[FFmpeg-user] SPAM-HIGH: Re: FFmpeg connecting to DVB-T system has cropping

[Anubis]

Hi Roger,

If I capture to a file, there's no cropping, it displays as normal, same as
if I view the stream in VLC.

Removing the aspect doesn't seem to make any difference I'm afraid; although
the aspect should be implied by the -s specification.

I was more wondering if there was some kind of specification in DVB-T which
stated that the picture would have a border of sorts that's not shown on
screens; doesn't really make sense, but just coming up with ideas.

Thanks.
Anubis.



-----Original Message-----
From: ffmpeg-user-bounces at ffmpeg.org [mailto:ffmpeg-user-bounces at ffmpeg.org]
On Behalf Of Roger Pack
Sent: Wednesday, 4 February 2015 7:46 AM
To: FFmpeg user questions
Subject: SPAM-HIGH: Re: [FFmpeg-user] FFmpeg connecting to DVB-T system has
cropping

What if you just capture to a file, is it cropped? What if you leave out
aspect ratio [shouldn't that be 1:1?]

On 2/2/15, Anubis <anubis at iwwd.com> wrote:
> Hi All,
>
> I'm trying to get a h264 stream setup between a server we use to 
> produce a local content channel and our DVB-T2 h264 compatible TV 
> distribution system.
> I've got the stream being picked up by the TV system (albeit a bit 
> poor quality at this stage) but my main issue is that the picture is 
> being cropped, as if it's too large to fit in the screen.
>
> The resolution on the server is 1920x1080 and the stream is setup with 
> the following parameters:
>
> ffmpeg ^
>  -f dshow -i video="screen-capture-recorder" ^  -f dshow -i 
> audio="Stereo Mix (Realtek High Definition Audio)" ^  ^  -c:v libx264 
> ^  -tune zerolatency ^  -preset:v veryfast ^  -x264opts
> bitrate=4000:vbv-maxrate=4000:vbv-bufsize=3000:ratetol=200:vbv-init=20
> 0 ^  -pix_fmt yuv420p ^  -bf 3 ^  -b_strategy 1 ^  -profile:v high ^  
> -level:v 4.1 ^  -r 25.00 ^  -g 25 ^  -s 1920x1080 ^  -aspect 16:9 ^  
> -b:v 4M ^  -minrate 4M ^  -maxrate 4M ^  -bufsize 2M ^  ^  -c:a 
> libmp3lame ^  -b:a 256k^  -ar 44100 ^  -ac 2^  -threads 0 ^  -streamid 
> 0:430 ^  -streamid 1:446 ^  ^  -f mpegts ^
>  udp://224.2.2.70:5000?localaddr=192.168.5.70^&pkt_size=1316
>
>
> Is there something that I've misconfigured which would make the 
> picture seem cropped or zoomed in?  I've checked on a number of 
> different TV's but all display the same.
>
> Also, I need to try and keep the channel to a max of 4Mbps; are the 
> settings I have here the best quality I could get out of the picture 
> while keeping within 4Mbps?
>
>
> Thanks
> Anubis.
>
>
>
>
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> ffmpeg-user at ffmpeg.org
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>
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