Início / computer / Perguntas / 1671061
Accepted
Hashim Aziz
Asked: 2021-08-24 07:28:53 +0800 CST

Erro "Não é possível alocar memória" ao fazer crossfading

  • 772

Adaptei o algoritmo de Gyan para crossfading - do qual prefiro os resultados xfade- para concatenar dois vídeos e fazer crossfade com um terceiro:

ffmpeg -i "source1.mp4" -i "source2.mp4" -i "source3.mp4" \
-preset ultrafast \
-movflags faststart \
-filter_complex \
"color=black:1440x1080:d=1789.145[base]; \
[0:v]scale=1440x1080,setpts=PTS-STARTPTS[v0]; \
[1:v]scale=1440x1080,trim=start=15.5,setpts=PTS-STARTPTS+((593.106000)/TB)[v1]; \
[2:v]scale=1440x1080,format=yuva420p,fade=in:st=0:d=2:alpha=1,setpts=PTS-STARTPTS+((1186.028000)/TB)[v2]; \
[base][v1]overlay[tmp]; \
[tmp][v2]overlay,format=yuv420p[crossfade]; \
[v0][crossfade]concat=n=2:v=1:a=0[fv]; \
[1:a]atrim=start=15.5,asetpts=PTS-STARTPTS[a1]; \
[0:a][a1]concat=n=2:v=0:a=1[aconcat]; \
[aconcat][2:a]acrossfade=d=2[fa]" \
-map "[fv]" -map "[fa]" -c:v libx264 -crf 15 -c:a libopus -shortest "test1.mp4"

Depois de codificar cerca de metade do que seria o comprimento final do vídeo e usar todos os 16 GB da minha RAM, o FFmpeg finalmente se esgota e trava.

Veja como ficou o uso de memória no Gerenciador de Tarefas logo após a falha:

insira a descrição da imagem aqui

E aqui está a saída completa:

ffmpeg version N-100422-gff6f8c272e-g1eb751955e+1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.2.0 (Rev6, Built by MSYS2 project)
  configuration:  --pkg-config=pkgconf --cc='ccache gcc' --cxx='ccache g++' --disable-autodetect --enable-amf --enable-bzlib --enable-
cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-iconv --enable-lzma --enable-nvenc --enable-zlib --enable-sdl2 --enable-f
fnvcodec --enable-nvdec --enable-cuda-llvm --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --
enable-libx265 --enable-libdav1d --enable-libaom --disable-debug --enable-libfdk-aac --enable-openssl --extra-libs=-liconv --enable-gp
l --enable-nonfree
  libavutil      56. 62.100 / 56. 62.100
  libavcodec     58.115.102 / 58.115.102
  libavformat    58. 65.100 / 58. 65.100
  libavdevice    58. 11.103 / 58. 11.103
  libavfilter     7. 93.100 /  7. 93.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'source1.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.65.100
  Duration: 00:09:54.11, start: 0.000000, bitrate: 372 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 320x240, 242 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'source2.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.65.100
  Duration: 00:09:52.92, start: 0.000000, bitrate: 315 kb/s
    Stream #1:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 181 kb/s, 25 fps, 25 tbr, 12800 tbn,
 50 tbc (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc.
      vendor_id       : [0][0][0][0]
    Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc.
      vendor_id       : [0][0][0][0]
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'source3.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.65.100
  Duration: 00:10:02.12, start: 0.000000, bitrate: 314 kb/s
    Stream #2:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 180 kb/s, 25 fps, 25 tbr, 12800 tbn,
 50 tbc (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc.
      vendor_id       : [0][0][0][0]
    Stream #2:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc.
      vendor_id       : [0][0][0][0]
File 'test1.mp4' already exists. Overwrite? [y/N] y
Stream mapping:
  Stream #0:0 (h264) -> scale
  Stream #0:1 (aac) -> concat:in0:a0
  Stream #1:0 (h264) -> scale
  Stream #1:1 (aac) -> atrim
  Stream #2:0 (h264) -> scale
  Stream #2:1 (aac) -> acrossfade:crossfade1
  concat -> Stream #0:0 (libx264)
  acrossfade -> Stream #0:1 (libopus)
Press [q] to stop, [?] for help
[libx264 @ 000002475283b600] using SAR=1/1
[libx264 @ 000002475283b600] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 000002475283b600] profile Constrained Baseline, level 4.0, 4:2:0, 8-bit
[libx264 @ 000002475283b600] 264 - core 161 r3027 4121277 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264
.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 tre
llis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 in
terlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=crf mbtree=0
 crf=15.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
[libopus @ 0000024752837f40] No bit rate set. Defaulting to 96000 bps.
Output #0, mp4, to 'test1.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.65.100
    Stream #0:0: Video: h264 (avc1 / 0x31637661), yuv420p(tv, progressive), 1440x1080 [SAR 1:1 DAR 4:3], q=2-31, 25 fps, 12800 tbn (de
fault)
    Metadata:
      encoder         : Lavc58.115.102 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
    Stream #0:1: Audio: opus (Opus / 0x7375704F), 48000 Hz, stereo, flt, 96 kb/s (default)
    Metadata:
      encoder         : Lavc58.115.102 libopus
Error while filtering: Cannot allocate memorye=00:16:48.79 bitrate=7107.6kbits/s speed=3.19x
    Last message repeated 1 times
Failed to inject frame into filter network: Cannot allocate memory
Error while processing the decoded data for stream #1:0
[libx264 @ 000002475283b600] frame I:101   Avg QP: 7.17  size:104091
[libx264 @ 000002475283b600] frame P:25125 Avg QP: 9.65  size: 34810
[libx264 @ 000002475283b600] mb I  I16..4: 100.0%  0.0%  0.0%
[libx264 @ 000002475283b600] mb P  I16..4:  3.9%  0.0%  0.0%  P16..4: 37.3%  0.0%  0.0%  0.0%  0.0%    skip:58.8%
[libx264 @ 000002475283b600] coded y,uvDC,uvAC intra: 36.5% 45.6% 16.1% inter: 23.8% 13.9% 0.3%
[libx264 @ 000002475283b600] i16 v,h,dc,p: 43% 29% 11% 16%
[libx264 @ 000002475283b600] i8c dc,h,v,p: 39% 26% 14% 21%
[libx264 @ 000002475283b600] kb/s:7017.47
[libopus @ 0000024752837f40] 1 frames left in the queue on closing
Conversion failed!

Isso é um bug ou apenas algo no meu comando que estou perdendo?

memory ffmpeg

1 respostas

  1. Best Answer

    Depois de alguns dias lutando com esse problema, determinei que, pelo menos em minha própria experiência, é sempre causado por números que não somam, como um -ssque excede a duração do vídeo ou SETPTSvalores calculados incorretamente.

    Eu ainda acredito que isso é um bug por dois motivos:

    • Porque não é apenas um caso de FFmpeg esgotando toda a memória disponível como eu suspeitei, mas usando quantidades significativas de memória rapidamente antes de eventualmente travar enquanto ainda há memória disponível

    • Porque o FFmpeg deve realmente detectar e lançar erros quando parâmetros que obviamente não computam vão consumir grandes quantidades de memória antes de inevitavelmente travar

    • 1

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