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ffmpeg: add option not to offset seek position by start time

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
wm4 2015-04-20 19:36:51 +02:00 committed by Michael Niedermayer
parent 57865a9747
commit bac7084fbd
3 changed files with 13 additions and 1 deletions
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7
doc/ffmpeg.texi
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@ -1158,6 +1158,13 @@ This option enables or disables accurate seeking in input files with the
transcoding. Use @option{-noaccurate_seek} to disable it, which may be useful
e.g. when copying some streams and transcoding the others.
@item -seek_timestamp (@emph{input})
This option enables or disables seeking by timestamp in input files with the
@option{-ss} option. It is disabled by default. If enabled, the argument
to the @option{-ss} option is considered an actual timestamp, and is not
offset by the start time of the file. This matters only for files which do
not start from timestamp 0, such as transport streams.
@item -thread_queue_size @var{size} (@emph{input})
This option sets the maximum number of queued packets when reading from the
file or device. With low latency / high rate live streams, packets may be

2
ffmpeg.h
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@ -92,6 +92,7 @@ typedef struct OptionsContext {
/* input/output options */
int64_t start_time;
int seek_timestamp;
const char *format;
SpecifierOpt *codec_names;
@ -339,6 +340,7 @@ typedef struct InputFile {
int64_t ts_offset;
int64_t last_ts;
int64_t start_time; /* user-specified start time in AV_TIME_BASE or AV_NOPTS_VALUE */
int seek_timestamp;
int64_t recording_time;
int nb_streams; /* number of stream that ffmpeg is aware of; may be different
from ctx.nb_streams if new streams appear during av_read_frame() */

5
ffmpeg_opt.c
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@ -919,7 +919,7 @@ static int open_input_file(OptionsContext *o, const char *filename)
timestamp = (o->start_time == AV_NOPTS_VALUE) ? 0 : o->start_time;
/* add the stream start time */
if (ic->start_time != AV_NOPTS_VALUE)
if (!o->seek_timestamp && ic->start_time != AV_NOPTS_VALUE)
timestamp += ic->start_time;
/* if seeking requested, we execute it */
@ -2865,6 +2865,9 @@ const OptionDef options[] = {
{ "ss", HAS_ARG | OPT_TIME | OPT_OFFSET |
OPT_INPUT | OPT_OUTPUT, { .off = OFFSET(start_time) },
"set the start time offset", "time_off" },
{ "seek_timestamp", HAS_ARG | OPT_INT | OPT_OFFSET |
OPT_INPUT, { .off = OFFSET(seek_timestamp) },
"enable/disable seeking by timestamp with -ss" },
{ "accurate_seek", OPT_BOOL | OPT_OFFSET | OPT_EXPERT |
OPT_INPUT, { .off = OFFSET(accurate_seek) },
"enable/disable accurate seeking with -ss" },