theora - Feb 2010 - Impossible to encode this file in sync

Hi all,

I am unable, using ffmpeg2theora 0.26, to encode this mpeg file in
theora without audio/video sync problems :
http://dl.rom1v.com/noindex/test.mpg

The file works correctly using vlc or mplayer, but totem has sync
problems for playing it.

For information, it is a TV stream I recorded using :
vlc
"rtsp://mafreebox.freebox.fr/fbxtv_pub/stream?namespace=1&service=201&flavour=sd"
":sout=#std{access=file,mux=ps,dst=$out}"

(don't try, you won't access this URL, it is accessible only using
"Free", one particular French provider)

If you have any idea?

Thank you for your help.

?om

On 19 February 2010 07:58, ?om <rom at rom1v.com>
wrote:
> Hi all,
>
> I am unable, using ffmpeg2theora 0.26, to encode this mpeg file in
> theora without audio/video sync problems :
> http://dl.rom1v.com/noindex/test.mpg
Can you post the Ogg file you have generated?

What ffmpeg2theora options did you use?
> The file works correctly using vlc or mplayer, but totem has sync
> problems for playing it.
Sounds like an issue in totem; which totem version are you using?

Conrad.

On Feb 18, 2010, at 2:58 PM, ?om wrote:
> Hi all,
> 
> I am unable, using ffmpeg2theora 0.26, to encode this mpeg file in
> theora without audio/video sync problems :
> http://dl.rom1v.com/noindex/test.mpg
> 
> The file works correctly using vlc or mplayer, but totem has sync
> problems for playing it.
I experience sync problems with VLC 1.0.5 on OS X.

Interestingly, this doesn't seem to happen when using Theora/Vorbis and
HandBrake (which also uses stuff from FFmpeg.) It might be interesting to see
what they're doing differently that's keeping it in sync...

I used ffmpeg2theora 0.26 :
ffmpeg2theora test.mpg

I tested with --sync and --nosync, same problem.

You can download the ogv here :
http://dl.rom1v.com/noindex/test.ogv

?om


"Conrad Parker" <conrad at metadecks.org> a ?crit :
>On 19 February 2010 07:58, ?om <rom at rom1v.com> wrote:
>> Hi all,
>>
>> I am unable, using ffmpeg2theora 0.26, to encode this mpeg file in
>> theora without audio/video sync problems :
>> http://dl.rom1v.com/noindex/test.mpg
>
>Can you post the Ogg file you have generated?
>
>What ffmpeg2theora options did you use?
>
>> The file works correctly using vlc or mplayer, but totem has sync
>> problems for playing it.
>
>Sounds like an issue in totem; which totem version are you using?
>
>Conrad.

Any chance of a look at the original you're trying to transcode?
Nearly all sync problems are 'the transcoder is losing some critical
piece of timing information'.

Monty
Rogue Mplayer Ninja
Xiph.Org

xiphmont at xiph.org kirjoitti: 
> Any chance of a look at the original you're trying to transcode?
> Nearly all sync problems are 'the transcoder is losing some critical
> piece of timing information'.
Is it possible that the transcoder would print an error message in such cases? I
think that it is unacceptable that the transcoder silently produces erroneous
output. You just can trust such software.