Re: [FFmpeg-user] Crop 4K Video into Four 1080p Videos?

2017-06-26 Thread Clay D. Montgomery 

Thank You Gyan!


On 6/26/2017 2:02 PM, Gyan wrote:

On Mon, Jun 26, 2017 at 11:58 PM, Clay D. Montgomery 
wrote:


Hello,

 I'm wondering if it is possible to use ffmpeg to slice 4K video into a
set of four 1080p videos and do it without scaling.


You need to use the crop filter. For four distinct outputs,

 ffmpeg -i input -vf crop=1920:1080:0:0 output1 -vf
crop=1920:1080:1920:0 output2 -vf crop=1920:1080:0:1080 output3 -vf
crop=1920:1080:1920:1080 output4

(I've ignored audio. The above command will transcode it. Add -c:a copy
before each output to avoid that)
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Re: [FFmpeg-user] Crop 4K Video into Four 1080p Videos?

2017-06-26 Thread Gyan 
On Mon, Jun 26, 2017 at 11:58 PM, Clay D. Montgomery 
wrote:

> Hello,
>
> I'm wondering if it is possible to use ffmpeg to slice 4K video into a
> set of four 1080p videos and do it without scaling.
>

You need to use the crop filter. For four distinct outputs,

ffmpeg -i input -vf crop=1920:1080:0:0 output1 -vf
crop=1920:1080:1920:0 output2 -vf crop=1920:1080:0:1080 output3 -vf
crop=1920:1080:1920:1080 output4

(I've ignored audio. The above command will transcode it. Add -c:a copy
before each output to avoid that)
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[FFmpeg-user] How can i build ffmpeg in LSB fromat

2017-06-26 Thread 黃祥智 
Dear Sir,
As title, I add –EL to --extra-cflags, but it fail on C compiler test. 
Can you guys tell me what should I do to build ffmpeg in LSB format
[cid:image001.png@01D2EEA0.313942E0]

Best regards,
Johnny Huang


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[FFmpeg-user] Crop 4K Video into Four 1080p Videos?

2017-06-26 Thread Clay D. Montgomery 

Hello,

I'm wondering if it is possible to use ffmpeg to slice 4K video 
into a set of four 1080p videos and do it without scaling.


I have experimented with using the -s size option before the input, but 
I have not found a way to offset the position for cropping the video.


This also might require rotating the output videos by 90 degrees.

I would appreciate any advise on this.


Thanks, Clay


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[FFmpeg-user] A Python AWS Lambda zip with OpenCV + FFmpeg?

2017-06-26 Thread Daniel Lopes 
Hi Guys,

I have this question on Stack overflow, someone here knows if with *AWS
Lambda *I can use *FFmpeg* + *OpenCV*, I talked with a guy from Amazon, he
said that I have to compile all environment in a Amazon Linux, I compile
the entire *Python 3.6*, FFmpeg and OpenCV.

I thinks my package that is not well. *Which files from FFMpeg I have to
embed in the python package?*

My Stack overflow question url: https://stackoverflow.
com/questions/44318020/how-to-create-a-python-aws-lambda-
zip-with-opencv-ffmpeg

Thanks for your help!

Best,

-- 
Eng. Daniel Lopes
Data Scientist
CREA/SP 5069410560

 | RNP 2613651334

www.daniellopes.com.br

 | dan...@daniellopes.com.br | +55 (18) 99764-2733 
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Re: [FFmpeg-user] Mp3 segmentation fault, why? FIXED

2017-06-26 Thread Bouke / VideoToolShed 

> On 24 Jun 2017, at 17:27, Bouke / VideoToolShed  
> wrote:
> 
>> A segmentation fault should usually not be your fault. It could be
>> ffmpeg, it could be libmp3lame, or it could be some unfortunate
>> exchange of libraries.
>> 
>> Did you build this ffmpeg yourself? Do you have access to the version

I was feeding 48K to the Mp3 echidna, and ‘sometimes’ it seems to choke on that.
-r 32000 made the problem go away….

Bouke

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