I managed to make video with amr_nb codec in openCamera (android 11)
====
mediainfo /dev/shm/VID_20240215_064913.mp4
General
Complete name : /dev/shm/VID_20240215_064913.mp4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42 (isom/mp42)
File size : 21.1 MiB
Duration : 5 min 2 s
Overall bit rate mode : Variable
Overall bit rate : 586 kb/s
Frame rate : 19.929 FPS
Encoded date : 2024-02-15 03:54:16 UTC
Tagged date : 2024-02-15 03:54:16 UTC
com.android.version : 11
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Constrained Baseline@L2
Format settings : 1 Ref Frames
Format settings, CABAC : No
Format settings, Reference frames : 1 frame
Format settings, GOP : M=1, N=30
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 5 min 2 s
Source duration : 5 min 1 s
Bit rate : 562 kb/s
Width : 640 pixels
Height : 480 pixels
Display aspect ratio : 4:3
Frame rate mode : Variable
Frame rate : 19.929 FPS
Minimum frame rate : 9.998 FPS
Maximum frame rate : 30.010 FPS
Standard : Component
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.092
Stream size : 20.2 MiB (96%)
Source stream size : 20.2 MiB (96%)
Title : VideoHandle
Language : English
Encoded date : 2024-02-15 03:54:16 UTC
Tagged date : 2024-02-15 03:54:16 UTC
Color range : Limited
Color primaries : BT.601 NTSC
Transfer characteristics : BT.709
Matrix coefficients : BT.601
mdhd_Duration : 302037
Codec configuration box : avcC
Audio
ID : 2
Format : AMR
Format/Info : Adaptive Multi-Rate
Format profile : Narrow band
Codec ID : samr
Duration : 5 min 2 s
Bit rate mode : Variable
Bit rate : 12.8 kb/s
Channel(s) : 1 channel
Sampling rate : 8 000 Hz
Bit depth : 13 bits
Stream size : 472 KiB (2%)
Title : SoundHandle
Writing library :
Language : English
Encoded date : 2024-02-15 03:54:16 UTC
Tagged date : 2024-02-15 03:54:16 UTC
====
ffmpeg (both 4.4.4 on Slackware 15.0 i586 and 6.1.1 on aarch64 Termux)
refuse to copy audio stream:
ffmpeg -i /dev/shm/VID_20240215_064913.mp4 -c:a copy -c:v copy /dev/shm/ccc.mp4
ffmpeg version 4.4.4 Copyright (c) 2000-2023 the FFmpeg developers
built with gcc 11.2.0 (GCC)
configuration: --prefix=/usr --libdir=/usr/lib --shlibdir=/usr/lib
--docdir=/usr/doc/ffmpeg-4.4.4/html --mandir=/usr/man --disable-debug
--enable-shared --disable-static --enable-gpl --enable-version3
--enable-avresample --arch=i586 --enable-libfontconfig
--enable-libfreetype --enable-libfribidi --enable-gnutls
--enable-libass --enable-libbluray --enable-libcdio --enable-frei0r
--enable-libgsm --enable-openal --enable-libopus --enable-librtmp
--enable-libsnappy --enable-libspeex --enable-libssh
--enable-libtheora --enable-libtwolame --enable-libv4l2
--enable-libvidstab --enable-libvorbis --enable-libvpx
--enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid
--enable-libmp3lame --enable-opencl --enable-opengl
--enable-libopenjpeg --disable-libpulse --enable-libsmbclient
--enable-libsvtav1 --enable-libxml2 --enable-librsvg --enable-libdrm
--enable-libaom --enable-libdav1d --enable-libsoxr --enable-libzimg
--enable-vapoursynth
libavutil 56. 70.100 / 56. 70.100
libavcodec 58.134.100 / 58.134.100
libavformat 58. 76.100 / 58. 76.100
libavdevice 58. 13.100 / 58. 13.100
libavfilter 7.110.100 / 7.110.100
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 9.100 / 5. 9.100
libswresample 3. 9.100 / 3. 9.100
libpostproc 55. 9.100 / 55. 9.100
[amrnb @ 0x87d54c0] Multiple frames in a packet.
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/dev/shm/VID_20240215_064913.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
creation_time : 2024-02-15T03:54:16.000000Z
com.android.version: 11
Duration: 00:05:02.04, start: 0.000000, bitrate: 585 kb/s
Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 /
0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709), 640x480, 562
kb/s, SAR 1:1 DAR 4:3, 19.93 fps, 60 tbr, 90k tbn, 180k tbc (default)
Metadata:
creation_time : 2024-02-15T03:54:16.000000Z
handler_name : VideoHandle
vendor_id : [0][0][0][0]
Stream #0:1(eng): Audio: amr_nb (samr / 0x726D6173), 8000 Hz, mono,
flt, 12 kb/s (default)
Metadata:
creation_time : 2024-02-15T03:54:16.000000Z
handler_name : SoundHandle
vendor_id : [0][0][0][0]
[mp4 @ 0x87d9840] Could not find tag for codec amr_nb in stream #1,
codec not currently supported in container
Could not write header for output file #0 (incorrect codec parameters
?): Invalid argument
Error initializing output stream 0:1 --
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Last message repeated 1 times
====
well, I guess if Android somehow managed to put this into mp4 ffmpeg
should be able to do the same trick, no?
The AMR audio format is not specified as a valid audio format for the
mp4 container (see *ISO
<https://en.wikipedia.org/wiki/International_Organization_for_Standardization>/IEC
<https://en.wikipedia.org/wiki/International_Electrotechnical_Commission>
14496-14:2003)*. So managing to get it in does not mean it can be played
or transcoded by other software that conforms to the mp4 specifications.
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