#3947(undetermined:new): Inconsistent and confusing setting of refs with libx264
#3947: Inconsistent and confusing setting of refs with libx264 -------------------------------------+------------------------------------- Reporter: | Type: defect francois.visagie@… | Priority: normal Status: new | Version: git- Component: | master undetermined | Blocked By: Keywords: libx264 | Reproduced by developer: 0 level refs | Blocking: | Analyzed by developer: 0 | -------------------------------------+------------------------------------- Summary of the bug: 1. '-x264opts level=x.y' is documented but does not set refs correctly 2. '-level x.y' sets refs correctly but is not documented How to reproduce: Default behaviour: {{{ ffmpeg -i _640.360.25.avi -preset veryslow output.default.mp4 ffmpeg version N-66232-g5e3da25 Copyright (c) 2000-2014 the FFmpeg developers built on Sep 10 2014 22:01:59 with gcc 4.8.3 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable- libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable- libilbc --enable-lib modplug --enable-libmp3lame --enable-libopencore-amrnb --enable- libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinge r --enable-libsoxr --enable-libspeex --enable-libtheora --enable- libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo- amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-decklink --enable-zlib libavutil 54. 7.100 / 54. 7.100 libavcodec 56. 1.100 / 56. 1.100 libavformat 56. 4.101 / 56. 4.101 libavdevice 56. 0.100 / 56. 0.100 libavfilter 5. 1.100 / 5. 1.100 libswscale 3. 0.100 / 3. 0.100 libswresample 1. 1.100 / 1. 1.100 libpostproc 53. 0.100 / 53. 0.100 Guessed Channel Layout for Input Stream #0.1 : stereo Input #0, avi, from '_640.360.25.avi': Duration: 00:00:10.00, start: 0.000000, bitrate: 7561 kb/s Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 6031 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, 2 channels, s16, 1536 kb/s [libx264 @ 0364f380] using SAR=1/1 [libx264 @ 0364f380] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX [libx264 @ 0364f380] profile High, level 3.1 [libx264 @ 0364f380] 264 - core 142 r2479 dd79a61 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=16 de block=1:0:0 analyse=0x3:0x133 me=umh subme=10 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=24 chroma_me=1 trellis=2 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 ch roma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=8 b_pyramid=2 b_adapt= 2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=60 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmi n=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 Output #0, mp4, to 'output.default.mp4': Metadata: encoder : Lavf56.4.101 Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 640x360 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc Metadata: encoder : Lavc56.1.100 libx264 Stream #0:1: Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, s16, 128 kb/s Metadata: encoder : Lavc56.1.100 libvo_aacenc Stream mapping: Stream #0:0 -> #0:0 (mpeg4 (native) -> h264 (libx264)) Stream #0:1 -> #0:1 (pcm_s16le (native) -> aac (libvo_aacenc)) Press [q] to stop, [?] for help frame= 251 fps= 15 q=-1.0 Lsize= 1184kB time=00:00:10.01 bitrate= 968.6kbits/s dup=1 drop=0 video:1019kB audio:157kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.723548% [libx264 @ 0364f380] frame I:2 Avg QP:25.09 size: 36162 [libx264 @ 0364f380] frame P:60 Avg QP:24.47 size: 12750 [libx264 @ 0364f380] frame B:189 Avg QP:31.31 size: 1085 [libx264 @ 0364f380] consecutive B-frames: 0.8% 6.4% 12.0% 33.5% 13.9% 33.5% 0.0% 0.0% 0.0% [libx264 @ 0364f380] mb I I16..4: 4.0% 77.1% 18.9% [libx264 @ 0364f380] mb P I16..4: 0.4% 1.3% 0.4% P16..4: 36.6% 20.6% 30.7% 3.7% 1.5% skip: 4.8% [libx264 @ 0364f380] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 47.7% 4.8% 1.7% direct: 1.3% skip:44.4% L0:41.8% L1:40.5% BI:17.7% [libx264 @ 0364f380] 8x8 transform intra:70.9% inter:53.0% [libx264 @ 0364f380] direct mvs spatial:97.4% temporal:2.6% [libx264 @ 0364f380] coded y,uvDC,uvAC intra: 81.8% 78.8% 40.8% inter: 14.5% 11.3% 2.0% [libx264 @ 0364f380] i16 v,h,dc,p: 41% 17% 28% 14% [libx264 @ 0364f380] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 10% 18% 8% 10% 10% 9% 9% 11% [libx264 @ 0364f380] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 6% 6% 10% 13% 13% 12% 12% 13% [libx264 @ 0364f380] i8c dc,h,v,p: 28% 28% 31% 13% [libx264 @ 0364f380] Weighted P-Frames: Y:18.3% UV:10.0% [libx264 @ 0364f380] ref P L0: 58.5% 17.3% 8.4% 4.3% 1.8% 2.6% 1.3% 1.3% 0.7% 0.9% 0.5% 0.5% 0.5% 0.5% 0.4% 0.5% [libx264 @ 0364f380] ref B L0: 91.8% 3.9% 2.0% 0.5% 0.5% 0.3% 0.2% 0.1% 0.2% 0.1% 0.1% 0.1% 0.1% 0.1% 0.0% [libx264 @ 0364f380] ref B L1: 95.5% 4.5% [libx264 @ 0364f380] kb/s:830.51 }}} {{{ Expected default refs value: 16 Actual refs value: 16 }}} Documented '-x264opts level=x.y' option: {{{ ffmpeg -i _640.360.25.avi -preset veryslow -x264opts level=3.0 output.-- level3.0.mp4 ffmpeg version N-66232-g5e3da25 Copyright (c) 2000-2014 the FFmpeg developers built on Sep 10 2014 22:01:59 with gcc 4.8.3 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable- libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable- libilbc --enable-lib modplug --enable-libmp3lame --enable-libopencore-amrnb --enable- libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinge r --enable-libsoxr --enable-libspeex --enable-libtheora --enable- libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo- amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-decklink --enable-zlib libavutil 54. 7.100 / 54. 7.100 libavcodec 56. 1.100 / 56. 1.100 libavformat 56. 4.101 / 56. 4.101 libavdevice 56. 0.100 / 56. 0.100 libavfilter 5. 1.100 / 5. 1.100 libswscale 3. 0.100 / 3. 0.100 libswresample 1. 1.100 / 1. 1.100 libpostproc 53. 0.100 / 53. 0.100 Guessed Channel Layout for Input Stream #0.1 : stereo Input #0, avi, from '_640.360.25.avi': Duration: 00:00:10.00, start: 0.000000, bitrate: 7561 kb/s Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 6031 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, 2 channels, s16, 1536 kb/s [libx264 @ 0429e880] using SAR=1/1 [libx264 @ 0429e880] DPB size (16 frames, 14720 mbs) > level limit (8 frames, 8100 mbs) [libx264 @ 0429e880] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX [libx264 @ 0429e880] profile High, level 3.0 [libx264 @ 0429e880] 264 - core 142 r2479 dd79a61 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=16 de block=1:0:0 analyse=0x3:0x133 me=umh subme=10 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=24 chroma_me=1 trellis=2 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 ch roma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=8 b_pyramid=2 b_adapt= 2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=60 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmi n=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 Output #0, mp4, to 'output.--level3.0.mp4': Metadata: encoder : Lavf56.4.101 Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 640x360 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc Metadata: encoder : Lavc56.1.100 libx264 Stream #0:1: Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, s16, 128 kb/s Metadata: encoder : Lavc56.1.100 libvo_aacenc Stream mapping: Stream #0:0 -> #0:0 (mpeg4 (native) -> h264 (libx264)) Stream #0:1 -> #0:1 (pcm_s16le (native) -> aac (libvo_aacenc)) Press [q] to stop, [?] for help frame= 251 fps= 15 q=-1.0 Lsize= 1184kB time=00:00:10.01 bitrate= 968.7kbits/s dup=1 drop=0 video:1019kB audio:157kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.723486% [libx264 @ 0429e880] frame I:2 Avg QP:25.09 size: 36162 [libx264 @ 0429e880] frame P:60 Avg QP:24.47 size: 12748 [libx264 @ 0429e880] frame B:189 Avg QP:31.30 size: 1085 [libx264 @ 0429e880] consecutive B-frames: 0.8% 6.4% 12.0% 33.5% 13.9% 33.5% 0.0% 0.0% 0.0% [libx264 @ 0429e880] mb I I16..4: 4.0% 77.1% 18.9% [libx264 @ 0429e880] mb P I16..4: 0.4% 1.3% 0.4% P16..4: 36.6% 20.6% 30.7% 3.7% 1.5% skip: 4.9% [libx264 @ 0429e880] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 47.7% 4.8% 1.7% direct: 1.3% skip:44.4% L0:41.8% L1:40.5% BI:17.7% [libx264 @ 0429e880] 8x8 transform intra:70.9% inter:53.0% [libx264 @ 0429e880] direct mvs spatial:97.4% temporal:2.6% [libx264 @ 0429e880] coded y,uvDC,uvAC intra: 81.8% 78.9% 40.8% inter: 14.5% 11.3% 2.0% [libx264 @ 0429e880] i16 v,h,dc,p: 41% 17% 28% 14% [libx264 @ 0429e880] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 10% 18% 8% 10% 10% 9% 9% 11% [libx264 @ 0429e880] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 6% 6% 10% 13% 12% 12% 12% 13% [libx264 @ 0429e880] i8c dc,h,v,p: 28% 28% 31% 13% [libx264 @ 0429e880] Weighted P-Frames: Y:18.3% UV:10.0% [libx264 @ 0429e880] ref P L0: 58.5% 17.3% 8.4% 4.3% 1.8% 2.6% 1.3% 1.3% 0.7% 0.9% 0.5% 0.6% 0.5% 0.5% 0.4% 0.5% [libx264 @ 0429e880] ref B L0: 91.8% 3.9% 2.0% 0.6% 0.5% 0.3% 0.2% 0.1% 0.2% 0.1% 0.1% 0.1% 0.1% 0.1% 0.0% [libx264 @ 0429e880] ref B L1: 95.5% 4.5% [libx264 @ 0429e880] kb/s:830.59 }}} {{{ Expected refs value: 8 Actual refs value: 16 }}} Undocumented '-level x.y' option: {{{ ffmpeg -i _640.360.25.avi -preset veryslow -level 3.0 output.-level3.0.mp4 ffmpeg version N-66232-g5e3da25 Copyright (c) 2000-2014 the FFmpeg developers built on Sep 10 2014 22:01:59 with gcc 4.8.3 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable- libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable- libilbc --enable-lib modplug --enable-libmp3lame --enable-libopencore-amrnb --enable- libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinge r --enable-libsoxr --enable-libspeex --enable-libtheora --enable- libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo- amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-decklink --enable-zlib libavutil 54. 7.100 / 54. 7.100 libavcodec 56. 1.100 / 56. 1.100 libavformat 56. 4.101 / 56. 4.101 libavdevice 56. 0.100 / 56. 0.100 libavfilter 5. 1.100 / 5. 1.100 libswscale 3. 0.100 / 3. 0.100 libswresample 1. 1.100 / 1. 1.100 libpostproc 53. 0.100 / 53. 0.100 Guessed Channel Layout for Input Stream #0.1 : stereo Input #0, avi, from '_640.360.25.avi': Duration: 00:00:10.00, start: 0.000000, bitrate: 7561 kb/s Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 6031 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, 2 channels, s16, 1536 kb/s [libx264 @ 041af7e0] using SAR=1/1 [libx264 @ 041af7e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX [libx264 @ 041af7e0] profile High, level 3.0 [libx264 @ 041af7e0] 264 - core 142 r2479 dd79a61 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=8 deb lock=1:0:0 analyse=0x3:0x133 me=umh subme=10 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=24 chroma_me=1 trellis=2 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chr oma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=8 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=60 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin =0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 Output #0, mp4, to 'output.-level3.0.mp4': Metadata: encoder : Lavf56.4.101 Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 640x360 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc Metadata: encoder : Lavc56.1.100 libx264 Stream #0:1: Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, s16, 128 kb/s Metadata: encoder : Lavc56.1.100 libvo_aacenc Stream mapping: Stream #0:0 -> #0:0 (mpeg4 (native) -> h264 (libx264)) Stream #0:1 -> #0:1 (pcm_s16le (native) -> aac (libvo_aacenc)) Press [q] to stop, [?] for help frame= 251 fps= 20 q=-1.0 Lsize= 1189kB time=00:00:10.01 bitrate= 972.8kbits/s dup=1 drop=0 video:1024kB audio:157kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.720318% [libx264 @ 041af7e0] frame I:2 Avg QP:25.09 size: 36162 [libx264 @ 041af7e0] frame P:60 Avg QP:24.47 size: 12846 [libx264 @ 041af7e0] frame B:189 Avg QP:31.33 size: 1082 [libx264 @ 041af7e0] consecutive B-frames: 0.8% 6.4% 12.0% 33.5% 13.9% 33.5% 0.0% 0.0% 0.0% [libx264 @ 041af7e0] mb I I16..4: 4.0% 77.1% 18.9% [libx264 @ 041af7e0] mb P I16..4: 0.5% 1.2% 0.4% P16..4: 36.3% 20.6% 30.8% 3.8% 1.6% skip: 4.8% [libx264 @ 041af7e0] mb B I16..4: 0.0% 0.1% 0.0% B16..8: 48.1% 4.7% 1.5% direct: 1.3% skip:44.3% L0:41.3% L1:40.7% BI:18.0% [libx264 @ 041af7e0] 8x8 transform intra:68.7% inter:52.3% [libx264 @ 041af7e0] direct mvs spatial:97.4% temporal:2.6% [libx264 @ 041af7e0] coded y,uvDC,uvAC intra: 80.8% 78.4% 39.7% inter: 14.6% 11.3% 2.0% [libx264 @ 041af7e0] i16 v,h,dc,p: 43% 17% 25% 15% [libx264 @ 041af7e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 10% 18% 8% 10% 10% 10% 9% 11% [libx264 @ 041af7e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 6% 6% 10% 12% 13% 11% 12% 13% [libx264 @ 041af7e0] i8c dc,h,v,p: 29% 27% 31% 14% [libx264 @ 041af7e0] Weighted P-Frames: Y:18.3% UV:10.0% [libx264 @ 041af7e0] ref P L0: 59.9% 17.9% 8.6% 4.8% 2.1% 3.1% 1.5% 1.9% 0.2% 0.0% [libx264 @ 041af7e0] ref B L0: 92.3% 4.0% 2.1% 0.5% 0.6% 0.3% 0.1% [libx264 @ 041af7e0] ref B L1: 95.5% 4.5% [libx264 @ 041af7e0] kb/s:834.70 }}} {{{ Expected refs value: 8 Actual refs value: 8 }}} Arguably the most consistent fix would be to correct '-x264opts level=x.y' to behave like '-level x.y', and for '-level x.y' to also be documented. -- Ticket URL: <https://trac.ffmpeg.org/ticket/3947> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
#3947: Inconsistent and confusing setting of refs with libx264 -------------------------------------+------------------------------------- Reporter: | Owner: francois.visagie@… | Status: open Type: defect | Component: avcodec Priority: normal | Resolution: Version: git-master | Blocked By: Keywords: libx264 | Reproduced by developer: 1 Blocking: | Analyzed by developer: 0 | -------------------------------------+------------------------------------- Changes (by Timothy_Gu): * keywords: libx264 level refs => libx264 * status: new => open * component: undetermined => avcodec * reproduced: 0 => 1 Comment: To adjust level through `-x264opts`, we will have to make a special case as x264 requires some further configuration else than just setting the level in the context. Or it could be fixed on the x264 side. On the other hand, `-level` documentation should be fixed. -- Ticket URL: <https://trac.ffmpeg.org/ticket/3947#comment:1> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
#3947: Inconsistent and confusing setting of refs with libx264 -------------------------------------+------------------------------------- Reporter: | Owner: francois.visagie@… | Status: open Type: defect | Component: avcodec Priority: normal | Resolution: Version: git-master | Blocked By: Keywords: libx264 | Reproduced by developer: 1 Blocking: | Analyzed by developer: 0 | -------------------------------------+------------------------------------- Comment (by francois.visagie@…): Replying to [comment:1 Timothy_Gu]:
To adjust level through `-x264opts`, we will have to make a special case as x264 requires some further configuration else than just setting the level in the context. Or it could be fixed on the x264 side.
Since '-level x.y' seems to correctly set that configuration - including refs - is there the possibility that the handling of '-x264opts level=x.y' could be directed to that of '-level x.y'? In any case, while I'm not able to analyse the code, for three reasons there does seem to be the possibility that the further configuration is correctly set by '-x264opts level', but (accidentally) partially overwritten by ffmpeg subsequently. 1) 'x264 --level' correctly sets the level-specific configuration, including refs, which creates the possibility that libx264 might do the same. 2) When not given a '-refs' value, ffmpeg always defaults to 16. 3) All encodes done with '-x264opts level' and without '-refs' have refs=16. Together these give rise to the possibility that when '-x264opts level' is used, libx264 correctly sets the configuration, but that ffmpeg subsequently overwrites refs with its default of 16. If that is the case, ffmpeg's logic could be changed to not pass a refs value to libx264 when either of '-level' or '-x264opts level' is used, and no '-refs' value is provided. If that is not the case but ffmpeg somehow needs to anticipate the level and/or level-specific maxrefs level libx264 will need, you could refer to the calculations in attachment [http://trac.ffmpeg.org/attachment/ticket/3947/h264levl.bat].
On the other hand, `-level` documentation should be fixed.
Please. At the moment it only says {{{ level integer (encoding,audio,video) Possible values: ‘unknown’ }}} Apart from missing possible values etc., it should mention whether this option takes into account x264's handling of refs wrt. bframes and b-pyramid [http://forum.doom9.org/showthread.php?t=142758]. -- Ticket URL: <https://trac.ffmpeg.org/ticket/3947#comment:2> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
#3947: Inconsistent and confusing setting of refs with libx264 -------------------------------------+------------------------------------- Reporter: | Owner: francois.visagie@… | Status: open Type: defect | Component: avcodec Priority: normal | Resolution: Version: git-master | Blocked By: Keywords: libx264 | Reproduced by developer: 1 Blocking: | Analyzed by developer: 0 | -------------------------------------+------------------------------------- Comment (by cehoyos): Isn't this just a documentation issue? -- Ticket URL: <https://trac.ffmpeg.org/ticket/3947#comment:3> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
#3947: Inconsistent and confusing setting of refs with libx264 -------------------------------------+------------------------------------- Reporter: | Owner: francois.visagie@… | Status: open Type: defect | Component: avcodec Priority: normal | Resolution: Version: git-master | Blocked By: Keywords: libx264 | Reproduced by developer: 1 Blocking: | Analyzed by developer: 0 | -------------------------------------+------------------------------------- Comment (by francois.visagie@…): In my view it is at least a documentation issue which I would appreciate fixed. If any of the ffmpeg developers see fit to also improve behaviour around maxrefs management, that is their prerogative. For updating documentation, may I request that it also address whether this option takes into account x264's handling of refs wrt. bframes and b-pyramid [http://forum.doom9.org/showthread.php?t=142758]? -- Ticket URL: <https://trac.ffmpeg.org/ticket/3947#comment:4> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
#3947: Inconsistent and confusing setting of refs with libx264 -------------------------------------+------------------------------------- Reporter: | Owner: francois.visagie@… | Status: open Type: defect | Component: Priority: minor | documentation Version: git-master | Resolution: Keywords: libx264 | Blocked By: Blocking: | Reproduced by developer: 1 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Changes (by cehoyos): * priority: normal => minor * component: avcodec => documentation -- Ticket URL: <https://trac.ffmpeg.org/ticket/3947#comment:5> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
#3947: Inconsistent and confusing setting of refs with libx264 -------------------------------------+------------------------------------- Reporter: | Owner: francois.visagie@… | Status: open Type: defect | Component: Priority: minor | documentation Version: git-master | Resolution: Keywords: libx264 | Blocked By: Blocking: | Reproduced by developer: 1 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Comment (by francois.visagie@…): Unfortunately I can confirm that there is also a software bug, in addition to a documentation error. Let's restate the information from [https://trac.ffmpeg.org/ticket/3947#comment:2 comment 2]: 1. When '-x264opts level=x.y' is used, ffmpeg does not correctly set reference frames for the specified level (shown in original report above). 2. However, when --level is used with x264, it DOES correctly set reference frames for the specified level: {{{ C:\Users\fvisagie\Videos\Home Videos\Testing\x264>h264levl 720 576 25 1500000 h264levl v1.1 (c) F. Visagie 2014/10/31 level=3 maxref=5 x264maxref=5 }}} {{{ C:\Users\fvisagie\Videos\Home Videos\Testing\x264>x264 --preset veryslow --bitrate 1500 --level 3 -o zzz.m4v inprogressive.mpg [mpeg @ 003e29c0] max_analyze_duration 5000000 reached lavf [info]: 720x576p 64:45 @ 25/1 fps (vfr) x264 [info]: using SAR=64/45 x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX x264 [info]: profile High, level 3.0 x264 [info]: frame I:15 Avg QP:25.41 size: 45805 x264 [info]: frame P:473 Avg QP:30.64 size: 12431 x264 [info]: frame B:1012 Avg QP:34.26 size: 4176 x264 [info]: consecutive B-frames: 3.9% 4.1% 64.0% 4.5% 5.0% 18.4% 0.0% 0.0% 0.0% x264 [info]: mb I I16..4: 3.6% 87.1% 9.3% x264 [info]: mb P I16..4: 3.2% 19.9% 1.6% P16..4: 41.2% 15.1% 8.9% 0.2% 0.0% skip: 9.9% x264 [info]: mb B I16..4: 0.6% 3.0% 0.2% B16..8: 42.4% 10.0% 2.0% direct: 3.1% skip:38.8% L0:38.0% L1:51.3% BI:10.7% x264 [info]: final ratefactor: 25.75 x264 [info]: 8x8 transform intra:81.2% inter:82.2% x264 [info]: direct mvs spatial:99.6% temporal:0.4% x264 [info]: coded y,uvDC,uvAC intra: 69.5% 64.3% 22.2% inter: 19.9% 13.5% 1.2% x264 [info]: i16 v,h,dc,p: 29% 26% 8% 36% x264 [info]: i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 10% 5% 7% 11% 15% 12% 12% 12% x264 [info]: i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 10% 4% 7% 12% 16% 11% 10% 9% x264 [info]: i8c dc,h,v,p: 34% 24% 23% 19% x264 [info]: Weighted P-Frames: Y:1.1% UV:0.4% x264 [info]: ref P L0: 58.5% 20.4% 12.8% 3.2% 3.0% 2.0% 0.1% x264 [info]: ref B L0: 90.1% 6.9% 2.2% 0.8% x264 [info]: ref B L1: 96.2% 3.8% x264 [info]: kb/s:1441.07 encoded 1500 frames, 11.38 fps, 1441.07 kb/s }}} Unfortunately I do not know how to show encoder settings or number of reference frames in the output file with ffprobe. MediaInfo output: {{{ General Complete name : C:\Users\fvisagie\Videos\Home Videos\Testing\x264\zzz.m4v Format : AVC Format/Info : Advanced Video Codec File size : 10.3 MiB Video Format : AVC Format/Info : Advanced Video Codec Format profile : High@L3.0 Format settings, CABAC : Yes Format settings, ReFrames : 5 frames Bit rate : 1 500 Kbps Width : 720 pixels Height : 576 pixels Display aspect ratio : 16:9 Frame rate mode : Variable Standard : PAL Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Writing library : x264 core 142 r2479 dd79a61 Encoding settings : cabac=1 / ref=5 / deblock=1:0:0 / analyse=0x3:0x133 / me=umh / subme=10 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=24 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=6 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=8 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=60 / rc=abr / mbtree=1 / bitrate=1500 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00 }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/3947#comment:6> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
#3947: Inconsistent and confusing setting of refs with libx264 -------------------------------------+------------------------------------- Reporter: | Owner: francois.visagie@… | Status: open Type: defect | Component: avcodec Priority: normal | Resolution: Version: git-master | Blocked By: Keywords: libx264 | Reproduced by developer: 1 Blocking: | Analyzed by developer: 0 | -------------------------------------+------------------------------------- Changes (by francois.visagie@…): * priority: minor => normal * component: documentation => avcodec -- Ticket URL: <https://trac.ffmpeg.org/ticket/3947#comment:7> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
#3947: Inconsistent and confusing setting of refs with libx264 -------------------------------------+------------------------------------- Reporter: | Owner: francois.visagie@… | Status: open Type: defect | Component: Priority: minor | documentation Version: git-master | Resolution: Keywords: libx264 | Blocked By: Blocking: | Reproduced by developer: 1 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Changes (by cehoyos): * priority: normal => minor * component: avcodec => documentation -- Ticket URL: <https://trac.ffmpeg.org/ticket/3947#comment:8> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
#3947: Inconsistent and confusing setting of refs with libx264 -------------------------------------+------------------------------------- Reporter: | Owner: francois.visagie@… | Status: open Type: defect | Component: Priority: minor | documentation Version: git-master | Resolution: Keywords: libx264 | Blocked By: Blocking: | Reproduced by developer: 1 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Comment (by francois.visagie@…): Replying to [comment:8 cehoyos]: Can you explain how - given that comment 1 indicated this in addition to being a documentation issue also to be a code issue related to avcodec, and that comment 6 confirmed that - you believe this solely to be a documentation issue? -- Ticket URL: <https://trac.ffmpeg.org/ticket/3947#comment:9> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
#3947: Inconsistent and confusing setting of refs with libx264 -------------------------------------+------------------------------------- Reporter: Francois | Owner: (none) Visagie | Type: defect | Status: closed Priority: minor | Component: | documentation Version: git-master | Resolution: fixed Keywords: libx264 | Blocked By: Blocking: | Reproduced by developer: 1 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Changes (by Stefano Sabatini): * status: open => closed * resolution: => fixed Comment: This should be fixed in commit: {{{ ommit d0f071dfe743a410ff385c832b9c3ff47fd73c94 Author: Stefano Sabatini <stefasab@gmail.com> Date: Sat Aug 26 02:53:28 2023 +0200 doc/encoders/libx264: clarify meaning of level option In particular, clarify that it can either be set as a field of AVCodecContext or as an x264 option, using a different specification. Should address trac issue: http://trac.ffmpeg.org/ticket/3947 }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/3947#comment:10> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
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