Eu tenho problemas com a transcodificação de alguns vídeos. Eu corri o comando ffmpeg mais simples e demorou muito tempo eo arquivo de saída é cerca de 10 vezes maior. Se eu fornecer o parâmetro taxa de quadros -r, ele funciona bem (arquivo pequeno, transcodificação rápida). Qual é o problema e como posso resolvê-lo? Não quero definir uma taxa fixa de quadros porque acho melhor deixá-la igual à fonte, não é?
Talvez o problema seja outra coisa, porque eu encontrei muitos exemplos na web onde a opção -r não é usada. Também a transcodificação para um formato diferente ou com uma fonte diferente funciona bem sem a opção -r (tentei com o ffmpeg 0.7.13 e 1.2.1 no mac os (fornecido pelas portas mac) e 0.7.15 em um servidor linux debian). Os vídeos são fornecidos pelos usuários do meu site e convertidos automaticamente para serem adequados para a web. Então eu preciso do comando mais geral para conversão automática.
Na seguinte saída do ffmpeg, você encontrará estas duas mensagens suspeitas:
- Taxa de quadros muito alta para um muxer que não a suporta eficientemente. Por favor, considere especificar uma taxa de quadros inferior, um muxer diferente ou -vsync 2
- Taxa de MB (36000000) > limite de nível (983040)
O comando ffmpeg e a saída (sem a opção -r):
ffmpeg -i '/tmp/standort_aquarium.mp4' -vcodec libx264 output.mp4
ffmpeg version 0.7.15, Copyright (c) 2000-2013 the FFmpeg developers built on Feb 22 2013 07:18:58 with gcc 4.4.5 configuration: --enable-libdc1394 --prefix=/usr --extra-cflags='-Wall -g ' --cc='ccache cc' --enable-shared --enable-libmp3lame --enable-gpl --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm --enable-libtheora --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libspeex --enable-nonfree --disable-stripping --enable-avfilter --enable-libdirac --disable-decoder=libdirac --enable-libfreetype --enable-libschroedinger --disable-encoder=libschroedinger --enable-version3 --enable-libopenjpeg --enable-libvpx --enable-librtmp --extra-libs=-lgcrypt --disable-altivec --disable-armv5te --disable-armv6 --disable-vis
libavutil 50. 43. 0 / 50. 43. 0
libavcodec 52.123. 0 / 52.123. 0
libavformat 52.111. 0 / 52.111. 0
libavdevice 52. 5. 0 / 52. 5. 0
libavfilter 1. 80. 0 / 1. 80. 0
libswscale 0. 14. 1 / 0. 14. 1
libpostproc 51. 2. 0 / 51. 2. 0
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/tmp/standort_aquarium.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp423gp4isom
creation_time : 2013-04-19 15:04:05
Duration: 00:00:18.24, start: 0.000000, bitrate: 2095 kb/s
Stream #0.0(und): Video: mpeg4, yuv420p, 640x480 [PAR 1:1 DAR 4:3], 2001 kb/s, 14.97 fps, 30k tbr, 30k tbn, 30k tbc
Metadata:
creation_time : 2013-04-19 15:04:05
Stream #0.1(und): Audio: aac, 48000 Hz, mono, s16, 96 kb/s
Metadata:
creation_time : 2013-04-19 15:04:05
File 'output.mp4' already exists. Overwrite ? [y/N] y
[mp4 @ 0x20eed80] Frame rate very high for a muxer not effciciently supporting it.
Please consider specifiying a lower framerate, a different muxer or -vsync 2
[buffer @ 0x20f8820] w:640 h:480 pixfmt:yuv420p tb:1/1000000 sar:1/1 sws_param:
[libx264 @ 0x20efde0] Default settings detected, using medium profile
[libx264 @ 0x20efde0] using SAR=1/1
[libx264 @ 0x20efde0] MB rate (36000000) > level limit (983040)
[libx264 @ 0x20efde0] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
[libx264 @ 0x20efde0] profile High, level 5.1
[libx264 @ 0x20efde0] 264 - core 118 - 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=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=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_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 'output.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp423gp4isom
creation_time : 2013-04-19 15:04:05
encoder : Lavf52.111.0
Stream #0.0(und): Video: libx264, yuv420p, 640x480 [PAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 30k tbn, 30k tbc
Metadata:
creation_time : 2013-04-19 15:04:05
Stream #0.1(und): Audio: libfaac, 48000 Hz, mono, s16, 64 kb/s
Metadata:
creation_time : 2013-04-19 15:04:05
Stream mapping:
Stream #0.0 -> #0.0
Stream #0.1 -> #0.1
Press [q] to stop, [?] for help
frame=542630 fps=132 q=33.0 Lsize= 77226kB time=00:00:18.08 bitrate=34976.2kbits/s dup=542358 drop=0
video:68604kB audio:143kB global headers:0kB muxing overhead 12.333275%
frame I:2174 Avg QP:18.72 size: 25040
[libx264 @ 0x20efde0] frame P:136846 Avg QP:25.27 size: 56
[libx264 @ 0x20efde0] frame B:403610 Avg QP:32.99 size: 20
[libx264 @ 0x20efde0] consecutive B-frames: 0.8% 0.0% 0.1% 99.1%
[libx264 @ 0x20efde0] mb I I16..4: 5.5% 83.3% 11.1%
[libx264 @ 0x20efde0] mb P I16..4: 0.0% 0.0% 0.0% P16..4: 0.5% 0.0% 0.0% 0.0% 0.0% skip:99.4%
[libx264 @ 0x20efde0] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 0.0% 0.0% 0.0% direct: 0.0% skip:100.0% L0:21.2% L1:78.8% BI: 0.0%
[libx264 @ 0x20efde0] 8x8 transform intra:83.1% inter:85.2%
[libx264 @ 0x20efde0] coded y,uvDC,uvAC intra: 91.2% 95.8% 80.7% inter: 0.0% 0.1% 0.0%
[libx264 @ 0x20efde0] i16 v,h,dc,p: 13% 40% 12% 35%
[libx264 @ 0x20efde0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 34% 15% 4% 4% 5% 6% 7% 8%
[libx264 @ 0x20efde0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 38% 6% 4% 6% 6% 8% 6% 6%
[libx264 @ 0x20efde0] i8c dc,h,v,p: 39% 32% 19% 10%
[libx264 @ 0x20efde0] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x20efde0] ref P L0: 91.5% 5.2% 2.8% 0.4% 0.0%
[libx264 @ 0x20efde0] ref B L0: 55.7% 43.5% 0.8%
[libx264 @ 0x20efde0] ref B L1: 97.9% 2.1%
[libx264 @ 0x20efde0] kb/s:31071.04
O comando ffmpeg e a saída com a opção -r 24:
ffmpeg -i '/tmp/standort_aquarium.mp4' -r 30000/1001 -vcodec libx264 output.mp4
ffmpeg version 0.7.15, Copyright (c) 2000-2013 the FFmpeg developers
built on Feb 22 2013 07:18:58 with gcc 4.4.5
configuration: --enable-libdc1394 --prefix=/usr --extra-cflags='-Wall -g ' --cc='ccache cc' --enable-shared --enable-libmp3lame --enable-gpl --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm --enable-libtheora --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libspeex --enable-nonfree --disable-stripping --enable-avfilter --enable-libdirac --disable-decoder=libdirac --enable-libfreetype --enable-libschroedinger --disable-encoder=libschroedinger --enable-version3 --enable-libopenjpeg --enable-libvpx --enable-librtmp --extra-libs=-lgcrypt --disable-altivec --disable-armv5te --disable-armv6 --disable-vis
libavutil 50. 43. 0 / 50. 43. 0
libavcodec 52.123. 0 / 52.123. 0
libavformat 52.111. 0 / 52.111. 0
libavdevice 52. 5. 0 / 52. 5. 0
libavfilter 1. 80. 0 / 1. 80. 0
libswscale 0. 14. 1 / 0. 14. 1
libpostproc 51. 2. 0 / 51. 2. 0
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/tmp/standort_aquarium.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp423gp4isom
creation_time : 2013-04-19 15:04:05
Duration: 00:00:18.24, start: 0.000000, bitrate: 2095 kb/s
Stream #0.0(und): Video: mpeg4, yuv420p, 640x480 [PAR 1:1 DAR 4:3], 2001 kb/s, 14.97 fps, 30k tbr, 30k tbn, 30k tbc
Metadata:
creation_time : 2013-04-19 15:04:05
Stream #0.1(und): Audio: aac, 48000 Hz, mono, s16, 96 kb/s
Metadata:
creation_time : 2013-04-19 15:04:05
File 'output.mp4' already exists. Overwrite ? [y/N] y
[buffer @ 0x132e820] w:640 h:480 pixfmt:yuv420p tb:1/1000000 sar:1/1 sws_param:
[libx264 @ 0x1325de0] Default settings detected, using medium profile
[libx264 @ 0x1325de0] using SAR=1/1
[libx264 @ 0x1325de0] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
[libx264 @ 0x1325de0] profile High, level 3.0
[libx264 @ 0x1325de0] 264 - core 118 - 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=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=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_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 'output.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp423gp4isom
creation_time : 2013-04-19 15:04:05
encoder : Lavf52.111.0
Stream #0.0(und): Video: libx264, yuv420p, 640x480 [PAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 30k tbn, 29.97 tbc
Metadata:
creation_time : 2013-04-19 15:04:05
Stream #0.1(und): Audio: libfaac, 48000 Hz, mono, s16, 64 kb/s
Metadata:
creation_time : 2013-04-19 15:04:05
Stream mapping:
Stream #0.0 -> #0.0
Stream #0.1 -> #0.1
Press [q] to stop, [?] for help
frame= 542 fps= 36 q=29.0 Lsize= 2059kB time=00:00:18.01 bitrate= 936.3kbits/s dup=270 drop=0
video:1904kB audio:143kB global headers:0kB muxing overhead 0.609224%
frame I:3 Avg QP:22.39 size: 14773
[libx264 @ 0x1325de0] frame P:514 Avg QP:23.98 size: 3675
[libx264 @ 0x1325de0] frame B:25 Avg QP:27.44 size: 643
[libx264 @ 0x1325de0] consecutive B-frames: 93.7% 0.0% 1.1% 5.2%
[libx264 @ 0x1325de0] mb I I16..4: 16.4% 78.3% 5.3%
[libx264 @ 0x1325de0] mb P I16..4: 1.6% 6.3% 0.3% P16..4: 30.8% 8.6% 3.1% 0.0% 0.0% skip:49.4%
[libx264 @ 0x1325de0] mb B I16..4: 0.4% 0.7% 0.0% B16..8: 13.2% 1.6% 0.2% direct: 0.3% skip:83.6% L0:50.0% L1:47.1% BI: 2.9%
[libx264 @ 0x1325de0] 8x8 transform intra:77.1% inter:83.1%
[libx264 @ 0x1325de0] coded y,uvDC,uvAC intra: 62.0% 76.4% 24.4% inter: 17.9% 26.3% 2.3%
[libx264 @ 0x1325de0] i16 v,h,dc,p: 14% 60% 13% 13%
[libx264 @ 0x1325de0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 35% 33% 2% 3% 3% 3% 3% 4%
[libx264 @ 0x1325de0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 40% 12% 4% 7% 7% 7% 5% 4%
[libx264 @ 0x1325de0] i8c dc,h,v,p: 46% 34% 16% 4%
[libx264 @ 0x1325de0] Weighted P-Frames: Y:8.0% UV:4.5%
[libx264 @ 0x1325de0] ref P L0: 65.6% 16.7% 8.8% 7.9% 0.9%
[libx264 @ 0x1325de0] ref B L0: 85.9% 13.3% 0.8%
[libx264 @ 0x1325de0] ref B L1: 88.7% 11.3%
[libx264 @ 0x1325de0] kb/s:862.28
A fonte de vídeo está temporariamente disponível em: link