CBR x3 Test video

[kunle]

While on holiday decided to test the cbr x 3 feature in magic lantern. To get it to work I had to disable audio. Captured audio using Zoom H1.
Camera used was a 600d using samyang 35mm f/1.4 wide open. Magic Bullet looks was used for Colour correction. All comments welcome.

[AriLG]

How did you sync the muted video file and the H1 based one ?

[kunle]

How did you sync the muted video file and the H1 based one ?

syncing was a bit difficult but I didn't spend much time planning and editing audio. I just captured the welding and banging noises in fcp and put it against the video timeline. and then I captured a sample of the background noises and dropped in the timeline. If there was dialogue it would have been very difficult. Does anybody have any ideas to get around this? I would normally use the audio captured in the camera as a reference point during sync.

[ilguercio]

I use my 50D and i am trying as well to find a way to solve this problem since there's no audio onboard.
The most i can do now is press both record buttons at the same time and then fine adjust the overlapping of the tracks in post.
Sadly the Zoom H1 can't be started remotely, as far as i know.

[juantrueno]

Use a visual clap to sync on every shot. Then find clap sound and clap Video.

[ilguercio]

Well, you can do that if another person claps the board for you.
If it can't happen things get quite annoying.

[kunle]

Snapping your finger in front of the camera while recording video and audio, seems to be a good idea. I havent tried it yet.

[1%]

Audio with high BR now working on 600D and maybe for everyone with FPS override. I get higher BR than 3.0x but at that quality 1gb = 1 minute. I kept saying there was a difference, now you see.

[ilguercio]

What do you mean higher than 3.0x CBR?

[1%]

Quality above qscale -16, higher picqpc and ALL-I, basically very little compression.

[ilguercio]

Quality above qscale -16, higher picqpc and ALL-I, basically very little compression.

What kind of card?

[1%]

Patriot 64GB UHS.. card is usually 20MB/write. Complexity is more of a problem than card speed. Encoder can't keep up and slows down then you get buffer full even though frames were supposed to be written out immediately and at lower complexity they are.

Looks like this:

[kunle]

I use a SanDisk Extreme Pro 16GB SDHC card, with the latest ML firmware. If audio is enabled recording stops immediately it starts.Recording the same scene without audio works fine. Are there any additional settings that need to be enabled/disabled e.g global draw?

[1%]

Nope, just new dev features. Global draw really has no effect. Audio just won't write with the video stream, encoder can't keep up. It happily writes wavs at the same time though.

[kunle]

1% thanks for the info, I just tried recording with qscale -13 and seems to be stable with audio turned on. Is the video quality (less compression) better using VBR over CBR?

[1%]

CBR adjust qscale but tries to keep a constant bit rate. VBR/Qscale keeps quality at certain level but bitrate goes wherever.

So run and gun, CBR at like 2x. Controlled environments use qscale. Eventually you will figure out what works and what doesn't. I just patched out CBR/Qscale from adjusting quality and set it directly, combined with ALL-I this is probably close to the best h.264 can get in its current state.

Audio is kinda irrelevant as we have separate wav working pretty well. You can use it with FPS override on latest official commits and whenever on mine.

I've never been able to use the built in audio without it fscking things up. For 600D you can try what I made already, other cameras not so much... but I would like to see fixed quality at all-I from 5DMkII and a really fast CF card.

[ilguercio]

CBR adjust qscale but tries to keep a constant bit rate. VBR/Qscale keeps quality at certain level but bitrate goes wherever.

So run and gun, CBR at like 2x. Controlled environments use qscale. Eventually you will figure out what works and what doesn't. I just patched out CBR/Qscale from adjusting quality and set it directly, combined with ALL-I this is probably close to the best h.264 can get in its current state.

Audio is kinda irrelevant as we have separate wav working pretty well. You can use it with FPS override on latest official commits and whenever on mine.

I've never been able to use the built in audio without it fscking things up. For 600D you can try what I made already, other cameras not so much... but I would like to see fixed quality at all-I from 5DMkII and a really fast CF card.

Will this stuff be available for other cameras soon?

[1%]

I can do ALL-I for other cameras but I need to know from each cameras firmware where to jump the "invalid gop" assert.

PicQpc/Qp slice also has separate locations too.

Since I only have 600D firmware it makes it hard to port to others. Separate audio is already in for others if you build from source and use FPS override.

[ilguercio]

I can do ALL-I for other cameras but I need to know from each cameras firmware where to jump the "invalid gop" assert.

PicQpc/Qp slice also has separate locations too.

Since I only have 600D firmware it makes it hard to port to others. Separate audio is already in for others if you build from source and use FPS override.

If you need something from my 50D...

[1%]

Do you have a bin dump from it? But then I need to know where to jump the assert and nanomad has the calculator for the nop offset (its probably different).

I can make a bootleg bin with all asserts off and you can see if it works, some cameras just stopped writing at different gop according to a1ex.

[ilguercio]

Do you have a bin dump from it? But then I need to know where to jump the assert and nanomad has the calculator for the nop offset (its probably different).

I can make a bootleg bin with all asserts off and you can see if it works, some cameras just stopped writing at different gop according to a1ex.

Feel free to tell me what to do, but tell me HOW to do it.
I'm free tonight

[1%]

I'm not sure how to dump it, I just got the files. I was unable to dump from my camera for some reason but haven't tried recently.

https://bitbucket.org/OtherOnePercent/tragic-lantern/downloads/autoexec.bin.50D.Fat32.Assert%20Disabled

That is for 50d with asserts disabled but make sure to change gop size back before shutting down in case (if you load a regular bin and its still invalid). No exfat support right?

[kunle]

1% I have a canon 60D and 600D can I use these settings with the current ML firmware? If so I cant find the settings for wav files.

[1%]

It was put in the source like 2 days ago so you'd have to make a new 60D bin.

[ilguercio]

I'm not sure how to dump it, I just got the files. I was unable to dump from my camera for some reason but haven't tried recently.

https://bitbucket.org/OtherOnePercent/tragic-lantern/downloads/autoexec.bin.50D.Fat32.Assert%20Disabled

That is for 50d with asserts disabled but make sure to change gop size back before shutting down in case (if you load a regular bin and its still invalid). No exfat support right?

No exFAT.
Let me try it
How can i see if it went well?