Tengo muchos videos tomados en 1080p usando un Nexus 5 con Android Lollipop. Los he reducido a 720p con ffmpeg v3.1.5 (desde entonces configuré la calidad de grabación de video a 720p antes de que alguien lo señale). Algunos están en orientación vertical. Yo uso el siguiente comando en esos:
ffmpeg -i VID_20150919_121521.mp4 -vf scale=720:-1 VID_20150919_121521-2.mp4
Estoy feliz de dejar que ffmpeg haga lo suyo. Estoy contento con los resultados. Sin embargo, me sorprendió saber que no necesitaba usar la opción de transposición. Como puede ver en el resultado a continuación, parece haber algunos metadatos de rotación. No tengo idea si esto es relevante, solo poniéndolo ahí. Ahora esto funciona técnicamente: el video se escala a 720p y se reproduce en la orientación correcta en VLC, pero no hay una miniatura del explorador de Windows 7 y en los detalles de las propiedades no hay ancho ni altura de cuadros ni información de velocidad de cuadros. Todos mis otros videos de paisaje reducen la escala muy bien y obtengo una imagen en miniatura y de cuadro. ¿Qué está pasando y cómo lo soluciono?
ffmpeg version 3.1.5 Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 5.4.0 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
libavutil 55. 28.100 / 55. 28.100
libavcodec 57. 48.101 / 57. 48.101
libavformat 57. 41.100 / 57. 41.100
libavdevice 57. 0.101 / 57. 0.101
libavfilter 6. 47.100 / 6. 47.100
libswscale 4. 1.100 / 4. 1.100
libswresample 2. 1.100 / 2. 1.100
libpostproc 54. 0.100 / 54. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'VID_20150919_121521.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
creation_time : 2015-09-19 16:15:29
location : +45.4699-075.5184/
location-eng : +45.4699-075.5184/
Duration: 00:00:06.53, start: 0.000000, bitrate: 12568 kb/s
Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1920x1080, 12217 kb/s, SAR 1:1 DAR 16:9, 30.32 fps, 30 tbr, 90k tbn, 180k tbc (default)
Metadata:
rotate : 90
creation_time : 2015-09-19 16:15:29
handler_name : VideoHandle
Side data:
displaymatrix: rotation of -90.00 degrees
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 96 kb/s (default)
Metadata:
creation_time : 2015-09-19 16:15:29
handler_name : SoundHandle
[libx264 @ 0000000002d7fa80] using SAR=1/1
[libx264 @ 0000000002d7fa80] using cpu capabilities: MMX2 SSE2Fast LZCNT
[libx264 @ 0000000002d7fa80] profile High, level 3.1
[libx264 @ 0000000002d7fa80] 264 - core 148 r2721 72d53ab - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - 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=4 lookahead_threads=1 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=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
[mp4 @ 00000000005ef4e0] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
Last message repeated 1 times
Output #0, mp4, to 'VID_20150919_121521-2.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
location-eng : +45.4699-075.5184/
location : +45.4699-075.5184/
encoder : Lavf57.41.100
Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 720x1280 [SAR 1:1 DAR 9:16], q=-1--1, 30 fps, 15360 tbn, 30 tbc (default)
Metadata:
handler_name : VideoHandle
creation_time : 2015-09-19 16:15:29
encoder : Lavc57.48.101 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1(eng): Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, mono, fltp, 69 kb/s (default)
Metadata:
creation_time : 2015-09-19 16:15:29
handler_name : SoundHandle
encoder : Lavc57.48.101 aac
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
frame= 30 fps=0.0 q=0.0 size= 0kB time=00:00:01.06 bitrate= 0.4kbits/s speed=2.13x
frame= 47 fps= 37 q=0.0 size= 0kB time=00:00:02.00 bitrate= 0.2kbits/s speed=1.59x
frame= 55 fps= 31 q=29.0 size= 142kB time=00:00:02.00 bitrate= 580.1kbits/s speed=1.11x
Past duration 0.608986 too large
frame= 63 fps= 26 q=29.0 size= 289kB time=00:00:03.00 bitrate= 788.3kbits/s speed=1.24x
Past duration 0.619331 too large
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Past duration 0.695000 too large
frame= 71 fps= 22 q=29.0 size= 482kB time=00:00:03.00 bitrate=1312.7kbits/s speed=0.951x
Past duration 0.701653 too large
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Past duration 0.764992 too large
Past duration 0.782661 too large
frame= 79 fps= 21 q=29.0 size= 651kB time=00:00:03.00 bitrate=1772.3kbits/s speed=0.797x
Past duration 0.790993 too large
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Past duration 0.857658 too large
frame= 86 fps= 20 q=29.0 size= 786kB time=00:00:03.00 bitrate=2141.7kbits/s speed=0.696x
Past duration 0.865990 too large
Past duration 0.878990 too large
Past duration 0.885658 too large
Past duration 0.898659 too large
Past duration 0.911659 too large
Past duration 0.924660 too large
frame= 92 fps= 19 q=29.0 size= 900kB time=00:00:03.00 bitrate=2452.0kbits/s speed=0.62x
Past duration 0.931999 too large
Past duration 0.939323 too large
Past duration 0.952660 too large
Past duration 0.965996 too large
Past duration 0.979332 too large
Past duration 0.988655 too large
Past duration 0.997993 too large
frame= 100 fps= 18 q=29.0 size= 1055kB time=00:00:04.01 bitrate=2154.8kbits/s speed=0.735x
frame= 107 fps= 18 q=29.0 size= 1186kB time=00:00:04.01 bitrate=2421.8kbits/s speed=0.665x
frame= 115 fps= 17 q=29.0 size= 1325kB time=00:00:04.01 bitrate=2707.1kbits/s speed=0.594x
frame= 123 fps= 17 q=29.0 size= 1458kB time=00:00:04.01 bitrate=2979.0kbits/s speed=0.545x
frame= 130 fps= 17 q=29.0 size= 1587kB time=00:00:05.01 bitrate=2592.5kbits/s speed=0.637x
frame= 135 fps= 16 q=29.0 size= 1676kB time=00:00:05.01 bitrate=2738.8kbits/s speed=0.597x
frame= 143 fps= 16 q=29.0 size= 1828kB time=00:00:05.01 bitrate=2986.4kbits/s speed=0.552x
frame= 150 fps= 16 q=29.0 size= 1963kB time=00:00:05.01 bitrate=3207.7kbits/s speed=0.523x
frame= 156 fps= 15 q=29.0 size= 2055kB time=00:00:06.01 bitrate=2799.0kbits/s speed=0.594x
frame= 163 fps= 15 q=29.0 size= 2208kB time=00:00:06.01 bitrate=3006.9kbits/s speed=0.561x
frame= 171 fps= 15 q=29.0 size= 2373kB time=00:00:06.01 bitrate=3230.9kbits/s speed=0.525x
frame= 179 fps= 15 q=29.0 size= 2518kB time=00:00:06.01 bitrate=3428.5kbits/s speed=0.494x
frame= 185 fps= 15 q=29.0 size= 2631kB time=00:00:06.01 bitrate=3583.0kbits/s speed=0.475x
frame= 191 fps= 14 q=29.0 size= 2738kB time=00:00:06.03 bitrate=3715.2kbits/s speed=0.456x
frame= 194 fps= 12 q=-1.0 Lsize= 3555kB time=00:00:06.52 bitrate=4461.1kbits/s speed=0.398x
video:3490kB audio:56kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.233024%
[libx264 @ 0000000002d7fa80] frame I:3 Avg QP:23.00 size: 34556
[libx264 @ 0000000002d7fa80] frame P:50 Avg QP:25.33 size: 30594
[libx264 @ 0000000002d7fa80] frame B:141 Avg QP:26.77 size: 13760
[libx264 @ 0000000002d7fa80] consecutive B-frames: 1.5% 3.1% 4.6% 90.7%
[libx264 @ 0000000002d7fa80] mb I I16..4: 11.0% 81.3% 7.7%
[libx264 @ 0000000002d7fa80] mb P I16..4: 6.7% 40.0% 3.5% P16..4: 33.6% 10.1% 4.3% 0.0% 0.0% skip: 1.7%
[libx264 @ 0000000002d7fa80] mb B I16..4: 1.3% 4.3% 0.2% B16..8: 45.2% 8.6% 1.3% direct:12.7% skip:26.5% L0:47.3% L1:47.7% BI: 5.0%
[libx264 @ 0000000002d7fa80] 8x8 transform intra:78.6% inter:77.3%
[libx264 @ 0000000002d7fa80] coded y,uvDC,uvAC intra: 61.0% 86.1% 49.6% inter: 28.9% 48.0% 5.4%
[libx264 @ 0000000002d7fa80] i16 v,h,dc,p: 19% 16% 8% 57%
[libx264 @ 0000000002d7fa80] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 17% 21% 6% 7% 7% 8% 7% 10%
[libx264 @ 0000000002d7fa80] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 23% 17% 6% 8% 6% 7% 5% 6%
[libx264 @ 0000000002d7fa80] i8c dc,h,v,p: 57% 18% 18% 7%
[libx264 @ 0000000002d7fa80] Weighted P-Frames: Y:4.0% UV:2.0%
[libx264 @ 0000000002d7fa80] ref P L0: 65.2% 12.5% 16.0% 6.1% 0.1%
[libx264 @ 0000000002d7fa80] ref B L0: 93.7% 5.1% 1.2%
[libx264 @ 0000000002d7fa80] ref B L1: 98.2% 1.8%
[libx264 @ 0000000002d7fa80] kb/s:4420.90
[aac @ 0000000000531400] Qavg: 673.912
Retrato iPhone 4 video, mov a mp4, lo mismo. Que esta pasando?
—
brock
ffmpegrotará automáticamente cuando se vuelva a codificar de acuerdo con losrotatemetadatos (no lo hace al copiar secuencias o al usar la-noautorotateopción). Por qué la miniatura y otra información no se muestra en Explorer es otro problema, probablemente no relacionado.