x264enc encoding parameters

[Ian Davidson]

I have attached a short sample where the effect can be seen.

The feed to the computer is via a video mixer using a composite signal.  
I expect that that implies that the signal is interleaved.

Where in the pipeline would you recommend that I put the deinterlace?

Thanks.

Ian


On 23/03/2017 18:48, Tim Müller wrote:
> On Thu, 2017-03-23 at 18:28 +0000, Ian Davidson wrote:
>
> Hi David,
>
>
>> I have a C program which records a video file from a camera.
>> The video part of the pipeline (assuming that I have transcribed it
>> correctly) is
>> v4l2src ! queue ! videorate ! videoscale ! video/x-
>> raw,format=(string)I420,width=720,height=576,framerate=(fraction)25/1
>> ! queue ! videoconvert ! x264enc ! mp4mux ! filesink location=foo/bar
>> The program works fine and the degree of compression achieved by the
>> encoder is impressive. However, when there is significant movement in
>> the image, there is a very obvious 'interleave effect' which remains
>> visible for quite a while. I would be prepared to pay the cost of
>> less aggressive compression/greater file size to improve the image
>> quality.
>> I have attempted to change the behaviour of the encoder, for example
>> by setting bitrate to 6000, but I have not found anything which seems
>> to make any difference.
>> How should I go about getting better picture quality?
> It might be helpful if you put up a couple-of-second-long sample mp4
> somewhere on your website, so we can check out the exact problem.
>
> What is the device that produces this? Is it an analogue video capture
> device by any chance? Is it possible the device produces interlaced
> video? You could try adding a 'deinterlace' element to see if it makes
> a difference.
>
> Cheers
>   -Tim
>

-- 
--
Ian Davidson

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