我正在尝试为ffmpeg找到一个工作示例来合并4个视频（2x2堆栈）和9个不同分辨率的视频（3x3堆栈）。
对于2x2示例，我目前正在使用文档示例，但仅当所有视频的分辨率相同时才有效。见命令
ffmpeg -i top_l.mp4 -i top_r.mp4 -i bottom_l.mp4 -i bottom_r.mp4 -i audio.mp4 \
-filter_complex "[0:v][1:v]hstack[t];[2:v][3:v]hstack[b];[t][b]vstack[v]" \
-map "[v]" -an -sn -shortest -f flv rtmp://server/stream
这对我的视频输入无效，但出现以下错误。
[Parsed_vstack_2 @ 0000000003245cc0] Input 1 width 1440 does not match input 0 width 1264.
[Parsed_vstack_2 @ 0000000003245cc0] Failed to configure output pad on Parsed_vstack_2
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while decoding stream #3:0: Invalid argument
[Parsed_vstack_2 @ 00000000033fec20] Input 1 width 1440 does not match input 0 width 1264.
[Parsed_vstack_2 @ 00000000033fec20] Failed to configure output pad on Parsed_vstack_2
Error reinitializing filters!
Error while filtering: Invalid argument
[Parsed_vstack_2 @ 00000000033feb40] Input 1 width 1440 does not match input 0 width 1264.
[Parsed_vstack_2 @ 00000000033feb40] Failed to configure output pad on Parsed_vstack_2
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while decoding stream #0:0: Invalid argument
[Parsed_vstack_2 @ 00000000033fec20] Input 1 width 1440 does not match input 0 width 1264.
[Parsed_vstack_2 @ 00000000033fec20] Failed to configure output pad on Parsed_vstack_2
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while decoding stream #1:0: Invalid argument
[Parsed_vstack_2 @ 00000000033fece0] Input 1 width 1440 does not match input 0 width 1264.
[Parsed_vstack_2 @ 00000000033fece0] Failed to configure output pad on Parsed_vstack_2
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while decoding stream #2:0: Invalid argument
[Parsed_vstack_2 @ 00000000033ff1c0] Input 1 width 1440 does not match input 0 width 1264.
[Parsed_vstack_2 @ 00000000033ff1c0] Failed to configure output pad on Parsed_vstack_2
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while decoding stream #3:0: Invalid argument
Finishing stream 0:0 without any data written to it.
[Parsed_vstack_2 @ 00000000033fec20] Input 1 width 1440 does not match input 0 width 1264.
[Parsed_vstack_2 @ 00000000033fec20] Failed to configure output pad on Parsed_vstack_2
Error configuring filter graph
Conversion failed!
如果有人知道如何进行3x3堆叠，请随时发表评论。