[FFmpeg-cvslog] lavf: add field for how duration is estimated

[Clément Bœsch]

On Mon, Jun 18, 2012 at 09:58:38AM +0200, Michael Bradshaw wrote:
> ffmpeg | branch: master | Michael Bradshaw <mbradshaw at sorensonmedia.com> | Sun Jun 17 22:20:09 2012 -0700| [2243f0d0783922054d10497fc1d6f6fb376f05ff] | committer: Nicolas George
> 
> lavf: add field for how duration is estimated
> 
> Signed-off-by: Michael Bradshaw <mbradshaw at sorensonmedia.com>
> 
> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=2243f0d0783922054d10497fc1d6f6fb376f05ff
> ---
> 
>  libavformat/avformat.h |   17 +++++++++++++++++
>  libavformat/options.c  |    5 +++++
>  libavformat/utils.c    |    3 +++
>  libavformat/version.h  |    4 ++--
>  4 files changed, 27 insertions(+), 2 deletions(-)
> 
> diff --git a/libavformat/avformat.h b/libavformat/avformat.h
> index 19441f8..8650b08 100644
> --- a/libavformat/avformat.h
> +++ b/libavformat/avformat.h
> @@ -1099,8 +1099,25 @@ typedef struct AVFormatContext {
>      int raw_packet_buffer_remaining_size;
>  
>      int avio_flags;
> +
> +    /**
> +     * The duration field can be estimated through various ways, and this field can be used
> +     * to know how the duration was estimated.
> +     */
> +    enum {
> +        AVFMT_DURATION_FROM_PTS,    ///< duration accurately estimated from PTSes
> +        AVFMT_DURATION_FROM_STREAM, ///< duration estimated from a stream with a known duration
> +        AVFMT_DURATION_FROM_BITRATE ///< duration estimated from bitrate (less accurate)
> +    } duration_estimation_method;
[...]

What happens in case the duration is read from the demuxer (for instance
the MOV has entries for a movie duration, and durations per streams)?
Wouldn't the duration_estimation_method set to 0 (and thus assumed to be
from PTS?).

BTW, could we report this somewhere (in ffprobe or w/e)?

-- 
Clément B.
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