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fftools/ffmpeg: move video frame dup/drop logic into its own function

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This commit is contained in:
Anton Khirnov 2022-11-28 12:07:01 +01:00
parent 5874ca3650
commit a848a5a223
1 changed files with 75 additions and 62 deletions
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137
fftools/ffmpeg.c
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@ -1030,6 +1030,79 @@ static void do_subtitle_out(OutputFile *of,
}
}
/* Convert frame timestamps to the encoder timebase and decide how many times
* should this (and possibly previous) frame be repeated in order to conform to
* desired target framerate (if any).
*/
static void video_sync_process(OutputFile *of, OutputStream *ost,
AVFrame *next_picture, double duration,
int64_t *nb_frames, int64_t *nb_frames_prev)
{
double delta0, delta;
double sync_ipts = adjust_frame_pts_to_encoder_tb(of, ost, next_picture);
/* delta0 is the "drift" between the input frame (next_picture) and
* where it would fall in the output. */
delta0 = sync_ipts - ost->next_pts;
delta = delta0 + duration;
// tracks the number of times the PREVIOUS frame should be duplicated,
// mostly for variable framerate (VFR)
*nb_frames_prev = 0;
/* by default, we output a single frame */
*nb_frames = 1;
if (delta0 < 0 &&
delta > 0 &&
ost->vsync_method != VSYNC_PASSTHROUGH &&
ost->vsync_method != VSYNC_DROP) {
if (delta0 < -0.6) {
av_log(NULL, AV_LOG_VERBOSE, "Past duration %f too large\n", -delta0);
} else
av_log(NULL, AV_LOG_DEBUG, "Clipping frame in rate conversion by %f\n", -delta0);
sync_ipts = ost->next_pts;
duration += delta0;
delta0 = 0;
}
switch (ost->vsync_method) {
case VSYNC_VSCFR:
if (ost->vsync_frame_number == 0 && delta0 >= 0.5) {
av_log(NULL, AV_LOG_DEBUG, "Not duplicating %d initial frames\n", (int)lrintf(delta0));
delta = duration;
delta0 = 0;
ost->next_pts = llrint(sync_ipts);
}
case VSYNC_CFR:
// FIXME set to 0.5 after we fix some dts/pts bugs like in avidec.c
if (frame_drop_threshold && delta < frame_drop_threshold && ost->vsync_frame_number) {
*nb_frames = 0;
} else if (delta < -1.1)
*nb_frames = 0;
else if (delta > 1.1) {
*nb_frames = llrintf(delta);
if (delta0 > 1.1)
*nb_frames_prev = llrintf(delta0 - 0.6);
}
next_picture->duration = 1;
break;
case VSYNC_VFR:
if (delta <= -0.6)
*nb_frames = 0;
else if (delta > 0.6)
ost->next_pts = llrint(sync_ipts);
next_picture->duration = duration;
break;
case VSYNC_DROP:
case VSYNC_PASSTHROUGH:
next_picture->duration = duration;
ost->next_pts = llrint(sync_ipts);
break;
default:
av_assert0(0);
}
}
static enum AVPictureType forced_kf_apply(KeyframeForceCtx *kf, AVRational tb,
const AVFrame *in_picture, int dup_idx)
{
@ -1089,7 +1162,6 @@ static void do_video_out(OutputFile *of,
AVCodecContext *enc = ost->enc_ctx;
AVRational frame_rate;
int64_t nb_frames, nb_frames_prev, i;
double delta, delta0;
double duration = 0;
InputStream *ist = ost->ist;
AVFilterContext *filter = ost->filter->filter;
@ -1118,67 +1190,8 @@ static void do_video_out(OutputFile *of,
ost->last_nb0_frames[1],
ost->last_nb0_frames[2]);
} else {
double sync_ipts = adjust_frame_pts_to_encoder_tb(of, ost, next_picture);
/* delta0 is the "drift" between the input frame (next_picture) and
* where it would fall in the output. */
delta0 = sync_ipts - ost->next_pts;
delta = delta0 + duration;
// tracks the number of times the PREVIOUS frame should be duplicated,
// mostly for variable framerate (VFR)
nb_frames_prev = 0;
/* by default, we output a single frame */
nb_frames = 1;
if (delta0 < 0 &&
delta > 0 &&
ost->vsync_method != VSYNC_PASSTHROUGH &&
ost->vsync_method != VSYNC_DROP) {
if (delta0 < -0.6) {
av_log(NULL, AV_LOG_VERBOSE, "Past duration %f too large\n", -delta0);
} else
av_log(NULL, AV_LOG_DEBUG, "Clipping frame in rate conversion by %f\n", -delta0);
sync_ipts = ost->next_pts;
duration += delta0;
delta0 = 0;
}
switch (ost->vsync_method) {
case VSYNC_VSCFR:
if (ost->vsync_frame_number == 0 && delta0 >= 0.5) {
av_log(NULL, AV_LOG_DEBUG, "Not duplicating %d initial frames\n", (int)lrintf(delta0));
delta = duration;
delta0 = 0;
ost->next_pts = llrint(sync_ipts);
}
case VSYNC_CFR:
// FIXME set to 0.5 after we fix some dts/pts bugs like in avidec.c
if (frame_drop_threshold && delta < frame_drop_threshold && ost->vsync_frame_number) {
nb_frames = 0;
} else if (delta < -1.1)
nb_frames = 0;
else if (delta > 1.1) {
nb_frames = llrintf(delta);
if (delta0 > 1.1)
nb_frames_prev = llrintf(delta0 - 0.6);
}
next_picture->duration = 1;
break;
case VSYNC_VFR:
if (delta <= -0.6)
nb_frames = 0;
else if (delta > 0.6)
ost->next_pts = llrint(sync_ipts);
next_picture->duration = duration;
break;
case VSYNC_DROP:
case VSYNC_PASSTHROUGH:
next_picture->duration = duration;
ost->next_pts = llrint(sync_ipts);
break;
default:
av_assert0(0);
}
video_sync_process(of, ost, next_picture, duration,
&nb_frames, &nb_frames_prev);
}
memmove(ost->last_nb0_frames + 1,