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

[Anubis]

Hi Robin,

Ah yes, it does indeed seem to explain what's going on; thank you for that.

Thanks.
Anubis.



-----Original Message-----
From: ffmpeg-user-bounces at ffmpeg.org [mailto:ffmpeg-user-bounces at ffmpeg.org]
On Behalf Of Robin Theissen
Sent: Wednesday, 4 February 2015 9:07 AM
To: FFmpeg user questions
Subject: Re: [FFmpeg-user] SPAM-HIGH: Re: FFmpeg connecting to DVB-T system
has cropping

Most TV Sets especially older ones do crop a bit. Look into title safe/
action safe and see if that explains Your problems

Robin 

Von meinem iPhone gesendet

> Am 03 Feb 2015 um 22:26 schrieb "Anubis" <anubis at iwwd.com>:
> 
> 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=2
>> 0
>> 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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