Eu tenho um vídeo 720x480 (3: 2) que gostaria de alterar para 720x406 (16: 9) para corresponder aos outros vídeos que tenho para um site. Eu tentei várias combinações de comandos, incluindo:
ffmpeg -i myfile.mv4 -s 720x406 outfile.mp4
ffmpeg -9 myfile.m4v -c copy -aspect 16:9 outfile.mp4
O que eu acabo com um vídeo que reduziu para a altura especificada, mas não preservou a largura. Ele acaba em 608x406 ou por aí. Eu tenho jogado com várias versões de GUI do ffmpeg hoje, e eles parecem fazer a mesma coisa.
Quais seriam as opções / parâmetros apropriados para passar (supondo que terei mais controle através da linha de comando) para obter o tamanho de quadro desejado?
O comando e a saída completa do console:
$ ffmpeg -i Animation.m4v -s 720x406 Animation.mp4
ffmpeg version 2.1.2-tessus Copyright (c) 2000-2013 the FFmpeg developers
built on Jan 13 2014 18:27:44 with llvm-gcc 4.2.1 (LLVM build 2336.1.00)
configuration: --prefix=/Users/tessus/data/ext/ffmpeg/sw --as=yasm --extra-version=tessus --disable-shared --enable-static --disable-ffplay --enable-gpl --enable-pthreads --enable-postproc --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-libspeex --enable-bzlib --enable-zlib --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libxavs --enable-version3 --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvpx --enable-libgsm --enable-libopus --enable-fontconfig --enable-libfreetype --enable-libass --enable-libbluray --enable-filters --enable-runtime-cpudetect
libavutil 52. 48.101 / 52. 48.101
libavcodec 55. 39.101 / 55. 39.101
libavformat 55. 19.104 / 55. 19.104
libavdevice 55. 5.100 / 55. 5.100
libavfilter 3. 90.100 / 3. 90.100
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 17.104 / 0. 17.104
libpostproc 52. 3.100 / 52. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Animation.m4v':
Metadata:
major_brand : M4VH
minor_version : 1
compatible_brands: M4VHM4V M4A mp42isom
creation_time : 2013-10-10 22:54:24
encoder : Mac OS X v10.7.5 (CMA 891, CM 705.94, x86_64)
Duration: 00:00:33.75, start: 0.000000, bitrate: 1928 kb/s
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 720x480 [SAR 1:1 DAR 3:2], 1924 kb/s, 30 fps, 30 tbr, 60k tbn, 120k tbc (default)
Metadata:
creation_time : 2013-10-10 22:54:24
handler_name : Core Media Video
File 'Animation.mp4' already exists. Overwrite ? [y/N] y
[libx264 @ 0x102030a00] using SAR=203/240
[libx264 @ 0x102030a00] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64 SlowShuffle
[libx264 @ 0x102030a00] profile High, level 3.0
[libx264 @ 0x102030a00] 264 - core 138 r481 3a1e20c - 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 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 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 'Animation.mp4':
Metadata:
major_brand : M4VH
minor_version : 1
compatible_brands: M4VHM4V M4A mp42isom
encoder : Lavf55.19.104
Stream #0:0(und): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 720x406 [SAR 203:240 DAR 3:2], q=-1--1, 15360 tbn, 30 tbc (default)
Metadata:
creation_time : 2013-10-10 22:54:24
handler_name : Core Media Video
Stream mapping:
Stream #0:0 -> #0:0 (h264 -> libx264)
Press [q] to stop, [?] for help
frame= 1013 fps=214 q=-1.0 Lsize= 1334kB time=00:00:33.70 bitrate= 324.4kbits/s
video:1322kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.908640%
[libx264 @ 0x102030a00] frame I:5 Avg QP:13.16 size: 19296
[libx264 @ 0x102030a00] frame P:375 Avg QP:19.62 size: 2729
[libx264 @ 0x102030a00] frame B:633 Avg QP:24.13 size: 369
[libx264 @ 0x102030a00] consecutive B-frames: 13.7% 6.9% 5.9% 73.4%
[libx264 @ 0x102030a00] mb I I16..4: 46.0% 31.9% 22.1%
[libx264 @ 0x102030a00] mb P I16..4: 1.2% 2.3% 0.7% P16..4: 16.4% 6.8% 3.5% 0.0% 0.0% skip:68.9%
[libx264 @ 0x102030a00] mb B I16..4: 0.1% 0.1% 0.0% B16..8: 11.6% 0.9% 0.2% direct: 0.4% skip:86.7% L0:33.8% L1:61.2% BI: 5.0%
[libx264 @ 0x102030a00] 8x8 transform intra:47.9% inter:64.9%
[libx264 @ 0x102030a00] coded y,uvDC,uvAC intra: 37.8% 40.9% 17.6% inter: 4.9% 4.8% 0.9%
[libx264 @ 0x102030a00] i16 v,h,dc,p: 48% 34% 7% 11%
[libx264 @ 0x102030a00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 30% 24% 27% 2% 2% 3% 4% 4% 3%
[libx264 @ 0x102030a00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 33% 24% 16% 4% 4% 5% 6% 4% 4%
[libx264 @ 0x102030a00] i8c dc,h,v,p: 61% 21% 15% 2%
[libx264 @ 0x102030a00] Weighted P-Frames: Y:12.0% UV:7.7%
[libx264 @ 0x102030a00] ref P L0: 72.4% 14.3% 9.8% 3.4% 0.1%
[libx264 @ 0x102030a00] ref B L0: 88.2% 10.1% 1.7%
[libx264 @ 0x102030a00] ref B L1: 94.4% 5.6%
[libx264 @ 0x102030a00] kb/s:320.67
A resposta a esta pergunta encontra-se no Video Stack Stack Exchange:
Como eu altero o tamanho do quadro, preservando a largura (usando ffmpeg)?
Use um filtro setdar para definir a proporção da apresentação (proporção da apresentação):
-vf scale=720x406,setdar=16:9