问题描述
我已经尝试了几乎所有关于如何使字幕工作的建议，在 Windows 中它一直有效，在 android 上却没有。我在输出中看到了所需的库。
命令： ffmpeg -y -i "input.mp4" -vf captions=MySubtitle.srt "output.mp4"
我看到这个错误信息 “W/mobile-ffmpeg：[graph 0 input from stream 0:0 @ 0x752e80aa90] sws_param 选项已弃用并被忽略” 但我找不到这方面的帮助。
以下是ffmpeg的输出：
I/mobile-ffmpeg: Loading mobile-ffmpeg.
I/mobile-ffmpeg: Loaded mobile-ffmpeg-full-gpl-arm64-v8a-4.4-20200725.
D/mobile-ffmpeg: Callback thread started.
I/mobile-ffmpeg: ffmpeg version v4.4-dev-416
copyright (c) 2000-2020 the FFmpeg developers
I/mobile-ffmpeg: built with Android (6454773 based on r365631c2) clang version 9.0.8 (https://android.googlesource.com/toolchain/llvm-project 98c855489587874b2a325e7a516b99d838599c6f) (based on LLVM 9.0.8svn)
configuration: --cross-prefix=aarch64-linux-android- --sysroot=/files/android-sdk/ndk/21.3.6528147/toolchains/llvm/prebuilt/linux-x86_64/sysroot --prefix=/home/taner/Projects/mobile-ffmpeg/prebuilt/android-arm64/ffmpeg --pkg-config=/usr/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --cc=aarch64-linux-android24-clang --cxx=aarch64-linux-android24-clang++ --extra-libs='-L/home/taner/Projects/mobile-ffmpeg/prebuilt/android-arm64/cpu-features/lib -lndk_compat' --target-os=android --enable-neon --enable-asm --enable-inline-asm --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --enable-shared --enable-v4l2-m2m --disable-outdev=fbdev --disable-indev=fbdev --enable-small --disable-openssl --disable-xmm-clobber-test --disable-debug --enable-lto --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-static --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-videotoolBox --disable-audiotoolBox --disable-appkit --disable-alsa --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-gmp --enable-gnutls --enable-libmp3lame --enable-libass --enable-iconv --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libxml2 --enable-libopencore-amrnb --enable-libshine --enable-libspeex --enable-libwavpack --enable-libkvazaar --enable-libx264 --enable-gpl --enable-libxvid --enable-gpl --enable-libx265 --enable-gpl --enable-libvidstab --enable-gpl --enable-libilbc --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libaom --enable-libtwolame --disable-sdl2 --enable-libvo-amrwbenc --enable-zlib --enable-mediacodec
libavutil 56. 55.100 / 56. 55.100
I/mobile-ffmpeg: libavcodec 58. 96.100 / 58. 96.100
libavformat 58. 48.100 / 58. 48.100
libavdevice 58. 11.101 / 58. 11.101
I/mobile-ffmpeg: libavfilter 7. 87.100 / 7. 87.100
libswscale 5. 8.100 / 5. 8.100
I/mobile-ffmpeg: libswresample 3. 8.100 / 3. 8.100
I/mobile-ffmpeg: Input #0,mov,mp4,m4a,3gp,3g2,mj2,from '/data/user/0/com.example.MaiClips/files/Pc5//MYrender/finalrender.mp4':
Metadata:
I/mobile-ffmpeg: major_brand :
isom
I/mobile-ffmpeg: minor_version :
512
I/mobile-ffmpeg: compatible_brands:
isomiso2avc1mp41
I/mobile-ffmpeg: encoder :
I/mobile-ffmpeg: Lavf58.48.100
Duration:
00:40:11.94
I/mobile-ffmpeg:,start:
0.000000,bitrate:
I/mobile-ffmpeg: 183 kb/s
Stream #0:0
I/mobile-ffmpeg: (und)
: Video: h264 (avc1 / 0x31637661),yuv420p,640x480 [SAR 1:1 DAR 4:3],65 kb/s,I/mobile-ffmpeg: 15 fps,15 tbr,I/mobile-ffmpeg: 15360 tbn,30 tbc
I/mobile-ffmpeg: (default)
Metadata:
handler_name :
I/mobile-ffmpeg: VideoHandler
Stream #0:1
I/mobile-ffmpeg: (und)
: Audio: aac (mp4a / 0x6134706D),44100 Hz,stereo,fltp,129 kb/s
(default)
I/mobile-ffmpeg: Metadata:
handler_name :
I/mobile-ffmpeg: SoundHandler
I/mobile-ffmpeg: Stream mapping:
Stream #0:0 -> #0:0
(h264 (native) -> h264 (libx264))
I/mobile-ffmpeg: Stream #0:1 -> #0:1
I/mobile-ffmpeg: (aac (native) -> aac (native))
Press [q] to stop,[?] for help
I/mobile-ffmpeg: [Parsed_subtitles_0 @ 0x752e7eb590] Shaper: FriBidi 1.0.9 (SIMPLE)
I/mobile-ffmpeg: [Parsed_subtitles_0 @ 0x752e7eb590]
W/mobile-ffmpeg: [Parsed_subtitles_0 @ 0x752e7eb590] No usable fontconfig configuration file found,using fallback.
[Parsed_subtitles_0 @ 0x752e7eb590]
I/mobile-ffmpeg: [Parsed_subtitles_0 @ 0x752e7eb590] Using font provider fontconfig
[Parsed_subtitles_0 @ 0x752e7eb590]
W/mobile-ffmpeg: [graph 0 input from stream 0:0 @ 0x752e80aa90] sws_param option is deprecated and ignored
I/mobile-ffmpeg: [libx264 @ 0x759e882b60] using SAR=1/1
I/mobile-ffmpeg: [libx264 @ 0x759e882b60] using cpu capabilities: ARMv8 NEON
I/mobile-ffmpeg: [libx264 @ 0x759e882b60] profile High,level 2.2,4:2:0,8-bit
I/mobile-ffmpeg: [libx264 @ 0x759e882b60] 264 - core 160 - 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=15 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 '/data/user/0/com.example.MaiClips/files/Pc5//MYrender/Maipodcast.mp4':
Metadata:
major_brand :
I/mobile-ffmpeg: isom
I/mobile-ffmpeg: minor_version :
512
compatible_brands:
I/mobile-ffmpeg: isomiso2avc1mp41
I/mobile-ffmpeg: encoder :
Lavf58.48.100
I/mobile-ffmpeg: Stream #0:0
I/mobile-ffmpeg: (und)
: Video: h264 (libx264) (avc1 / 0x31637661),q=-1--1
I/mobile-ffmpeg:,15 fps,15360 tbn,15 tbc
I/mobile-ffmpeg: (default)
Metadata:
handler_name :
I/mobile-ffmpeg: VideoHandler
encoder :
I/mobile-ffmpeg: Lavc58.96.100 libx264
Side data:
I/mobile-ffmpeg:
cpb:
bitrate max/min/avg: 0/0/0 buffer size: 0
vbv_delay: N/A
I/mobile-ffmpeg: Stream #0:1
(und)
: Audio: aac (mp4a / 0x6134706D),128 kb/s
I/mobile-ffmpeg: (default)
Metadata:
handler_name :
I/mobile-ffmpeg: SoundHandler
encoder :
Lavc58.96.100 aac
W/Choreographer: Frame time is 0.005891 ms in the future! Check that graphics HAL is generating vsync timestamps using the correct timebase.
I/mobile-ffmpeg: frame= 50 fps=0.0 q=0.0 size= 0kB time=00:00:03.76 bitrate= 0.1kbits/s speed=7.51x
I/mobile-ffmpeg: frame= 109 fps=108 q=27.0 size= 0kB time=00:00:07.73 bitrate= 0.0kbits/s speed=7.69x
I/mobile-ffmpeg: frame= 159 fps=105 q=27.0 size= 256kB time=00:00:11.05 bitrate= 189.8kbits/s speed=7.33x
I/mobile-ffmpeg: frame= 6317 fps=161 q=27.0 size= 9472kB time=00:07:00.55 bitrate= 184.5kbits/s speed=10.7x
I/mobile-ffmpeg: frame= 6422 fps=162 q=27.0 size= 9472kB time=00:07:07.57 bitrate= 181.5kbits/s speed=10.8x
I/mobile-ffmpeg: frame= 6518 fps=162 q=27.0 size= 9728kB time=00:07:14.02 bitrate= 183.6kbits/s speed=10.8x
I/mobile-ffmpeg: frame= 6623 fps=163 q=27.0 size= 9728kB time=00:07:20.99 bitrate= 180.7kbits/s speed=10.8x
I/mobile-ffmpeg: frame= 6717 fps=163 q=27.0 size= 9728kB time=00:07:27.26 bitrate= 178.2kbits/s speed=10.9x
I/mobile-ffmpeg: frame= 6816 fps=164 q=27.0 size= 9984kB time=00:07:33.85 bitrate= 180.2kbits/s speed=10.9x
I/mobile-ffmpeg: frame= 6918 fps=164 q=27.0 size= 9984kB time=00:07:40.66 bitrate= 177.5kbits/s speed=10.9x
I/mobile-ffmpeg: frame=25322 fps=165 q=27.0 size= 37632kB time=00:28:08.57 bitrate= 182.6kbits/s speed= 11x
I/mobile-ffmpeg: frame=25356 fps=165 q=27.0 size= 37888kB time=00:28:09.85 bitrate= 183.7kbits/s speed= 11x
I/mobile-ffmpeg: frame=25387 fps=165 q=27.0 size= 37888kB time=00:28:11.94 bitrate= 183.4kbits/s speed= 11x
I/mobile-ffmpeg: frame=25418 fps=164 q=27.0 size= 38144kB time=00:28:14.01 bitrate= 184.5kbits/s speed=10.9x
I/mobile-ffmpeg: frame=25456 fps=164 q=27.0 size= 38400kB time=00:28:16.51 bitrate= 185.4kbits/s speed=10.9x
I/mo
I/mobile-ffmpeg: frame=28946 fps=147 q=27.0 size= 51200kB time=00:40:07.25 bitrate= 174.2kbits/s speed=12.2x
I/mobile-ffmpeg: frame=28956 fps=146 q=-1.0 Lsize= 53050kB time=00:40:11.92 bitrate= 180.2kbits/s speed=12.2x
video:14025kB audio:37969kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead:
2.030667%
I/mobile-ffmpeg: [libx264 @ 0x759e882b60] frame I:130 Avg QP:12.19 size: 33043
I/mobile-ffmpeg: [libx264 @ 0x759e882b60] frame P:7764 Avg QP:14.75 size: 871
[libx264 @ 0x759e882b60] frame B:21062 Avg QP:19.97 size: 157
[libx264 @ 0x759e882b60] consecutive B-frames: 2.4% 1.4% 1.3% 94.9%
[libx264 @ 0x759e882b60] mb I I16..4: 15.1% 70.4% 14.5%
[libx264 @ 0x759e882b60] mb P I16..4: 0.3% 1.1% 0.1% P16..4: 6.3% 2.3% 1.2% 0.0% 0.0% skip:88.7%
I/mobile-ffmpeg: [libx264 @ 0x759e882b60] mb B I16..4: 0.0% 0.1% 0.0% B16..8: 3.2% 0.3% 0.0% direct: 0.2% skip:96.1% L0:47.5% L1:47.1% BI: 5.4%
[libx264 @ 0x759e882b60] 8x8 transform intra:72.9% inter:79.7%
[libx264 @ 0x759e882b60] coded y,uvDC,uvAC intra: 64.6% 72.0% 41.8% inter: 1.2% 2.0% 0.1%
I/mobile-ffmpeg: [libx264 @ 0x759e882b60] i16 v,h,dc,p: 54% 13% 11% 21%
[libx264 @ 0x759e882b60] i8 v,ddl,ddr,vr,hd,vl,hu: 29% 15% 24% 4% 5% 7% 4% 7% 5%
[libx264 @ 0x759e882b60] i4 v,hu: 36% 16% 13% 4% 7% 10% 5% 7% 3%
[libx264 @ 0x759e882b60] i8c dc,v,p: 44% 20% 27% 9%
I/mobile-ffmpeg: [libx264 @ 0x759e882b60] Weighted P-Frames: Y:0.1% UV:0.0%
[libx264 @ 0x759e882b60] ref P L0: 64.1% 13.4% 14.9% 7.6% 0.0%
[libx264 @ 0x759e882b60] ref B L0: 83.6% 13.9% 2.5%
I/mobile-ffmpeg: [libx264 @ 0x759e882b60] ref B L1: 96.5% 3.5%
[libx264 @ 0x759e882b60] kb/s:59.52
I/mobile-ffmpeg: [aac @ 0x759e885f20] Qavg: 299.818
I/mobile-ffmpeg: Command execution completed successfully.
D/addpodcastLayout:: Finished: finished
D/MediaPlayerNative: getMetadata
W/MediaPlayerNative: info/warning (3,0)
解决方法
我发现了几个问题：希望这篇笔记能帮助到其他人
- 时：分：秒，毫秒的格式（注意毫秒的逗号，其他的用冒号。 错误：我将秒数放入分钟槽中，
- 时间向上滚动时的转换错误不会将秒数转换为分钟数
- 检查subtitle.srt的最后一行，确保最后一次输入不为零
- 时间顺序必须是连续的，如果中间的任何时间戳小于之前的时间戳，将不会显示字幕
- 如果在subtitle.srt 中将句子分成两行，它将显示为换行。