在ffmpeg中具有混合音轨的文件上添加其他音频 [英] Add another audio over a file with mixed audio tracks in ffmpeg
问题描述
我有一个通过串联三个不同文件形成的文件: a.mp4 ， b.mp4 和 c.mp4 ./p>
I have a file that was formed by concatenating three different files: a.mp4, b.mp4 and c.mp4.
do ffmpeg -f concat -i "concat-file.txt" -map 0:v -map 0:a -c:v libx264 -crf 23 -fflags +genpts joined-file.mp4"
After that I run this command, mentioned here: How to add a new audio (not mixing) into a video using ffmpeg?
ffmpeg -i joined-file.mp4 -i audio.mp3 -filter_complex "[0:a][1:a]amerge=inputs=2[a]" -map 0:v -map "[a]" -c:v copy -ac 2 -shortest output.mp4
是什么原因导致此问题?
What is causing this issue?
谢谢.:)
更新:
这是我一直在运行的命令:
Here are the commands that I have been running:
ffmpeg -i "middle/b.mp4" -c:v copy -video_track_timescale 30k -c:a aac -ac 6 -ar 44100 -shortest "wrap/b.mp4"
ffmpeg -f concat -i "concat-file.txt" -map 0:v -map 0:a -c:v libx264 -crf 23 -fflags +genpts "joined/abc.mp4"
ffmpeg -i "joined/abc.mp4" -i audio.mp3 -filter_complex "[0:a:0][1:a:0]amerge=inputs=2[a]" -map 0:v -map "[a]" -c:v copy -ac 2 -shortest "final/abc-cmplt.mp4"
这是"concat-file.txt":
Here is the "concat-file.txt":
file 'bits/a.mp4'
file 'wrap/b.mp4'
file 'bits/c.mp4'
所有视频文件 a.mp4 ， b.mp4 和 c.mp4 均具有其原始音频.运行上述命令后，联合视频 abc-cmplt.mp4 组合了第一部分(a.mp4)和最后部分(c.mp4)的音频(audio.mp3加上他们自己的).但是，中间部分只有自己的音频，而我尝试添加的额外音频似乎没有与最终联合文件中的 b.mp4 音频合并.
All the video files a.mp4, b.mp4 and c.mp4 have their original audio. After I run the commands above, the joint video abc-cmplt.mp4 has combined audio (audio.mp3 plus their own) for the first (a.mp4) and last parts (c.mp4). However, the middle part only has its own audio and the extra audio I am trying to add does not seem to merge with the audio of b.mp4 in the final joint file.
ffmpeg -i bits/a.mp4 -i wrap/b.mp4 -i bits/c.mp4 的输出:
ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 9.2.1 (GCC) 20200122
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. 31.100 / 56. 31.100
libavcodec 58. 54.100 / 58. 54.100
libavformat 58. 29.100 / 58. 29.100
libavdevice 58. 8.100 / 58. 8.100
libavfilter 7. 57.100 / 7. 57.100
libswscale 5. 5.100 / 5. 5.100
libswresample 3. 5.100 / 3. 5.100
libpostproc 55. 5.100 / 55. 5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'bits/a.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42mp41
creation_time : 2021-03-10T08:50:04.000000Z
Duration: 00:00:01.05, start: 0.000000, bitrate: 1846 kb/s
Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1080x1920 [SAR 1:1 DAR 9:16], 1462 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
Metadata:
creation_time : 2021-03-10T08:50:04.000000Z
handler_name : ?Mainconcept Video Media Handler
encoder : AVC Coding
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
Metadata:
creation_time : 2021-03-10T08:50:04.000000Z
handler_name : #Mainconcept MP4 Sound Media Handler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'wrap/b.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.29.100
Duration: 00:00:27.93, start: 0.000000, bitrate: 234 kb/s
Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1080x1920, 231 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
Metadata:
handler_name : VideoHandler
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'bits/c.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42mp41
creation_time : 2021-03-10T08:42:52.000000Z
Duration: 00:00:01.05, start: 0.000000, bitrate: 1829 kb/s
Stream #2:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1080x1920 [SAR 1:1 DAR 9:16], 1320 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
Metadata:
creation_time : 2021-03-10T08:42:52.000000Z
handler_name : ?Mainconcept Video Media Handler
encoder : AVC Coding
Stream #2:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
Metadata:
creation_time : 2021-03-10T08:42:52.000000Z
handler_name : #Mainconcept MP4 Sound Media Handler
推荐答案
要由这些相同的属性. b.mp4 具有不同的H.264配置文件，并且没有音频.解决该问题:
All files to be concatenated by the concat demuxer must have these same attributes. b.mp4 has a different H.264 profile and lacks audio. Fix that:
ffmpeg -i "middle/b.mp4" -f lavfi -i anullsrc=cl=stereo:r=48000 -c:v libx264 -profile:v main -video_track_timescale 30k -shortest "wrap/b.mp4"
然后连接并混合音频:
ffmpeg -f concat -i "concat-file.txt" -i audio.mp3 -c:v libx264 -crf 23 -filter_complex "[0:a:0][1:a:0]amerge=inputs=2" -ac 2 "joined/abc.mp4"
| 选项 | 说明 |
|---|---|
-f lavfi | 告诉ffmpeg以下输入是过滤器而不是文件. |
-i anullsrc = cl = stereo:r = 48000 | 使用 anullsrc 过滤器生成48000采样率的无声立体声音频./td> |
-profile:v main | 将 H.264配置文件设置为 Main . |
-video_track_timescale 30k | 将时间比例设置为30k，以匹配其他视频( 30000 tbn ). |
| Option | Description |
|---|---|
-f lavfi |
Tell ffmpeg the following input is a filter instead of a file. |
-i anullsrc=cl=stereo:r=48000 |
Use the anullsrc filter to generate silent stereo audio with 48000 sample rate. |
-profile:v main |
Set H.264 Profile to Main. |
-video_track_timescale 30k |
Set timescale to 30k to match the other videos (30k tbn). |
这篇关于在ffmpeg中具有混合音轨的文件上添加其他音频的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
