我正在尝试使用FFMPEG转码一段非常大的帧数视频(4096 x 4096)。这是一个短视频-不到两分钟,但源视频文件大小为15.8GB。(该视频是设计用于投影在天文馆的圆顶上的动画。)
源文件是Quicktime MOV格式,包含未压缩的Photo-JPEG图像(也包括音频)。当我告诉FFMPEG将我的MOV文件转码为MP4文件时,它只是说:
Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
并没有什么太大的帮助,但是我已经检查过所有参数是否正确和/或默认设置。事实上,如果我将请求的输出大小更改为2048x2048,则一切都正常工作。这就是为什么我怀疑编码器存在上限。
我很困惑。任何导致成功转码的建议都将不胜感激。(此时,我也愿意考虑FFMPEG的替代方案。)
相关事实
我从脚本中运行FFMPEG:
set srcFile=%1
set dstFile=%srcFile:.mov=.mp4%
ffmpeg -i %srcFile% -movflags faststart -q:a 0 -q:v 0 -pix_fmt yuv420p -sws_flags gauss -s 4096x4096 %dstFile%
输出结果
ffmpeg version N-50911-g9efcfbe Copyright (c) 2000-2013 the FFmpeg developers
built on Mar 13 2013 21:26:48 with gcc 4.7.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --ena
ble-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
libavutil 52. 19.100 / 52. 19.100
libavcodec 55. 0.100 / 55. 0.100
libavformat 55. 0.100 / 55. 0.100
libavdevice 54. 4.100 / 54. 4.100
libavfilter 3. 45.103 / 3. 45.103
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 2.100 / 52. 2.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'also-sprach-zarathustra-4k.mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
creation_time : 2013-01-11 23:41:30
Duration: 00:01:40.57, start: 0.000000, bitrate: 1357694 kb/s
Stream #0:0(eng): Audio: pcm_s16be (twos / 0x736F7774), 44100 Hz, stereo, s16, 1411 kb/s
Metadata:
creation_time : 2013-01-11 23:41:30
handler_name : Apple Alias Data Handler
Stream #0:1(eng): Video: mjpeg (jpeg / 0x6765706A), yuvj420p, 4096x4096 [SAR 1:1 DAR 1:1], 1356281 kb/s, 30 fps, 30
tbr, 3k tbn, 3k tbc
Metadata:
creation_time : 2013-01-11 23:41:30
handler_name : Apple Alias Data Handler
File 'also-sprach-zarathustra-4k.mp4' already exists. Overwrite ? [y/N] y
using SAR=1/1
[libx264 @ 003b9c80] frame MB size (256x256) > level limit (36864)
[libx264 @ 003b9c80] DPB size (4 frames, 262144 mbs) > level limit (2 frames, 184320 mbs)
[libx264 @ 003b9c80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI1 BMI2
x264 [error]: malloc of size 17305600 failed
Output #0, mp4, to 'also-sprach-zarathustra-4k.mp4':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
Stream #0:0(eng): Video: h264, yuv420p, 4096x4096 [SAR 1:1 DAR 1:1], q=-1--1, 90k tbn, 30 tbc
Metadata:
creation_time : 2013-01-11 23:41:30
handler_name : Apple Alias Data Handler
Stream #0:1(eng): Audio: none, 44100 Hz, stereo, s16, 128 kb/s
Metadata:
creation_time : 2013-01-11 23:41:30
handler_name : Apple Alias Data Handler
Stream mapping:
Stream #0:1 -> #0:0 (mjpeg -> libx264)
Stream #0:0 -> #0:1 (pcm_s16be -> libvo_aacenc)
Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
提示:是的,对于那些在家玩游戏的人来说,这是电影《2001太空漫游》的主题曲。你可以在这里看到一个1K的YouTube版本:2001 - A Fulldome Space Odyssey。而且,在一个拥有良好音响系统的天文馆,它绝对是史诗级别的。