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Martin Hope
malat
Asked: 2020-11-25 23:57:48 +0800 CST
  • 5

我试图准确理解“null”格式的含义。我确实从以下位置阅读了文档：

但我无法理解以下情况。考虑：

$ ffmpeg -y -hide_banner -i input.mkv -ss 0 -t 1 -an -sn -c:v mpeg4 -f mp4 /dev/null
[mpeg4 @ 0x562dc220aa00] Failed to parse extradata
Input #0, matroska,webm, from 'input.mkv':
  Metadata:
    ENCODER         : Lavf58.20.100
  Duration: 01:07:47.92, start: 0.000000, bitrate: 1433 kb/s
    Stream #0:0: Video: mpeg4 (Advanced Simple Profile), yuv420p, 688x512 [SAR 1:1 DAR 43:32], 25 fps, 25 tbr, 1k tbn, 25 tbc (default)
    Metadata:
      DURATION        : 01:07:47.920000000
    Stream #0:1: Audio: mp3, 48000 Hz, stereo, fltp, 80 kb/s (default)
    Metadata:
      DURATION        : 01:07:47.880000000
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg4 (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
Output #0, mp4, to '/dev/null':
  Metadata:
    encoder         : Lavf58.20.100
    Stream #0:0: Video: mpeg4 (mp4v / 0x7634706D), yuv420p, 688x512 [SAR 1:1 DAR 43:32], q=2-31, 200 kb/s, 25 fps, 12800 tbn, 25 tbc (default)
    Metadata:
      DURATION        : 01:07:47.920000000
      encoder         : Lavc58.35.100 mpeg4
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
frame=   25 fps=0.0 q=1.6 Lsize=      16kB time=00:00:00.96 bitrate= 140.1kbits/s dup=2 drop=0 speed=32.3x    
video:15kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 6.221970%

使用空格式时：

$ ffmpeg -y -hide_banner -i input.mkv -ss 0 -t 1 -an -sn -c:v mpeg4 -f null /dev/null
[mpeg4 @ 0x5645807d5a00] Failed to parse extradata
Input #0, matroska,webm, from 'input.mkv':
  Metadata:
    ENCODER         : Lavf58.20.100
  Duration: 01:07:47.92, start: 0.000000, bitrate: 1433 kb/s
    Stream #0:0: Video: mpeg4 (Advanced Simple Profile), yuv420p, 688x512 [SAR 1:1 DAR 43:32], 25 fps, 25 tbr, 1k tbn, 25 tbc (default)
    Metadata:
      DURATION        : 01:07:47.920000000
    Stream #0:1: Audio: mp3, 48000 Hz, stereo, fltp, 80 kb/s (default)
    Metadata:
      DURATION        : 01:07:47.880000000
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg4 (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
Output #0, null, to '/dev/null':
  Metadata:
    encoder         : Lavf58.20.100
    Stream #0:0: Video: mpeg4, yuv420p, 688x512 [SAR 1:1 DAR 43:32], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc (default)
    Metadata:
      DURATION        : 01:07:47.920000000
      encoder         : Lavc58.35.100 mpeg4
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
[mpeg4 @ 0x564580804380] Invalid pts (2) <= last (3)
Video encoding failed
Conversion failed!

我应该如何解释上述错误？下面重复：

[mpeg4 @ 0x564580804380] Invalid pts (2) <= last (3)
Video encoding failed
Conversion failed!

更新，使用-enc_time_base -1给出：

$ ffmpeg -y -hide_banner -i input.mkv -ss 0 -t 1 -an -sn -c:v mpeg4 -enc_time_base -1  -f null /dev/null 
[mpeg4 @ 0x561134551ac0] Failed to parse extradata
Input #0, matroska,webm, from 'input.mkv':
  Metadata:
    ENCODER         : Lavf58.20.100
  Duration: 01:07:47.92, start: 0.000000, bitrate: 1433 kb/s
    Stream #0:0: Video: mpeg4 (Advanced Simple Profile), yuv420p, 688x512 [SAR 1:1 DAR 43:32], 25 fps, 25 tbr, 1k tbn, 25 tbc (default)
    Metadata:
      DURATION        : 01:07:47.920000000
    Stream #0:1: Audio: mp3, 48000 Hz, stereo, fltp, 80 kb/s (default)
    Metadata:
      DURATION        : 01:07:47.880000000
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg4 (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
Output #0, null, to '/dev/null':
  Metadata:
    encoder         : Lavf58.20.100
    Stream #0:0: Video: mpeg4, yuv420p, 688x512 [SAR 1:1 DAR 43:32], q=2-31, 200 kb/s, 25 fps, 1k tbn, 1k tbc (default)
    Metadata:
      DURATION        : 01:07:47.920000000
      encoder         : Lavc58.35.100 mpeg4
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
[mpeg4 @ 0x561134582100] Invalid pts (80) <= last (120)
Video encoding failed
Conversion failed!
linux video
Martin Hope
malat
Asked: 2020-05-27 01:49:06 +0800 CST
  • 8

我一直在尝试使用 nouveau 调试错误，现在我想删除以前的设置。

这是我看到的：

% dmesg | grep nouveau
[...]
[    1.487361] [drm:nouveau_drm_init [nouveau]] ... debug        : PTHERM=debug,PTIMER=debug

兼容：

# cat /sys/module/nouveau/parameters/debug 
PTHERM=debug,PTIMER=debug

此设置存储在哪里？

我尝试了一个天真的：

% find /etc/modprobe.d 
/etc/modprobe.d
/etc/modprobe.d/nouveau.conf

这使：

% cat /etc/modprobe.d/nouveau.conf
# debug nouveau
options nouveau debug="PFIFO=debug"
debian-buster kernel-module
Martin Hope
malat
Asked: 2020-01-30 05:04:30 +0800 CST
  • 5

我正在尝试重新安装 Windows XP SP3（不要问），我正在按照以下说明进行操作：

但是我被困在第（3）项上：

  • Windows XP 更新 (KB927891)

链接：

工作正常，但是如果我转到 XP 链接，这会导致：

今天是：

$ HEAD "http://www.microsoft.com/downloads/details.aspx?familyid=7a81b0cd-a0b9-497e-8a89-404327772e5a"
503 Service Unavailable
Connection: close
Date: Wed, 29 Jan 2020 13:03:47 GMT
Content-Length: 176
Content-Type: text/html
Expires: Wed, 29 Jan 2020 13:03:47 GMT
Client-Date: Wed, 29 Jan 2020 13:03:47 GMT
Client-Peer: 23.40.97.126:80
Client-Response-Num: 1
Mime-Version: 1.0
TLS_version: UNKNOWN
X-Reference-Error: 119.65aacd17.1580303027.3321a58
X-RTag: StMus

其他参考：

在哪里可以找到 KB927891？

windows-xp