, 1024, frame, frame_type, outlink));