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FFmpeg 6.0

ffmpeg.org

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Re: FFmpeg 6.0

#41

Post by nicky0 »

xbmcuser wrote: post #23
arjvik wrote: post #16

I absolutely love ffmpeg, but for the life of me I cannot understand how its pipeline system works. Each time I need to use it, I attempt to construct the command myself, but end up giving up and consulting StackOverflow. Amazingly, someone has usually done the exact thing I need to do and posted their command line to StackOverflow, so I'm never out of luck! How do I actually start understanding how ffmpeg works? I w…

I know a lot of people look down on ChatGpt. But I have been using it for creating scripts to use with ffmpeg and I was able to get most of the things that I needed with very little massaging required. You can then ask ChatGpt about what it did and why so it will explain it as well so you can get some basic understanding on how things work. People don't realise what kind of tool Chat Gpt is and how to properly utilis…

Yes, chat GPT excels at comprehending and explaining things that have a consistent structure, restructuring, and and synthesising variations. If you keep it in its lane, it’s an excellent tool.

It’s really really bad at counting though. For example, try asking it to produce a line of 40 asterisks.

Re: FFmpeg 6.0

#42

Post by shmerl »

komali2 wrote: post #40
shmerl wrote: post #8

Earlier quoted context omitted.

Google must be using it for Youtube. Wikimedia is using it as well.

They do, they say so here: https://support.google.com/youtube/answer/1722171#zippy=%2Cc... > YouTube does not recommend the RGB color matrix on uploads. In this case, YouTube initially sets the color matrix to unspecified before the standardization. It will then infer the color matrix using the color primaries during standardization. Note that sRGB TRC will convert to BT.709 TRC. YouTube re-tags the color primaries/m…

Interesting, thanks for the pointer!

Re: FFmpeg 6.0

#43

Post by gamegoblin »

nicky0 wrote: post #41
xbmcuser wrote: post #23

Earlier quoted context omitted.

I know a lot of people look down on ChatGpt. But I have been using it for creating scripts to use with ffmpeg and I was able to get most of the things that I needed with very little massaging required. You can then ask ChatGpt about what it did and why so it will explain it as well so you can get some basic understanding on how things work. People don't realise what kind of tool Chat Gpt is and how to properly utilis…

Yes, chat GPT excels at comprehending and explaining things that have a consistent structure, restructuring, and and synthesising variations. If you keep it in its lane, it’s an excellent tool. It’s really really bad at counting though. For example, try asking it to produce a line of 40 asterisks.

It’s bad at counting because counting relies on a stateful O(N) algorithm you run in your brain.

GPT is trained to reproduce human text, which tends to simply have the output of this O(N) counting process, but not the process itself. So GPT “thinks” it should be able to just spit out the number just like human text implies we do. It doesn’t know we are relying on an offline O(N) algorithm.

If you have it emit a numbered list of 40 elements, it will succeed, because producing a numbered list embeds the O(N) process and state into the text, which is the only thing it can see and reason about.

Re: FFmpeg 6.0

#44

Post by amadvance »

xbmcuser wrote: post #23
arjvik wrote: post #16

I absolutely love ffmpeg, but for the life of me I cannot understand how its pipeline system works. Each time I need to use it, I attempt to construct the command myself, but end up giving up and consulting StackOverflow. Amazingly, someone has usually done the exact thing I need to do and posted their command line to StackOverflow, so I'm never out of luck! How do I actually start understanding how ffmpeg works? I w…

I know a lot of people look down on ChatGpt. But I have been using it for creating scripts to use with ffmpeg and I was able to get most of the things that I needed with very little massaging required. You can then ask ChatGpt about what it did and why so it will explain it as well so you can get some basic understanding on how things work. People don't realise what kind of tool Chat Gpt is and how to properly utilis…

It really works! With few interactions, ChatGPT was able to create a not so obvious -filter_complex pipeline, like:

  ffmpeg -ss 00:01:00 -t 00:02:00 -i input1.mp4 -ss 00:03:00 -t 00:02:30 -i input2.mp4 -filter_complex "[0:v][0:a][1:v][1:a]concat=n=2:v=1:a=1[v][a];[v]eq=brightness=0.3[outv]" -map "[outv]" output.mp4

Re: FFmpeg 6.0

#45

Post by Aperocky »

komali2 wrote: post #40
shmerl wrote: post #8

Earlier quoted context omitted.

Google must be using it for Youtube. Wikimedia is using it as well.

They do, they say so here: https://support.google.com/youtube/answer/1722171#zippy=%2Cc... > YouTube does not recommend the RGB color matrix on uploads. In this case, YouTube initially sets the color matrix to unspecified before the standardization. It will then infer the color matrix using the color primaries during standardization. Note that sRGB TRC will convert to BT.709 TRC. YouTube re-tags the color primaries/m…

> Since FFmpeg is gpl2.1 I thought they had to make it easier to know they're using this

Precisely, I doubt youtube just brazenly ignored this, but their legal might have buried it under some obscure link. I wonder if there's a license that require it to be "highly visible" in some sort of way.

Re: FFmpeg 6.0

#46

Post by nicky0 »

gamegoblin wrote: post #43
nicky0 wrote: post #41

Earlier quoted context omitted.

Yes, chat GPT excels at comprehending and explaining things that have a consistent structure, restructuring, and and synthesising variations. If you keep it in its lane, it’s an excellent tool. It’s really really bad at counting though. For example, try asking it to produce a line of 40 asterisks.

It’s bad at counting because counting relies on a stateful O(N) algorithm you run in your brain. GPT is trained to reproduce human text, which tends to simply have the output of this O(N) counting process, but not the process itself. So GPT “thinks” it should be able to just spit out the number just like human text implies we do. It doesn’t know we are relying on an offline O(N) algorithm. If you have it emit a numbe…

That’s very interesting. I assumed it was something about the fact that it is a language model rather than a calculating machine. So printing 44 asterisks instead of 40 is kind of close.

I wonder if would it be possible to teach the machine to recognise situations it’s better at and be less confident other answers? Or does it need to be confident about everything in order to produce good answers where it does.

It’s kind of funny how confident chatgpt is about giving out bullshit, and then even when you correct it, it says oh I’m terribly sorry, here is definitely the correct answer this time and then it gives you another wrong answer. Just an observation, I realise it is just a tool that you have to understand the limitations of.

Re: FFmpeg 6.0

#47

Post by pmontra »

reidjs wrote: post #27
arjvik wrote: post #16

I absolutely love ffmpeg, but for the life of me I cannot understand how its pipeline system works. Each time I need to use it, I attempt to construct the command myself, but end up giving up and consulting StackOverflow. Amazingly, someone has usually done the exact thing I need to do and posted their command line to StackOverflow, so I'm never out of luck! How do I actually start understanding how ffmpeg works? I w…

I’ve never had to directly use ffmpeg. What do you do that makes it so useful to you? Something in video production?

Not parent but in my case yes, video production: ffmpeg to extract audio from captured video, process audio with Audacity, ffmpeg to cut video and merge it with the audio from Audacity.

Re: FFmpeg 6.0

#48

Post by jraph »

lxe wrote: post #6

Fun fact of the day: ffmpeg is written by Fabrice Bellard, who among other impressive things, wrote the JS PC emulator capable of running windows 2000 in a browser over 10 years ago that got me fascinated with emulators in general. https://bellard.org/jslinux/tech.html

We probably should have a Fabrice Bellard accomplishments auto-comment on HN that starts by "Did you know…?" on those submissions.

Re: FFmpeg 6.0

#49

Post by Sunspark »

nicky0 wrote: post #41
xbmcuser wrote: post #23

Earlier quoted context omitted.

I know a lot of people look down on ChatGpt. But I have been using it for creating scripts to use with ffmpeg and I was able to get most of the things that I needed with very little massaging required. You can then ask ChatGpt about what it did and why so it will explain it as well so you can get some basic understanding on how things work. People don't realise what kind of tool Chat Gpt is and how to properly utilis…

Yes, chat GPT excels at comprehending and explaining things that have a consistent structure, restructuring, and and synthesising variations. If you keep it in its lane, it’s an excellent tool. It’s really really bad at counting though. For example, try asking it to produce a line of 40 asterisks.

It gave me 40 short Gaulish warriors..

Re: FFmpeg 6.0

#50

Post by hnlmorg »

Aperocky wrote: post #7
QuarterRoy wrote: post #3

I love software that just does what it’s supposed to do and is so good at it that it’s an underpinning for other projects. FFmpeg, curl, nmap, et., al.

It is such a swiss knife kind of tool, there's just almost nothing it can't do when it comes to video, audio and image modifications. I wonder how many big companies uses it "in secret" that we don't know off, or distributes it with mentions buried deep underneath usage agreement.

It’s used heavily by professional broadcasters and TV/movie studios. AWS run it, satellite TV services use it, some VFX studios use it, etc. it’s become pretty foundational industry tech.
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