#658: auto-select yuv420p for RGB inputs with libx264 -------------------------------------+------------------------------------- Reporter: llogan | Owner: Type: | Status: new enhancement | Component: Priority: wish | undetermined Version: git- | Keywords: master | Blocking: Blocked By: | Analyzed by developer: 0 Reproduced by developer: 0 | -------------------------------------+------------------------------------- I've noticed an increasing number of users wondering why their outputs are not playing normally in some video players, and/or why some profiles won't work ("main profile doesn't support 4:4:4" for example). The general answer is to tell them to use "-pix_fmt yuv420p". x264 technically supports RGB, but I think the vast majority of users will want YUV, although they may not know it. We closed a few similar reports as invalid (#585 and #601) because the current behavior isn't wrong, but it is inconsistent, but now that I see more questions about this I think the default behavior should be changed. Current behavior: {{{ $ ffmpeg -t 5 -loop 1 -i rgb24.png -vcodec libx264 -preset medium -crf 24 -y output.mp4 ffmpeg version N-34884-g7575980, Copyright (c) 2000-2011 the FFmpeg developers built on Nov 15 2011 11:51:13 with gcc 4.6.2 configuration: --prefix=/usr --enable-gpl --enable-libx264 libavutil 51. 25. 0 / 51. 25. 0 libavcodec 53. 34. 0 / 53. 34. 0 libavformat 53. 20. 0 / 53. 20. 0 libavdevice 53. 4. 0 / 53. 4. 0 libavfilter 2. 48. 1 / 2. 48. 1 libswscale 2. 1. 0 / 2. 1. 0 libpostproc 51. 2. 0 / 51. 2. 0 [image2 @ 0x2566880] max_analyze_duration 5000000 reached at 5000000 Input #0, image2, from 'rgb24.png': Duration: 00:00:00.04, start: 0.000000, bitrate: N/A Stream #0:0: Video: png, rgb24, 1000x1000, 25 fps, 25 tbr, 25 tbn, 25 tbc [buffer @ 0x2566800] w:1000 h:1000 pixfmt:rgb24 tb:1/1000000 sar:0/1 sws_param: [libx264 @ 0x256fe80] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 [libx264 @ 0x256fe80] profile High 4:4:4 Predictive, level 3.2, 4:4:4 8-bit [libx264 @ 0x256fe80] 264 - core 119 r2106 07efeb4 - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=24.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 Output #0, mp4, to 'output.mp4': Metadata: encoder : Lavf53.20.0 Stream #0:0: Video: h264 (![0][0][0] / 0x0021), rgb24, 1000x1000, q=-1 --1, 25 tbn, 25 tbc Stream mapping: Stream #0:0 -> #0:0 (png -> libx264) Press [q] to stop, [?] for help frame= 125 fps= 96 q=-1.0 Lsize= 30kB time=00:00:04.92 bitrate= 49.2kbits/s video:27kB audio:0kB global headers:0kB muxing overhead 10.153522% [libx264 @ 0x256fe80] frame I:1 Avg QP:18.84 size: 18603 [libx264 @ 0x256fe80] frame P:31 Avg QP:31.06 size: 117 [libx264 @ 0x256fe80] frame B:93 Avg QP:31.85 size: 49 [libx264 @ 0x256fe80] consecutive B-frames: 0.8% 0.0% 0.0% 99.2% [libx264 @ 0x256fe80] mb I I16..4: 88.5% 5.3% 6.2% [libx264 @ 0x256fe80] mb P I16..4: 1.8% 0.0% 0.0% P16..4: 0.1% 0.0% 0.0% 0.0% 0.0% skip:98.1% [libx264 @ 0x256fe80] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 0.3% 0.0% 0.0% direct: 0.0% skip:99.7% L0:66.9% L1:33.1% BI: 0.0% [libx264 @ 0x256fe80] 8x8 transform intra:3.8% inter:36.5% [libx264 @ 0x256fe80] coded y,u,v intra: 2.3% 2.2% 2.3% inter: 0.0% 0.0% 0.0% [libx264 @ 0x256fe80] i16 v,h,dc,p: 77% 23% 0% 0% [libx264 @ 0x256fe80] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 54% 3% 43% 0% 0% 0% 0% 0% 0% [libx264 @ 0x256fe80] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 44% 27% 18% 2% 2% 2% 2% 2% 1% [libx264 @ 0x256fe80] Weighted P-Frames: Y:0.0% UV:0.0% [libx264 @ 0x256fe80] ref P L0: 51.7% 7.9% 37.1% 3.4% [libx264 @ 0x256fe80] ref B L0: 32.4% 65.3% 2.3% [libx264 @ 0x256fe80] ref B L1: 98.3% 1.7% [libx264 @ 0x256fe80] kb/s:42.84 }}} Re-encoding the output with same settings. Note auto-selecting format 'yuv420p': {{{ $ ffmpeg -i output.mp4 -vcodec libx264 -preset medium -crf 24 -y out2.mp4 ffmpeg version N-34884-g7575980, Copyright (c) 2000-2011 the FFmpeg developers built on Nov 15 2011 11:51:13 with gcc 4.6.2 configuration: --prefix=/usr --enable-gpl --enable-libx264 libavutil 51. 25. 0 / 51. 25. 0 libavcodec 53. 34. 0 / 53. 34. 0 libavformat 53. 20. 0 / 53. 20. 0 libavdevice 53. 4. 0 / 53. 4. 0 libavfilter 2. 48. 1 / 2. 48. 1 libswscale 2. 1. 0 / 2. 1. 0 libpostproc 51. 2. 0 / 51. 2. 0 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 creation_time : 1970-01-01 00:00:00 encoder : Lavf53.20.0 Duration: 00:00:05.00, start: 0.000000, bitrate: 48 kb/s Stream #0:0(und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), gbr24p, 1000x1000, 43 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc Metadata: creation_time : 1970-01-01 00:00:00 handler_name : Incompatible pixel format 'gbr24p' for codec 'libx264', auto-selecting format 'yuv420p' [buffer @ 0x1cf1280] w:1000 h:1000 pixfmt:gbr24p tb:1/1000000 sar:0/1 sws_param: [buffersink @ 0x1cf1680] auto-inserting filter 'auto-inserted scale 0' between the filter 'src' and the filter 'out' [scale @ 0x1cf1b60] w:1000 h:1000 fmt:gbr24p -> w:1000 h:1000 fmt:yuv420p flags:0x4 [libx264 @ 0x1cfd920] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 [libx264 @ 0x1cfd920] profile High, level 3.2 [libx264 @ 0x1cfd920] 264 - core 119 r2106 07efeb4 - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=24.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 Output #0, mp4, to 'out2.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 creation_time : 1970-01-01 00:00:00 encoder : Lavf53.20.0 Stream #0:0(und): Video: h264 (![0][0][0] / 0x0021), yuv420p, 1000x1000, q=-1--1, 25 tbn, 25 tbc Metadata: creation_time : 1970-01-01 00:00:00 handler_name : Stream mapping: Stream #0:0 -> #0:0 (h264 -> libx264) Press [q] to stop, [?] for help frame= 125 fps= 85 q=-1.0 Lsize= 21kB time=00:00:04.92 bitrate= 35.3kbits/s video:18kB audio:0kB global headers:0kB muxing overhead 14.750026% [libx264 @ 0x1cfd920] frame I:1 Avg QP:16.37 size: 12481 [libx264 @ 0x1cfd920] frame P:32 Avg QP:25.74 size: 65 [libx264 @ 0x1cfd920] frame B:92 Avg QP:28.95 size: 40 [libx264 @ 0x1cfd920] consecutive B-frames: 1.6% 0.0% 2.4% 96.0% [libx264 @ 0x1cfd920] mb I I16..4: 93.1% 0.1% 6.9% [libx264 @ 0x1cfd920] mb P I16..4: 0.1% 0.0% 0.0% P16..4: 0.1% 0.0% 0.0% 0.0% 0.0% skip:99.8% [libx264 @ 0x1cfd920] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 0.0% 0.0% 0.0% direct: 0.0% skip:100.0% L0:36.1% L1:63.9% BI: 0.0% [libx264 @ 0x1cfd920] 8x8 transform intra:0.0% inter:57.9% [libx264 @ 0x1cfd920] coded y,uvDC,uvAC intra: 4.8% 10.6% 8.5% inter: 0.0% 0.0% 0.0% [libx264 @ 0x1cfd920] i16 v,h,dc,p: 84% 15% 2% 0% [libx264 @ 0x1cfd920] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 75% 12% 12% 0% 0% 0% 0% 0% 0% [libx264 @ 0x1cfd920] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 44% 28% 19% 2% 1% 2% 2% 1% 1% [libx264 @ 0x1cfd920] i8c dc,h,v,p: 62% 21% 17% 1% [libx264 @ 0x1cfd920] Weighted P-Frames: Y:0.0% UV:0.0% [libx264 @ 0x1cfd920] ref P L0: 66.7% 1.7% 25.8% 5.8% [libx264 @ 0x1cfd920] ref B L0: 78.6% 14.3% 7.1% [libx264 @ 0x1cfd920] ref B L1: 94.9% 5.1% [libx264 @ 0x1cfd920] kb/s:29.14 }}} Also, default behavior of x264 is to choose yuv420p: {{{ $ x264 rgb24.png -o output.h264 Using network protocols without global network initialization. Please use avformat_network_init(), this will become mandatory later. Using network protocols without global network initialization. Please use avformat_network_init(), this will become mandatory later. lavf [info]: 1000x1000p 0:1 @ 25/1 fps (vfr) resize [warning]: converting from rgb24 to yuv420p x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 x264 [info]: profile High, level 3.2 [swscaler @ 0x2f16820] Warning: data is not aligned! This can lead to a speedloss x264 [info]: frame I:1 Avg QP:25.53 size: 7473 x264 [info]: mb I I16..4: 88.8% 5.4% 5.8% x264 [info]: 8x8 transform intra:5.4% x264 [info]: coded y,uvDC,uvAC intra: 3.6% 8.4% 2.7% x264 [info]: i16 v,h,dc,p: 79% 19% 2% 0% x264 [info]: i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 2% 0% 98% 0% 0% 0% 0% 0% 0% x264 [info]: i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 43% 27% 20% 1% 2% 2% 2% 2% 2% x264 [info]: i8c dc,h,v,p: 78% 9% 12% 1% x264 [info]: kb/s:1494.60 encoded 1 frames, 25.58 fps, 1494.60 kb/s }}} -- Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/658> FFmpeg <http://ffmpeg.org> FFmpeg issue tracker