我正在编写一个使用ffmpeg库接口（libavcodec，libavformat，libavutil等）的库来处理一些视频。其中部分涉及一些我正在使用libx264的编码。一切正常，但是libx264将输出写入stderr，例如：
[libx264 @ 0x62cbc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 AVX512
[libx264 @ 0x62cbc0] profile High, level 5.0, 4:2:0, 8-bit
[libx264 @ 0x62cbc0] frame I:28 Avg QP:26.78 size:144822
[libx264 @ 0x62cbc0] frame P:135 Avg QP:32.21 size: 30853
[libx264 @ 0x62cbc0] frame B:108 Avg QP:36.18 size: 15709
[libx264 @ 0x62cbc0] consecutive B-frames: 20.3% 79.7%
[libx264 @ 0x62cbc0] mb I I16..4: 9.5% 75.9% 14.6%
[libx264 @ 0x62cbc0] mb P I16..4: 1.1% 1.5% 1.4% P16..4: 44.8% 9.6% 4.2% 0.0% 0.0% skip:37.5%
[libx264 @ 0x62cbc0] mb B I16..4: 0.3% 0.2% 0.4% B16..8: 49.8% 4.6% 0.9% direct: 1.0% skip:42.7% L0:46.9% L1:49.8% BI: 3.2%
[libx264 @ 0x62cbc0] final ratefactor: 26.71
[libx264 @ 0x62cbc0] 8x8 transform intra:68.4% inter:70.4%
[libx264 @ 0x62cbc0] direct mvs spatial:87.0% temporal:13.0%
[libx264 @ 0x62cbc0] coded y,uvDC,uvAC intra: 76.2% 73.8% 31.6% inter: 9.7% 9.5% 4.2%
[libx264 @ 0x62cbc0] i16 v,h,dc,p: 9% 57% 7% 27%
[libx264 @ 0x62cbc0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 9% 21% 4% 8% 9% 7% 12% 7% 22%
[libx264 @ 0x62cbc0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 13% 28% 9% 6% 6% 6% 10% 6% 16%
[libx264 @ 0x62cbc0] i8c dc,h,v,p: 20% 50% 19% 11%
[libx264 @ 0x62cbc0] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x62cbc0] ref P L0: 73.2% 12.6% 10.0% 2.7% 1.1% 0.3%
[libx264 @ 0x62cbc0] ref B L0: 92.3% 5.6% 1.7% 0.4%
[libx264 @ 0x62cbc0] kb/s:7912.01
我的库无法写入stdout或stderr。如何以编程方式禁用此输出到stderr？
我意识到我可以“劫持” stderr，但这似乎是一个粗暴的黑客，我强烈希望不要这样做。