[MPlayer-dev-eng] Strange behavior with audio delayed video files

[Ingo Brückl]

Reimar Döffinger wrote on Fri, 21 Feb 2014 08:38:10 +0100:

> On 21 February 2014 00:19:25 CET, "Ingo Brückl" <ib at wupperonline.de>
> wrote:
>>Reimar Döffinger wrote on Thu, 20 Feb 2014 21:21:49 +0100:
>>
>>> On Thu, Feb 20, 2014 at 07:29:50PM +0100, Ingo Brückl wrote:
>>>> When I use FFmpeg (ffmpeg -i file.mkv -itsoffset 60 -i file.mkv
>>-codec copy
>>>> -map 0:v -map 1:a sync.mkv) to adjust an audio delay (60 seconds in
>>this
>>>> example) I'm experiencing a strange behavior with MPlayer playback.
>>The audio
>>>> firstly starts at the very beginning as if no delay had been set.
>>When I jump
>>>> back to the beginning, it runs silent until 60 seconds have been
>>played, and
>>>> every seeking is OK, i.e. the audio is in sync now.
>>>>
>>>> So, is the first playback with immediate audio a MPlayer bug?
>>
>>> MPlayer always plays audio right from the start.
>>> I guess you could call that a bug, [...]
>>
>>I would do so, if audio timestamps say that it should play only later.

> That is a feature that is rarely used, and in general rarely useful, [...]

Well, I won't insist, but I what I don't understand: While audio starts at
the beginning when playback starts, it is immediately silent after pressing
"skip back", i.e. MPlayer does know about and does follow the delayed audio
information, but only after (the first) seeking. Why is that?

Ingo