UBUNTU BATCH SCRIPT EXAMPLE HOW TO
UBUNTU BATCH SCRIPT EXAMPLE FULL
UBUNTU BATCH SCRIPT EXAMPLE MAC

So, if you want the output to be a full set of packaged HLS or DASH files for uploading to a server it’s easy enough to do.

UBUNTU BATCH SCRIPT EXAMPLE HOW TO

Note that you can run any command line accessible program from this script, including a packager like Bento4, which I show how to use here, or to run a quality metric computation as I did in my script for this project. I never include spaces in file names so I didn’t use the quotes that Thomas recommended. Lines 5 and 7 use the wildcard to run first and second pass encodes in FFmpeg. Line 3 creates uses the wildcard to create a folder for the output files for all video files. Once it’s up and working, run a search and replace to swap $1 for the test file name. I suggest you create this batch using a real file name, since you may have to debug different switches along the way and FFmpeg won’t know what to do with $1.mp4 from the command line. Here’s the first few lines of the batch file that I created. Step 1 is creating the batch file with the wildcard character. Thanks, Thomas, for this great explanation, let’s put it to use. Thomas Kramer, VP of Product Management at MainConcept, sent back the following Mother Lode of information. I researched for a bit and found nothing on point, so I reached out to a few colleagues who are familiar with bash scripting on Ubuntu. To begin scripting we must be aware of the commands of the batch interface. bat file in any text editor and start scripting. Now rename this file with extension as ‘.

UBUNTU BATCH SCRIPT EXAMPLE MAC

I was performing this project on an AWS Instance running Ubuntu, however, so I needed to learn how to use wildcards on Ubuntu, and if I got that working, to test the Mac as well. Steps to create a Batch file are pretty simple:. In terms of operation, I know how to use wildcard characters in Windows as I explain in this article. If the VMAF score was much higher, I would consider using a more aggressive ladder. So, if the average data rate of output_crf23.mp4 was 3 mbps, and the VMAF was 94, I would assign it to the template that peaked at 3 mbps. I planned to allocate files to a ladder by encoding at -crf 23 like so and measuring the average data rate and VMAF score.įfmpeg -i input.mp4 -crf 23 output_crf23.mp4 Producing custom ladders for each file is time consuming, of course, and error-prone, so for a recent project that involved 25 test files, I decided to create 8 encoding ladders in templates with the top rungs ranging from 1 – 8 Mbps. Whenever I test codecs or encoders, I customize the encoding ladder for each test video so that most output files are in the 85-95 VMAF range, which is typically the quality level for the top quality file in an OTT encoding ladder. You mention 'DOS batch' but, based on several points, I think the former choice is a safe bet (1). The overall schema discussed can create a simple and inexpensive per-title encoding facility. Note that this answer is tailored toward cmd batch language, the one found in Windows. This article teaches you how to create and run bash scripts that use wildcards on Ubuntu and the Mac. Wildcards let you to encode and package multiple files using a single script.

Ubuntu batch script example