Flash Tutorials - Herong's Tutorial Examples - v3.03, by Dr. Herong Yang
Split Audio Stream Out of SWF File
This section provides a tutorial example on how to split the audio stream out of a stream SMF file. '-map 0:0' option is used to select the first stream (audio stream) of the first input file into the output file.
Another common task of manipulating stream SWF files is to split off the audio stream to a new SWF file or MP3 file. This can be done easily with the "ffmpeg" command:
C:\herong>\local\ffmpeg\bin\ffmpeg -i input.swf -map 0:0 output.swf
The above command uses "-map 0:0" to specify the first stream (audio stream) of the first input file to be mapped to the output file. You can specify "output.mp3" to get a MP3 output file.
Let's try it on our sample SWF file, Anchor_and_Spider_Man.swf:
C:\herong>\local\ffmpeg\bin\ffmpeg -i Anchor_and_Spider_Man.swf -map 0:0 Audio_with_No_Video.swf Input #0, swf, from 'Anchor_and_Spider_Man.swf': Duration: 00:02:04.08, start: 0.000000, bitrate: 127 kb/s Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s Stream #0:1: Video: flv1, yuv420p, 416x240, 25 fps, 25 tbr, 25 tbn Output #0, swf, to 'Audio_with_No_Video.swf': Metadata: encoder : Lavf55.40.100 Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, s16p Metadata: encoder : Lavc55.63.100 libmp3lame Stream mapping: Stream #0:0 -> #0:0 (mp3 -> libmp3lame) Press [q] to stop, [?] for help size= 634kB time=00:00:39.44 bitrate= 131.8kbits/s video:0kB audio:617kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.875846%
Check the output file with "swfdump" command from SWFTools first:
C:\herong>\local\SWFTools\swfdump Audio_with_No_Video.swf
==== Error: Real Filesize (649698) doesn't match header
Filesize (104857600) ====
[HEADER] File version: 4
[HEADER] File size: 104857600
[HEADER] Frame rate: 10.000000
[HEADER] Frame count: 6000
[HEADER] Movie width: 320.00
[HEADER] Movie height: 200.00
[02d] 6 SOUNDSTREAMHEAD2
[013] 421 SOUNDSTREAMBLOCK
[001] 0 SHOWFRAME 1 (00:00:00,000)
[013] 422 SOUNDSTREAMBLOCK
[001] 0 SHOWFRAME 2 (00:00:00,100)
[013] 422 SOUNDSTREAMBLOCK
[001] 0 SHOWFRAME 3 (00:00:00,200)
...
[013] 422 SOUNDSTREAMBLOCK
[001] 0 SHOWFRAME 1511 (00:02:30,994)
Notes on the SWF dump file:
Check the output file with "ffprobe" command from FFmpeg package:
C:\herong>\local\ffmpeg\bin\ffprobe Audio_with_No_Video.swf
...
Input #0, swf, from 'Audio_with_No_Video.swf':
Duration: 00:00:40.61, bitrate: 128 kb/s
Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
Now play it with projector with Flash Player Projector:
C:\herong>\local\bin\flashplayer_13_sa Audio_with_No_Video.swf
Enjoy the music! It will last for about 40.61 seconds.
Table of Contents
Adobe Flash Player Plugin for Firefox
Adobe Flash Player Plugin for Chrome
Adobe Flash Player Plugin for Safari
Adobe Flash Player ActiveX for IE
Using "object" Elements for Flash Files
Using "embed" Elements for Flash Files
"mp3player" - MP3 Music Player
SWFObject - Hidding "object" behind JavaScript
SWFTools - SWF File Manipulation Tools
SWFC Script to Generate Flash SWF Files
ActionScript Embedded in SWFC Script
AS3Compile - ActionScript 3 Compiler
►SWF Files for Video and Audio Streams
Video and Audio Stream SWF File Structure
Installing FFmpeg to Manipulate Video SWF Files
Playing Movie with FFmpeg "ffplay" Command
See File Properties with FFmpeg "ffprobe" Command
Convert File Format with "ffmpeg" Command
Issue with "ffplay" on SWF Output File
Break Long Video into Parts with "ffmpeg"
Concatenate Video Files with "ffmpeg"
Video/Audio Stream Concatenation Order
►Split Audio Stream Out of SWF File
Split Video Stream Out of SWF File
Merge Video and Audio Streams to SWF File