因此，我一直在尝试在运行 debian Stretch 的 docker 容器中合并多个 mp4。我无法将输出 mp4 文件写入磁盘，因此我需要将 ffmpeg 文件输出通过管道传输到 stdout。我一直在使用以下命令。
$ffmpeg -i https://clips-media-assets.twitch.tv/214592710.mp4 -i https://clips-media-assets.twitch.tv/214731012.mp4 -i https://clips-media-assets.twitch.tv/28082606352-offset-2786.mp4 -i https://clips-media-assets.twitch.tv/214777342.mp4 -i https://clips-media-assets.twitch.tv/214638267.mp4 -i https://clips-media-assets.twitch.tv/214636156.mp4 -i https://clips-media-assets.twitch.tv/214804499.mp4 -i https://clips-media-assets.twitch.tv/214826823.mp4 -i https://clips-media-assets.twitch.tv/214741267.mp4 -i https://clips-media-assets.twitch.tv/214575427.mp4 -filter_complex "[0:v:0] [0:a:0] [1:v:0] [1:a:0] [2:v:0] [2:a:0] [3:v:0] [3:a:0] [4:v:0] [4:a:0] [5:v:0] [5:a:0] [6:v:0] [6:a:0] [7:v:0] [7:a:0] [8:v:0] [8:a:0] [9:v:0] [9:a:0] concat=n=10:v=1:a=1 [v] [a]" -map [v] -map [a] -frag_duration 3600 -f mp4 -
这会导致输出视频的预期部分被剪辑为几秒钟。
这是我从 stdErr 读取的 ffmpegs 输出，其中 docker 的 CPU 数量为 1，RAM 为 2 GB。
ffmpeg version 3.4.2-static https://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 6.3.0 (Debian 6.3.0-18) 20170516
configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libfribidi --enable-libass --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg
libavutil 55. 78.100 / 55. 78.100
libavcodec 57.107.100 / 57.107.100
libavformat 57. 83.100 / 57. 83.100
libavdevice 57. 10.100 / 57. 10.100
libavfilter 6.107.100 / 6.107.100
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'https://clips-media-assets.twitch.tv/214592710.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.71.100
Duration: 00:00:21.47, start: 0.000000, bitrate: 3678 kb/s
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc), 1280x720, 3501 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 163 kb/s (default)
Metadata:
handler_name : SoundHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'https://clips-media-assets.twitch.tv/214731012.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.71.100
Duration: 00:01:00.01, start: 0.000000, bitrate: 8782 kb/s
Stream #1:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc), 1280x720, 8606 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 164 kb/s (default)
Metadata:
handler_name : SoundHandler
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'https://clips-media-assets.twitch.tv/28082606352-offset-2786.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.71.100
Duration: 00:00:30.00, start: 0.000000, bitrate: 6181 kb/s
Stream #2:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc), 1280x720, 6002 kb/s, 60 fps, 60 tbr, 90k tbn, 120 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #2:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 163 kb/s (default)
Metadata:
handler_name : SoundHandler
Input #3, mov,mp4,m4a,3gp,3g2,mj2, from 'https://clips-media-assets.twitch.tv/214777342.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.71.100
Duration: 00:00:27.67, start: 0.000000, bitrate: 5891 kb/s
Stream #3:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc), 1280x720, 5715 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #3:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 164 kb/s (default)
Metadata:
handler_name : SoundHandler
Input #4, mov,mp4,m4a,3gp,3g2,mj2, from 'https://clips-media-assets.twitch.tv/214638267.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.71.100
Duration: 00:00:46.43, start: 0.000000, bitrate: 10449 kb/s
Stream #4:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc), 1280x720, 10273 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #4:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 163 kb/s (default)
Metadata:
handler_name : SoundHandler
Input #5, mov,mp4,m4a,3gp,3g2,mj2, from 'https://clips-media-assets.twitch.tv/214636156.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.71.100
Duration: 00:00:07.75, start: 0.000000, bitrate: 8070 kb/s
Stream #5:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc), 1280x720, 7892 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #5:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 163 kb/s (default)
Metadata:
handler_name : SoundHandler
Input #6, mov,mp4,m4a,3gp,3g2,mj2, from 'https://clips-media-assets.twitch.tv/214804499.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.71.100
Duration: 00:01:00.01, start: 0.000000, bitrate: 6529 kb/s
Stream #6:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc), 1280x720, 6354 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #6:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 163 kb/s (default)
Metadata:
handler_name : SoundHandler
Input #7, mov,mp4,m4a,3gp,3g2,mj2, from 'https://clips-media-assets.twitch.tv/214826823.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.71.100
Duration: 00:00:07.68, start: 0.000000, bitrate: 3713 kb/s
Stream #7:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc), 1280x720, 3536 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #7:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 163 kb/s (default)
Metadata:
handler_name : SoundHandler
Input #8, mov,mp4,m4a,3gp,3g2,mj2, from 'https://clips-media-assets.twitch.tv/214741267.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.71.100
Duration: 00:00:07.19, start: 0.000000, bitrate: 5785 kb/s
Stream #8:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc), 1280x720, 5610 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #8:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 165 kb/s (default)
Metadata:
handler_name : SoundHandler
Input #9, mov,mp4,m4a,3gp,3g2,mj2, from 'https://clips-media-assets.twitch.tv/214575427.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.71.100
Duration: 00:00:51.01, start: 0.000000, bitrate: 3874 kb/s
Stream #9:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc), 1280x720, 3698 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #9:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 164 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:0 (h264) -> concat:in0:v0
Stream #0:1 (aac) -> concat:in0:a0
Stream #1:0 (h264) -> concat:in1:v0
Stream #1:1 (aac) -> concat:in1:a0
Stream #2:0 (h264) -> concat:in2:v0
Stream #2:1 (aac) -> concat:in2:a0
Stream #3:0 (h264) -> concat:in3:v0
Stream #3:1 (aac) -> concat:in3:a0
Stream #4:0 (h264) -> concat:in4:v0
Stream #4:1 (aac) -> concat:in4:a0
Stream #5:0 (h264) -> concat:in5:v0
Stream #5:1 (aac) -> concat:in5:a0
Stream #6:0 (h264) -> concat:in6:v0
Stream #6:1 (aac) -> concat:in6:a0
Stream #7:0 (h264) -> concat:in7:v0
Stream #7:1 (aac) -> concat:in7:a0
Stream #8:0 (h264) -> concat:in8:v0
Stream #8:1 (aac) -> concat:in8:a0
Stream #9:0 (h264) -> concat:in9:v0
Stream #9:1 (aac) -> concat:in9:a0
concat:out:v0 -> Stream #0:0 (libx264)
concat:out:a0 -> Stream #0:1 (aac)
Press [q] to stop, [?] for help
[libx264 @ 0x88d3640] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x88d3640] profile High, level 3.2
[libx264 @ 0x88d3640] 264 - core 155 r2901 7d0ff22 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - 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 lookahead_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 'pipe:':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.83.100
Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuvj420p(pc, progressive), 1280x720, q=-1--1, 60 fps, 15360 tbn, 60 tbc (default)
Metadata:
encoder : Lavc57.107.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
Metadata:
encoder : Lavc57.107.100 aac
frame= 2320 fps= 20 q=31.0 size= 25147kB time=00:00:38.50 bitrate=5318.2kbits/s dup=1 drop=0 speed=0.334x
frame= 4560 fps= 17 q=31.0 size= 62654kB time=00:01:15.83 bitrate=6768.0kbits/s dup=1 drop=0 speed=0.275x
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x6109940] stream 1, offset 0x1187c5: partial filets/s dup=2 drop=0 speed=0.315x speed=0.275x
[h264 @ 0x69b8980] Invalid NAL unit size (10904 > 8072).39kB time=00:01:52.43 bitrate=5795.4kbits/s dup=2 drop=0 speed=0.315x
[h264 @ 0x69b8980] Error splitting the input into NAL units.
Error while decoding stream #3:0: Invalid data found when processing input
https://clips-media-assets.twitch.tv/214777342.mp4: Invalid data found when processing input
Last message repeated 2 times
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x69c01c0] stream 1, offset 0x124bed: partial filets/s dup=4 drop=0 speed=0.314x 0 speed=0.315x
[h264 @ 0x69e5220] Invalid NAL unit size (40844 > 37063).8kB time=00:01:53.36 bitrate=5817.7kbits/s dup=4 drop=0 speed=0.314x
[h264 @ 0x69e5220] Error splitting the input into NAL units.
Error while decoding stream #4:0: Invalid data found when processing input
https://clips-media-assets.twitch.tv/214638267.mp4: Invalid data found when processing input
Last message repeated 2 times
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x6e34300] stream 1, offset 0x134e04: partial filets/s dup=4 drop=0 speed=0.314x 0 speed=0.314x
[h264 @ 0x6e936e0] Invalid NAL unit size (3219 > 2887).
[h264 @ 0x6e936e0] Error splitting the input into NAL units.
Error while decoding stream #5:0: Invalid data found when processing input
https://clips-media-assets.twitch.tv/214636156.mp4: Invalid data found when processing input
Last message repeated 2 times
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x6e65f80] stream 1, offset 0x1411c1: partial filets/s dup=5 drop=0 speed=0.314x 0 speed=0.314x
[h264 @ 0x72c63c0] Invalid NAL unit size (5000 > 3708).841kB time=00:01:55.87 bitrate=5856.6kbits/s dup=5 drop=0 speed=0.314x
[h264 @ 0x72c63c0] Error splitting the input into NAL units.
Error while decoding stream #6:0: Invalid data found when processing input
https://clips-media-assets.twitch.tv/214804499.mp4: Invalid data found when processing input
Last message repeated 2 times
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x779e0e0] stream 1, offset 0x134b57: partial filets/s dup=6 drop=0 speed=0.316x 0 speed=0.314x
[h264 @ 0x7bec920] Invalid NAL unit size (18581 > 8590).18kB time=00:02:05.68 bitrate=5698.0kbits/s dup=6 drop=0 speed=0.316x
[h264 @ 0x7bec920] Error splitting the input into NAL units.
Error while decoding stream #8:0: Invalid data found when processing input
https://clips-media-assets.twitch.tv/214741267.mp4: Invalid data found when processing input
Last message repeated 2 times
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7bed200] stream 1, offset 0xdb7f6: partial fileits/s dup=6 drop=0 speed=0.317x 0 speed=0.317x
[h264 @ 0x84cbc60] Invalid NAL unit size (1625 > 440).
[h264 @ 0x84cbc60] Error splitting the input into NAL units.
Error while decoding stream #9:0: Invalid data found when processing input
https://clips-media-assets.twitch.tv/214575427.mp4: Invalid data found when processing input
Last message repeated 2 times
frame= 7655 fps= 19 q=31.0 Lsize= 88771kB time=00:02:07.54 bitrate=5701.5kbits/s dup=8 drop=0 speed=0.316x speed=0.317x
video:85056kB audio:2074kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.883764%
[libx264 @ 0x88d3640] frame I:40 Avg QP:22.85 size:143772
[libx264 @ 0x88d3640] frame P:2853 Avg QP:26.55 size: 20092
[libx264 @ 0x88d3640] frame B:4762 Avg QP:31.26 size: 5045
[libx264 @ 0x88d3640] consecutive B-frames: 2.8% 41.0% 5.4% 50.8%
[libx264 @ 0x88d3640] mb I I16..4: 13.8% 21.0% 65.2%
[libx264 @ 0x88d3640] mb P I16..4: 3.7% 3.7% 3.9% P16..4: 29.6% 13.4% 6.3% 0.0% 0.0% skip:39.4%
[libx264 @ 0x88d3640] mb B I16..4: 0.9% 0.6% 0.6% B16..8: 21.9% 5.6% 0.8% direct: 1.6% skip:68.1% L0:41.3% L1:46.4% BI:12.3%
[libx264 @ 0x88d3640] 8x8 transform intra:30.7% inter:37.6%
[libx264 @ 0x88d3640] coded y,uvDC,uvAC intra: 57.7% 42.7% 8.6% inter: 10.5% 5.6% 0.4%
[libx264 @ 0x88d3640] i16 v,h,dc,p: 28% 30% 22% 20%
[libx264 @ 0x88d3640] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 24% 22% 3% 3% 4% 5% 4% 5%
[libx264 @ 0x88d3640] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 20% 20% 5% 5% 6% 6% 5% 5%
[libx264 @ 0x88d3640] i8c dc,h,v,p: 66% 18% 14% 2%
[libx264 @ 0x88d3640] Weighted P-Frames: Y:2.4% UV:0.7%
[libx264 @ 0x88d3640] ref P L0: 68.0% 13.8% 15.7% 2.5% 0.0%
[libx264 @ 0x88d3640] ref B L0: 87.4% 11.4% 1.2%
[libx264 @ 0x88d3640] ref B L1: 98.8% 1.2%
[libx264 @ 0x88d3640] kb/s:5461.32
[aac @ 0x8076a00] Qavg: 721.442
有趣的是，当我增加 docker 的 CPU 数量时，它似乎对预期输出的修剪越来越少，直到我给 docker 6 个 CPU。此时，没有视频被修剪，并按预期合并所有视频。以及“无效的 NAL 单元大小”错误不再出现在输出中。作为 ffmpeg 的新手，任何关于在低 CPU 配置上使 mp4 连接更稳定的帮助都会很棒。