Saya sedang membangun aplikasi NodeJS yang mengubah videofile statis menjadi video streaming yang sedang dikirim ke klien (iPad atau browser) dengan cepat (menggunakan modul fluent-ffmpeg).
Semuanya sudah diatur dan yang saya butuhkan sekarang adalah mengkonfigurasi ffmpeg dengan benar. Tapi saya punya banyak masalah dengan ffmpeg. Pada awalnya saya membangun aliran flash (flv dengan lib264 codec yang bekerja sangat baik, tetapi tentu saja tidak bekerja di iPad).
Dengan pengaturan saya saat ini, saya segera mendengar audio, tetapi gambar mulai beberapa detik kemudian. Kemudian, file uji 30 detik saya telah dikompresi hingga 3 detik dari pencitraan kecepatan tinggi.
Bagaimana saya bisa mengkonfigurasi ffmpeg saya sehingga akan melakukan streaming mp4 dengan benar (tentu saja dalam sekali lewat). Sepertinya ini streaming h264 mentah, jika itu masalahnya bagaimana saya bisa memaksa wadah mp4. Saya pikir saya melakukan itu dengan menggunakan '-f mp4'
pengaturan saya yang benar adalah:
'-crf 22','-c:v libx264','-f mp4','-movflags','faststart+frag_keyframe'
Saya juga sudah mencoba:
'-r 30','-crf 30','-analyzeduration 0','-probesize 1000','-rc_lookahead 0','-fflags nobuffer','-g 75','-ss 0','-threads 0','-vcodec libx264','-qcomp 0.6','-qmin 10','-qmax 51','-qdiff 4','-b:v 400k','-maxrate 400k','-bufsize 800k','-acodec mp3','-ab 192k','-ar 44100','-tune zerolatency','-f mp4','-movflags','faststart+frag_keyframe'
Seperti yang Anda lihat dari jumlah opsi yang saya coba, saya menjadi sangat putus asa. Saya pada dasarnya hanya berlarian dalam gelap.
Saya tidak berpikir itu penting tetapi ini adalah header permintaan saya:
res.writeHead(200, {
'Content-Type':'video/mp4',
'Content-Length':stat.size,
'Content-Range':'bytes '+start+'-'+end+'/'+stat.size,
'Transfer-Encoding':'chunked'
});
Log FFmpeg:
file conversion error ffmpeg version N-52458-gaa96439 Copyright (c) 2000-2013 the FFmpeg developers
built on Apr 24 2013 22:19:32 with gcc 4.8.0 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable
-libgsm --enable-libilbc --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwola
me --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
libavutil 52. 27.101 / 52. 27.101
libavcodec 55. 6.100 / 55. 6.100
libavformat 55. 3.100 / 55. 3.100
libavdevice 55. 0.100 / 55. 0.100
libavfilter 3. 60.101 / 3. 60.101
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 3.100 / 52. 3.100
Input #0, avi, from 'C:/temp/avatar.avi':
Metadata:
encoder : Nandub v1.0rc2
Duration: 00:01:09.78, start: 0.000000, bitrate: 1517 kb/s
Stream #0:0: Video: msmpeg4v3 (DIV3 / 0x33564944), yuv420p, 640x352, 23.98 tbr, 23.98 tbn, 23.98 tbc
Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 222 kb/s
[libx264 @ 0218d480] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0218d480] profile High, level 3.0
[libx264 @ 0218d480] 264 - core 130 r2274 c832fe9 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16
chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 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 w
eightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=23 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=22.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'pipe:1':
Metadata:
encoder : Lavf55.3.100
Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 640x352, q=-1--1, 11988 tbn, 23.98 tbc
Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, s16, 128 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (msmpeg4 -> libx264)
Stream #0:1 -> #0:1 (mp3 -> libvo_aacenc)
Press [q] to stop, [?] for help
frame= 103 fps=0.0 q=27.0 size= 0kB time=00:00:04.70 bitrate= 0.1kbits/s
frame= 162 fps=161 q=27.0 size= 278kB time=00:00:07.15 bitrate= 317.9kbits/s
frame= 214 fps=141 q=27.0 size= 463kB time=00:00:09.33 bitrate= 406.3kbits/s
frame= 277 fps=137 q=27.0 size= 673kB time=00:00:11.95 bitrate= 461.3kbits/s
frame= 334 fps=132 q=27.0 size= 826kB time=00:00:14.32 bitrate= 472.5kbits/s
frame= 386 fps=127 q=27.0 size= 1061kB time=00:00:16.52 bitrate= 526.2kbits/s
frame= 428 fps=120 q=27.0 size= 1061kB time=00:00:18.27 bitrate= 475.9kbits/s
frame= 472 fps=116 q=27.0 size= 1061kB time=00:00:20.08 bitrate= 432.9kbits/s
frame= 525 fps=115 q=27.0 size= 1562kB time=00:00:22.30 bitrate= 573.7kbits/s
frame= 589 fps=116 q=27.0 size= 1804kB time=00:00:24.99 bitrate= 591.4kbits/s
frame= 690 fps=124 q=27.0 size= 1804kB time=00:00:29.19 bitrate= 506.2kbits/s
frame= 827 fps=136 q=27.0 size= 2191kB time=00:00:34.91 bitrate= 514.1kbits/s
frame= 921 fps=140 q=27.0 size= 2540kB time=00:00:38.81 bitrate= 536.1kbits/s
frame= 1015 fps=143 q=27.0 size= 2540kB time=00:00:42.74 bitrate= 486.9kbits/s
frame= 1124 fps=148 q=27.0 size= 3531kB time=00:00:47.30 bitrate= 611.5kbits/s
frame= 1248 fps=154 q=27.0 size= 3727kB time=00:00:52.46 bitrate= 581.9kbits/s
frame= 1371 fps=160 q=27.0 size= 4251kB time=00:00:57.58 bitrate= 604.7kbits/s
frame= 1516 fps=167 q=27.0 size= 4684kB time=00:01:03.62 bitrate= 603.0kbits/s
frame= 1632 fps=170 q=27.0 size= 4932kB time=00:01:08.46 bitrate= 590.1kbits/s
frame= 1673 fps=167 q=2686559.0 Lsize= 5507kB time=00:01:09.76 bitrate= 646.6kbits/s
video:4385kB audio:1091kB subtitle:0 global headers:0kB muxing overhead 0.582195%
[libx264 @ 0218d480] frame I:17 Avg QP:18.90 size: 11501
[libx264 @ 0218d480] frame P:1467 Avg QP:21.41 size: 2825
[libx264 @ 0218d480] frame B:189 Avg QP:24.42 size: 788
[libx264 @ 0218d480] consecutive B-frames: 84.5% 1.0% 1.4% 13.2%
[libx264 @ 0218d480] mb I I16..4: 21.5% 75.6% 2.9%
[libx264 @ 0218d480] mb P I16..4: 1.0% 2.8% 0.2% P16..4: 39.6% 13.7% 8.2% 0.0% 0.0% skip:34.6%
[libx264 @ 0218d480] mb B I16..4: 0.1% 0.3% 0.1% B16..8: 37.3% 2.6% 0.4% direct: 0.8% skip:58.4% L0:44.0% L1:51.7% BI: 4.3%
[libx264 @ 0218d480] 8x8 transform intra:70.8% inter:82.9%
[libx264 @ 0218d480] coded y,uvDC,uvAC intra: 58.7% 53.9% 12.8% inter: 20.2% 19.7% 0.4%
[libx264 @ 0218d480] i16 v,h,dc,p: 62% 16% 9% 13%
[libx264 @ 0218d480] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 14% 30% 3% 5% 6% 4% 5% 4%
[libx264 @ 0218d480] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 34% 13% 11% 4% 10% 11% 7% 6% 3%
[libx264 @ 0218d480] i8c dc,h,v,p: 44% 19% 33% 4%
[libx264 @ 0218d480] Weighted P-Frames: Y:0.1% UV:0.0%
[libx264 @ 0218d480] ref P L0: 69.0% 16.7% 10.2% 4.0% 0.0%
[libx264 @ 0218d480] ref B L0: 86.1% 10.0% 3.9%
[libx264 @ 0218d480] ref B L1: 92.9% 7.1%
[libx264 @ 0218d480] kb/s:514.67
Perintah nodejs persis saya dengan kasus uji yang saya gunakan (yang dikomentari):
, proc = new ffmpeg({
source: movie,
nolog: true,
timeout:15000
})
.addOptions(['-crf 22','-c:v libx264','-f mp4','-movflags','faststart+frag_keyframe'])
//.addOptions(['-threads 0', '-i_qfactor 0.71', '-qcomp 0.6', '-qmin 10', '-qmax 63', '-qdiff 4', '-trellis 0', '-vcodec libx264', '-s 640x360', '-b:v 1000k', '-b:a 56k','-ar 22050','-f mp4','-movflags','faststart+frag_keyframe'])
//.addOptions(['-r 30','-crf 30','-analyzeduration 0','-probesize 1000','-rc_lookahead 0','-fflags nobuffer','-g 75','-ss 0','-threads 0','-vcodec libx264','-qcomp 0.6','-qmin 10','-qmax 51','-qdiff 4','-b:v 400k','-maxrate 400k','-bufsize 800k','-acodec mp3','-ab 192k','-ar 44100','-tune zerolatency',metaDuration,tDuration,'-f mp4','-movflags','faststart+frag_keyframe'])
.writeToStream(res, function(retcode, error){
if (!error){
console.log('file has been converted succesfully',retcode .green);
}else{
console.log('file conversion error',error .red);
}
});
Pemain frontend saya adalah pemain HTML5 dasar dengan videoJS di atas (untuk tema dan kemampuan kontrol).
<video id="player" class="video-js vjs-default-skin" controls preload="both" width="100%" height="100%"><source src="'+url+'" type="video/mp4"></video>