From: Budge Sent: Thursday, January 12, 2017 18:26
Many thanks. Yes I agree ffmpeg was my first thought but I am spoiled for
choice of command options. ffprobe output didn't tell me what I was
looking for although that may be due to me not understanding what I was
looking at. However I have no doubt ffmpeg will clean things up. I shall
try a few options and see what happens.
Thanks for drawing attention to this. I did hope something similar might
lead to a solution of the problem I have playing DASH/M4A/AAC files on my
AGPtEK A02. I found about a year ago that ffmpeg created files with Major
Brand M4A and Minor Version 512, which the AGPtEK player did not seem to
like. I used
mp4box <file>.m4a -brand M4A:0 -out <file1>.m4a
from https://gpac.wp.mines-telecom.fr/mp4box/mp4box-documentation/
to change the Minor Version to 0. I then found I could play the files, but
only if they were shorter than 14min at 128kbit/s.
Following your post I have looked at it again. I see that by default
mp4box -brand M4A introduces interleaving of 500ms. I tried
mp4box <file>.m4a -brand M4A:0 -inter 1000 -out <file1>.m4a
to give 1s interleaving and that allowed a 24min file to be played, but the
display showed Format error after 15min. I also tried -inter 2000 for 2s
interleaving. That again allowed a 24min file to be played but with a
Format error after 5min.
mp4box <file> -info
gives a bit more information than ffprobe and ffmpeg. GPAC refers to
segments, fragments and interleaving. I am not sure how these relate to
what Linn calls chunks.
I have tried running ffmpeg with -acodec copy and with -acodec aac, but that
does not seem to help.
artisticforge said Handbrake fixed his files. Handbrake will not convert
audio only files. I have seen a workaraound to add dummy video, but that
seemed a bit cumbersome. I'll have to give it a try.
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