>>412
> $ ffmpeg -y -i input.wmv -c:v h264_qsv -q 20 output.mp4

それでもやっぱりエラーが返ってくるんですよね・・・
H.264(QSV)のビルドでミスをしちゃったんでしょうか？>>409の通り構築したんですが

Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, asf, from 'input.wmv':
Metadata:
encoder : Lavf56.15.102
Duration: 01:09:56.21, start: 0.000000, bitrate: 664 kb/s
Stream #0:0: Video: mpeg4 (Simple Profile) (M4S2 / 0x3253344D), yuv420p, 864
x480 [SAR 1:1 DAR 9:5], 29.97 fps, 29.97 tbr, 1k tbn, 30k tbc
Stream #0:1: Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz, 2 channels, fltp,
64 kb/s
[h264_qsv @ 00000000005d12e0] More than one of: { constant qscale, lookahead, VC
M } requested, only one of them can be used at a time.
Output #0, mp4, to 'output.mp4':
Metadata:
encoder : Lavf56.15.102
Stream #0:0: Video: h264, none, q=2-31, 128 kb/s, SAR 1:1 DAR 0:0, 29.97 fps

Metadata:
encoder : Lavc57.24.101 h264_qsv
Stream #0:1: Audio: aac, 0 channels, 128 kb/s
Metadata:
encoder : Lavc57.24.101 aac
Stream mapping:
Stream #0:0 -> #0:0 (mpeg4 (native) -> h264 (h264_qsv))
Stream #0:1 -> #0:1 (wmav2 (native) -> aac (native))
Error while opening encoder for output stream #0:0 - maybe incorrect parameters
such as bit_rate, rate, width or height