如何解决在 MP4 上覆盖透明的 webm 有时会在开始时冻结
我目前正在使用该命令
ffmpeg -i mainvideo.mp4 -vcodec libvpx -i myoverlay.webm -filter_complex "overlay = 5:5" done.mp4
在我的主 mp4 之上覆盖一个透明的 webm。但由于某种原因，输出视频在前 1~ 秒被冻结，但音频完全正常。
我已经在其他视频中尝试过这个命令，它有时可以工作，但大多数时候前几帧似乎冻结
编辑。 我有两个主要的 mp4 文件，broken_source.mp4 和working_source.mp4。将叠加层放在broken_source 上会导致输出的前1~ 秒视频冻结（音频完全正常），但在working_source.mp4 上放置相同的叠加层是完美的，没有问题
将覆盖层放在working_source 上的日志：
ffmpeg -i working_source.mp4 -vcodec libvpx -i chat.webm -filter_complex "overlay = 0:0" working_complete.mp4
ffmpeg version 4.3.1-2021-01-01-full_build-www.gyan.dev copyright (c) 2000-2021 the FFmpeg developers
built with gcc 10.2.0 (Rev5,Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
libavutil 56. 51.100 / 56. 51.100
libavcodec 58. 91.100 / 58. 91.100
libavformat 58. 45.100 / 58. 45.100
libavdevice 58. 10.100 / 58. 10.100
libavfilter 7. 85.100 / 7. 85.100
libswscale 5. 7.100 / 5. 7.100
libswresample 3. 7.100 / 3. 7.100
libpostproc 55. 7.100 / 55. 7.100
Input #0,mov,mp4,m4a,3gp,3g2,mj2,from 'working_source.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.51.101
Duration: 00:00:31.02,start: 0.000000,bitrate: 6176 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661),yuv420p(tv,bt709),1920x1080 [SAR 1:1 DAR 16:9],6035 kb/s,60 fps,60 tbr,90k tbn,120 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D),48000 Hz,stereo,fltp,128 kb/s (default)
Metadata:
handler_name : SoundHandler
[libvpx @ 0000016fb5074a80] v1.9.0-128-g3a38edea2
Last message repeated 1 times
Input #1,matroska,webm,from 'chat.webm':
Metadata:
ENCODER : Lavf58.51.101
Duration: 00:00:31.00,bitrate: 449 kb/s
Stream #1:0: Video: vp8,yuva420p(tv,progressive),500x300,SAR 1:1 DAR 5:3,1k tbn,1k tbc (default)
Metadata:
alpha_mode : 1
ENCODER : Lavc58.101.101 libvpx
DURATION : 00:00:31.000000000
[libvpx @ 0000016fb50761c0] v1.9.0-128-g3a38edea2
Stream mapping:
Stream #0:0 (h264) -> overlay:main (graph 0)
Stream #1:0 (libvpx) -> overlay:overlay (graph 0)
overlay (graph 0) -> Stream #0:0 (libx264)
Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop,[?] for help
[libvpx @ 0000016fb50761c0] v1.9.0-128-g3a38edea2
[libx264 @ 0000016fb5072040] using SAR=1/1
[libx264 @ 0000016fb5072040] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0000016fb5072040] profile High,level 4.2,4:2:0,8-bit
[libx264 @ 0000016fb5072040] 264 - core 161 r3027 4121277 - H.264/MPEG-4 AVC codec - copyleft 2003-2020 - 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,to 'working_complete.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.45.100
Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661),yuv420p,q=-1--1,15360 tbn,60 tbc (default)
Metadata:
encoder : Lavc58.91.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D),128 kb/s (default)
Metadata:
handler_name : SoundHandler
encoder : Lavc58.91.100 aac
frame= 1861 fps= 44 q=-1.0 Lsize= 20013kB time=00:00:31.01 bitrate=5285.3kbits/s speed=0.729x
video:19477kB audio:486kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.244893%
[libx264 @ 0000016fb5072040] frame I:8 Avg QP:19.04 size:240534
[libx264 @ 0000016fb5072040] frame P:538 Avg QP:23.76 size: 23836
[libx264 @ 0000016fb5072040] frame B:1315 Avg QP:31.66 size: 3951
[libx264 @ 0000016fb5072040] consecutive B-frames: 3.0% 3.5% 14.8% 78.7%
[libx264 @ 0000016fb5072040] mb I I16..4: 6.4% 47.4% 46.2%
[libx264 @ 0000016fb5072040] mb P I16..4: 1.2% 4.2% 1.9% P16..4: 21.4% 5.3% 2.9% 0.0% 0.0% skip:63.1%
[libx264 @ 0000016fb5072040] mb B I16..4: 0.1% 0.2% 0.1% B16..8: 12.6% 1.5% 0.5% direct: 0.4% skip:84.6% L0:35.9% L1:60.0% BI: 4.1%
[libx264 @ 0000016fb5072040] 8x8 transform intra:55.5% inter:60.0%
[libx264 @ 0000016fb5072040] coded y,uvDC,uvAC intra: 63.5% 77.4% 40.4% inter: 3.7% 4.6% 0.7%
[libx264 @ 0000016fb5072040] i16 v,h,dc,p: 19% 37% 15% 29%
[libx264 @ 0000016fb5072040] i8 v,ddl,ddr,vr,hd,vl,hu: 16% 18% 23% 7% 7% 7% 7% 6% 8%
[libx264 @ 0000016fb5072040] i4 v,hu: 20% 22% 17% 7% 8% 7% 7% 6% 6%
[libx264 @ 0000016fb5072040] i8c dc,v,p: 45% 27% 18% 11%
[libx264 @ 0000016fb5072040] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0000016fb5072040] ref P L0: 74.5% 13.9% 9.1% 2.5%
[libx264 @ 0000016fb5072040] ref B L0: 91.9% 7.4% 0.7%
[libx264 @ 0000016fb5072040] ref B L1: 96.6% 3.4%
[libx264 @ 0000016fb5072040] kb/s:5144.05
[aac @ 0000016fb5026a80] Qavg: 193.230
将覆盖层放置在broken_source上的日志：
ffmpeg -i broken_source.mp4 -vcodec libvpx -i chat.webm -filter_complex "overlay = 0:0" broken_complete.mp4
ffmpeg version 4.3.1-2021-01-01-full_build-www.gyan.dev copyright (c) 2000-2021 the FFmpeg developers
built with gcc 10.2.0 (Rev5,from 'broken_source.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.26.101
Duration: 00:00:45.02,bitrate: 5962 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661),5952 kb/s,128 kb/s (default)
Metadata:
handler_name : SoundHandler
[libvpx @ 0000021071f90280] v1.9.0-128-g3a38edea2
Last message repeated 1 times
Input #1,1k tbc (default)
Metadata:
alpha_mode : 1
ENCODER : Lavc58.101.101 libvpx
DURATION : 00:00:31.000000000
[libvpx @ 0000021072020dc0] v1.9.0-128-g3a38edea2
Stream #0:0 (h264) -> overlay:main (graph 0)
Stream #1:0 (libvpx) -> overlay:overlay (graph 0)
overlay (graph 0) -> Stream #0:0 (libx264)
Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop,[?] for help
[libvpx @ 0000021072020dc0] v1.9.0-128-g3a38edea2
[libx264 @ 0000021072022980] using SAR=1/1
[libx264 @ 0000021072022980] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0000021072022980] profile High,8-bit
[libx264 @ 0000021072022980] 264 - core 161 r3027 4121277 - H.264/MPEG-4 AVC codec - copyleft 2003-2020 - 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,to 'broken_complete.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.45.100
Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661),128 kb/s (default)
Metadata:
handler_name : SoundHandler
encoder : Lavc58.91.100 aac
frame= 2701 fps= 47 q=-1.0 Lsize= 23020kB time=00:00:45.01 bitrate=4189.5kbits/s dup=60 drop=0 speed=0.789x
video:22242kB audio:708kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.309473%
[libx264 @ 0000021072022980] frame I:11 Avg QP:18.82 size:210832
[libx264 @ 0000021072022980] frame P:742 Avg QP:23.14 size: 18106
[libx264 @ 0000021072022980] frame B:1948 Avg QP:31.16 size: 3604
[libx264 @ 0000021072022980] consecutive B-frames: 1.7% 4.2% 6.2% 87.8%
[libx264 @ 0000021072022980] mb I I16..4: 10.0% 46.2% 43.7%
[libx264 @ 0000021072022980] mb P I16..4: 1.6% 4.5% 1.5% P16..4: 16.5% 4.2% 2.4% 0.0% 0.0% skip:69.3%
[libx264 @ 0000021072022980] mb B I16..4: 0.1% 0.3% 0.1% B16..8: 11.3% 1.4% 0.4% direct: 0.4% skip:86.0% L0:36.5% L1:59.3% BI: 4.3%
[libx264 @ 0000021072022980] 8x8 transform intra:57.4% inter:64.8%
[libx264 @ 0000021072022980] coded y,uvAC intra: 55.4% 42.1% 14.8% inter: 3.3% 2.1% 0.3%
[libx264 @ 0000021072022980] i16 v,p: 21% 37% 15% 27%
[libx264 @ 0000021072022980] i8 v,hu: 18% 18% 24% 6% 7% 6% 7% 6% 7%
[libx264 @ 0000021072022980] i4 v,hu: 21% 22% 16% 7% 7% 7% 7% 6% 6%
[libx264 @ 0000021072022980] i8c dc,p: 58% 22% 15% 5%
[libx264 @ 0000021072022980] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0000021072022980] ref P L0: 68.9% 16.6% 10.8% 3.6%
[libx264 @ 0000021072022980] ref B L0: 91.6% 7.2% 1.2%
[libx264 @ 0000021072022980] ref B L1: 95.9% 4.1%
[libx264 @ 0000021072022980] kb/s:4047.35
[aac @ 0000021072024840] Qavg: 189.405
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