Extract Audio From a Video Using FFmpeg

by Bramante - - | Comments

使用FFmpeg可以很容易地把Audio由TS file裡頭給分離出來, 如果Audio是使用MPEG Audio來Encode的, 那麼把分離出的Audio另存成*.mp3的file, 就可以直接用一般的軟體來播放.

以下是操作範例:

Terminal
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bramante@matrix:~/test/audio$ ll
total 10592
drwxrwxr-x 2 bramante bramante     4096 Aug 24 17:52 ./
drwxrwxr-x 4 bramante bramante     4096 Aug 24 17:51 ../
-rwxrw-rw- 1 bramante bramante 10834252 Aug 24 17:25 demo.ts*
bramante@matrix:~/test/audio$ ffmpeg -i demo.ts -acodec copy demo.mp3
ffmpeg version 0.8.17-4:0.8.17-0ubuntu0.12.04.1, Copyright (c) 2000-2014 the Libav developers
  built on Mar 16 2015 13:26:50 with gcc 4.6.3
The ffmpeg program is only provided for script compatibility and will be removed
in a future release. It has been deprecated in the Libav project to allow for
incompatible command line syntax improvements in its replacement called avconv
(see Changelog for details). Please use avconv instead.
[mp3 @ 0x86dd60] Header missing
[mpegts @ 0x8337a0] max_analyze_duration reached
[NULL @ 0x878c40] start time is not set in estimate_timings_from_pts
[mpegts @ 0x8337a0] Continuity check failed for pid 18 expected 9 got 7
[mpegts @ 0x8337a0] Continuity check failed for pid 1601 expected 13 got 2
Input #0, mpegts, from 'demo.ts':
  Duration: 26:30:41.26, start: 50944.346833, bitrate: 0 kb/s
  Program 25664
  Program 25728
  Program 25792
  Program 25856
  Program 25920
  Program 26240
  Program 26368
  Program 26560
  Program 27136
  Program 27168
  Program 27360
  Program 27456
  Program 27520
  Program 27584
  Program 27648
  Program 27680
  Program 27712
  Program 27744
  Program 27840
  Program 27872
  Program 27904
  Program 28032
  Program 28096
  Program 28160
    Stream #0.0[0x641](eng): Audio: mp2, 48000 Hz, mono, s16, 64 kb/s
    Stream #0.1[0x642]: Data: [11][0][0][0] / 0x000B
  Program 28288
  Program 28320
  Program 28352
  Program 28384
  Program 28416
  Program 28480
  Program 28512
Output #0, mp3, to 'demo.mp3':
  Metadata:
    TSSE            : Lavf53.21.1
    Stream #0.0(eng): Audio: mp2, 48000 Hz, mono, 64 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
Press ctrl-c to stop encoding
[mpegts @ 0x8337a0] Continuity check failed for pid 20 expected 15 got 3
[mpegts @ 0x8337a0] Continuity check failed for pid 20 expected 5 got 9
[mpegts @ 0x8337a0] Continuity check failed for pid 20 expected 11 got 15
[mpegts @ 0x8337a0] Continuity check failed for pid 20 expected 1 got 5
[mpegts @ 0x8337a0] Continuity check failed for pid 0 expected 10 got 11
[mpegts @ 0x8337a0] Continuity check failed for pid 1601 expected 9 got 6
[mpegts @ 0x8337a0] Continuity check failed for pid 18 expected 3 got 13
[mpegts @ 0x8337a0] Continuity check failed for pid 18 expected 14 got 1
[mpegts @ 0x8337a0] Continuity check failed for pid 1602 expected 12 got 10
[mpegts @ 0x8337a0] Continuity check failed for pid 16 expected 11 got 5
[mpegts @ 0x8337a0] Continuity check failed for pid 20 expected 7 got 13
[mpegts @ 0x8337a0] Continuity check failed for pid 20 expected 15 got 3
[mpegts @ 0x8337a0] Continuity check failed for pid 20 expected 5 got 9
[mpegts @ 0x8337a0] Continuity check failed for pid 20 expected 11 got 15
[mpegts @ 0x8337a0] Continuity check failed for pid 20 expected 1 got 5
[mpegts @ 0x8337a0] Continuity check failed for pid 18 expected 9 got 7
[mpegts @ 0x8337a0] Continuity check failed for pid 1601 expected 13 got 2
size=     865kB time=110.69 bitrate=  64.0kbits/s
video:0kB audio:865kB global headers:0kB muxing overhead 0.014569%
bramante@matrix:~/test/audio$ ll
total 11460
drwxrwxr-x 2 bramante bramante     4096 Aug 24 17:53 ./
drwxrwxr-x 4 bramante bramante     4096 Aug 24 17:51 ../
-rw-rw-r-- 1 bramante bramante   885585 Aug 24 17:53 demo.mp3
-rwxrw-rw- 1 bramante bramante 10834252 Aug 24 17:25 demo.ts*
bramante@matrix:~/test/audio$ mediainfo demo.mp3
General
Complete name                            : demo.mp3
Format                                   : MPEG Audio
File size                                : 865 KiB
Duration                                 : 1mn 50s
Overall bit rate mode                    : Constant
Overall bit rate                         : 64.0 Kbps
Encoding settings                        : Lavf53.21.1

Audio
Format                                   : MPEG Audio
Format version                           : Version 1
Format profile                           : Layer 2
Duration                                 : 1mn 50s
Bit rate mode                            : Constant
Bit rate                                 : 64.0 Kbps
Channel(s)                               : 1 channel
Sampling rate                            : 48.0 KHz
Compression mode                         : Lossy
Stream size                              : 864 KiB (100%)


bramante@matrix:~/test/audio$

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