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ffmpeg_opt: Add -start_at_zero option.

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This automatically shifts input timestamps to start at 0 instead of the file's
starting timestamp when using -copyts.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Rodger Combs 2014-10-20 18:50:12 -05:00 committed by Michael Niedermayer
parent 832b4c0a86
commit 315f9e929d
1 changed files with 4 additions and 1 deletions
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ffmpeg_opt.c
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@ -91,6 +91,7 @@ int do_benchmark_all = 0;
int do_hex_dump = 0;
int do_pkt_dump = 0;
int copy_ts = 0;
int start_at_zero = 0;
int copy_tb = -1;
int debug_ts = 0;
int exit_on_error = 0;
@ -921,7 +922,7 @@ static int open_input_file(OptionsContext *o, const char *filename)
f->start_time = o->start_time;
f->recording_time = o->recording_time;
f->input_ts_offset = o->input_ts_offset;
f->ts_offset = o->input_ts_offset - (copy_ts ? 0 : timestamp);
f->ts_offset = o->input_ts_offset - (copy_ts ? (start_at_zero && ic->start_time != AV_NOPTS_VALUE ? ic->start_time : 0) : timestamp);
f->nb_streams = ic->nb_streams;
f->rate_emu = o->rate_emu;
f->accurate_seek = o->accurate_seek;
@ -2840,6 +2841,8 @@ const OptionDef options[] = {
"audio drift threshold", "threshold" },
{ "copyts", OPT_BOOL | OPT_EXPERT, { &copy_ts },
"copy timestamps" },
{ "start_at_zero", OPT_BOOL | OPT_EXPERT, { &start_at_zero },
"shift input timestamps to start at 0 when using copyts" },
{ "copytb", HAS_ARG | OPT_INT | OPT_EXPERT, { &copy_tb },
"copy input stream time base when stream copying", "mode" },
{ "shortest", OPT_BOOL | OPT_EXPERT | OPT_OFFSET |