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Code Issues Releases Activity

lavfi/vf_decimate: use inverse of output framerate as timebase

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This filter currently keeps the input timebase, but produces CFR output.
It is thus simpler to use 1/output fps as the output timebase.

Also, set output frame durations.
This commit is contained in:
Anton Khirnov 2022-10-10 16:00:09 +02:00
parent 0ce7a86e31
commit 984c751b12
1 changed files with 6 additions and 5 deletions
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11
libavfilter/vf_decimate.c
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@ -43,7 +43,6 @@ typedef struct DecimateContext {
AVFrame *last; ///< last frame from the previous queue
AVFrame **clean_src; ///< frame queue for the clean source
int got_frame[2]; ///< frame request flag for each input stream
AVRational ts_unit; ///< timestamp units for the output frames
int64_t last_pts; ///< last output timestamp
int64_t start_pts; ///< base for output timestamps
uint32_t eof; ///< bitmask for end of stream
@ -213,6 +212,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
/* push all frames except the drop */
ret = 0;
for (i = 0; i < dm->cycle && dm->queue[i].frame; i++) {
AVRational in_tb = ctx->inputs[INPUT_MAIN]->time_base;
if (i == drop) {
if (dm->ppsrc)
av_frame_free(&dm->clean_src[i]);
@ -221,7 +221,8 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
AVFrame *frame = dm->queue[i].frame;
dm->queue[i].frame = NULL;
if (frame->pts != AV_NOPTS_VALUE && dm->start_pts == AV_NOPTS_VALUE)
dm->start_pts = frame->pts;
dm->start_pts = av_rescale_q(frame->pts, in_tb, outlink->time_base);
if (dm->ppsrc) {
av_frame_free(&frame);
frame = dm->clean_src[i];
@ -229,8 +230,9 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
continue;
dm->clean_src[i] = NULL;
}
frame->pts = av_rescale_q(outlink->frame_count_in, dm->ts_unit, (AVRational){1,1}) +
frame->pts = outlink->frame_count_in +
(dm->start_pts == AV_NOPTS_VALUE ? 0 : dm->start_pts);
frame->duration = 1;
dm->last_pts = frame->pts;
ret = ff_filter_frame(outlink, frame);
if (ret < 0)
@ -404,7 +406,7 @@ static int config_output(AVFilterLink *outlink)
fps = av_mul_q(fps, (AVRational){dm->cycle - 1, dm->cycle});
av_log(ctx, AV_LOG_VERBOSE, "FPS: %d/%d -> %d/%d\n",
inlink->frame_rate.num, inlink->frame_rate.den, fps.num, fps.den);
outlink->time_base = inlink->time_base;
outlink->time_base = av_inv_q(fps);
outlink->frame_rate = fps;
outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
if (dm->ppsrc) {
@ -414,7 +416,6 @@ static int config_output(AVFilterLink *outlink)
outlink->w = inlink->w;
outlink->h = inlink->h;
}
dm->ts_unit = av_inv_q(av_mul_q(fps, outlink->time_base));
return 0;
}