[FFmpeg-trac] #9438(avformat:new): mp4: ffmpeg can't read track title metadata
FFmpeg
trac at avcodec.org
Fri Sep 24 06:58:01 EEST 2021
#9438: mp4: ffmpeg can't read track title metadata
-------------------------------------+-------------------------------------
Reporter: Dong Nguyen | Type: defect
Status: new | Priority: normal
Component: avformat | Version: git-
Keywords: mp4 | master
metadata | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
- Generate any test mp4 file with multiple audio streams
- Using ffmpeg to add "title" metadata to each audio stream
- Using ffprobe to check the file metadata, expect output has the title
metadata
- VLC can show audio track title in drop down menu
How to reproduce:
{{{
# generate test.mp4 with 3 audio streams or any similar test file can do
% gst-launch-1.0 -e videotestsrc pattern="ball" !
video/x-raw,width=1280,height=720 ! x264enc ! queue ! mp4mux name=mux !
filesink location="test.mp4" \
audiotestsrc wave="sine" volume=0.5 !
audio/x-raw,layout=interleaved,format=F32LE,rate=48000,channels=2 !
avenc_aac ! aacparse ! queue ! mux. \
audiotestsrc wave="pink-noise" !
audio/x-raw,layout=interleaved,format=F32LE,rate=48000,channels=2 !
avenc_aac ! aacparse ! queue ! mux. \
audiotestsrc freq=5 !
audio/x-raw,layout=interleaved,format=F32LE,rate=48000,channels=2 !
avenc_aac ! aacparse ! queue ! mux.
# add title
% ffmpeg -i test.mp4 -map 0 -c copy \
-metadata:s:a:0 title="My Title 1" \
-metadata:s:a:1 title="My Title 2" \
-metadata:s:a:2 title="My Title 3" \
test_labeled.mp4
...
Output #0, mp4, to 'test_labeled.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42mp41isomiso2
encoder : Lavf59.5.100
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv,
bt709), 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 79 kb/s, 30 fps, 30 tbr, 12k
tbn (default)
Metadata:
creation_time : 2021-09-24T03:43:33.000000Z
handler_name : VideoHandler
vendor_id : [0][0][0][0]
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo,
fltp, 128 kb/s (default)
Metadata:
creation_time : 2021-09-24T03:43:33.000000Z
handler_name : SoundHandler
vendor_id : [0][0][0][0]
title : My Title 1
Stream #0:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo,
fltp, 127 kb/s (default)
Metadata:
creation_time : 2021-09-24T03:43:33.000000Z
handler_name : SoundHandler
vendor_id : [0][0][0][0]
title : My Title 2
Stream #0:3(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo,
fltp, 127 kb/s (default)
Metadata:
creation_time : 2021-09-24T03:43:33.000000Z
handler_name : SoundHandler
vendor_id : [0][0][0][0]
title : My Title 3
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Stream #0:2 -> #0:2 (copy)
Stream #0:3 -> #0:3 (copy)
Press [q] to stop, [?] for help
frame= 257 fps=0.0 q=-1.0 Lsize= 453kB time=00:00:08.46 bitrate=
438.1kbits/s speed=1.67e+03x
video:83kB audio:356kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 3.177835%
# probe the output file
% ffprobe test_labeled.mp4
ffprobe version N-103790-g447cf53774 Copyright (c) 2007-2021 the FFmpeg
developers
built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
configuration: --prefix=/usr/local --disable-static --enable-shared
--enable-gpl --enable-openssl --enable-libaom --enable-libass --enable-
libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus
--enable-libzimg --enable-libvorbis --enable-libvpx --enable-libx264
--enable-libx265 --enable-libdav1d --enable-nonfree --enable-vulkan
--enable-cuda-nvcc --enable-cuvid --enable-nvenc --enable-libnpp --extra-
cflags='-I/usr/local/cuda/include -march=native -mtune=native' --extra-
ldflags=-L/usr/local/cuda/lib64 --nvccflags='-gencode
arch=compute_52,code=sm_52 -O2'
libavutil 57. 6.100 / 57. 6.100
libavcodec 59. 9.100 / 59. 9.100
libavformat 59. 5.100 / 59. 5.100
libavdevice 59. 0.101 / 59. 0.101
libavfilter 8. 9.100 / 8. 9.100
libswscale 6. 1.100 / 6. 1.100
libswresample 4. 0.100 / 4. 0.100
libpostproc 56. 0.100 / 56. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test_labeled.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf59.5.100
Duration: 00:00:08.57, start: 0.000000, bitrate: 432 kb/s
Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661),
yuv420p(tv, bt709), 1280x720 [SAR 1:1 DAR 16:9], 79 kb/s, 30 fps, 30 tbr,
12k tbn (default)
Metadata:
handler_name : VideoHandler
vendor_id : [0][0][0][0]
Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 128 kb/s (default)
Metadata:
handler_name : SoundHandler
vendor_id : [0][0][0][0]
Stream #0:2[0x3](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 127 kb/s (default)
Metadata:
handler_name : SoundHandler
vendor_id : [0][0][0][0]
Stream #0:3[0x4](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 127 kb/s (default)
Metadata:
handler_name : SoundHandler
vendor_id : [0][0][0][0]
}}}
Expect stream metadata should have title field. Thanks.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/9438>
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