ffmpeg mp4 x264編碼 - >在Chrome和IE瀏覽器中導致「掛起」導致延遲10+秒

Question

在將視頻編碼爲mp4（帶aac的x264）後;我在crome和IE中都有以下奇怪的行爲：

Im從https使用spdy啓用內容。

實際播放視頻需要長達30秒的時間，同時我無法重新載入顯示爲「正在等待」的頁面。 （即使我有視頻視頻有時需要10-20秒才能實際重新加載頁面，或導航到同一域上的另一個網址）

在開發人員工具中查看「網絡」選項卡後，我看到1頁/視頻以下要求：

Path  Method Status Type   Initiator Size/content Time/latency 
video.mp4 GET 206 OK video/mp4 other  32.3KB/32.0kb 600ms/339MS 
video.mp4 GET 206 OK video/mp4 other  123kb/123b  21.85s/21.46s 
video.mp4 GET 206 OK video/mp4 other  7.1MB/7.2MB 1.4min/2ms 

我試圖找出問題，當我使用的MP4視頻從互聯網（例如jplayer的演示視頻），並從我的服務器加載它，它迅速加載，沒有延遲。

所以這讓我覺得問題在於編碼。我嘗試過各種事情。 FFmpeg的：

• CSR 69（低質量）

• 各種選項

HTML：

• 預載= 「無」

• 的JavaScript加載/電影

• 類型的遊戲= 'MP4 /視頻'

• 沒有posterimage

但我能不能解決問題。有沒有人有線索是什麼造成這種情況？

我有一個300kb/s的下載速度和電影是6MB。

視頻開始後，視頻沒有完全緩衝，所以我想知道：什麼是html5 videoplayer一直在做什麼？

該問題還會阻止連接。當我在Chrome和IE中按下「F5」時，頁面重新加載的頁面在網絡標籤中顯示爲「掛起」，並且在頁面實際重新加載之前可能需要10到20秒。

ffmpeg的命令：（ⅰ使用的各種命令，但這只是1例，其引起該問題）

/root/bin/ffmpeg -threads 1 -y -i /home/flirtzo/public_html//userfiles/files/94e76a18a7838e62ecb23cf0c374b1b798e7b936 -threads 0 -codec:a libfdk_aac -b:a 128k -vf "scale=-2:320" -preset veryslow -vcodec h264 -acodec aac -strict -2 /home/flirtzo/public_html/userfiles/files/b2/72/695f4eba95169a3f29564bf9571c703b05f1b5974f5156da633eb139c80a1575452e2858dfc61cc82bfca02d2b156aa64d4503695756481dc2a5d1c673a4cdea-94e76a18a7838e62ecb23cf0c374b1b798e7b936.mp4 

輸出：

ffmpeg version git-2014-04-16-c150e2c Copyright (c) 2000-2014 the FFmpeg developers 
    built on Sep 28 2014 21:08:17 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-4) 
    configuration: --prefix=/root/ffmpeg_build --extra-cflags=-I/root/ffmpeg_build/include --extra-  ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --extra-libs=-ldl --enable-gpl --enable-nonfree - -enable-libfdk_aac --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable- libx264 
    libavutil  52. 76.100/52. 76.100 
    libavcodec  55. 58.103/55. 58.103 
    libavformat 55. 37.100/55. 37.100 
    libavdevice 55. 13.100/55. 13.100 
    libavfilter  4. 4.100/4. 4.100 
    libswscale  2. 6.100/2. 6.100 
    libswresample 0. 18.100/0. 18.100 
    libpostproc 52. 3.100/52. 3.100 
Input #0, mpeg, from   '/home/flirtzo/public_html//userfiles/files/94e76a18a7838e62ecb23cf0c374b1b798e7b936': 
    Duration: 00:00:25.97, start: 0.340078, bitrate: 29004 kb/s 
    Stream #0:0[0x1e0]: Video: mpeg1video, yuv420p(tv), 352x240 [SAR 200:219 DAR 880:657], 1150  kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 29.97 tbc 
    Stream #0:1[0x1c0]: Audio: mp2, 44100 Hz, stereo, s16p, 224 kb/s 
[libx264 @ 0x2b189c0] using SAR=1199/1314 
[libx264 @ 0x2b189c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX 
[libx264 @ 0x2b189c0] profile High, level 1.3 
[libx264 @ 0x2b189c0] 264 - core 142 r2 d6b4e63 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 -  http://www.videolan.org/x264.html - options: cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x113 me=hex  subme=4 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0  deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=12 lookahead_threads=1 sliced_threads=0 nr=0  decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0  direct=1 weightb=1 open_gop=0 weightp=1 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0  rc_lookahead=20 rc=crf mbtree=1 crf=51.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 
Output #0, mp4, to  '/home/flirtzo/public_html/userfiles/files/b2/72/695f4eba95169a3f29564bf9571c703b05f1b5974f5156da633e b139c80a1575452e2858dfc61cc82bfca02d2b156aa64d4503695756481dc2a5d1c673a4cdea- 94e76a18a7838e62ecb23cf0c374b1b798e7b936.mp4': 
    Metadata: 
    encoder   : Lavf55.37.100 
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0]/0x0021), yuv420p, 320x218 [SAR 1199:1314  DAR 880:657], q=-1--1, 30k tbn, 29.97 tbc 
    Stream #0:1: Audio: aac ([64][0][0][0]/0x0040), 44100 Hz, stereo, fltp, 128 kb/s 
Stream mapping: 
    Stream #0:0 -> #0:0 (mpeg1video -> libx264) 
    Stream #0:1 -> #0:1 (mp2 -> aac) 
Press [q] to stop, [?] for help 
frame=16127 fps=786 q=-1.0 Lsize= 10559kB time=00:08:58.12 bitrate= 160.7kbits/s dup=12 drop=0 
video:1586kB audio:8410kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead:  5.638589% 
[libx264 @ 0x2b189c0] frame I:109 Avg QP:50.58 size: 494 
[libx264 @ 0x2b189c0] frame P:9537 Avg QP:51.00 size: 138 
[libx264 @ 0x2b189c0] frame B:6481 Avg QP:51.00 size: 40 
[libx264 @ 0x2b189c0] consecutive B-frames: 21.8% 72.1% 5.4% 0.7% 
[libx264 @ 0x2b189c0] mb I I16..4: 46.1% 53.9% 0.0% 
[libx264 @ 0x2b189c0] mb P I16..4: 6.0% 6.1% 0.0% P16..4: 12.7% 1.1% 0.1% 0.0% 0.0%  skip:74.1% 
[libx264 @ 0x2b189c0] mb B I16..4: 0.1% 0.1% 0.0% B16..8: 6.3% 0.0% 0.0% direct: 0.7%  skip:92.9% L0:38.6% L1:61.2% BI: 0.2% 
[libx264 @ 0x2b189c0] 8x8 transform intra:50.8% inter:85.6% 
[libx264 @ 0x2b189c0] coded y,uvDC,uvAC intra: 5.9% 39.5% 0.1% inter: 0.1% 1.0% 0.0% 
[libx264 @ 0x2b189c0] i16 v,h,dc,p: 56% 30% 7% 7% 
[libx264 @ 0x2b189c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 11% 62% 3% 3% 3% 3% 2% 2% 
[libx264 @ 0x2b189c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 5% 73% 2% 0% 0% 0% 0% 2% 
[libx264 @ 0x2b189c0] i8c dc,h,v,p: 97% 1% 2% 0% 
[libx264 @ 0x2b189c0] Weighted P-Frames: Y:5.5% UV:2.7% 
[libx264 @ 0x2b189c0] ref P L0: 64.8% 35.2% 
[libx264 @ 0x2b189c0] ref B L0: 75.2% 24.8% 
[libx264 @ 0x2b189c0] ref B L1: 99.3% 0.7% 
[libx264 @ 0x2b189c0] kb/s:24.13 
ffmpeg version git-2014-04-16-c150e2c Copyright (c) 2000-2014 the FFmpeg developers 
    built on Sep 28 2014 21:08:17 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-4) 
    configuration: --prefix=/root/ffmpeg_build --extra-cflags=-I/root/ffmpeg_build/include --extra- ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --extra-libs=-ldl --enable-gpl --enable-nonfree - -enable-libfdk_aac --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable- libx264 
    libavutil  52. 76.100/52. 76.100 
    libavcodec  55. 58.103/55. 58.103 
    libavformat 55. 37.100/55. 37.100 
    libavdevice 55. 13.100/55. 13.100 
    libavfilter  4. 4.100/4. 4.100 
    libswscale  2. 6.100/2. 6.100 
    libswresample 0. 18.100/0. 18.100 
    libpostproc 52. 3.100/52. 3.100 
Input #0, mpeg, from  '/home/flirtzo/public_html//userfiles/files/94e76a18a7838e62ecb23cf0c374b1b798e7b936': 
    Duration: 00:00:25.97, start: 0.340078, bitrate: 29004 kb/s 
    Stream #0:0[0x1e0]: Video: mpeg1video, yuv420p(tv), 352x240 [SAR 200:219 DAR 880:657], 1150   kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 29.97 tbc 
    Stream #0:1[0x1c0]: Audio: mp2, 44100 Hz, stereo, s16p, 224 kb/s 
[libx264 @ 0x300d9c0] using SAR=200/219 
[libx264 @ 0x300d9c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX 
[libx264 @ 0x300d9c0] profile High, level 2.2 
[libx264 @ 0x300d9c0] 264 - core 142 r2 d6b4e63 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 -      http://www.videolan.org/x264.html - options: cabac=1 ref=16 deblock=1:0:0 analyse=0x3:0x133 me=umh   subme=10 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=24 chroma_me=1 trellis=2 8x8dct=1 cqm=0  deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=1 sliced_threads=0 nr=0  decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=8 b_pyramid=2 b_adapt=2 b_bias=0  direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0  rc_lookahead=60 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 
Output #0, mp4, to  '/home/flirtzo/public_html/userfiles/files/b2/72/73d4a3245c0b0e174ab7ce0f872ba3f649f8b93f73a6deeab364 4a994009d73638ce61aecc7dc2e0250c4e74ff2d9a4d479ed35cef26b3f6e1a77e8bf5938518- 94e76a18a7838e62ecb23cf0c374b1b798e7b936.mp4': 
    Metadata: 
    encoder   : Lavf55.37.100 
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0]/0x0021), yuv420p, 352x240 [SAR 200:219  DAR 880:657], q=-1--1, 30k tbn, 29.97 tbc 
    Stream #0:1: Audio: aac ([64][0][0][0]/0x0040), 44100 Hz, stereo, fltp, 128 kb/s 
Stream mapping: 
    Stream #0:0 -> #0:0 (mpeg1video -> libx264) 
    Stream #0:1 -> #0:1 (mp2 -> aac) 
    Press [q] to stop, [?] for help 
frame=16127 fps= 88 q=-1.0 Lsize= 29190kB time=00:08:58.12 bitrate= 444.4kbits/s dup=12 drop=0 
video:20221kB audio:8410kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead:  1.954086% 
[libx264 @ 0x300d9c0] frame I:73 Avg QP:24.31 size: 8024 
[libx264 @ 0x300d9c0] frame P:4399 Avg QP:26.97 size: 2600 
[libx264 @ 0x300d9c0] frame B:11655 Avg QP:32.51 size: 745 
[libx264 @ 0x300d9c0] consecutive B-frames: 3.8% 5.0% 27.2% 18.4% 8.4% 33.9% 1.7% 0.7% 0.9% 
[libx264 @ 0x300d9c0] mb I I16..4: 10.8% 68.5% 20.7% 
[libx264 @ 0x300d9c0] mb P I16..4: 2.9% 7.5% 0.8% P16..4: 45.1% 18.4% 12.4% 0.5% 0.1%  skip:12.3% 
[libx264 @ 0x300d9c0] mb B I16..4: 0.6% 1.3% 0.1% B16..8: 40.1% 8.7% 1.7% direct: 2.1%  skip:45.5% L0:47.2% L1:41.7% BI:11.1% 
[libx264 @ 0x300d9c0] 8x8 transform intra:66.7% inter:76.7% 
[libx264 @ 0x300d9c0] direct mvs spatial:99.9% temporal:0.1% 
[libx264 @ 0x300d9c0] coded y,uvDC,uvAC intra: 60.3% 75.8% 16.4% inter: 17.3% 16.8% 0.6% 
[libx264 @ 0x300d9c0] i16 v,h,dc,p: 16% 27% 11% 47% 
[libx264 @ 0x300d9c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 13% 13% 18% 6% 9% 9% 11% 9% 11% 
[libx264 @ 0x300d9c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 13% 15% 7% 7% 14% 14% 13% 8% 10% 
[libx264 @ 0x300d9c0] i8c dc,h,v,p: 26% 32% 20% 22% 
[libx264 @ 0x300d9c0] Weighted P-Frames: Y:10.1% UV:6.9% 
[libx264 @ 0x300d9c0] ref P L0: 40.6% 12.1% 10.0% 5.2% 5.2% 4.7% 4.6% 3.0% 2.5% 2.1% 1.9%  1.8% 1.7% 1.7% 1.6% 1.3% 
[libx264 @ 0x300d9c0] ref B L0: 71.4% 5.6% 3.2% 3.0% 3.1% 2.8% 2.5% 1.8% 1.3% 1.0% 1.1%  1.2% 1.0% 0.7% 0.5% 
[libx264 @ 0x300d9c0] ref B L1: 96.3% 3.7% 
[libx264 @ 0x300d9c0] kb/s:307.82 

Answer 1

您需要添加-movflags +faststart選項。這會將moov原子重定位到文件的開頭;否則客戶端必須在開始播放之前下載整個文件。

具有ffmpeg版本但沒有此選項的用戶正在使用古老的東西，並應該參考FFmpeg Download頁面（您可以下載，提取並執行靜態構建版本）。