我在 ubuntu 16.04lts 上用 mininet 模拟器创建了一个网络。在这个网络中，我想在两个主机之间传输视频。我在发送方主机中使用了 vlc，在接收方主机中使用了 ffmpeg。但问题是视频传输成功了，但声音没有传输。正常情况下，当我用 VLC 播放视频时，有声音和视频，但接收方主机接收到的视频没有声音。当我运行 VLC 时，出现以下错误：
[b4e00650] stream_out_rtp stream out error: cannot add this stream (unsupported codec: mp3 )
[b4e0c738] main decoder error: cannot continue streaming due to errors with codec mpga
[013a5d78] main input error: ES_OUT_SET_(GROUP_)PCR is called too late (pts_delay increased to 300 ms)
[b4e0c738] main decoder error: buffer deadlock prevented
在整个视频发送完成后，Receiver主机中接收到的语音量被设置为零。
video:41700kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.329261%
我安装了：
sudo apt-get install ubuntu-restricted-extras
但没有结果。
vlc 版本是：VLC media player 3.0.2 Vetinari (revision 3.0.2-0-gd7b653cf14)
Ffmpeg 版本是：
sana@sana:~$ ffmpeg -formats
ffmpeg version 3.4.git-static https://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libfribidi --enable-libass --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg
libavutil 56. 18.102 / 56. 18.102
libavcodec 58. 19.101 / 58. 19.101
libavformat 58. 13.102 / 58. 13.102
libavdevice 58. 4.100 / 58. 4.100
libavfilter 7. 22.100 / 7. 22.100
libswscale 5. 2.100 / 5. 2.100
libswresample 3. 2.100 / 3. 2.100
libpostproc 55. 2.100 / 55. 2.100
File formats:
D. = Demuxing supported
.E = Muxing supported
--
D 3dostr 3DO STR
E 3g2 3GP2 (3GPP2 file format)
E 3gp 3GP (3GPP file format)
D 4xm 4X Technologies
E a64 a64 - video for Commodore 64
D aa Audible AA format files
D aac raw ADTS AAC (Advanced Audio Coding)
DE ac3 raw AC-3
D acm Interplay ACM
D act ACT Voice file format
D adf Artworx Data Format
D adp ADP
D ads Sony PS2 ADS
E adts ADTS AAC (Advanced Audio Coding)
DE adx CRI ADX
D aea MD STUDIO audio
D afc AFC
DE aiff Audio IFF
D aix CRI AIX
DE alaw PCM A-law
D alias_pix Alias/Wavefront PIX image
DE alsa ALSA audio output
DE amr 3GPP AMR
D amrnb raw AMR-NB
D amrwb raw AMR-WB
D anm Deluxe Paint Animation
D apc CRYO APC
D ape Monkey's Audio
DE apng Animated Portable Network Graphics
DE aptx raw aptX (Audio Processing Technology for Bluetooth)
DE aptx_hd raw aptX HD (Audio Processing Technology for Bluetooth)
D aqtitle AQTitle subtitles
DE asf ASF (Advanced / Active Streaming Format)
D asf_o ASF (Advanced / Active Streaming Format)
E asf_stream ASF (Advanced / Active Streaming Format)
DE ass SSA (SubStation Alpha) subtitle
DE ast AST (Audio Stream)
DE au Sun AU
DE avi AVI (Audio Video Interleaved)
E avm2 SWF (ShockWave Flash) (AVM2)
D avr AVR (Audio Visual Research)
D avs AVS
D bethsoftvid Bethesda Softworks VID
D bfi Brute Force & Ignorance
D bfstm BFSTM (Binary Cafe Stream)
D bin Binary text
D bink Bink
DE bit G.729 BIT file format
D bmp_pipe piped bmp sequence
D bmv Discworld II BMV
D boa Black Ops Audio
D brender_pix BRender PIX image
D brstm BRSTM (Binary Revolution Stream)
D c93 Interplay C93
DE caf Apple CAF (Core Audio Format)
DE cavsvideo raw Chinese AVS (Audio Video Standard) video
D cdg CD Graphics
D cdxl Commodore CDXL video
D cine Phantom Cine
DE codec2 codec2 .c2 muxer
DE codec2raw raw codec2 muxer
D concat Virtual concatenation script
E crc CRC testing
DE dash DASH Muxer
DE data raw data
DE daud D-Cinema audio
D dcstr Sega DC STR
D dds_pipe piped dds sequence
D dfa Chronomaster DFA
DE dirac raw Dirac
DE dnxhd raw DNxHD (SMPTE VC-3)
D dpx_pipe piped dpx sequence
D dsf DSD Stream File (DSF)
D dsicin Delphine Software International CIN
D dss Digital Speech Standard (DSS)
DE dts raw DTS
D dtshd raw DTS-HD
DE dv DV (Digital Video)
D dvbsub raw dvbsub
D dvbtxt dvbtxt
E dvd MPEG-2 PS (DVD VOB)
D dxa DXA
D ea Electronic Arts Multimedia
D ea_cdata Electronic Arts cdata
DE eac3 raw E-AC-3
D epaf Ensoniq Paris Audio File
D exr_pipe piped exr sequence
DE f32be PCM 32-bit floating-point big-endian
DE f32le PCM 32-bit floating-point little-endian
E f4v F4V Adobe Flash Video
DE f64be PCM 64-bit floating-point big-endian
DE f64le PCM 64-bit floating-point little-endian
DE fbdev Linux framebuffer
DE ffmetadata FFmpeg metadata in text
E fifo FIFO queue pseudo-muxer
E fifo_test Fifo test muxer
DE film_cpk Sega FILM / CPK
DE filmstrip Adobe Filmstrip
DE fits Flexible Image Transport System
DE flac raw FLAC
D flic FLI/FLC/FLX animation
DE flv FLV (Flash Video)
E framecrc framecrc testing
E framehash Per-frame hash testing
E framemd5 Per-frame MD5 testing
D frm Megalux Frame
D fsb FMOD Sample Bank
DE g722 raw G.722
DE g723_1 raw G.723.1
DE g726 raw big-endian G.726 ("left-justified")
DE g726le raw little-endian G.726 ("right-justified")
D g729 G.729 raw format demuxer
D gdv Gremlin Digital Video
D genh GENeric Header
DE gif GIF Animation
DE gsm raw GSM
DE gxf GXF (General eXchange Format)
DE h261 raw H.261
DE h263 raw H.263
DE h264 raw H.264 video
E hash Hash testing
E hds HDS Muxer
DE hevc raw HEVC video
E hls Apple HTTP Live Streaming
D hls,applehttp Apple HTTP Live Streaming
D hnm Cryo HNM v4
DE ico Microsoft Windows ICO
D idcin id Cinematic
D idf iCE Draw File
D iff IFF (Interchange File Format)
DE ilbc iLBC storage
DE image2 image2 sequence
DE image2pipe piped image2 sequence
D ingenient raw Ingenient MJPEG
D ipmovie Interplay MVE
E ipod iPod H.264 MP4 (MPEG-4 Part 14)
DE ircam Berkeley/IRCAM/CARL Sound Format
E ismv ISMV/ISMA (Smooth Streaming)
D iss Funcom ISS
D iv8 IndigoVision 8000 video
DE ivf On2 IVF
D ivr IVR (Internet Video Recording)
D j2k_pipe piped j2k sequence
DE jacosub JACOsub subtitle format
D jpeg_pipe piped jpeg sequence
D jpegls_pipe piped jpegls sequence
D jv Bitmap Brothers JV
E latm LOAS/LATM
D lavfi Libavfilter virtual input device
D live_flv live RTMP FLV (Flash Video)
D lmlm4 raw lmlm4
D loas LOAS AudioSyncStream
DE lrc LRC lyrics
D lvf LVF
D lxf VR native stream (LXF)
DE m4v raw MPEG-4 video
E matroska Matroska
D matroska,webm Matroska / WebM
E md5 MD5 testing
D mgsts Metal Gear Solid: The Twin Snakes
DE microdvd MicroDVD subtitle format
DE mjpeg raw MJPEG video
D mjpeg_2000 raw MJPEG 2000 video
E mkvtimestamp_v2 extract pts as timecode v2 format, as defined by mkvtoolnix
DE mlp raw MLP
D mlv Magic Lantern Video (MLV)
D mm American Laser Games MM
DE mmf Yamaha SMAF
E mov QuickTime / MOV
D mov,mp4,m4a,3gp,3g2,mj2 QuickTime / MOV
E mp2 MP2 (MPEG audio layer 2)
DE mp3 MP3 (MPEG audio layer 3)
E mp4 MP4 (MPEG-4 Part 14)
D mpc Musepack
D mpc8 Musepack SV8
DE mpeg MPEG-1 Systems / MPEG program stream
E mpeg1video raw MPEG-1 video
E mpeg2video raw MPEG-2 video
DE mpegts MPEG-TS (MPEG-2 Transport Stream)
D mpegtsraw raw MPEG-TS (MPEG-2 Transport Stream)
D mpegvideo raw MPEG video
DE mpjpeg MIME multipart JPEG
D mpl2 MPL2 subtitles
D mpsub MPlayer subtitles
D msf Sony PS3 MSF
D msnwctcp MSN TCP Webcam stream
D mtaf Konami PS2 MTAF
D mtv MTV
DE mulaw PCM mu-law
D musx Eurocom MUSX
D mv Silicon Graphics Movie
D mvi Motion Pixels MVI
DE mxf MXF (Material eXchange Format)
E mxf_d10 MXF (Material eXchange Format) D-10 Mapping
E mxf_opatom MXF (Material eXchange Format) Operational Pattern Atom
D mxg MxPEG clip
D nc NC camera feed
D nistsphere NIST SPeech HEader REsources
D nsp Computerized Speech Lab NSP
D nsv Nullsoft Streaming Video
E null raw null video
DE nut NUT
D nuv NuppelVideo
E oga Ogg Audio
DE ogg Ogg
E ogv Ogg Video
DE oma Sony OpenMG audio
E opus Ogg Opus
DE oss OSS (Open Sound System) playback
D paf Amazing Studio Packed Animation File
D pam_pipe piped pam sequence
D pbm_pipe piped pbm sequence
D pcx_pipe piped pcx sequence
D pgm_pipe piped pgm sequence
D pgmyuv_pipe piped pgmyuv sequence
D pictor_pipe piped pictor sequence
D pjs PJS (Phoenix Japanimation Society) subtitles
D pmp Playstation Portable PMP
D png_pipe piped png sequence
D ppm_pipe piped ppm sequence
D psd_pipe piped psd sequence
E psp PSP MP4 (MPEG-4 Part 14)
D psxstr Sony Playstation STR
D pva TechnoTrend PVA
D pvf PVF (Portable Voice Format)
D qcp QCP
D qdraw_pipe piped qdraw sequence
D r3d REDCODE R3D
DE rawvideo raw video
D realtext RealText subtitle format
D redspark RedSpark
D rl2 RL2
DE rm RealMedia
DE roq raw id RoQ
D rpl RPL / ARMovie
D rsd GameCube RSD
DE rso Lego Mindstorms RSO
DE rtp RTP output
E rtp_mpegts RTP/mpegts output format
DE rtsp RTSP output
DE s16be PCM signed 16-bit big-endian
DE s16le PCM signed 16-bit little-endian
DE s24be PCM signed 24-bit big-endian
DE s24le PCM signed 24-bit little-endian
DE s32be PCM signed 32-bit big-endian
DE s32le PCM signed 32-bit little-endian
D s337m SMPTE 337M
DE s8 PCM signed 8-bit
D sami SAMI subtitle format
DE sap SAP output
DE sbc raw SBC
D sbg SBaGen binaural beats script
DE scc Scenarist Closed Captions
D sdp SDP
D sdr2 SDR2
D sds MIDI Sample Dump Standard
D sdx Sample Dump eXchange
E segment segment
D sgi_pipe piped sgi sequence
D shn raw Shorten
D siff Beam Software SIFF
E singlejpeg JPEG single image
D sln Asterisk raw pcm
DE smjpeg Loki SDL MJPEG
D smk Smacker
E smoothstreaming Smooth Streaming Muxer
D smush LucasArts Smush
D sol Sierra SOL
DE sox SoX native
DE spdif IEC 61937 (used on S/PDIF - IEC958)
E spx Ogg Speex
DE srt SubRip subtitle
D stl Spruce subtitle format
E stream_segment,ssegment streaming segment muxer
D subviewer SubViewer subtitle format
D subviewer1 SubViewer v1 subtitle format
D sunrast_pipe piped sunrast sequence
DE sup raw HDMV Presentation Graphic Stream subtitles
D svag Konami PS2 SVAG
E svcd MPEG-2 PS (SVCD)
D svg_pipe piped svg sequence
DE swf SWF (ShockWave Flash)
D tak raw TAK
D tedcaptions TED Talks captions
E tee Multiple muxer tee
D thp THP
D tiertexseq Tiertex Limited SEQ
D tiff_pipe piped tiff sequence
D tmv 8088flex TMV
DE truehd raw TrueHD
DE tta TTA (True Audio)
D tty Tele-typewriter
D txd Renderware TeXture Dictionary
D ty TiVo TY Stream
DE u16be PCM unsigned 16-bit big-endian
DE u16le PCM unsigned 16-bit little-endian
DE u24be PCM unsigned 24-bit big-endian
DE u24le PCM unsigned 24-bit little-endian
DE u32be PCM unsigned 32-bit big-endian
DE u32le PCM unsigned 32-bit little-endian
DE u8 PCM unsigned 8-bit
E uncodedframecrc uncoded framecrc testing
D v210 Uncompressed 4:2:2 10-bit
D v210x Uncompressed 4:2:2 10-bit
E v4l2 Video4Linux2 output device
D vag Sony PS2 VAG
DE vc1 raw VC-1 video
DE vc1test VC-1 test bitstream
E vcd MPEG-1 Systems / MPEG program stream (VCD)
D video4linux2,v4l2 Video4Linux2 device grab
D vivo Vivo
D vmd Sierra VMD
E vob MPEG-2 PS (VOB)
D vobsub VobSub subtitle format
DE voc Creative Voice
D vpk Sony PS2 VPK
D vplayer VPlayer subtitles
D vqf Nippon Telegraph and Telephone Corporation (NTT) TwinVQ
DE w64 Sony Wave64
DE wav WAV / WAVE (Waveform Audio)
D wc3movie Wing Commander III movie
E webm WebM
E webm_chunk WebM Chunk Muxer
DE webm_dash_manifest WebM DASH Manifest
E webp WebP
D webp_pipe piped webp sequence
DE webvtt WebVTT subtitle
D wsaud Westwood Studios audio
D wsd Wideband Single-bit Data (WSD)
D wsvqa Westwood Studios VQA
DE wtv Windows Television (WTV)
DE wv raw WavPack
D wve Psion 3 audio
D x11grab X11 screen capture, using XCB
D xa Maxis XA
D xbin eXtended BINary text (XBIN)
D xmv Microsoft XMV
D xpm_pipe piped xpm sequence
D xvag Sony PS3 XVAG
D xwma Microsoft xWMA
D yop Psygnosis YOP
DE yuv4mpegpipe YUV4MPEG pipe
sana@sana:~$