On 11/18/2020 6:59:38 PM, "Tom Worster" <[email protected]> wrote:
How can I repair a file with an error like this?
[aac @ 0x5d738c0] channel element 1.0 is not allocated
Instead of what you see below, the file should have, i think
Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo,
fltp,
% ~/ffmpeg-git-20201020-amd64-static/ffprobe -i WOWD-20201116T210000Z.m4a
ffprobe version N-54690-g682990a849-static https://johnvansickle.com/ffmpeg/
Copyright (c) 2007-2020 the FFmpeg developers
built with gcc 8 (Debian 8.3.0-6)
configuration: --enable-gpl --enable-version3 --enable-static --disable-debug
--disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc
--enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp
--enable-libgme --enable-gray --enable-libaom --enable-libfribidi
--enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
--enable-librubberband --enable-libsoxr --enable-libspeex --enable-libsrt
--enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab
--enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264
--enable-libx265 --enable-libxml2 --enable-libdav1d --enable-libxvid
--enable-libzvbi --enable-libzimg
libavutil 56. 60.100 / 56. 60.100
libavcodec 58.111.101 / 58.111.101
libavformat 58. 62.100 / 58. 62.100
libavdevice 58. 11.102 / 58. 11.102
libavfilter 7. 88.100 / 7. 88.100
libswscale 5. 8.100 / 5. 8.100
libswresample 3. 8.100 / 3. 8.100
libpostproc 55. 8.100 / 55. 8.100
[aac @ 0x5d738c0] channel element 1.0 is not allocated
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'WOWD-20201116T210000Z.m4a':
Metadata:
major_brand : M4A
minor_version : 512
compatible_brands: M4A isomiso2
encoder : Lavf58.45.100
Duration: 00:04:59.45, start: 38994.477007, bitrate: 126 kb/s
Stream #0:0(und): Audio: aac (LTP) (mp4a / 0x6134706D), 7350 Hz, 5.0, fltp,
125 kb/s (default)
Metadata:
handler_name : SoundHandler
I've had no luck so far reproducing the error that created files like these. If
that's important, lemmy know I'll keep trying.
I may have found a fix.
ffmpeg -i broken.m4a -af "channelmap=0|1:stereo" better.m4a
The channelmap spec was a guess but the file plays and the ffprobe looks
reasonable so I guess that's enough.
Tom
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