ffmpeg h264 guide related

[Anonymous543]

ffmpeg guide link
h264 - https://trac.ffmpeg.org/wiki/Encode/H.264

I visited h264 guide link ,in that under overwriting default preset settings section it says we can overwrite default presets with -x264-params option
Question 1. Will it overwrite settings for a single encode or save those new settings forever and use that new settings for every next encode?

Currently I don't have pc that's why I can't experiment..

[poisondeathray]

All commands only affect the current instance

[jagabo]

This question was already answered for you in other threads.

[Anonymous543]

@jagabo you answered that question in other thread but you also said me to test my self ,so I thought you are also not sure about it and for testing I don't have pc ,currently it's gone for repair

That's why....



And @poisondeathray or any experts check
ffmpeg h265 encoding guide here - https://trac.ffmpeg.org/wiki/Encode/H.265

It uses that -x265-params option for 2 pass encoding so if I specify something with -x265-params like -x265-param -g 1
So this will only affect to my current instance? or it will affect on my future instances also?


Am getting confusion because in h264 guide it written as OVERWRITE default presets
but not mentioned that it will overwrite for current instance or overwrite forever ,untill delete ffmpeg.exe and download new one.

[jagabo]

It uses that -x265-params option for 2 pass encoding so if I specify something with -x265-params like -x265-param -g 1
So this will only affect to my current instance? or it will affect on my future instances also?

It's the same as libx264 (and every other encoder in ffmpeg, I believe) -- anything you specify on the command line only effects that particular encoding. Nothing is remembered.

Am getting confusion because in h264 guide it written as OVERWRITE default presets

It means only for that particular encoding. It is not remembered for future encodings. Every time you start x264 it starts with the same default settings.

[Anonymous543]

@jagabo you sure? because you said "I believe"

[jagabo]

I'm sure about x264 and x265 and several others I've used.. But there are dozens of encoders in ffmpeg and I haven't used them all. So I can't say with absolute certainty that none of them remembers some settings.

[Anonymous543]

@jagabo so in x264 and x265 it won't save settings for future instances?

[poisondeathray]

ffmpeg libx264 and libx265 are only affected by current session. Nothing is saved from previous sessions

While -preset chooses the best possible settings for you, you can overwrite these with the x264-params option,

a better chose of words would be "override"

any options you specify will change the current settings to those you specify. If you specify no options in the current or any session, then the default settings used

sometimes one setting will change other settings; for example for ffmpeg libx264, the default setting for pass 1 is a "fast" first pass. Multiple settings are changed that increase speed for the 1st pass.

[jagabo]

Again, instead of asking over and over again, just test for yourself and see. It will only take you a few minutes.

1) Encode a short video at default settings.
2) Encode the same short video with several overrides.
3) Encode the same video at the default settings again.

Compare MediaInfo reports of all three. Which two match?

[Anonymous543]

Thanks for info