TECHBYTES, our audiocast as we call it, currently comes in two methods of delivery. One is purely audio and another is video plus audio. But YouTube is a large platform and many shows put their material in there. Turning 50 shows into video can be a tedious task with a graphical user interface, whereas with command line tools this process can be automated. After some exploration we found a way to turn audio into a slideshow and then split the files for uploading the resultant Ogg files (given the known upload limits). To encode using a command line utility or set thereof, the following chain of commands gets issued:
mencoder -ss 00:00:00 -endpos 00:10:10 mf://*.jpg -audiofile ~/TechBytes/48/techbytes0048.ogg -ovc lavc -oac mp3lame -fps 0.1 -o 48p1.ogg
mencoder -ss 00:10:00 -endpos 00:20:10 mf://*.jpg -audiofile ~/TechBytes/48/techbytes0048.ogg -ovc lavc -oac mp3lame -fps 0.1 -o 48p2.ogg
-ss 00:00:00 means it starts at 0 seconds, -endpos 00:10:10 defines an endpoint using the same type of time format, mf://*.jpg takes all the images in the current directory -- images that are generated by duplication except for the first one. Files can be easily replicated (e.g. to serve as dummy sequence) with:
for file in *.jpg
do
`nice cp ${file} ${file}-dupe.jpg`
done
-audiofile, encoders, frames per seconds (fps), and an output file at the very end. To split videos into smaller chunks, we have tried many different tools but eventually used mencoder to simplify the pipeline (thanks to all those who helped in IRC). This whole command basically turns a simple sound file into smaller ogg files that also contain images with transitions between them. Since it is scriptable, we can now apply this to all past episodes. YouTube is moving to WebM quite soon and in any case, making it a mere option using Ogg format and free software utilities simply broadens our reach. ⬆
Comments
saulgoode
2011-05-28 06:38:25
I have to travel out of state for a niece's wedding and won't be back till later next week. I will see what I can do then.
Here is a tutorial on creating a Vorbis+Theora slideshow (the LiVES video editor might also work, though I haven't done slideshows with it yet and Theora support is a relatively recent addition).
Theora slideshow creation
saulgoode
2011-05-28 05:12:53
What purpose is served by placing MP3 audio in an OGG container?
Dr. Roy Schestowitz
2011-05-28 05:28:07
By the way, I used your tips today, but oggSplit did not perform the functions I was after in this case. I tried about 4 command-line tools.