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ffmpeg: add -fpsmax to clamp output framerate 

Useful when encoding in batch or with aberrant inputs.
This commit is contained in:
Gyan Doshi 2021-02-01 18:19:18 +05:30
parent 6b8ef5119c
commit d99cc17825
4 changed files with 36 additions and 4 deletions
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7
doc/ffmpeg.texi
View File

@ -759,6 +759,13 @@ If in doubt use @option{-framerate} instead of the input option @option{-r}.
As an output option, duplicate or drop input frames to achieve constant output
frame rate @var{fps}.
@item -fpsmax[:@var{stream_specifier}] @var{fps} (@emph{output,per-stream})
Set maximum frame rate (Hz value, fraction or abbreviation).
Clamps output frame rate when output framerate is auto-set and is higher than this value.
Useful in batch processing or when input framerate is wrongly detected as very high.
It cannot be set together with @code{-r}. It is ignored during streamcopy.
@item -s[:@var{stream_specifier}] @var{size} (@emph{input/output,per-stream})
Set frame size.

7
fftools/ffmpeg.c
View File

@ -3376,7 +3376,7 @@ static int init_output_stream_encode(OutputStream *ost, AVFrame *frame)
ost->frame_rate = ist->framerate;
if (ist && !ost->frame_rate.num)
ost->frame_rate = ist->st->r_frame_rate;
if (ist && !ost->frame_rate.num) {
if (ist && !ost->frame_rate.num && !ost->max_frame_rate.num) {
ost->frame_rate = (AVRational){25, 1};
av_log(NULL, AV_LOG_WARNING,
"No information "
@ -3386,6 +3386,11 @@ static int init_output_stream_encode(OutputStream *ost, AVFrame *frame)
ost->file_index, ost->index);
}
if (ost->max_frame_rate.num &&
(av_q2d(ost->frame_rate) > av_q2d(ost->max_frame_rate) ||
!ost->frame_rate.den))
ost->frame_rate = ost->max_frame_rate;
if (ost->enc->supported_framerates && !ost->force_fps) {
int idx = av_find_nearest_q_idx(ost->frame_rate, ost->enc->supported_framerates);
ost->frame_rate = ost->enc->supported_framerates[idx];

3
fftools/ffmpeg.h
View File

@ -108,6 +108,8 @@ typedef struct OptionsContext {
int nb_audio_sample_rate;
SpecifierOpt *frame_rates;
int nb_frame_rates;
SpecifierOpt *max_frame_rates;
int nb_max_frame_rates;
SpecifierOpt *frame_sizes;
int nb_frame_sizes;
SpecifierOpt *frame_pix_fmts;
@ -479,6 +481,7 @@ typedef struct OutputStream {
/* video only */
AVRational frame_rate;
AVRational max_frame_rate;
int is_cfr;
int force_fps;
int top_field_first;

23
fftools/ffmpeg_opt.c
View File

@ -55,6 +55,7 @@ static const char *const opt_name_codec_names[] = {"c", "codec", "
static const char *const opt_name_audio_channels[] = {"ac", NULL};
static const char *const opt_name_audio_sample_rate[] = {"ar", NULL};
static const char *const opt_name_frame_rates[] = {"r", NULL};
static const char *const opt_name_max_frame_rates[] = {"fpsmax", NULL};
static const char *const opt_name_frame_sizes[] = {"s", NULL};
static const char *const opt_name_frame_pix_fmts[] = {"pix_fmt", NULL};
static const char *const opt_name_ts_scale[] = {"itsscale", NULL};
@ -1688,7 +1689,7 @@ static OutputStream *new_video_stream(OptionsContext *o, AVFormatContext *oc, in
AVStream *st;
OutputStream *ost;
AVCodecContext *video_enc;
char *frame_rate = NULL, *frame_aspect_ratio = NULL;
char *frame_rate = NULL, *max_frame_rate = NULL, *frame_aspect_ratio = NULL;
ost = new_output_stream(o, oc, AVMEDIA_TYPE_VIDEO, source_index);
st = ost->st;
@ -1699,8 +1700,21 @@ static OutputStream *new_video_stream(OptionsContext *o, AVFormatContext *oc, in
av_log(NULL, AV_LOG_FATAL, "Invalid framerate value: %s\n", frame_rate);
exit_program(1);
}
if (frame_rate && video_sync_method == VSYNC_PASSTHROUGH)
av_log(NULL, AV_LOG_ERROR, "Using -vsync 0 and -r can produce invalid output files\n");
MATCH_PER_STREAM_OPT(max_frame_rates, str, max_frame_rate, oc, st);
if (max_frame_rate && av_parse_video_rate(&ost->max_frame_rate, max_frame_rate) < 0) {
av_log(NULL, AV_LOG_FATAL, "Invalid maximum framerate value: %s\n", max_frame_rate);
exit_program(1);
}
if (frame_rate && max_frame_rate) {
av_log(NULL, AV_LOG_ERROR, "Only one of -fpsmax and -r can be set for a stream.\n");
exit_program(1);
}
if ((frame_rate || max_frame_rate) &&
video_sync_method == VSYNC_PASSTHROUGH)
av_log(NULL, AV_LOG_ERROR, "Using -vsync 0 and -r/-fpsmax can produce invalid output files\n");
MATCH_PER_STREAM_OPT(frame_aspect_ratios, str, frame_aspect_ratio, oc, st);
if (frame_aspect_ratio) {
@ -3599,6 +3613,9 @@ const OptionDef options[] = {
{ "r", OPT_VIDEO | HAS_ARG | OPT_STRING | OPT_SPEC |
OPT_INPUT | OPT_OUTPUT, { .off = OFFSET(frame_rates) },
"set frame rate (Hz value, fraction or abbreviation)", "rate" },
{ "fpsmax", OPT_VIDEO | HAS_ARG | OPT_STRING | OPT_SPEC |
OPT_OUTPUT, { .off = OFFSET(max_frame_rates) },
"set max frame rate (Hz value, fraction or abbreviation)", "rate" },
{ "s", OPT_VIDEO | HAS_ARG | OPT_SUBTITLE | OPT_STRING | OPT_SPEC |
OPT_INPUT | OPT_OUTPUT, { .off = OFFSET(frame_sizes) },
"set frame size (WxH or abbreviation)", "size" },