MobileRead Forums - View Single Post - Audio (video) - Kindle. Getting it up and running, Code level.

geekmaster · 07-11-2012, 01:15 PM

I found a script on my k5 that decodes simultaneous audio and video:

Code:

#!/bin/sh ./ffmpeg -d -i $1 -an -pix_fmt gray -sws_flags neighbor -f rawvideo -s 800x600 -|./raw2gmv|./gmplay & ./ffmpeg -d -i $1 -vn -f s16le -acodec pcm_s16le -ar 44100 -|aplay -f cd

I do not think the K3 is powerful enough to do this realtime, with all that CPU time burned in the eink update syscalls.

Notice the "&" after the first ffmpeg call. They run as parallel processes.

BTW, there are lots of examples on the net using this "two instance" method for ffmpeg to play simultaneous audio and video streams. Luckily, interleaved input will already be cached for the other instance.

Also, notice that to make realtime playing possible, I cheated a little (nearest-neighbor pixel downsampling of HD rotated to 600x800).

07-11-2012, 01:15 PM	#101
geekmaster Carpe diem, c'est la vie. Posts: 6,433 Karma: 10773670 Join Date: Nov 2011 Location: Multiverse 6627A Device: K1 to PW3	I found a script on my k5 that decodes simultaneous audio and video: Code: #!/bin/sh ./ffmpeg -d -i $1 -an -pix_fmt gray -sws_flags neighbor -f rawvideo -s 800x600 -\|./raw2gmv\|./gmplay & ./ffmpeg -d -i $1 -vn -f s16le -acodec pcm_s16le -ar 44100 -\|aplay -f cd I do not think the K3 is powerful enough to do this realtime, with all that CPU time burned in the eink update syscalls. Notice the "&" after the first ffmpeg call. They run as parallel processes. BTW, there are lots of examples on the net using this "two instance" method for ffmpeg to play simultaneous audio and video streams. Luckily, interleaved input will already be cached for the other instance. Also, notice that to make realtime playing possible, I cheated a little (nearest-neighbor pixel downsampling of HD rotated to 600x800). Last edited by geekmaster; 07-11-2012 at 01:18 PM.