x265转码为x264后视频仍频繁缓冲的问题咨询

架构老林

2026-4-22

我大部分x265格式的视频播放时每5秒就会缓冲一次，于是我尝试用ffmpeg将它们转码为x264格式，原本计划用-crf 25和-vf format=yuv420p参数，实际转码时用的是下面的命令，但转码之后视频还是会频繁缓冲，这到底是怎么回事？

以下是原视频的ffprobe输出信息：

ffprobe version n6.0 Copyright (c) 2007-2023 the FFmpeg developers
built with gcc 13.1.1 (GCC) 20230525
configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libjxl --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librav1e --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-nvdec --enable-nvenc --enable-opencl --enable-opengl --enable-shared --enable-version3 --enable-vulkan
libavutil      58.  2.100 / 58.  2.100
libavcodec     60.  3.100 / 60.  3.100
libavformat    60.  3.100 / 60.  3.100
libavdevice    60.  1.100 / 60.  1.100
libavfilter     9.  3.100 /  9.  3.100
libswscale      7.  1.100 /  7.  1.100
libswresample   4. 10.100 /  4. 10.100
libpostproc    57.  1.100 / 57.  1.100
Input #0, matroska,webm, from 'video.1080p.BluRay.x265.mkv':
Metadata:
title           : VIDEO
encoder         : libebml v1.3.5 + libmatroska v1.4.8
creation_time   : 2018-10-20T02:21:06.000000Z
Writing frontend: StaxRip v1.7.0.6
Duration: 01:36:21.82, start: 0.000000, bitrate: 5100 kb/s
Chapters:
Chapter #0:0: start 0.000000, end 345.345000
Metadata:
title           : Chapter 01
Chapter #0:1: start 345.345000, end 717.341625
Metadata:
title           : Chapter 02
Chapter #0:2: start 717.341625, end 920.920000
Metadata:
title           : Chapter 03
Chapter #0:3: start 920.920000, end 1126.291833
Metadata:
title           : Chapter 04
Chapter #0:4: start 1126.291833, end 1442.065625
Metadata:
title           : Chapter 05
Chapter #0:5: start 1442.065625, end 1856.855000
Metadata:
title           : Chapter 06
Chapter #0:6: start 1856.855000, end 2085.249833
Metadata:
title           : Chapter 07
Chapter #0:7: start 2085.249833, end 2373.371000
Metadata:
title           : Chapter 08
Chapter #0:8: start 2373.371000, end 2902.900000
Metadata:
title           : Chapter 09
Chapter #0:9: start 2902.900000, end 3124.121000
Metadata:
title           : Chapter 10
Chapter #0:10: start 3124.121000, end 3200.822625
Metadata:
title           : Chapter 11
Chapter #0:11: start 3200.822625, end 3582.078500
Metadata:
title           : Chapter 12
Chapter #0:12: start 3582.078500, end 4108.687917
Metadata:
title           : Chapter 13
Chapter #0:13: start 4108.687917, end 4355.517833
Metadata:
title           : Chapter 14
Chapter #0:14: start 4355.517833, end 4676.046375
Metadata:
title           : Chapter 15
Chapter #0:15: start 4676.046375, end 4885.881000
Metadata:
title           : Chapter 16
Chapter #0:16: start 4885.881000, end 5349.886208
Metadata:
title           : Chapter 17
Chapter #0:17: start 5349.886208, end 5781.820000
Metadata:
title           : Chapter 18
Stream #0:0: Video: hevc (Main 10), yuv420p10le(tv), 1800x1080, SAR 1:1 DAR 5:3, 23.98 fps, 23.98 tbr, 1k tbn (default)
Metadata:
BPS             : 4998377
BPS-eng         : 4998377
DURATION        : 01:36:21.818000000
DURATION-eng    : 01:36:21.818000000
NUMBER_OF_FRAMES: 138625
NUMBER_OF_FRAMES-eng: 138625
NUMBER_OF_BYTES : 3612463661
NUMBER_OF_BYTES-eng: 3612463661
_STATISTICS_WRITING_APP: mkvmerge v20.0.0 ('I Am The Sun') 64-bit
_STATISTICS_WRITING_APP-eng: mkvmerge v20.0.0 ('I Am The Sun') 64-bit
_STATISTICS_WRITING_DATE_UTC: 2018-10-20 02:21:06
_STATISTICS_WRITING_DATE_UTC-eng: 2018-10-20 02:21:06
_STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Stream #0:1(eng): Audio: aac (LC), 48000 Hz, mono, fltp (default)
Metadata:
BPS             : 90004
BPS-eng         : 90004
DURATION        : 01:36:21.802000000
DURATION-eng    : 01:36:21.802000000
NUMBER_OF_FRAMES: 271022
NUMBER_OF_FRAMES-eng: 271022
NUMBER_OF_BYTES : 65048307
NUMBER_OF_BYTES-eng: 65048307
_STATISTICS_WRITING_APP: mkvmerge v20.0.0 ('I Am The Sun') 64-bit
_STATISTICS_WRITING_APP-eng: mkvmerge v20.0.0 ('I Am The Sun') 64-bit
_STATISTICS_WRITING_DATE_UTC: 2018-10-20 02:21:06
_STATISTICS_WRITING_DATE_UTC-eng: 2018-10-20 02:21:06
_STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Stream #0:2(eng): Subtitle: dvd_subtitle, 1920x1080
Metadata:
BPS             : 17354
BPS-eng         : 17354
DURATION        : 01:34:38.953000000
DURATION-eng    : 01:34:38.953000000
NUMBER_OF_FRAMES: 1766
NUMBER_OF_FRAMES-eng: 1766
NUMBER_OF_BYTES : 12319366
NUMBER_OF_BYTES-eng: 12319366
_STATISTICS_WRITING_APP: mkvmerge v20.0.0 ('I Am The Sun') 64-bit
_STATISTICS_WRITING_APP-eng: mkvmerge v20.0.0 ('I Am The Sun') 64-bit
_STATISTICS_WRITING_DATE_UTC: 2018-10-20 02:21:06
_STATISTICS_WRITING_DATE_UTC-eng: 2018-10-20 02:21:06
_STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Stream #0:3: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 640x360 [SAR 72:72 DAR 16:9], 90k tbr, 90k tbn (attached pic)
Metadata:
filename        : cover.jpg
mimetype        : image/jpeg

我实际使用的转码命令：

ffmpeg -i video.1080p.BluRay.x265.mkv -vf format=yuv420p -c:v libx264 -crf 23 -c:a copy -c:s copy video.1080p.BluRay.x264.mp4

我的播放环境：

家庭网络使用Cat6网线连接
Plex媒体服务器版本4.100.1，运行在Asustor NAS上
播放端是不支持HDR的三星4K电视，安装的「Plex for Samsung」版本为5.64.1，平台版本为5

备注：内容来源于stack exchange，提问作者ablrbls072