Estou tentando usar o ffmpeg para combinar vários arquivos de vídeo em diferentes horários de início usando o filtro de sobreposição.
Quando faço isso sem nenhum áudio, o resultado gerado está correto.
Quando adiciono elementos de filtro de áudio com o amix para incluir o áudio dos vários vídeos sobrepostos, o ffmpeg começa a emitir erros desse tipo:
[Parsed_overlay_4 @ 0x305ec40] [framesync @ 0x305ed68] Buffer queue overflow, dropping.
Qualquer ajuda para evitar isso, ou formas alternativas de:
- Combinando vários clipes de vídeos
- Definir o horário de início de cada videoclipe
- Ter o áudio de cada clipe reproduzido em sincronia com o vídeo correspondente
seria muito apreciado.
Eu já tentei muitas combinações de setpts / asetpts / amerge / pan e não consigo trabalhar.
Aqui está minha linha de comando ffmpeg e a saída para o caso que causa um erro (a cláusula if na sobreposição y = faz com que os clipes sobrepostos percorram o vídeo enquanto eles são reproduzidos):
ffmpeg -y \
-i /wintmp/vid/butterfly_base.mp4 \
-i /wintmp/vid/party_overlay.mp4 \
-i /wintmp/vid/car_overlay.mp4 \
-pix_fmt yuv420p -r 30000/1001 -filter_complex " [1:v] setpts=PTS-STARTPTS+2/TB [v1] ; [0:v] [v1] overlay=x=50:y='if( gte(t,2), H-(t-2)*128, NAN)' [o1] ; [2:v] setpts=PTS-STARTPTS+3/TB,scale=width=320:height=240 [v2] ; [o1] [v2] overlay=x=100:y='if( gte(t,3), H-(t-3)*102.4, NAN)' [outv] ; [1:a] adelay=2000|2000 [a1] ; [2:a] adelay=3000|3000 [a2] ; [0:a] [a1] [a2] amix=inputs=3:duration=longest [outa] " -map "[outv]" -map "[outa]" /wintmp/vid/combined.mp4
ffmpeg version N-81978-g03d6d5f Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
configuration: --enable-gpl --enable-libx264 --enable-nonfree --enable-libfdk-aac
libavutil 55. 32.100 / 55. 32.100
libavcodec 57. 61.102 / 57. 61.102
libavformat 57. 51.107 / 57. 51.107
libavdevice 57. 0.102 / 57. 0.102
libavfilter 6. 63.100 / 6. 63.100
libswscale 4. 1.100 / 4. 1.100
libswresample 2. 2.100 / 2. 2.100
libpostproc 54. 0.100 / 54. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/wintmp/vid/butterfly_base.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf55.48.100
Duration: 00:00:08.01, start: 0.000000, bitrate: 550 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 480x272 [SAR 1:1 DAR 30:17], 412 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
Metadata:
handler_name : SoundHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/wintmp/vid/party_overlay.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
title : Teenage Fun, 1949 Style - http://www.archive.org/details/CEP503
date : 1949
encoder : Lavf55.48.100
comment : license: http://creativecommons.org/licenses/publicdomain/
Duration: 00:00:04.02, start: 0.000000, bitrate: 587 kb/s
Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 476 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 101 kb/s (default)
Metadata:
handler_name : SoundHandler
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from '/wintmp/vid/car_overlay.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf55.48.100
Duration: 00:00:05.09, start: 0.000000, bitrate: 951 kb/s
Stream #2:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 94 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream #2:1(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 854 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
Metadata:
handler_name : VideoHandler
[libx264 @ 0x3066780] using SAR=1/1
[libx264 @ 0x3066780] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
[libx264 @ 0x3066780] profile High, level 2.1
[libx264 @ 0x3066780] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - 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 '/wintmp/vid/combined.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.51.107
Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 480x272 [SAR 1:1 DAR 30:17], q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc (default)
Metadata:
encoder : Lavc57.61.102 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, fltp, 128 kb/s (default)
Metadata:
encoder : Lavc57.61.102 aac
Stream mapping:
Stream #0:0 (h264) -> overlay:main
Stream #0:1 (aac) -> amix:input0
Stream #1:0 (h264) -> setpts
Stream #1:1 (aac) -> adelay
Stream #2:0 (aac) -> adelay
Stream #2:1 (h264) -> setpts
overlay -> Stream #0:0 (libx264)
amix -> Stream #0:1 (aac)
Press [q] to stop, [?] for help
[Parsed_overlay_4 @ 0x305ec40] [framesync @ 0x305ed68] Buffer queue overflow, dropping.
Last message repeated 15 times
frame= 241 fps=0.0 q=-1.0 Lsize= 608kB time=00:00:08.10 bitrate= 614.6kbits/s speed=9.07x
video:472kB audio:126kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.638017%
[libx264 @ 0x3066780] frame I:1 Avg QP:24.29 size: 24368
[libx264 @ 0x3066780] frame P:117 Avg QP:24.94 size: 3290
[libx264 @ 0x3066780] frame B:123 Avg QP:31.72 size: 599
[libx264 @ 0x3066780] consecutive B-frames: 6.2% 72.2% 14.9% 6.6%
[libx264 @ 0x3066780] mb I I16..4: 0.0% 39.4% 60.6%
[libx264 @ 0x3066780] mb P I16..4: 0.1% 1.4% 1.1% P16..4: 32.1% 19.9% 14.0% 0.0% 0.0% skip:31.4%
[libx264 @ 0x3066780] mb B I16..4: 0.0% 0.3% 0.2% B16..8: 27.4% 4.9% 1.2% direct: 1.3% skip:64.7% L0:35.2% L1:57.1% BI: 7.8%
[libx264 @ 0x3066780] 8x8 transform intra:52.0% inter:52.6%
[libx264 @ 0x3066780] coded y,uvDC,uvAC intra: 89.9% 91.2% 74.9% inter: 15.6% 15.7% 3.1%
[libx264 @ 0x3066780] i16 v,h,dc,p: 29% 33% 11% 27%
[libx264 @ 0x3066780] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 12% 12% 7% 9% 12% 8% 12% 11%
[libx264 @ 0x3066780] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 15% 12% 7% 10% 12% 7% 10% 7%
[libx264 @ 0x3066780] i8c dc,h,v,p: 44% 22% 23% 11%
[libx264 @ 0x3066780] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x3066780] ref P L0: 73.2% 15.2% 7.9% 3.7%
[libx264 @ 0x3066780] ref B L0: 90.6% 9.0% 0.4%
[libx264 @ 0x3066780] ref B L1: 98.2% 1.8%
[libx264 @ 0x3066780] kb/s:480.51
[aac @ 0x3068d40] Qavg: 515.774
Aqui estão os vídeos de entrada da fonte:
- butterfly_base.mp4 - link
- party_overlay.mp4 - link
- car_overlay.mp4 - link
Aqui está o vídeo de saída, onde você pode observar os quadros perdidos no vídeo sobreposto do carro, onde o carro no vídeo para de rodar durante a reprodução:
Se eu remover todo o áudio completamente executando isto:
ffmpeg -y \
-i /wintmp/vid/butterfly_base.mp4 \
-i /wintmp/vid/party_overlay.mp4 \
-i /wintmp/vid/car_overlay.mp4 \
-pix_fmt yuv420p -r 30000/1001 -an -filter_complex " [1:v] setpts=PTS-STARTPTS+2/TB [v1] ; [0:v] [v1] overlay=x=50:y='if( gte(t,2), H-(t-2)*128, NAN)' [o1] ; [2:v] setpts=PTS-STARTPTS+3/TB,scale=width=320:height=240 [v2] ; [o1] [v2] overlay=x=100:y='if( gte(t,3), H-(t-3)*102.4, NAN)' [outv] " -map "[outv]" /wintmp/vid/combined_no_audio.mp4
Esta versão sem áudio não causa erros e processa o vídeo corretamente: link
O problema também parece relacionado ao número de sobreposições. Se eu fizer apenas uma sobreposição, o problema não ocorrerá.