/b32/ - Cancer moderated /b/

Sorry, here's the mp4 from youtube-dl

Ok, I'm going to start posting some guides.

>>>/a/

They have a webm thread with a lot guides and tips. They also archived all the previous ones, so if you're intersted in learning more about ffmpeg I'd suggest doing that.

>>>/webm/2573

They have a sticky with some good guides.

In an earlier thread (>>432) people were suggesting how to create webms.

>>687

Suggested Download Xilisoft Video Converter Ultimate

>>705

Suggested keepvid.com

Finally, I found this site that suggested some vp9 encoding tips.

http://wiki.webmproject.org/ffmpeg/vp9-encoding-guide

Make sure you configure shit right when you install ffmpeg. The first time I installed it I didn't enable libvpx, which didn't allow me to encode webms. Now I realized I didn't enable libopus, so I need to enable that to use this guide.

Shit's complicated.

Here's the latest thing I made. I tried a bigger file size (was 15mB in mp4 format. 720p). Turned out shit unfortunately, but I'll fuck around with it some more

In the second one I tried to control the frame rate and the bitrate by setting them to 24 and 600k respectively.

Here's another video.

This time I didn't use ffmpeg, but only youtube-dl. You can actually sometimes download a youtube video as an webm using youtube-dl (sometimes?). Here's the commands I used.

youtube-dl -F [video url]

This command allows you to see what possible formats you can download a video. You'll see a number on the very right, and if you find a format you like you can enter this command:

youtube-dl -f [number] [video url]

This gives you the video in the format you want.

I'm not sure if doing it the longer way will get you better results. If I'm not too lazy I'll try to find out more about it later.

The original video: https://youtu.be/rhXTM4Osis8

I'll still be here if anyone wants to convert anything…

come back ;_;.

Might as well use this place to put my webm tests…

It seems /b/ is being flooded with too much spam, so maybe another /b32/ will pop up.

Or maybe people will come back.

Anyways, here's one that I did with two pass encoding. I used the first instructions from http://wiki.webmproject.org/ffmpeg/vp9-encoding-guide

It doesn't play at all on VLC, but it plays well on 8chan I think

This is my first time changing the resoluion.

I didn't do a double pass. Maybe that's what fucked it up for VLC, but I'm not sure.

I might post a quick guide for anyone who happens to come back. I might post one or two more

ffmpeg -i Ness_vs_YLink.mp4 -c:v libvpx-vp9 -c:a libopus -b:v 700k -b:a 100k -s 854x480  Ness_vs_YLink4.webm

Holy shit /b/ has gone to shit.

the cancer cleaner doesn't actually clear the cancer since I think threads that don't get enough replies 404 past page 5.

He's just bumping shit down until a mod appears.

And the travis poster spamming threads, even if they're cancer, just makes them stay longer.

Those "cancerous" threads now have enough posts to not get 404d past page 5.

The pedos no longer have a subject which I find interesting.

I think someone wrote a script that'd spam their threads.

Now they can't hide from spam anymore using a script they wrote, so they have to trade I guess.

The script they wrote allowing people to hide their threads also won't work, so now we have to see their shit.

Still a shit ton of roll threads too.

Anyways, I really like how this one turned out quality wise. It's because it's so short.

I made another one before that was around 6MB. It looked good except for certain elements such as the fire.

A lot of times ffmpeg overshoots the bitrate, but this time it undershot it.

ffmpeg -i Mario_vs_Luigi_TAS.mp4 -c:v libvpx-vp9 -c:a libopus -b:v 2000k -b:a 96k Mario_vs_Luigi2.webm

I encoded another TAS fight, but it's quality is pretty shit compared to the original. The original had a much bigger filesize though. This was only 13MB, while the other is in the 50MB range.

There's another video I want to try. It's in the 50MB range too, but if I leave out the credits I might reduce the filesize by a lot.

The flash version of it manages to be only 13MB…

I've made many more videos since then, but here's one that's something different.

This one I made from a loop of a gif and soundtrack.

This was during the time they banned multiple streams for ffmpeg.

I tried making a couple with different video streams and audio streams. They're kinda difficult.

I can't show them, which sucks

This is what I think the input is. You have to loop the gif indefinitely and end the video once the song ends…

ffmpeg -ignore_loop 0 -i vinput3.gif -i ainput4.mp3 -c:a libopus -c:v libvpx-vp9 -b:a 144k -shortest output.webm

I think it turned out alright.

The next thing I want to do is find out how to turn swf files into flash files.

I think it's possible, since I've seen many swf files somewhere else and the same video on youtube.

Maybe I'll ask some /tech/ies

I might start posting my shit somewhere else soon

It's nice to see people posting here, even though it'll only be a little bit.

Guess I'll continue giving shitty advice.

Just encoded this: it was just under 29MB. Here's the code:

ffmpeg -i amazo.mp4 -c:v libvpx-vp9 -b:v 450k  -an -f webm -pass 1 /dev/null
ffmpeg -i amazo.mp4 -c:v libvpx-vp9 -b:v 450k -c:a libopus -b:a 64k -f webm -pass 2 -auto-alt-ref 1 -lag-in-frames 25 amazo.webm

- auto-alt-ref allows it to use alternate reference frames.

- lag-in-frames: Set number of frames to look ahead for frametype and ratecontrol.

Basically I think the way it works is that when vp9 goes to another to encode, it'll might just look at the changes from a previous frame and use that as a reference.

auto-alt-ref allows for that to happen, which is useful in animation when you have repeated loops of animation.

lag-in-frames changes the number of previous frames you are allowed to look to look at for reference frames.

Setting it high greatly increases the encoding time, so logicallyit should lead to a lower file size.

I actually heard it increases quality, but I honestly don't see how it does that, unless I have a completely wrong understanding, so take this with a grain of salt.

If anyone who comes to this dead board has any idea of how the fuck this works, please share a link