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avconv: distinguish between -ss 0 and -ss not being used

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Using -ss 0 to drop frames with negative timestamps is a perfectly valid
use case.
This commit is contained in:
Anton Khirnov 2013-06-15 09:35:10 +02:00
parent 2e661f26f8
commit 56ee3f9de7
3 changed files with 13 additions and 9 deletions
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10
avconv.c
View File

@ -652,10 +652,11 @@ static int poll_filter(OutputStream *ost)
return ret;
if (filtered_frame->pts != AV_NOPTS_VALUE) {
int64_t start_time = (of->start_time == AV_NOPTS_VALUE) ? 0 : of->start_time;
filtered_frame->pts = av_rescale_q(filtered_frame->pts,
ost->filter->filter->inputs[0]->time_base,
ost->st->codec->time_base) -
av_rescale_q(of->start_time,
av_rescale_q(start_time,
AV_TIME_BASE_Q,
ost->st->codec->time_base);
}
@ -948,7 +949,7 @@ static int check_output_constraints(InputStream *ist, OutputStream *ost)
if (ost->source_index != ist_index)
return 0;
if (of->start_time && ist->last_dts < of->start_time)
if (of->start_time != AV_NOPTS_VALUE && ist->last_dts < of->start_time)
return 0;
return 1;
@ -957,7 +958,8 @@ static int check_output_constraints(InputStream *ist, OutputStream *ost)
static void do_streamcopy(InputStream *ist, OutputStream *ost, const AVPacket *pkt)
{
OutputFile *of = output_files[ost->file_index];
int64_t ost_tb_start_time = av_rescale_q(of->start_time, AV_TIME_BASE_Q, ost->st->time_base);
int64_t start_time = (of->start_time == AV_NOPTS_VALUE) ? 0 : of->start_time;
int64_t ost_tb_start_time = av_rescale_q(start_time, AV_TIME_BASE_Q, ost->st->time_base);
AVPacket opkt;
av_init_packet(&opkt);
@ -967,7 +969,7 @@ static void do_streamcopy(InputStream *ist, OutputStream *ost, const AVPacket *p
return;
if (of->recording_time != INT64_MAX &&
ist->last_dts >= of->recording_time + of->start_time) {
ist->last_dts >= of->recording_time + start_time) {
ost->finished = 1;
return;
}

4
avconv_filter.c
View File

@ -183,7 +183,7 @@ static int insert_trim(OutputStream *ost, AVFilterContext **last_filter, int *pa
char filter_name[128];
int ret = 0;
if (of->recording_time == INT64_MAX && !of->start_time)
if (of->recording_time == INT64_MAX && of->start_time == AV_NOPTS_VALUE)
return 0;
trim = avfilter_get_by_name(name);
@ -203,7 +203,7 @@ static int insert_trim(OutputStream *ost, AVFilterContext **last_filter, int *pa
ret = av_opt_set_double(ctx, "duration", (double)of->recording_time / 1e6,
AV_OPT_SEARCH_CHILDREN);
}
if (ret >= 0 && of->start_time) {
if (ret >= 0 && of->start_time != AV_NOPTS_VALUE) {
ret = av_opt_set_double(ctx, "start", (double)of->start_time / 1e6,
AV_OPT_SEARCH_CHILDREN);
}

8
avconv_opt.c
View File

@ -113,6 +113,7 @@ static void init_options(OptionsContext *o)
memset(o, 0, sizeof(*o));
o->mux_max_delay = 0.7;
o->start_time = AV_NOPTS_VALUE;
o->recording_time = INT64_MAX;
o->limit_filesize = UINT64_MAX;
o->chapters_input_file = INT_MAX;
@ -658,13 +659,13 @@ static int open_input_file(OptionsContext *o, const char *filename)
exit_program(1);
}
timestamp = o->start_time;
timestamp = (o->start_time == AV_NOPTS_VALUE) ? 0 : o->start_time;
/* add the stream start time */
if (ic->start_time != AV_NOPTS_VALUE)
timestamp += ic->start_time;
/* if seeking requested, we execute it */
if (o->start_time != 0) {
if (o->start_time != AV_NOPTS_VALUE) {
ret = av_seek_frame(ic, -1, timestamp, AVSEEK_FLAG_BACKWARD);
if (ret < 0) {
av_log(NULL, AV_LOG_WARNING, "%s: could not seek to position %0.3f\n",
@ -1212,7 +1213,8 @@ static int copy_chapters(InputFile *ifile, OutputFile *ofile, int copy_metadata)
for (i = 0; i < is->nb_chapters; i++) {
AVChapter *in_ch = is->chapters[i], *out_ch;
int64_t ts_off = av_rescale_q(ofile->start_time - ifile->ts_offset,
int64_t start_time = (ofile->start_time == AV_NOPTS_VALUE) ? 0 : ofile->start_time;
int64_t ts_off = av_rescale_q(start_time - ifile->ts_offset,
AV_TIME_BASE_Q, in_ch->time_base);
int64_t rt = (ofile->recording_time == INT64_MAX) ? INT64_MAX :
av_rescale_q(ofile->recording_time, AV_TIME_BASE_Q, in_ch->time_base);