ffmpeg - ffmpeg：在 android 上播放视频的问题

Question

（翻译）你好！我有以下问题。我连接多个 ts 文件并使用 ffmpeg 转换为 mp4。我以自动方式多次执行此操作，因此我并不总是检查结果，但每当我这样做时，在计算机上，获得的结果都符合预期。但是，某些视频在 Android 设备上播放时，在任何应用程序中都无法正确显示：Chrome、Firefox、Vlc 等。我使用的 ffmpeg 版本是最新的。这是我使用的命令：

ffmpeg.exe -hwaccel dxva2 -y -f concat -i list.txt -acodec copy -vcodec copy output.mp4 -preset normal

结果：

个人电脑

安卓

这是ffmpeg的输出：

ffmpeg version n4.3.1-26-gca55240b8c Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.3-win32 (GCC) 20200320
  configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-opencl --enable-libvmaf --disable-vulkan --enable-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-libdavs2 --enable-ffnvcodec --enable-cuda-llvm --disable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-librubberband --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libtwolame --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libzimg --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
  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
Trailing option(s) found in the command: may be ignored.
Input #0, concat, from 'list.txt':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Data: timed_id3 (ID3  / 0x20334449)
    Stream #0:1: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, unknown/bt470bg/unknown, progressive), 320x568, 29.50 fps, 29.50 tbr, 90k tbn, 180k tbc
    Stream #0:2: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, mono, fltp, 64 kb/s
Output #0, mp4, to 'output.mp4':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0: Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, unknown/bt470bg/unknown, progressive), 320x568, q=2-31, 29.50 fps, 29.50 tbr, 90k tbn, 90k tbc
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 64 kb/s
Stream mapping:
  Stream #0:1 -> #0:0 (copy)
  Stream #0:2 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 9504 fps=8330 q=-1.0 Lsize=   24561kB time=00:07:42.26 bitrate= 435.3kbits/s speed= 405x
video:21200kB audio:3100kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.073735%

并非所有视频都是“yuv420p（电视，未知 / bt470bg / 未知，渐进式）”，但这不应该是问题，因为在 Android 上可以正确看到具有此信息的其他视频。

要更正此类视频，我执行以下操作：

ffmpeg -y -f concat -i list.txt -c:v libx264 -preset slow -crf 22 -pix_fmt yuv420p -c:a aac -b:a 128k output.mp4

所以我让视频在 pc 和 Android 上都能正确播放。不幸的是，总是使用最后一行来自动化这个过程偶尔会导致问题（开始文件 40MB，结束文件> 1GB，超过 2 小时）

如果可能，我想帮助我确定哪些视频会在 Android 上被错误地观看。非常感谢您提前。最后，这是 ffmpeg 在执行我修复文件的行时给出的答案：

ffmpeg version n4.3.1-26-gca55240b8c Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.3-win32 (GCC) 20200320
  configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-opencl --enable-libvmaf --disable-vulkan --enable-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-libdavs2 --enable-ffnvcodec --enable-cuda-llvm --disable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-librubberband --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libtwolame --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libzimg --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
  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, concat, from 'list.txt':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Data: timed_id3 (ID3  / 0x20334449)
    Stream #0:1: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, unknown/bt470bg/unknown, progressive), 320x568, 29.50 fps, 29.50 tbr, 90k tbn, 180k tbc
    Stream #0:2: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, mono, fltp, 64 kb/s
Stream mapping:
  Stream #0:1 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:2 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 000001efdbaee540] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 000001efdbaee540] profile High, level 3.0, 4:2:0, 8-bit
[libx264 @ 000001efdbaee540] 264 - core 161 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=1 ref=5 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=8 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=2 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=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=crf mbtree=1 crf=22.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'd.mp4':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 320x568, q=-1--1, 29.50 fps, 15104 tbn, 29.50 tbc
    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: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc58.91.100 aac
More than 1000 frames duplicated    8960kB time=00:02:06.74 bitrate= 579.1kbits/s dup=999 drop=0 speed=15.7x
frame=13638 fps=468 q=-1.0 Lsize=   32033kB time=00:07:42.20 bitrate= 567.8kbits/s dup=4134 drop=0 speed=15.9x
video:25547kB audio:5995kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.557852%
[libx264 @ 000001efdbaee540] frame I:87    Avg QP:19.17  size: 12750
[libx264 @ 000001efdbaee540] frame P:4630  Avg QP:21.89  size:  4286
[libx264 @ 000001efdbaee540] frame B:8921  Avg QP:23.89  size:   583
[libx264 @ 000001efdbaee540] consecutive B-frames:  8.9%  8.6%  9.1% 73.4%
[libx264 @ 000001efdbaee540] mb I  I16..4: 12.2% 76.2% 11.6%
[libx264 @ 000001efdbaee540] mb P  I16..4:  3.7% 11.0%  0.8%  P16..4: 37.1% 16.2%  5.7%  0.0%  0.0%    skip:25.4%
[libx264 @ 000001efdbaee540] mb B  I16..4:  0.3%  0.9%  0.1%  B16..8: 30.4%  3.1%  0.3%  direct: 0.8%  skip:64.2%  L0:51.4% L1:44.3% BI: 4.3%
[libx264 @ 000001efdbaee540] 8x8 transform intra:71.2% inter:66.8%
[libx264 @ 000001efdbaee540] direct mvs  spatial:99.9% temporal:0.1%
[libx264 @ 000001efdbaee540] coded y,uvDC,uvAC intra: 52.5% 42.1% 5.5% inter: 9.7% 9.0% 0.3%
[libx264 @ 000001efdbaee540] i16 v,h,dc,p: 19% 21%  9% 50%
[libx264 @ 000001efdbaee540] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 11% 13%  6%  9% 11%  9% 11%  8%
[libx264 @ 000001efdbaee540] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23%  9%  8%  6% 14% 14% 11%  9%  6%
[libx264 @ 000001efdbaee540] i8c dc,h,v,p: 46% 20% 23% 12%
[libx264 @ 000001efdbaee540] Weighted P-Frames: Y:2.9% UV:0.8%
[libx264 @ 000001efdbaee540] ref P L0: 72.3% 12.2% 11.3%  2.1%  1.9%  0.2%  0.0%
[libx264 @ 000001efdbaee540] ref B L0: 93.1%  5.5%  1.1%  0.3%
[libx264 @ 000001efdbaee540] ref B L1: 97.6%  2.4%
[libx264 @ 000001efdbaee540] kb/s:452.67
[aac @ 000001efdbaee9c0] Qavg: 10682.834

标签： ffmpeg