Pipe command help

Lisa White

Hey guys, I am looking for a pipe command to transcode an m3u mux to 1080 with ffmpeg. I found a few pipe examples but none of them transcoded to 1080. Any suggestions?

Thank You
Lisa

Saen Acro

More details examples?

Lisa White

Saen, I tried this particular pipe that I found within one of the members post.

(pipe:///usr/bin/ffmpeg -reconnect 1 -reconnect_at_eof 1 -reconnect_streamed 1 -reconnect_delay_max 2000 -probesize 1000k -analyzeduration 0 -fpsprobesize 0 -fflags -nobuffer -err_detect ignore_err -i http://myfavoroiteiptvwith720broadcast.m3u -codec copy -f mpegts -tune zerolatency pipe:1)

This particular mux is being broadcasted at 720p by the provider and I wanted to know if ffmpeg can transcode it to 1080p. I was fooling with nextpvr and that software can perform this function if I changed the transcoding in the software itself and the Kodi addon.

I was wondering if this can by done with piping within tvheadend and how would I do it.

Thanks
Lisa

Saen Acro

So you want toupscale 720p to 1080p with is transcoding
with will destroy quality ann add some artifacts also will use more resources

TV can do this better with his dedicated SOC teling kodi to change resolution.

/Use PRE co citate commands/


pipe:///usr/bin/ffmpeg -reconnect 1 -reconnect_at_eof 1 -reconnect_streamed 1 -reconnect_delay_max 2000 \
-probesize 1000k -analyzeduration 0 -fpsprobesize 0 -fflags -nobuffer -err_detect ignore_err \
-i http://myfavoroiteiptvwith720broadcast.m3u -codec copy -f mpegts -tune zerolatency pipe:1

this just guaranty reconect to stream

Hiro Protagonist

Lisa White wrote:

> I found a few pipe examples but none of them transcoded to 1080.

There's a reason for that.

Although you can transcode from a lower to a higher resolution, there's little point in dong so - you'll just degrade quality.

I'd only consider doing that if I had a device that was unable to display the lower resolution.

Lisa White

Ok Thank you for all your input. I was just mesmerized when I seen the video quality transcode using nextpvr. Thanks again!!

Saen Acro

Lisa White wrote:

> Ok Thank you for all your input. I was just mesmerized when I seen the video quality transcode using nextpvr. Thanks again!!

downscaling 1080p (1920x1080)> 480p (852x480), makes a square of size 4 by 4 pixels with is 16 pixels new with a size of 1 pixel with average color neibhour contrast etc.
upscaling on oposite direction from 1 pixel to make 16 pixels with hevy bluring result
https://www.red.com/red-101/upscaled-1080P-vs-4K expected

https://s3.amazonaws.com/red_3/uploads/asset_image/image/519e53a226465a2df5001594/upscale-diagram4.png
reality

https://s3.amazonaws.com/red_3/uploads/asset_image/image/519e539f2f74a92b52000735/upscale-diagram3.png
missing pixels comes at a cost; all methods incur some combination of blurring, blocking and halo artifacts

https://s3.amazonaws.com/red_3/uploads/asset_image/image/513e306b26465a7900000f6d/upscale-artifacts.png
some extra
https://www.red.com/red-101/eyesight-4k-resolution-viewing