[MPlayer-dev-eng] [PATCH] libass: fix parsing of tracks extracted from containers

[Ivan Kalvachev]

On 9/10/08, Michael Niedermayer <michaelni at gmx.at> wrote:
> On Wed, Sep 10, 2008 at 03:26:55PM +0300, Ivan Kalvachev wrote:
>> On 9/10/08, Michael Niedermayer <michaelni at gmx.at> wrote:
>> > On Sun, Sep 07, 2008 at 06:23:11PM +0300, Uoti Urpala wrote:
> [...]
>> >> think your proposal to move all timing information to the codec level
>> >> to
>> >> avoid the container limitations is problematic. It is the opposite of
>> >> what is done with audio and video. Audio has an implicit duration based
>> >
>> > mpeg2 video does have a duration field in its bitstream, quite well
>> > known
>> > for things like telecine.
>>
>> Soft telecine is implemented by the combined use of repeat_first_field
>> and top_field_first in progressive picture. It only increase the
>> duration(1/fps) by 50%.
>> There is no way to specify duration.
>
> first, what you say is not correct (read the spec).

Be so kind to correct me and to tell me what and where exactly should I read.
I did read the documentation before sending the mail, and
I am quite familiar with the way DVB subtitles work.

> second a duration field limted to 1 and 1.5 is still a duration field.

Duration field of 1-1.5 *1/fps is useless for subtitles.