I did this:
ffmpeg -i input.mkv -map 0:1 -c copy -f rawvideo out1.dts
clean log
mkvextract tracks input.mkv 1:out2.dts
also no errors or warnings
out1.dts and out2.dts are bit-identical.
Then I tried to convert the raw dts-stream:
ffmpeg -i out1.dts -c:a alac alac.m4a
ffmpeg version N-93069-g6dc06e979c Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 8.2.1 (GCC) 20181201
configuration: --enable-gpl --enable-version3 --enable-sdl2
--enable-fontconfig --enable-gnutls --enable-iconv --enable-libass
--enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
--enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr
--enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack
--enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2
--enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab
--enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex
--enable-libxvid --enable-libaom --enable-libmfx --enable-amf
--enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc
--enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
libavutil 56. 26.100 / 56. 26.100
libavcodec 58. 46.100 / 58. 46.100
libavformat 58. 26.100 / 58. 26.100
libavdevice 58. 6.101 / 58. 6.101
libavfilter 7. 48.100 / 7. 48.100
libswscale 5. 4.100 / 5. 4.100
libswresample 3. 4.100 / 3. 4.100
libpostproc 55. 4.100 / 55. 4.100
Input #0, dts, from 'out1.dts':
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0:0: Audio: dts (DTS-HD MA), 48000 Hz, 5.1(side), s16p
Stream mapping:
Stream #0:0 -> #0:0 (dts (dca) -> alac (native))
Press [q] to stop, [?] for help
Output #0, ipod, to 'alac.m4a':
Metadata:
encoder : Lavf58.26.100
Stream #0:0: Audio: alac (alac / 0x63616C61), 48000 Hz, 5.1, s16p, 128 kb/s
Metadata:
encoder : Lavc58.46.100 alac
size= 1792kB time=00:00:22.44 bitrate= 654.1kbits/s speed=43.6x
[...]
size= 791296kB time=01:27:05.89 bitrate=1240.4kbits/s speed=37.8x
[dca @ 00000000003b96c0] Failed to decode block code(s)
Error while decoding stream #0:0: Invalid data found when processing input
size= 793600kB time=01:27:29.03 bitrate=1238.5kbits/s speed=37.8x
[...]
size= 1592971kB time=02:54:56.43 bitrate=1243.2kbits/s speed=37.5x
video:0kB audio:1592466kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.031661%
Same error at same timestamp.
Second error message "Residual encoded channels are present without core" is
gone but the other error message persists.
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