Hi,
I have a Matroska video with libx264 video and libvorbis audio. when I
copy it to MP4 container, the resulting video does not play audio on
Android 8 phone -> "Audio-Codec not supported"
Matroska: http://jugkoeln.de/Projects/ffmpeg/K%C3%B6nig_de_3.mkv
MP4: http://jugkoeln.de/Projects/ffmpeg/K%C3%B6nig_de_3.mp4
But the Matroska video with the same audio stream plays flawlessly.
So I guess, there must be something wrong in with the meta data in the
MP4 container. The ffprobe output shows a kind of weird or incomplete
(see below).
Can one help me, to check this out?
Additionally:
From ffmpeg output, the audio stream is 1991 kiB, so with 3 min.
duration it has 90.6 kb/s.
According to mediainfo for Matroska file:
audio codec: Vorbis / A_VORBIS <- correct
audio stream size: 2.40 MiB <- wrong
Bit rate mode: Variable <- correct
audio bit rate: 112 kb/s <- wrong
According to mediainfo for MP4 file:
audio codec: Ogg / mp4a-DD <- wrong
audio stream size: 1.94 MiB <- correct
Bit rate mode: Constant <- wrong
audio bit rate: 90.6 kb/s <- correct
So in both files some metadata seems wrong.
Vorbis audio is officially not supported by the mp4 container
specifications.
Matroska does not have this problem as it supports almost all known codecs.
These are the audio codecs that are in the mp4 specifications: AAC, ALS,
SLS, MP3, MP2, MP1, CELP, HVXC, TTSI, SAOL, Apple Lossless, FLAC, Opus
Others can be muxed in, but most players will not support playing those.
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