hard to decode video to decklink output

[Federico Allegretti]

hello, searching the net, seeking a way to playback my digital video files
out of a black magic video card (i got an intensity pro),  i found this
pipeline to work for most of my video files:
gst-launch-1.0 uridecodebin
uri=file:///mnt/nas/postion/of/th/file.extenision name=decode decode. !
interlace field-pattern=1 ! videoconvert ! video/x-raw,format=UYVY !
videoscale ! video/x-raw,width=720,height=576 ! videorate !
video/x-raw,framerate=25/1 ! decklinkvideosink mode=3 decode. !
audioconvert ! decklinkaudiosink

PS: mode=3 stands for PAL SD 50i as i whant the card to play content out of
the composite cideo connector.

This works quite well, but with some file  playback do not occours.

for example, with a file shot by cell phone i got no problem (those are
stats by ffmpeg):
h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720, 13976
kb/s, SAR 1:1 DAR 16:9, 15.03 fps, 15 tbr, 90k tbn, 180k tbc (default)
Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 156 kb/s
(default)

but with another edited with pinnacle studio (stats by ffmpeg):
Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR
1:1 DAR 16:9], 2024 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s
(default)

i got this error:

ERRORE: dall'elemento
/GstPipeline:pipeline0/GstURIDecodeBin:decode/GstDecodeBin:decodebin0/GstQTDemux:qtdemux0:
Internal data stream error.
Informazioni di debug aggiuntive:
qtdemux.c(6073): gst_qtdemux_loop ():
/GstPipeline:pipeline0/GstURIDecodeBin:decode/GstDecodeBin:decodebin0/GstQTDemux:qtdemux0:
streaming stopped, reason not-negotiated (-4)
ERRORE: la pipeline non vuole fare il preroll.
Impostazione della pipeline a NULL ...
Esecuzione di free sulla pipeline...

I suppose that the problem could be the samplerate, so i resampled the
audio in this way:
ffmpeg -i grand_prix_casagrande.mp4 -vcodec copy -acodec aac -ar 48000 -ab
128000 -ac 2 grand_prix_casagrande_48.mp4

and now the new file could be played back.

My question now is: There is a way to make the resample AT RUNTIME (and
maybe only if needed)?

Thanks a lot,

Federico

-- 
Sourceforge: https://sourceforge.net/u/allegfede/

YouTube Channel: https://www.youtube.com/c/v1p3rslab

VIMEO HD videos: http://www.vimeo.com/user1912745/videos
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