ExtraOptions with x264

[agkatare30]

Hi,

I'm trying to ingest the interlaced stream using RTMP, and the HLS ABR playback was completely fine. As per the transcoder settings I configured multiple bitrates. But later I realised that the output .ts chunks are in progressive. This explains that by default the transcoded output is in progressive. My requirement was to ingest an interlaced video and get a transcoded output chunks as well in interlaced form.
I explored a code little bit I got to know that I can use the tag along with x264. I modified the

<Video>
	<Name>8MB</Name>
	<Codec>h264</Codec>
	<Bitrate>8000000</Bitrate>
	<Profile>high</Profile>
	<Modules>x264</Modules>
	<ExtraOptions>tff=1:weightp=0</ExtraOptions>
</Video>

I added tag to specify that I need to use x264, and mentioned 'tff=1:weightp=0' (Top Field First) in the .
With this setting I was able to get the output .ts chunks in the interlaced form, but when I check the .ts chunk using ffprobe it says as 'Bottom First'.
This is where I'm not able to understand, even when I explicitly mentioned 'tff=1', why the output .ts chunks has 'Bottom first'. I tried modifying the tag to 'bff=1' and still the output .ts chunks has 'Bottom first'.
The input is not the problem because I have verified that the input is interlaced and has 'Top First'.

Can someone please help to understand if this is some kind of bug?
I'm on the latest release and is using on Mac Apple chip using docker image.

@getroot can you please help 🙏

-Thanks,
Akshay Katare

[Keukhan]

@agkatare30

Thanks for reporting this. Currently, OvenMediaEngine does not support interlaced encoding. I also confirmed that even when applying the tff=1 option in ExtraOptions, it is automatically reset to BFF by the x264 codec.

I’ll make sure to include interlaced encoding support in our development plan.

Thanks.

[agkatare30]

@Keukhan
Thank you for your reply!
I really look forward to see it supported in upcoming releases.
For now can we consider this as a bug and track it further for the fix?
Would like to know ahead from you.

Thanks.