| ffmpeg -i input.mp4 -ss "00:00:00" -to "00:00:05" -filter:v "scale=iw*min(405/iw\,720/ih):ih*min(405/iw\,720/ih),crop=405:720" -c:v libx264 -crf 18 -an output_file.mp4 | |
| ffmpeg -i input.mp4 -ss "00:00:00" -to "00:00:05" -filter:v "scale=iw*min(405/iw,720/ih):ih*min(405/iw,720/ih),crop=405:720" -c:v libx264 -crf 18 -an output_file.mp4 |
| [Steps to create magic-dependencies-layer] | |
| 1. Launch an EC2 with Amazon Linux 2 OS. | |
| 2. SSH into EC2 instance. | |
| Let me share the commands I’ve used to create layer in this EC2 instance. | |
| > cd ~ | |
| > mkdir magic | |
| > cd magic | |
| > mkdir lib # this directory must be called 'lib' |
| [{"name":"John", "age":30, "car":null},{"name":"Simon", "age":38, "car":null}] |
Minimal example: transcode from MP3 to WMA:
ffmpeg -i input.mp3 output.wma
You can get the list of supported formats with:
ffmpeg -formats
Convert WAV to MP3, mix down to mono (use 1 audio channel), set bit rate to 64 kbps and sample rate to 22050 Hz:
| 0x123B92c756746dA9c264b6E87e7F388c404Ea8B8 |
| 0x10cef043efea423486f8a58584ce1c6e656b9d52 |
| /** | |
| * Current exchange - 1 ETH = 285.57 USD - 9/20/17 10:00 GMT | |
| */ | |
| /** | |
| * Math operations with safety checks | |
| */ | |
| contract SafeMath { | |
| function safeMul(uint a, uint b) internal returns (uint) { | |
| uint c = a * b; |
| 0x3CAd8863e53e90E76dC3f2A9B22052849CF7BCBf |
| 0xf1f1Dc5529D1804Fdccc90c002DE0EDA3978C861 |
| 0x123B92c756746dA9c264b6E87e7F388c404Ea8B8 |