[FFmpeg-user] Blackmagic card issue capturing

Christian Bianchini max246 at gmail.com
Wed Mar 2 12:03:20 CET 2016


I have ran with log level and this is the result when it successfully
capture at 60 FPS:

frame=  153 fps= 61 q=0.0 size=   51752kB time=00:00:02.33
bitrate=181487.1kbits
dshow passing through packet of type video size  4147200 timestamp 26343746
orig
 timestamp 26078449 graph timestamp 26343718 diff 265269 Decklink Video
Capture
dshow passing through packet of type video size  4147200 timestamp 26509532
orig
 timestamp 26245282 graph timestamp 26509509 diff 264227 Decklink Video
Capture
ap

This is when it fails


frame=    2 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A
dup=0 dro
dshow passing through packet of type video size  4147200 timestamp
7165437108888
73 orig timestamp 716543716327540 graph timestamp 716543710888873 diff
-5438667
Decklink Video Capture
*** dropping frame 2 from stream 0 at ts 0
dshow passing through packet of type video size  4147200 timestamp
7165437108888
73 orig timestamp 716543716494373 graph timestamp 716543710888873 diff
-5605500
Decklink Video Capture
*** dropping frame 2 from stream 0 at ts 0
dshow passing through packet of type video size  4147200 timestamp
7165437108888
73 orig timestamp 716543716661206 graph timestamp 716543710888873 diff
-5772333
Decklink Video Capture
*** dropping frame 2 from stream 0 at ts 0
dshow passing through packet of type video size  4147200 timestamp
7165437108888
73 orig timestamp 716543716828040 graph timestamp 716543710888873 diff
-5939167
Decklink Video Capture


Does it makes any sense? is this the capture card failure?


On 1 March 2016 at 19:53, Roger Pack <rogerdpack2 at gmail.com> wrote:

> On 3/1/16, Christian Bianchini <christian.bianchini at euservers.net> wrote:
> > I have got the ffmpeg version N-78598-g98a0053  and trying to capturing
> > from a Blackmagic card, which sometimes works and sometimes doesnt.
> >
> > ffmpeg.exe -y -f dshow -video_size 1920x1080 -pixel_format uyvy422
> > -rtbufsize 2100 -framerate 59.94 -i "video=Decklink Video Capture"
> -codec:v
> > libx264 -preset ultrafast -an -crf 0 test.mkv
> >
> > The issue is a not recording at 60 FPS but at  0.. 2...1.3.....0.. and
> the
> > file doesnt get big.
> >
> > After I stop and restart the process, it captures at 60FPS without issues
> > and the video is great, but I dont get why I need to restart 3-4 times to
> > get the record working.
> >
> >
> > this the output that I get when it doesnt work:
>
> Appears to not be receiving input.  If you wait awhile it never works?
> What if you add -loglevel verbose (to the failing runs)?
> Unfortunately nothing comes to mind...
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-- 
---------------------------
Hardware & Software Developer
christian at bianchini.ch <christian at biachini.ch>
www.max246.ch


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