Hi there --- I guess this is a somewhat academic question, but...
Can anyone tell me if and how transcode (perhaps via ffmpeg, avimerge
etc.) can *encode* AVI files as mjpeg video with ima_adpcm audio? Why do
I want to do this? Well, I'm curious to see whether I can create files
in the same format as those produced by a Casio Exilim digital camera
such that they can be copied to the SD card and the camera will play them.
So far I can create files whose video content does play on the camera...
transcode -i somexvidfile.avi -o camfile.avi -Z 320x240 -y ffmpeg -F mjpeg
but whose audio is still the mp3 encoded 2 channel 44100Hz of the
original. The target audio is (I think) 1 channel 22050Hz encoded as
ima-adpcm. I've not been able to figure out how I can get ffmpeg to
create such audio, or how I can get transcode to use ffmpeg to do it
even if it could. However, the audio can be extracted like this...
trasncode -i somexvidfile.avi -o camfile_pcm.wav -E 22050,0,1 -x
null,raw -y wav
and sox used to convert from pcm to ima_adpcm...
sox camfile_pcm.wav -i camfile_imaadpcm.wav
and an avi with video but no sound is easy enough to create.
But... that's as far as I've got --- can transcode create an AVI that
combines my camfile.avi and camfile_imaadpcm.wav?
cheers
guy
