在 Ubuntu 12.04 LTS 中我使用过-movflags frag_keyframe+empty_moov在我的 ffmpeg 命令中：
ffmpeg -i http://filesbe.vocativ.internal.net/03/44/SN/q1/xg/xl/0344SNq1xgxl.flv \
-crf 32.0 -g 250 -keyint_min 25 -aspect 4:3 -movflags frag_keyframe -vcodec \
libx264 -acodec aac -strict experimental -ar 44100 -ac 2 -b:a 128k -map 0:0 \
-map 0:1 -f flv -y test.flv
ffmpeg version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
built on Apr 2 2013 17:02:36 with gcc 4.6.3
*** THIS PROGRAM IS DEPRECATED ***
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
[flv @ 0x10569a0] Estimating duration from bitrate, this may be inaccurate
Input #0, flv, from 'http://filesbe.vocativ.internal.net/03/44/SN/q1/xg/xl/0344SNq1xgxl.flv':
Metadata:
starttime : 0
totalduration : 64
totaldatarate : 710
bytelength : 5674798
canseekontime : true
sourcedata : BADC23401MH1326550770698632
purl :
pmsg :
Duration: 00:01:03.96, start: 0.000000, bitrate: 718 kb/s
Stream #0.0: Video: h264 (Main), yuv420p, 854x480, 590 kb/s, 25 tbr, 1k tbn, 50 tbc
Stream #0.1: Audio: aac, 44100 Hz, stereo, s16, 128 kb/s
[buffer @ 0x105c600] w:854 h:480 pixfmt:yuv420p
[movie @ 0x105c440] seek_point:0 format_name:(null) file_name:/home/assetproxy/htdocs/transcoder/helper_asset/voca_scaled.png stream_index:0
[overlay @ 0x1060840] auto-inserting filter 'auto-inserted scaler 0' between the filter 'Parsed filter 0 movie' and the filter 'Parsed filter 1 overlay'
[scale @ 0x11d8300] w:90 h:51 fmt:rgb24 -> w:90 h:51 fmt:yuva420p flags:0x4
[overlay @ 0x1060840] main w:854 h:480 fmt:yuv420p overlay x:754 y:419 w:90 h:51 fmt:yuva420p
[overlay @ 0x1060840] main_tb:1/1000000 overlay_tb:1/25 -> tb:1/1000000 exact:1
[libx264 @ 0x1059d20] using SAR=191/255
[libx264 @ 0x1059d20] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
[libx264 @ 0x1059d20] profile Main, level 3.0
[libx264 @ 0x1059d20] 264 - core 120 r2151 a3f4407 - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=6 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=0 b_adapt=1 b_bias=0 direct=1 weightb=0 open_gop=1 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=32.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.41 aq=1:1.00
Option movflags not found.
首先，您实际上并没有使用 FFmpeg 中的 ffmpeg，而是来自 fork 的旧且过时的版本，该版本没有-movflags选项。你需要更新你的 ffmpeg：你可以简单地下载 ffmpeg 的 Linux 版本 http://ffmpeg.org/download.html#LinuxBuilds (see 详细说明 https://askubuntu.com/a/270107/59378），或者您可以按照步骤进行操作Ubuntu 上编译 ffmpeg 的指南 http://trac.ffmpeg.org/wiki/UbuntuCompilationGuide.
另请参阅：
-
谁能告诉我ffmpeg、libav、avconv之间的区别和关系？ https://stackoverflow.com/a/9477756/1109017
-
FFmpeg 和 x264 编码指南 https://trac.ffmpeg.org/wiki/x264EncodingGuide
- FFmpeg 和 AAC 编码指南 https://trac.ffmpeg.org/wiki/AACEncodingGuide
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