Tôi đang cố gắng chuyển mã video bằng ffmpeg. Sau đây là lệnh mẫu.
ffmpeg.exe -i 534.mp4 -vcodec libx264 -level 3.1 -b:v 396k -ar 48000 -ab 32k -s 100x100 -force_key_frames expr:gte(t,n_forced*2) -y -r 29.97 output.mp4
Điều này chơi tốt trong IE và Firefox nhưng không phải trên Chrome. Điều gì có thể là vấn đề? Làm cách nào để đặt các cài đặt trước khác nhau? Khi tôi đưa ra -vpre
, nó báo lỗi "Không tìm thấy tập tin cài sẵn".
Đây là đầu ra giao diện điều khiển:
ffmpeg version N-65738-g3c197442 Copyright (c) 2000-2014 the FFmpeg developers
built on Aug 18 2014 22:10:31 with gcc 4.8.3 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfi
g --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-lib
opencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinge
r --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --
enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-
libx265 --enable-libxavs --enable-libxvid --enable-decklink --enable-zlib
libavutil 54. 5.100 / 54. 5.100
libavcodec 56. 0.101 / 56. 0.101
libavformat 56. 1.100 / 56. 1.100
libavdevice 56. 0.100 / 56. 0.100
libavfilter 5. 0.100 / 5. 0.100
libswscale 3. 0.100 / 3. 0.100
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 0.100 / 53. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '534.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isom
creation_time : 2014-09-26 19:08:24
Duration: 00:02:04.33, start: 0.000000, bitrate: 107 kb/s
Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv), 192x128 [SAR 1:1 DAR 3:2], 75 kb/s, 12.50
fps, 12.50 tbr, 12500 tbn, 25 tbc (default)
Metadata:
creation_time : 2014-09-26 19:08:24
handler_name : MP4 Video Media Handler
encoder : AVC Coding
Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 30 kb/s (default)
Metadata:
creation_time : 2014-09-26 19:08:24
handler_name : MP4 Sound Media Handler
[libx264 @ 0000000002ac5920] using SAR=3/2
[libx264 @ 0000000002ac5920] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0000000002ac5920] profile High, level 3.1
[libx264 @ 0000000002ac5920] 264 - core 142 r2453 ea0ca51 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.vid
eolan.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=6 lookah
ead_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=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahe
ad=40 rc=abr mbtree=1 bitrate=396 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'output.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isom
encoder : Lavf56.1.100
Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 100x100 [SAR 3:2 DAR 3:2], q=-1--1, 396 k
b/s, 29.97 fps, 11988 tbn, 29.97 tbc (default)
Metadata:
creation_time : 2014-09-26 19:08:24
handler_name : MP4 Video Media Handler
encoder : Lavc56.0.101 libx264
Stream #0:1(eng): Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, s16, 32 kb/s (default)
Metadata:
creation_time : 2014-09-26 19:08:24
handler_name : MP4 Sound Media Handler
encoder : Lavc56.0.101 libvo_aacenc
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (aac (native) -> aac (libvo_aacenc))
Press [q] to stop, [?] for help
frame= 3722 fps=847 q=-1.0 Lsize= 5702kB time=00:02:04.34 bitrate= 375.7kbits/s dup=2169 drop=0
video:5083kB audio:487kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.378099%
[libx264 @ 0000000002ac5920] frame I:71 Avg QP: 0.46 size: 6755
[libx264 @ 0000000002ac5920] frame P:1542 Avg QP: 0.52 size: 2867
[libx264 @ 0000000002ac5920] frame B:2109 Avg QP: 3.55 size: 144
[libx264 @ 0000000002ac5920] consecutive B-frames: 14.2% 28.2% 7.7% 50.0%
[libx264 @ 0000000002ac5920] mb I I16..4: 25.2% 5.1% 69.7%
[libx264 @ 0000000002ac5920] mb P I16..4: 2.1% 0.5% 4.6% P16..4: 26.3% 12.5% 11.2% 0.0% 0.0% skip:42.8%
[libx264 @ 0000000002ac5920] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 10.9% 1.1% 0.6% direct: 1.9% skip:85.5% L0:41
.7% L1:51.9% BI: 6.5%
[libx264 @ 0000000002ac5920] final ratefactor: -7.35
[libx264 @ 0000000002ac5920] 8x8 transform intra:6.1% inter:21.2%
[libx264 @ 0000000002ac5920] coded y,uvDC,uvAC intra: 65.5% 80.0% 79.4% inter: 18.5% 21.3% 21.2%
[libx264 @ 0000000002ac5920] i16 v,h,dc,p: 44% 50% 4% 1%
[libx264 @ 0000000002ac5920] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 39% 16% 3% 2% 3% 3% 4% 5%
[libx264 @ 0000000002ac5920] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 14% 51% 10% 3% 4% 4% 4% 4% 6%
[libx264 @ 0000000002ac5920] i8c dc,h,v,p: 27% 54% 15% 4%
[libx264 @ 0000000002ac5920] Weighted P-Frames: Y:4.9% UV:2.4%
[libx264 @ 0000000002ac5920] ref P L0: 78.8% 10.4% 6.6% 4.0% 0.2%
[libx264 @ 0000000002ac5920] ref B L0: 96.9% 2.4% 0.7%
[libx264 @ 0000000002ac5920] ref B L1: 99.8% 0.2%
[libx264 @ 0000000002ac5920] kb/s:335.24