[FFmpeg-user] Capture Video from Decklink Video Render

Tue Dec 11 12:39:25 CET 2012

Carl .,  i just meant it is throwing an exception didn't mean that it is an
issue with FFMPEG .. I am too Pro FFMPEG  FAN :)

now I am using the below mentioned command to capture DV in .MXF format.

D:\SOFTWARE\ffmpeg\bin>ffmpeg -f dshow -i video="Decklink Video
Capture":audio="
Decklink Audio Capture" -vcodec dvvideo -pix_fmt yuv411p -t 10 -metadata
creatio
n_time="2012-12-11 11:00:00"  -f mxf -y output.mxf
ffmpeg version N-45279-g1a104bf Copyright (c) 2000-2012 the FFmpeg
developers
  built on Oct 10 2012 19:19:16 with gcc 4.7.2 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-pthreads
--enable-runt
ime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r
--enable-libass -
-enable-libcelt --enable-libopencore-amrnb --enable-libopencore-amrwb
--enable-l
ibfreetype --enable-libgsm --enable-libmp3lame --enable-libnut
--enable-libopenj
peg --enable-librtmp --enable-libschroedinger --enable-libspeex
--enable-libtheo
ra --enable-libutvideo --enable-libvo-aacenc --enable-libvo-amrwbenc
--enable-li
bvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid
--ena
ble-zlib
  libavutil      51. 74.100 / 51. 74.100
  libavcodec     54. 65.100 / 54. 65.100
  libavformat    54. 31.100 / 54. 31.100
  libavdevice    54.  3.100 / 54.  3.100
  libavfilter     3. 19.102 /  3. 19.102
  libswscale      2.  1.101 /  2.  1.101
  libswresample   0. 16.100 /  0. 16.100
  libpostproc    52.  1.100 / 52.  1.100
[dshow @ 003cb280] Estimating duration from bitrate, this may be inaccurate
Guessed Channel Layout for  Input Stream #0.1 : stereo
Input #0, dshow, from 'video=Decklink Video Capture:audio=Decklink Audio
Capture
':
  Duration: N/A, start: 2695.931000, bitrate: 1536 kb/s
    Stream #0:0: Video: rawvideo (UYVY / 0x59565955), uyvy422, 720x576, 25
tbr,
10000k tbn, 25 tbc
    Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Output #0, mxf, to 'output.mxf':
  Metadata:
    creation_time   : 2012-12-11 11:00:00
    encoder         : Lavf54.31.100
    Stream #0:0: Video: dvvideo, yuv411p, 720x576, q=2-31, 200 kb/s, 25
tbn, 25
tbc
    Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo -> dvvideo)
  Stream #0:1 -> #0:1 (pcm_s16le -> pcm_s16le)
Press [q] to stop, [?] for help
frame=   17 fps=0.0 q=0.0 size=    2098kB time=00:00:00.68
bitrate=25275.0kbits/
frame=   30 fps= 30 q=0.0 size=    3892kB time=00:00:01.20
bitrate=26569.5kbits/
frame=   42 fps= 28 q=0.0 size=    5985kB time=00:00:01.68
bitrate=29184.1kbits/
frame=   55 fps= 27 q=0.0 size=    7779kB time=00:00:02.20
bitrate=28966.2kbits/
frame=   68 fps= 27 q=0.0 size=    9573kB time=00:00:02.72
bitrate=28831.7kbits/
frame=   80 fps= 26 q=0.0 size=   11517kB time=00:00:03.20
bitrate=29482.3kbits/
frame=   93 fps= 26 q=0.0 size=   13311kB time=00:00:03.72
bitrate=29311.8kbits/
frame=  105 fps= 26 q=0.0 size=   15404kB time=00:00:04.20
bitrate=30044.2kbits/
frame=  118 fps= 26 q=0.0 size=   17198kB time=00:00:04.72
bitrate=29847.9kbits/
frame=  131 fps= 26 q=0.0 size=   18992kB time=00:00:05.24
bitrate=29690.6kbits/
frame=  143 fps= 26 q=0.0 size=   20935kB time=00:00:05.72
bitrate=29982.5kbits/
frame=  156 fps= 26 q=0.0 size=   22879kB time=00:00:06.24
bitrate=30035.4kbits/
frame=  169 fps= 26 q=0.0 size=   24673kB time=00:00:06.76
bitrate=29899.0kbits/
frame=  181 fps= 26 q=0.0 size=   26616kB time=00:00:07.24
bitrate=30115.8kbits/
frame=  194 fps= 26 q=0.0 size=   28560kB time=00:00:07.76
bitrate=30149.4kbits/
frame=  206 fps= 26 q=0.0 size=   30354kB time=00:00:08.24
bitrate=30176.7kbits/
frame=  219 fps= 26 q=0.0 size=   32297kB time=00:00:08.76
bitrate=30202.9kbits/
frame=  232 fps= 26 q=0.0 size=   34241kB time=00:00:09.28
bitrate=30226.1kbits/
frame=  244 fps= 25 q=0.0 size=   36035kB time=00:00:09.76
bitrate=30245.4kbits/
frame=  250 fps= 25 q=0.0 Lsize=   37381kB time=00:00:10.00
bitrate=30622.6kbits
/s dup=3 drop=0
video:35156kB audio:1875kB subtitle:0 global headers:0kB muxing overhead
0.94459
1%

i assume i am still missing something because the output.mxf has stokes /
jitter issue. Also possibly 1 or 2 frames audio / Video Sync out issue . my
editor is loading the file in Avid to check the output on the broadcast
monitor.

Regards

On Tue, Dec 11, 2012 at 3:34 PM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:

> Yugant Khanna <yugant <at> gmail.com> writes:
>
> > D:\SOFTWARE\ffmpeg\bin>ffmpeg -ss 20 -t 15 -i
> > "C:\Users\Developer\Documents\Untitled 01.avi"
> > -vcodec copy -acodec copy -y testMjpeg.avi
>
> Note that -t is not an input option.
>
> [...]
>
> > C:\Users\Developer\Documents\Untitled 01.avi: Permission denied.
>
> If there is any software that reads your file
> but FFmpeg does not, please provide the sample.
>
> Please do not top-post on this mailing list,
> it is considered rude.
>
> Carl Eugen
>
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