On Wed, Jul 29, 2015 at 05:32:14PM +0200, Michael Niedermayer wrote: > ffmpeg | branch: master | Michael Niedermayer <mich...@niedermayer.cc> | Mon > Jul 27 04:30:26 2015 +0200| [f4ada6dc3ff7a5c4193d2b30151a48de8e219c94] | > committer: Michael Niedermayer > > ffmpeg: Implement support for seeking relative to EOF > > Fixes Ticket227 > > Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > > > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f4ada6dc3ff7a5c4193d2b30151a48de8e219c94 > --- > > doc/ffmpeg.texi | 5 +++++ > ffmpeg.h | 1 + > ffmpeg_opt.c | 6 ++++++ > 3 files changed, 12 insertions(+) > > diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi > index 4d73788..3806a12 100644 > --- a/doc/ffmpeg.texi > +++ b/doc/ffmpeg.texi > @@ -307,6 +307,11 @@ input until the timestamps reach @var{position}. > > @var{position} may be either in seconds or in @code{hh:mm:ss[.xxx]} form. > > +@item -sseof @var{position} (@emph{input/output}) > + > +Like the -ss option but relative to the "end of file". That is negative
nit: @code{-ss}
> +values are earlier in the file, 0 is at EOF.
> +
So mmh,, this works properly for both the duration of the input, and the
duration of the output (respectively for -sseof as input and output
option)
> @item -itsoffset @var{offset} (@emph{input})
> Set the input time offset.
>
> diff --git a/ffmpeg.h b/ffmpeg.h
> index a7e5e51..7467b16 100644
> --- a/ffmpeg.h
> +++ b/ffmpeg.h
> @@ -92,6 +92,7 @@ typedef struct OptionsContext {
>
> /* input/output options */
> int64_t start_time;
> + int64_t start_time_eof;
> int seek_timestamp;
> const char *format;
>
> diff --git a/ffmpeg_opt.c b/ffmpeg_opt.c
> index 3c9f98a..351c47b 100644
> --- a/ffmpeg_opt.c
> +++ b/ffmpeg_opt.c
> @@ -156,6 +156,7 @@ static void init_options(OptionsContext *o)
> o->stop_time = INT64_MAX;
> o->mux_max_delay = 0.7;
> o->start_time = AV_NOPTS_VALUE;
> + o->start_time_eof = AV_NOPTS_VALUE;
> o->recording_time = INT64_MAX;
> o->limit_filesize = UINT64_MAX;
> o->chapters_input_file = INT_MAX;
> @@ -933,6 +934,8 @@ static int open_input_file(OptionsContext *o, const char
> *filename)
> }
> }
>
> + if (o->start_time_eof != AV_NOPTS_VALUE && ic->duration>0)
> + o->start_time = o->start_time_eof + ic->duration;
You most likely want to print a warning about this having no effect when
the duration can not be computed.
> timestamp = (o->start_time == AV_NOPTS_VALUE) ? 0 : o->start_time;
> /* add the stream start time */
> if (!o->seek_timestamp && ic->start_time != AV_NOPTS_VALUE)
> @@ -3019,6 +3022,9 @@ 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" },
> + { "sseof", HAS_ARG | OPT_TIME | OPT_OFFSET |
> + OPT_INPUT | OPT_OUTPUT, { .off
> = OFFSET(start_time_eof) },
> + "set the start time offset relative to EOF", "time_off" },
> { "seek_timestamp", HAS_ARG | OPT_INT | OPT_OFFSET |
> OPT_INPUT, { .off
> = OFFSET(seek_timestamp) },
> "enable/disable seeking by timestamp with -ss" },
>
--
Clément B.
pgpjGsmzdYz6j.pgp
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