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fftools/ffmpeg: rename a variable to be more descriptive

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This commit is contained in:
Anton Khirnov 2022-11-28 11:21:37 +01:00
parent 3b21f10639
commit 5874ca3650
1 changed files with 14 additions and 12 deletions
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22
fftools/ffmpeg.c
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@ -1088,7 +1088,7 @@ static void do_video_out(OutputFile *of,
int ret;
AVCodecContext *enc = ost->enc_ctx;
AVRational frame_rate;
int64_t nb_frames, nb0_frames, i;
int64_t nb_frames, nb_frames_prev, i;
double delta, delta0;
double duration = 0;
InputStream *ist = ost->ist;
@ -1114,7 +1114,7 @@ static void do_video_out(OutputFile *of,
if (!next_picture) {
//end, flushing
nb0_frames = nb_frames = mid_pred(ost->last_nb0_frames[0],
nb_frames_prev = nb_frames = mid_pred(ost->last_nb0_frames[0],
ost->last_nb0_frames[1],
ost->last_nb0_frames[2]);
} else {
@ -1124,8 +1124,10 @@ static void do_video_out(OutputFile *of,
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 */
nb0_frames = 0; // tracks the number of times the PREVIOUS frame should be duplicated, mostly for variable framerate (VFR)
nb_frames = 1;
if (delta0 < 0 &&
@ -1158,7 +1160,7 @@ static void do_video_out(OutputFile *of,
else if (delta > 1.1) {
nb_frames = llrintf(delta);
if (delta0 > 1.1)
nb0_frames = llrintf(delta0 - 0.6);
nb_frames_prev = llrintf(delta0 - 0.6);
}
next_picture->duration = 1;
break;
@ -1182,35 +1184,35 @@ static void do_video_out(OutputFile *of,
memmove(ost->last_nb0_frames + 1,
ost->last_nb0_frames,
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] = nb_frames_prev;
if (nb0_frames == 0 && ost->last_dropped) {
if (nb_frames_prev == 0 && ost->last_dropped) {
nb_frames_drop++;
av_log(NULL, AV_LOG_VERBOSE,
"*** dropping frame %"PRId64" from stream %d at ts %"PRId64"\n",
ost->vsync_frame_number, ost->st->index, ost->last_frame->pts);
}
if (nb_frames > (nb0_frames && ost->last_dropped) + (nb_frames > nb0_frames)) {
if (nb_frames > (nb_frames_prev && ost->last_dropped) + (nb_frames > nb_frames_prev)) {
if (nb_frames > dts_error_threshold * 30) {
av_log(NULL, AV_LOG_ERROR, "%"PRId64" frame duplication too large, skipping\n", nb_frames - 1);
nb_frames_drop++;
return;
}
nb_frames_dup += nb_frames - (nb0_frames && ost->last_dropped) - (nb_frames > nb0_frames);
nb_frames_dup += nb_frames - (nb_frames_prev && ost->last_dropped) - (nb_frames > nb_frames_prev);
av_log(NULL, AV_LOG_VERBOSE, "*** %"PRId64" dup!\n", nb_frames - 1);
if (nb_frames_dup > dup_warning) {
av_log(NULL, AV_LOG_WARNING, "More than %"PRIu64" frames duplicated\n", dup_warning);
dup_warning *= 10;
}
}
ost->last_dropped = nb_frames == nb0_frames && next_picture;
ost->last_dropped = nb_frames == nb_frames_prev && next_picture;
ost->kf.dropped_keyframe = ost->last_dropped && next_picture && next_picture->key_frame;
/* duplicates frame if needed */
for (i = 0; i < nb_frames; i++) {
AVFrame *in_picture;
if (i < nb0_frames && ost->last_frame->buf[0]) {
if (i < nb_frames_prev && ost->last_frame->buf[0]) {
in_picture = ost->last_frame;
} else
in_picture = next_picture;