[vlc-devel] Re: Dropped frames

[Damien Fouilleul]

it sounds like there might be problem with frame timestamping out of the 
capture card, you should check the timestamps (pts) you are getting in 
dshow Demux() functions

Dugal Harris wrote:
> Hello
>
> I am compiling the latest SVN code with Cygwin - gcc 3.4.4.  I follow 
> the instructions in http://wiki.videolan.org/Win32CompileCygwin.  I 
> cannot play video from files or capture devices, frames seemingly 
> arrive late and are dropped.  I get the following messages when trying 
> to play back a file (my computer is definitely not too slow).
> main debug: looking for decoder module: 26 candidates
> ffmpeg debug: libavcodec initialized (interface 3348736 )
> ffmpeg debug: postprocessing disabled
> ffmpeg debug: using direct rendering
> ffmpeg debug: ffmpeg codec (MPEG-4 Video) started
> main debug: using decoder module "ffmpeg"
> main debug: thread 4752 (decoder) created at priority 0 
> (input/decoder.c:172)
> main debug: `D:\Data\Videos\Vehicles\Source\Jules1.avi' successfully 
> opened
> avi debug: old:0 < new 0
> main debug: no usable vout present, spawning one
> main debug: window size: 352x288
> main debug: looking for video output module: 6 candidates
> vout_directx debug: creating DirectXEventThread
> main debug: waiting for thread completion
> vout_directx debug: DirectXCreateWindow
> vout_directx debug: created video sub-window
> main debug: thread 4784 (DirectX Events Thread) created at priority 0 
> (directx.c:279)
> vout_directx debug: DirectXEventThread running
> vout_directx debug: DirectXInitDDraw
> vout_directx debug: directx-device:
> vout_directx debug: DirectXEnumCallback: Primary Display Driver, display
> vout_directx debug: screen dimensions (0x0,1280x1024)
> vout_directx debug: DirectDraw Capabilities: overlay=1 yuvoverlay=1 
> can_deinterlace_overlay=1 colorkey=1 stretch=1 bltfourcc=1
> vout_directx debug: align_boundary_src=0,0 align_boundary_dest=1,1 
> align_size_src=0,0 align_size_dest=0,0
> vout_directx debug: End DirectXInitDDraw
> vout_directx debug: DirectXCreateDisplay
> vout_directx debug: DirectXCreateClipper
> vout_directx debug: disabling screen saver
> main debug: using video output module "vout_directx"
> main debug: waiting for thread completion
> vout_directx debug: NewPictureVec overlay:yes chroma:YV12
> vout_directx debug: YUV overlay created successfully
> vout_directx debug: End NewPictureVec (succeeded)
> main debug: got 1 direct buffer(s)
> main debug: picture in 352x288 (0,0,352x288), chroma I420, ar 11:9, 
> sar 1:1
> main debug: picture user 352x288 (0,0,352x288), chroma I420, ar 11:9, 
> sar 1:1
> main debug: picture out 352x288 (0,0,352x288), chroma I420, ar 11:9, 
> sar 1:1
> main debug: direct render, mapping render pictures 0-6 to system 
> pictures 1-7
> main debug: thread 4852 (video output) created at priority 1 
> (video_output/video_output.c:448)
> ffmpeg warning: frame skip 8
> (mpeg4 at 00BD9A40)
> ffmpeg warning: frame skip 8
> (mpeg4 at 00BD9A40)
> ffmpeg error: more than 5 seconds of late video -> dropping frame 
> (computer too slow ?)
> ffmpeg error: more than 5 seconds of late video -> dropping frame 
> (computer too slow ?)
> ffmpeg error: more than 5 seconds of late video -> dropping frame 
> (computer too slow ?)
> main warning: late picture skipped (57432302681973000)
> main warning: late picture skipped (57492432224077000)
> main warning: late picture skipped (57543971831589000)
> main warning: late picture skipped (57612691308245000)
> main warning: late picture skipped (57677115817645000)
> avi warning: cannot skip packet, track disabled
> ffmpeg debug: ffmpeg codec (MPEG-4 Video) stopped
> main debug: removing module "ffmpeg"
> main debug: thread times: real 0m0.312500s, kernel 0m0.015625s, user 
> 0m0.015625s
> main debug: thread 4752 joined (input/decoder.c:204)
> main debug: killing decoder fourcc `XVID', 4310 PES in FIFO
> main debug: EOF reached
>
> What am I doing wrong?
>
> Thanks
> Dugal
>

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