当我尝试使用 ffmpeg 将 mkv 转换为 mp4 时，出现以下错误：
version 0.8.3-4:0.8.3-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the Libav developers built on Jun 12 2012 16:52:09 with gcc 4.6.3
*** THIS PROGRAM IS DEPRECATED *** This program is only provided for compatibility and will be removed in a future release. Please use
avconv instead. [matroska,webm @ 0x1e939c0] max_analyze_duration
reached [matroska,webm @ 0x1e939c0] Estimating duration from
bitrate, this may be inaccurate Input #0, matroska,webm, from
'input.mkv': Duration: 00:01:00.76, start: 0.000000, bitrate: 384
kb/s
Stream #0.0(eng): Video: …