python - ffmpeg 创建的 mp4 无法与 IPython.display.Video 一起播放

Question

我正在使用以下命令从 jpegs 和 ffmpeg 创建一个 mp4 视频:ffmpeg -y -threads 0 -f image2 -i jpegs/%05d.jpg -framerate 10 video.mp4生成的视频可以在 VLC 上正常播放，但无法在 Jupyter 笔记本中通过以下方式播放:

from IPython.display import Video
Video('video.mp4')

这个笔记本视频功能过去对我有用，所以我认为视频功能无法解决编解码器/mime 类型的某些问题？

请求更新
我试过的新命令: ffmpeg -y -framerate 10 -i jpegs/%05d.jpg -vf format=yuv420p -movflags +faststart video.mp4视频在 VLC 中仍然可以正常播放，但在 Jupyter 中仍然无法播放。我查看了标记为的重复项，但实际上似乎不是同一个问题..
这是输出(我删除了帧率和线程标志以简化):

algo-1-poqk5_1  | 2020-11-18 21:19:36 [INFO]: ffmpeg output:
algo-1-poqk5_1  | 2020-11-18 21:19:36 [INFO]: ffmpeg version 4.0 Copyright (c) 2000-2018 the FFmpeg developers
algo-1-poqk5_1  |   built with gcc 7.2.0 (crosstool-NG fa8859cb)
algo-1-poqk5_1  |   configuration: --prefix=/opt/conda --cc=/opt/conda/conda-bld/ffmpeg_1531088893642/_build_env/bin/x86_64-conda_cos6-linux-gnu-cc --disable-doc --enable-shared --enable-static --enable-zlib --enable-pic --enable-gpl --enable-version3 --disable-nonfree --enable-hardcoded-tables --enable-avresample --enable-libfreetype --disable-openssl --disable-gnutls --enable-libvpx --enable-pthreads --enable-libopus --enable-postproc --disable-libx264
algo-1-poqk5_1  |   libavutil      56. 14.100 / 56. 14.100
algo-1-poqk5_1  |   libavcodec     58. 18.100 / 58. 18.100
algo-1-poqk5_1  |   libavformat    58. 12.100 / 58. 12.100
algo-1-poqk5_1  |   libavdevice    58.  3.100 / 58.  3.100
algo-1-poqk5_1  |   libavfilter     7. 16.100 /  7. 16.100
algo-1-poqk5_1  |   libavresample   4.  0.  0 /  4.  0.  0
algo-1-poqk5_1  |   libswscale      5.  1.100 /  5.  1.100
algo-1-poqk5_1  |   libswresample   3.  1.100 /  3.  1.100
algo-1-poqk5_1  |   libpostproc    55.  1.100 / 55.  1.100
algo-1-poqk5_1  | Input #0, image2, from '/opt/ml/model/outputs/01-IR.mp4_1/%05d.jpg':
algo-1-poqk5_1  |   Duration: 00:00:12.00, start: 0.000000, bitrate: N/A
algo-1-poqk5_1  |     Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
algo-1-poqk5_1  | Stream mapping:
algo-1-poqk5_1  |   Stream #0:0 -> #0:0 (mjpeg (native) -> mpeg4 (native))
algo-1-poqk5_1  | Press [q] to stop, [?] for help
algo-1-poqk5_1  | [swscaler @ 0x55b8cc6fcc40] deprecated pixel format used, make sure you did set range correctly
algo-1-poqk5_1  | Output #0, mp4, to '/opt/ml/model/outputs/01-IR.mp4_1/video.mp4':
algo-1-poqk5_1  |   Metadata:
algo-1-poqk5_1  |     encoder         : Lavf58.12.100
algo-1-poqk5_1  |     Stream #0:0: Video: mpeg4 (mp4v / 0x7634706D), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 25 fps, 12800 tbn, 25 tbc
algo-1-poqk5_1  |     Metadata:
algo-1-poqk5_1  |       encoder         : Lavc58.18.100 mpeg4
algo-1-poqk5_1  |     Side data:
algo-1-poqk5_1  |       cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
algo-1-poqk5_1  | frame=   31 fps=0.0 q=31.0 size=     768kB time=00:00:01.20 bitrate=5242.8kbits/s speed=2.33x    
algo-1-poqk5_1  | frame=   64 fps= 63 q=31.0 size=    1280kB time=00:00:02.52 bitrate=4161.0kbits/s speed=2.48x    
algo-1-poqk5_1  | frame=   98 fps= 64 q=31.0 size=    1792kB time=00:00:03.88 bitrate=3783.5kbits/s speed=2.53x    
algo-1-poqk5_1  | frame=  131 fps= 64 q=31.0 size=    2304kB time=00:00:05.20 bitrate=3629.7kbits/s speed=2.55x    
algo-1-poqk5_1  | frame=  164 fps= 64 q=31.0 size=    2560kB time=00:00:06.52 bitrate=3216.5kbits/s speed=2.56x    
algo-1-poqk5_1  | frame=  198 fps= 65 q=31.0 size=    3072kB time=00:00:07.88 bitrate=3193.6kbits/s speed=2.58x    
algo-1-poqk5_1  | frame=  232 fps= 65 q=31.0 size=    3328kB time=00:00:09.24 bitrate=2950.6kbits/s speed= 2.6x    
algo-1-poqk5_1  | frame=  266 fps= 66 q=31.0 size=    3840kB time=00:00:10.60 bitrate=2967.7kbits/s speed=2.62x    
algo-1-poqk5_1  | frame=  299 fps= 66 q=31.0 size=    4096kB time=00:00:11.92 bitrate=2815.0kbits/s speed=2.62x    
algo-1-poqk5_1  | [mp4 @ 0x55b8cc658900] Starting second pass: moving the moov atom to the beginning of the file
algo-1-poqk5_1  | frame=  300 fps= 65 q=31.0 Lsize=    4202kB time=00:00:11.96 bitrate=2877.9kbits/s speed=2.61x    
algo-1-poqk5_1  | video:4199kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.052020%

Answer 1

algo-1-poqk5_1  | Stream mapping:
algo-1-poqk5_1  |   Stream #0:0 -> #0:0 (mjpeg (native) -> mpeg4 (native))

它正在编码为 mpeg4。您需要更兼容的编解码器，例如 h.264