twirp

'alo!
So I have a few questions before I kill something.
If I have PHP convert a video, does it keep the script active while it's converting, or does the converting go into a background process?
If it does go into a background process, is there a way to make it e-mail me when it's done?
I was also wondering if someone could give me a quick and dirty rundown of ffmpeg and using it to convert videos...
I noticed that a lot of the tutorials I've seen don't specify the -f, is it optional or something?

Thanks for any help or advice.

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sascoms

Hi,
I am not sure about your first question but for your next questions:
-if you are doing the conversion with a command like exec calling the ffmpeg utility on the server, you can just add an email function after the exec line.
-if you are doing the conversion by calling a server-side script such as python, you can add an email function on to that script. I saw python scripts written for video conversion.
-you can use ffmpeg.so as an php extension and then use ffmpeg-php library to utilize this extension.
from my bookmarks:
Upload and convert video server side
Yet Another Blog from Luar One-stop Installation Guide for Create a Linux Server-side FLV conversion environment
ffmpeg-php API documentation
[DB75]: FLV Encoding with FFmpeg
video converter - ffmpeg Linux by Examples

hope it helps..

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server: pass40

twirp

Does anyone have suggestions for reasonable frame rates and audio rates. I don't want to have the person waiting forever for the video to load, but I don't want it to sound or look crappy.

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H

What resolution will the videos be at... and what will your keyframe setting be? If you're transcoding to FLV, keyframes are insanely important as they have to be balanced between panning the video and file size.

MarkRH

If you go look here: DVD - 300 | Mark R Headrick's Website

You'll see Trailer 1 done in several versions. The audio in all of them is 128bit, 44.1Khz, Stereo. The bps setting in the filename is the Video bitrate. With the hires versions, some of the lower-speed broadband connections will start buffering, such as AT&T's lowest speed DSL offering, which my parents have.

I do all my conversions on the PC. Video conversion takes up too much CPU resources for a shared environment.. unless you can force it to run in some low priority mode so as to not impact others.

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Bigjohn

most pc's can do a good job with flash at 15fps, 32k audio (22k sample) and 96k video frame rate for a 320x240 video.

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twirp

It's not on a shared server, so there's no need to worry. I was converting some videos earlier and didn't notice too much of an impact (it's adds the video to a queue and does one video from the queue every 30 minutes or so and the videos are under 10 minutes). The first few times I was testing it, the image quality was low, but that was because of a low bitrate (I think). I'm still trying different settings. I almost have the quality and file size I want. One problem I'm running into though is that the the duration and other metadata (I guess?) isn't being written, so now I'm looking up info on the flvtool2...

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