[Ffmpeg-devel] Seeking with in an MPEGTS

[Andy Parkins]

On Monday 2005 June 27 08:48, Michael Niedermayer wrote:
> > MPEG TS doesn't necessarily return complete frames, so after the seek you
> > are probably getting the end of a frame.  If the decoder parses this as
> > the start of a frame, I can imagine those errors occurring.  Apparently,
> > this leaves the decoder in a permanent state of confusion.  Michael?
>
> i need some sample with which i can reproduce this

Uploaded to

ftp://mplayerhq.hu/MPlayer/incoming/adp-errors-after-seek-050627-2.ts

My version of ffmpeg is not bang up to date; it's a 22nd June checkout.

Using ffplay, the file plays with no errors if no seeks are performed; if a 
seek is performed then errors like this appear:

[mpeg4 @ 0x8376f14]Error, header damaged or not MPEG4 header (f_code=0)
[mpeg4 @ 0x8376f14]hmm, seems the headers are not complete, trying to guess 
time_increment_bits
[mpeg4 @ 0x8376f14]my guess is 1 bits ;)
[mpeg4 @ 0x8376f14]hmm, seems the headers are not complete, trying to guess 
time_increment_bits
[mpeg4 @ 0x8376f14]my guess is 7 bits ;)
[mpeg4 @ 0x8376f14]hmm, seems the headers are not complete, trying to guess 
time_increment_bits
[mpeg4 @ 0x8376f14]my guess is 4 bits ;)
[mpeg4 @ 0x8376f14]hmm, seems the headers are not complete, trying to guess 
time_increment_bits
[mpeg4 @ 0x8376f14]my guess is 3 bits ;)
[mpeg4 @ 0x8376f14]hmm, seems the headers are not complete, trying to guess 
time_increment_bits
[mpeg4 @ 0x8376f14]my guess is 2 bits ;)

And they continue for the remainder of the playback - i.e. well passed the 
next key frame.

If I can be of any help, don't hesitate...


Andy

-- 
Dr Andrew Parkins, M Eng (hons), AMIEE

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