[FFmpeg-user] Shift videoframe for 1 pixel in vertical to change field order

[Christoph Gerstbauer]

Hello,

how can I shift a videoframe 1 pixel up or down (to change the field order)?

Best Regards

Christoph

___
ffmpeg-user mailing list
ffmpeg-user@ffmpeg.org
http://ffmpeg.org/mailman/listinfo/ffmpeg-user

To unsubscribe, visit link above, or email
ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".

Re: [FFmpeg-user] How to livestream from youtube video link

[Moritz Barsnick]

On Wed, Aug 23, 2017 at 21:16:57 -0700, johnsmithbin wrote:
> Hello.
> I want livestream from youtube video link. I tried using /youtube-dl
> https://www.youtube.com/watch?v=mosPaiR-nrs -g/ but the link returned is not
> a direct link. How can you help me?

The general issue is that some YouTube formats come as two separate
streams. You can check what youtube-dl can discover by calling
$ youtube-dl -F https://www.youtube.com/watch?v=mosPaiR-nrs

I think the issue with youtube-dl is it claims the composite MP4 format
is "best":
> [...]
> 22   mp41280x720   hd720 , avc1.64001F, mp4a.40.2@192k (best)

but when using "-g", it doesn't deliver that best format, but two other
URLs for a separate video and audio stream each. Note that, for this
particular clip, there's no composite video+audio format available from
YouTube with the highest resolution of 1920x1080.

You could do
$ ffmpeg -i $(youtube-dl -f "bestvideo" -g 
https://www.youtube.com/watch?v=mosPaiR-nrs) -i $(youtube-dl -f "bestaudio" -g 
https://www.youtube.com/watch?v=mosPaiR-nrs) -map 0:v -map 1:a [...]

I believe I have done that and it worked. You may want to query those
URLs first, put them in variables, and then hand these variables to ffmpeg.

Note that, depending on what codecs your livestream requires, you might
need to reencode, as YouTube likes delivering VP9 video and Opus audio,
which may or may not suit your needs. Otherwise, use
"bestvideo[ext=mp4]" and "bestaudio[ext=m4a]", if you prefer H.264 and
AAC.

Good luck,
Moritz
___
ffmpeg-user mailing list
ffmpeg-user@ffmpeg.org
http://ffmpeg.org/mailman/listinfo/ffmpeg-user

To unsubscribe, visit link above, or email
ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".

Re: [FFmpeg-user] An up to date guide to compile ffmpeg with nvidia hardware acceleration?

[Evert Vorster]

Hi there.

Arch Linux user repository builds a version of ffmpeg that has the nvenc
along with the kitchen sink.
https://aur.archlinux.org/packages/ffmpeg-full-nvenc/

It may help you a little in your quest.
-Evert-

On 4 September 2017 at 10:29, Xavier Seignard 
wrote:

> Hello there,
>
> I'm looking to compile ffmpeg with nvidia hardware acceleration.
>
> So I found the following guide on nvidia website:
> http://developer.download.nvidia.com/compute/redist/
> ffmpeg/1511-patch/FFMPEG-with-NVIDIA-Acceleration-on-Ubuntu_UG_v01.pdf
>
> But it is almost 2 years old, so my question is to know whether or not,
> this guide is still up to date or not?
>
> Regards,
>
> Xavier
>
> --
> var contact = {
> name: 'Xavier Seignard',
> phone: '06 83 03 73 74',
> website: 'http://drangies.fr',
> twitter: 'https://twitter.com/xavier_seignard'
> };
> ___
> ffmpeg-user mailing list
> ffmpeg-user@ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
> To unsubscribe, visit link above, or email
> ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".




-- 
Evert Vorster
Isometrix Acquistion Superchief
___
ffmpeg-user mailing list
ffmpeg-user@ffmpeg.org
http://ffmpeg.org/mailman/listinfo/ffmpeg-user

To unsubscribe, visit link above, or email
ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".

[FFmpeg-user] An up to date guide to compile ffmpeg with nvidia hardware acceleration?

[Xavier Seignard]

Hello there,

I'm looking to compile ffmpeg with nvidia hardware acceleration.

So I found the following guide on nvidia website:
http://developer.download.nvidia.com/compute/redist/ffmpeg/1511-patch/FFMPEG-with-NVIDIA-Acceleration-on-Ubuntu_UG_v01.pdf

But it is almost 2 years old, so my question is to know whether or not,
this guide is still up to date or not?

Regards,

Xavier

-- 
var contact = {
name: 'Xavier Seignard',
phone: '06 83 03 73 74',
website: 'http://drangies.fr',
twitter: 'https://twitter.com/xavier_seignard'
};
___
ffmpeg-user mailing list
ffmpeg-user@ffmpeg.org
http://ffmpeg.org/mailman/listinfo/ffmpeg-user

To unsubscribe, visit link above, or email
ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".