On 06/02/2012 12:34, Kapitano wrote:
Thank you, for all the answers. My workaround is to download using the
--raw switch, which gives .flv files, from which I extract the .aac
using FLV Extract (downloadable here: http://moitah.net/).
For some strange reason I've been unable to find a program which
*quickly* extracts the sound from a mp4/m4a container.
ffmpeg should be snappy enough. An unscientific example from my machine
with a 2-hour 128k audio file: ffmpeg takes 3-4 seconds to extract the
AAC audio stream from either FLV or MP4 container, whereas flvextract
take 1-2 seconds to extract audio from FLV. Not much of a difference.
Then again, there's no need to create the M4A file if you don't need it.
One esoteric thing to note. The AAC streams in the M4A files from
get_iplayer (but not the stream in FLV files from --raw) have been
passed through ffmpeg's aac_adtstoasc filter to remove ADTS headers.
This would seem to have no bearing on your setup, but I think some
players had trouble unless the headers were filtered.
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