fate: change fate-ffmpeg-attached_pics to encode to pcm_s16le

Previously alac encoder was used, from a first glance I thought it is bitexact,
but it turns out it is using floating point arithmetic as well, so probably it
is not. Fixes fate failures on mingw32/64.
Signed-off-by: Marton Balint <cus@passwd.hu>

tests/fate/ffmpeg.mak

@@ -30,9 +30,9 @@ fate-ffmpeg-filter_complex: CMD = framecrc -filter_complex color=d=1:r=5 -fflags
 FATE_FFMPEG-$(call ALLYES, AEVALSRC_FILTER ASETNSAMPLES_FILTER AC3_FIXED_ENCODER) += fate-ffmpeg-filter_complex_audio
 fate-ffmpeg-filter_complex_audio: CMD = framecrc -filter_complex "aevalsrc=0:d=0.1,asetnsamples=1537" -c ac3_fixed
 
-# Ticket 6375
-FATE_SAMPLES_FFMPEG-$(call ALLYES, MOV_DEMUXER PNG_DECODER ALAC_DECODER ALAC_ENCODER) += fate-ffmpeg-attached_pics
-fate-ffmpeg-attached_pics: CMD = threads=2 framecrc -i $(TARGET_SAMPLES)/lossless-audio/inside.m4a -acodec alac -max_muxing_queue_size 16
+# Ticket 6375, use case of NoX
+FATE_SAMPLES_FFMPEG-$(call ALLYES, MOV_DEMUXER PNG_DECODER ALAC_DECODER PCM_S16LE_ENCODER RAWVIDEO_ENCODER) += fate-ffmpeg-attached_pics
+fate-ffmpeg-attached_pics: CMD = threads=2 framecrc -i $(TARGET_SAMPLES)/lossless-audio/inside.m4a -c:a pcm_s16le -max_muxing_queue_size 16
 
 FATE_SAMPLES_FFMPEG-$(CONFIG_COLORKEY_FILTER) += fate-ffmpeg-filter_colorkey
 fate-ffmpeg-filter_colorkey: tests/data/filtergraphs/colorkey

tests/ref/fate/ffmpeg-attached_pics

-#extradata 1:       36, 0x45f80468
 #tb 0: 1/90000
 #media_type 0: video
 #codec_id 0: rawvideo
@@ -6,136 +5,136 @@
 #sar 0: 2834/2834
 #tb 1: 1/44100
 #media_type 1: audio
-#codec_id 1: alac
+#codec_id 1: pcm_s16le
 #sample_rate 1: 44100
 #channel_layout 1: 3
 #channel_layout_name 1: stereo
 0,          0,          0,        0,   120000, 0x748cc771
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-1,     212992,     212992,     4096,     9490, 0xa8cc1e93
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-1,     266240,     266240,     4096,    12051, 0x881feda5
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-1,     290816,     290816,     4096,    12084, 0x36dde3c4
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-1,     413696,     413696,     4096,     9648, 0xf29a7d52
-1,     417792,     417792,     4096,     9077, 0xddc149ad
-1,     421888,     421888,     4096,     9759, 0x38d0b78d
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-1,     430080,     430080,     4096,    11585, 0x114310ec
-1,     434176,     434176,     4096,    11137, 0x6f420692
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-1,     442368,     442368,     4096,    11682, 0xe68452b7
-1,     446464,     446464,     4096,    11186, 0x899175ec
-1,     450560,     450560,     4096,     9933, 0xac27d52f
-1,     454656,     454656,     4096,    11609, 0xb6e31541
-1,     458752,     458752,     4096,    11632, 0x4898412b
-1,     462848,     462848,     4096,    11132, 0x6a3d6295
-1,     466944,     466944,     4096,    11960, 0xcc76d187
-1,     471040,     471040,     4096,    11196, 0x384f57ef
-1,     475136,     475136,     4096,    10619, 0x0e6d2961
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-1,     483328,     483328,     4096,    11190, 0x28785152
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+1,          0,          0,     4096,    16384, 0x00000000
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+1,     102400,     102400,     4096,    16384, 0x5c09dc3c
+1,     106496,     106496,     4096,    16384, 0xe5aabb75
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+1,     114688,     114688,     4096,    16384, 0x69a6e3c0
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+1,     389120,     389120,     4096,    16384, 0x863bcff5
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+1,     401408,     401408,     4096,    16384, 0xfe269f0a
+1,     405504,     405504,     4096,    16384, 0x47b9c0ef
+1,     409600,     409600,     4096,    16384, 0xbbe55aac
+1,     413696,     413696,     4096,    16384, 0xeb0674a7
+1,     417792,     417792,     4096,    16384, 0x01afba1b
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+1,     430080,     430080,     4096,    16384, 0x6cd1bea2
+1,     434176,     434176,     4096,    16384, 0x97e47cbb
+1,     438272,     438272,     4096,    16384, 0xbb6bf554
+1,     442368,     442368,     4096,    16384, 0x33ea7961
+1,     446464,     446464,     4096,    16384, 0x83ce2f2a
+1,     450560,     450560,     4096,    16384, 0x3bed9e0d
+1,     454656,     454656,     4096,    16384, 0xd3a9570a
+1,     458752,     458752,     4096,    16384, 0x4d5e1aca
+1,     462848,     462848,     4096,    16384, 0x874a9b11
+1,     466944,     466944,     4096,    16384, 0xe51061d8
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+1,     487424,     487424,     4096,    16384, 0x0a82b244
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