Transcode

Introduction

• trancode project page
• v4l examples

The transcode program provides an integrated framework for encoding and transcoding, bringing together a large number of multimedia projects under one umbrella.

Recording from v4l

This example works on saa7134 cards, using the saa7134-alsa DMA module:

transcode -x v4l2,v4l2 -M 2 -i /dev/video$DEV -p /dev/dsp$DEV -y ffmpeg -F msmpeg4v2 \
-c $TIM -g 640x480 -f 29.970,4 -u 1024 -Q 5 -e 32000,16,2 --lame_preset medium \
-o $DIR/$FIL.avi

The trick here is to set the audio import to 32000,16,2 -- the parameters used by the DMA audio channel on the card, and thus by the 7134-alsa module.