ffmpeg从H.264(高4:4:4配置文件)转换为H.264(主配置文件) [英] ffmpeg convert from H.264 (High 4:4:4 Profile) to H.264 (Main Profile)
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问题描述
如何使用ffmpeg将视频从H.264(高4:4:4配置文件)转换为H.264(主配置文件)?
How can I convert a video from H.264 (High 4:4:4 Profile) to H.264 (Main Profile) using ffmpeg?
我无法使用此命令: ffmpeg -i 1 / 25359.mp4 -profile:v main out.mp4
。
I can't do that with this command: ffmpeg -i 1/25359.mp4 -profile:v main out.mp4
.
会返回错误:
...
That'd return an error:
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1/25359.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf56.40.101
Duration: 00:00:06.08, start: 0.000000, bitrate: 1059 kb/s
Stream #0:0(und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuv444p, 351x297, 1057 kb/s, 12.50 fps, 12.50 tbr, 12800 tbn, 25 tbc (default)
Metadata:
handler_name : VideoHandler
No pixel format specified, yuv444p for H.264 encoding chosen.
Use -pix_fmt yuv420p for compatibility with outdated media players.
x264 [error]: main profile doesn't support 4:4:4
[libx264 @ 0x8fa9640] Error setting profile main.
[libx264 @ 0x8fa9640] Possible profiles: baseline main high high10 high422 high444
Output #0, mp4, to '1/24545.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf56.40.101
Stream #0:0(und): Video: h264, none, q=2-31, 128 kb/s, 12.50 fps (default)
Metadata:
handler_name : VideoHandler
encoder : Lavc56.60.100 libx264
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
推荐答案
您的源视频具有全尺寸色度平面 - 如后两者所示在YUV444P中的4s和主要配置文件不支持该格式,因此您必须选择像YUV 4:2:0的像素格式
Your source video has full-sized chroma planes - as indicated by the latter two 4s in YUV444P - and main profile doesn't support that format, so you'll have to select a pixel format like YUV 4:2:0
ffmpeg -i 1/25359.mp4 -vf "scale=2*trunc(iw/2):-2,setsar=1" -profile:v main -pix_fmt yuv420p out.mp4
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