Gst-launch-1.0 (v1.80) Decklink Interlaced Video

[Dave Johnstone]

The video is decoded as:

video/x-raw format: Y42Bwidth: 720 height: 576 interlace-mode: mixed 
pixel-aspect-ratio: 16/15chroma-site: dv colorimetry: bt601 framerate: 25/1

The interlace mode is detected as 'mixed' not 'interleaved'.  The 
pipeline errors with 'general stream error, reason: not-negotiated'.

I can't test the audio just now but the GStreamer version is 1.8 from 
the pre-compiled OSX packages, the decklink plugin is dated 2016-03-24.



On 23/05/2016 5:27 PM, Sebastian Dröge wrote:
> On Fr, 2016-05-20 at 21:30 +0930, Dave Johnstone wrote:
>> Hi,
>>
>> I am trying to play an SD interlaced file out on a Blackmagic Decklink card but having troubles.  I cannot get the following pipeline to link -
>> gst-launch-1.0 uridecodebin uri=file:///Volumes/Video/race.mov ! autovideoconvert ! decklinkvideosink mode=3
>> If I deinterlace then interlace with
>>
>> uridecodebin uri=file:///Volumes/Video/race.mov ! deinterlace ! autovideoconvert ! interlace field-pattern=2:2 ! videoscale ! videorate ! decklinkvideosink mode=3
>>
>> This works but if I add audio
> What are the caps the decoder is outputting? Is it marked as
> interlaced, why does linking fail exactly? That is, how are the caps
> incompatible?
>
>> uridecodebin uri=file:///Volumes/Video/race.mov name=decoder decoder. ! deinterlace ! autovideoconvert ! interlace field-pattern=2:2 ! videoscale ! videorate ! decklinkvideosink mode=3 decoder. ! audioconvert ! decklinkaudiosink
>>
>> The audio plays at the correct speed and pitch but stutters as if half the samples are missing.
> If you let the video go to a fakesink, and add a videotestsrc in front
> of decklinkvideosink, is the audio still stuttering? Is the audio also
> stuttering with other audio sinks?
>
> Which version of GStreamer and the decklink plugin are you using?
>
>> What is the correct pipeline for playing interlaced files to a Decklink card in interlaced mode?
> You should be able to pass through the interlaced video without
> deinterlacing/interlacing, assuming that it is correctly detected as
> interlaced content and the resolution and framerate is correct.
>
>> As for HD, even the above trick does not work.
> How does HD fail even more?
>
>
>
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