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ffmpeg: Fixing typos and adding comments to fps code

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Bryan Huh 2015-11-14 18:23:20 -08:00 committed by Michael Niedermayer
parent 7bf465abf3
commit dfa98c4f83
2 changed files with 9 additions and 9 deletions
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16
ffmpeg.c
View File

@ -984,11 +984,11 @@ static void do_video_out(AVFormatContext *s,
ost->last_nb0_frames[1], ost->last_nb0_frames[1],
ost->last_nb0_frames[2]); ost->last_nb0_frames[2]);
} else { } else {
delta0 = sync_ipts - ost->sync_opts; delta0 = sync_ipts - ost->sync_opts; // delta0 is the "drift" between the input frame (next_picture) and where it would fall in the output.
delta = delta0 + duration; delta = delta0 + duration;
/* by default, we output a single frame */ /* by default, we output a single frame */
nb0_frames = 0; nb0_frames = 0; // tracks the number of times the PREVIOUS frame should be duplicated, mostly for variable framerate (VFR)
nb_frames = 1; nb_frames = 1;
format_video_sync = video_sync_method; format_video_sync = video_sync_method;
@ -1017,7 +1017,7 @@ static void do_video_out(AVFormatContext *s,
if (delta0 < -0.6) { if (delta0 < -0.6) {
av_log(NULL, AV_LOG_WARNING, "Past duration %f too large\n", -delta0); av_log(NULL, AV_LOG_WARNING, "Past duration %f too large\n", -delta0);
} else } else
av_log(NULL, AV_LOG_DEBUG, "Cliping frame in rate conversion by %f\n", -delta0); av_log(NULL, AV_LOG_DEBUG, "Clipping frame in rate conversion by %f\n", -delta0);
sync_ipts += cor; sync_ipts += cor;
duration -= cor; duration -= cor;
delta0 += cor; delta0 += cor;
@ -1066,22 +1066,22 @@ static void do_video_out(AVFormatContext *s,
sizeof(ost->last_nb0_frames[0]) * (FF_ARRAY_ELEMS(ost->last_nb0_frames) - 1)); sizeof(ost->last_nb0_frames[0]) * (FF_ARRAY_ELEMS(ost->last_nb0_frames) - 1));
ost->last_nb0_frames[0] = nb0_frames; ost->last_nb0_frames[0] = nb0_frames;
if (nb0_frames == 0 && ost->last_droped) { if (nb0_frames == 0 && ost->last_dropped) {
nb_frames_drop++; nb_frames_drop++;
av_log(NULL, AV_LOG_VERBOSE, av_log(NULL, AV_LOG_VERBOSE,
"*** dropping frame %d from stream %d at ts %"PRId64"\n", "*** dropping frame %d from stream %d at ts %"PRId64"\n",
ost->frame_number, ost->st->index, ost->last_frame->pts); ost->frame_number, ost->st->index, ost->last_frame->pts);
} }
if (nb_frames > (nb0_frames && ost->last_droped) + (nb_frames > nb0_frames)) { if (nb_frames > (nb0_frames && ost->last_dropped) + (nb_frames > nb0_frames)) {
if (nb_frames > dts_error_threshold * 30) { if (nb_frames > dts_error_threshold * 30) {
av_log(NULL, AV_LOG_ERROR, "%d frame duplication too large, skipping\n", nb_frames - 1); av_log(NULL, AV_LOG_ERROR, "%d frame duplication too large, skipping\n", nb_frames - 1);
nb_frames_drop++; nb_frames_drop++;
return; return;
} }
nb_frames_dup += nb_frames - (nb0_frames && ost->last_droped) - (nb_frames > nb0_frames); nb_frames_dup += nb_frames - (nb0_frames && ost->last_dropped) - (nb_frames > nb0_frames);
av_log(NULL, AV_LOG_VERBOSE, "*** %d dup!\n", nb_frames - 1); av_log(NULL, AV_LOG_VERBOSE, "*** %d dup!\n", nb_frames - 1);
} }
ost->last_droped = nb_frames == nb0_frames && next_picture; ost->last_dropped = nb_frames == nb0_frames && next_picture;
/* duplicates frame if needed */ /* duplicates frame if needed */
for (i = 0; i < nb_frames; i++) { for (i = 0; i < nb_frames; i++) {
@ -1632,7 +1632,7 @@ static void print_report(int is_last_report, int64_t timer_start, int64_t cur_ti
pts = FFMAX(pts, av_rescale_q(av_stream_get_end_pts(ost->st), pts = FFMAX(pts, av_rescale_q(av_stream_get_end_pts(ost->st),
ost->st->time_base, AV_TIME_BASE_Q)); ost->st->time_base, AV_TIME_BASE_Q));
if (is_last_report) if (is_last_report)
nb_frames_drop += ost->last_droped; nb_frames_drop += ost->last_dropped;
} }
secs = FFABS(pts) / AV_TIME_BASE; secs = FFABS(pts) / AV_TIME_BASE;

2
ffmpeg.h
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@ -414,7 +414,7 @@ typedef struct OutputStream {
int64_t max_frames; int64_t max_frames;
AVFrame *filtered_frame; AVFrame *filtered_frame;
AVFrame *last_frame; AVFrame *last_frame;
int last_droped; int last_dropped;
int last_nb0_frames[3]; int last_nb0_frames[3];
void *hwaccel_ctx; void *hwaccel_ctx;