[gst-devel] gst-ffmpeg and problems with seeking

[Michael Smith]

On Fri, Nov 6, 2009 at 3:19 PM, Baek Chang <baeksan at ccrma.stanford.edu> wrote:
> Hi,
>
> I seem to be having a problem with using gst-ffmpeg and trying to do seeks
> with mp3 playback.  I've debugged gst-ffmpeg slightly and noticed that the
> duration and filesize that is returned from parsing the stream info seems to
> be incorrect.
>
> The mp3 I am trying to play has a length of 6:52, and file size of 6.3MB
>
> gst-ffmpeg is returning the following:
> 0:00:52.358563334  6566   0x11faf0 DEBUG               ffmpeg
> gstffmpeg.c:87:gst_ffmpeg_av_find_stream_info: Duration: 00:00:03.51
> 0:00:52.361220000  6566   0x11faf0 DEBUG               ffmpeg
> gstffmpeg.c:95:gst_ffmpeg_av_find_stream_info: Start time: 0.000000
>
>
>
> Having the incorrect file size and duration of the file could cause problems
> with seeking outside of the range.  When I try to seek, it always goes back
> to the beginning of the file. Is this a known problem with gst-ffmpeg,
> reporting the incorrect duration and file size?

You shouldn't use ffdec_mp3 at all, probably. However, if you do, you
should use mp3parse beforehand - and that applies to any other mp3
decoder as well. mp3parse should be capable of reporting accurate
durations, and seeking properly, in almost all cases.

Mike