[vlc-devel] Re: MP4 Movies that stop before they are finished

[James MacLean]

On Tue, 27 Apr 2004, James MacLean wrote:

> On Mon, 26 Apr 2004, James MacLean wrote:
> 
> > On Mon, 26 Apr 2004, Gildas Bazin wrote:
> > 
> > > On Monday 26 April 2004 19:30, James MacLean wrote:
> > > > Still doing more tests, but AVI streams are running again here,
> > > > JES
> > > Nice catch :)
> > > I just committed the patch.
> > > --
> > > Gildas
> > Mind suggesting how to find a similar problem with mp4s? This time they
> > play locally properly in 0.7.1 and latest CVS so I can not play "The Price
> > is Right"(higher, higher, lower lower ;)) game with svn :(.
> > They seem to only work over an http link if the link speed very fast... 
> > Tried all sorts of mp4s with no luck. Looked at modules/demux/mp4/mp4.c, 
> > but again, nothing jumps out at me :(.
> 
> Proved it doesn't work as far back 0.6.2. If I modify 
> modules/demux/mp4/mp4.c so that what reads :
> 
>    /* we will read 100ms for each stream so ...*/
>     p_sys->i_time += __MAX( p_sys->i_timescale / 10 , 1 );
> 
> becomes:
> 
>    /* we will read 100ms for each stream so ...*/
>     p_sys->i_time += __MAX( p_sys->i_timescale , 1 );
> 
> It will play a bit more aggressively at the start but still stall out. 
> Also, when set like this, the timeline that feeds across the viewer is 
> skewed as if it is going too fast.. Until it stops :(.
> 
> On the sessions that fail I see :
> 
> [00000424] access_http input debug: protocol 'HTTP' answer code 206
> [00000424] access_http input debug: stream size=4677245
> [00000424] access_http input debug: Content-Type: video/mp4
> [00000424] access_http input debug: trying to seek to 99927
> [00000424] main input debug: net: connecting to 'lrt.ednet.ns.ca:80'
> [00000424] main input debug: looking for network module
> [00000424] main input debug: probing 4 candidates
> [00000424] ipv4 input debug: connection in progress
> [00000047] main module debug: using network module "ipv4"
> [00000047] main module debug: unlocking module "ipv4"
> [00000430] alsa audio output warning: recovered from buffer underrun
> [00000424] access_http input debug: protocol 'HTTP' answer code 206
> [00000424] access_http input debug: stream size=4677245
> [00000424] access_http input debug: Content-Type: video/mp4
> [00000430] main audio output warning: computed PTS is out of range (4992), clearing out
> [00000430] main audio output warning: PTS is out of range (4994), dropping buffer
> [00000430] main audio output warning: output PTS is out of range (5004), clearing out
> [00000430] main audio output warning: PTS is out of range (-18126), dropping buffer
> [00000424] access_http input debug: trying to seek to 94322
> 
> You can see it if you try :
> 
> vlc http://www.ednet.ns.ca/~macleajb/MP4/yard2-320x240-200-ac3-128.mp4
> 
> I notice that the avi's don't seek, and mp4.c seems to seek quite a bit. 
> 
> Is there something in how http feeds mp4.c during demux that I should be 
> looking at? I saw a note in one of the header files that mp4 expects a 
> seekable feed... Would that be relavent for this? 
> 
> I remember that it also was stalling when getting it's feed from
> mp4live once in a while... So maybe it's not http specific.

Noticed that with --noaudio or by using a stream with no audio everything 
plays as expected. Also no repeating of :

[00000225] mp4 demuxer debug: tk=185759 mv=200000
[00000225] mp4 demuxer debug: tk=200200 mv=300000
[00000223] access_http input debug: trying to seek to 12741
[00000223] access_http input debug:           size is 32107241
[00000223] main input debug: net: connecting to 'lrt.ednet.ns.ca:80'
[00000223] main input debug: looking for network module
[00000223] main input debug: probing 2 candidates 
[00000229] main audio output warning: PTS is out of range (1140140), dropping buffer, mdate(1083376745336910), start(1083376744196771)
[00000229] main audio output warning: PTS is out of range (1117031), dropping buffer, mdate(1083376745337023), start(1083376744219993)
[00000223] ipv4 input debug: connection in progress
[00000036] main module debug: using network module "ipv4"
[00000036] main module debug: unlocking module "ipv4"
[00000223] access_http input debug: protocol 'HTTP' answer code 206
[00000223] access_http input debug: stream size=32107241
[00000223] access_http input debug: Content-Type: video/mp4

Maybe this suggests what is going on?
JES
-- 
James B. MacLean        macleajb at ednet.ns.ca
Department of Education 
Nova Scotia, Canada

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