Subiendo video de FFmpeg a Twitter, la calidad de los primeros segundos es terrible

Estoy usando FFmpeg para crear un video a partir de una pista de audio y una secuencia de imágenes jpeg (es una animación de 5 fps. He probado variaciones de CRF 0, 17 y 23 y he intentado la codificación de 2 pasadas con una tasa de bits de 2600k y el resultado es siempre el mismo. El video está bien en mi computadora portátil. Cuando lo subo a Twitter, el video tiene una calidad terrible para comenzar, incluyendo fallas de video y audio (en el mismo lugar, independientemente de la configuración de CRF) cuando se reproduce en un navegador web. La calidad es mala en la aplicación de Twitter al principio, pero los problemas técnicos no están ahí. El video se ve bien en YouTube cuando lo subo allí.

Cuando veo otros videos cargados directamente en Twitter, se ven bien para todo el video.

¿Tienes idea de lo que está pasando? Creo que debe haber algo en mi configuración que esté causando un problema cuando Twitter vuelve a codificar el archivo.

Estas son mis configuraciones:

./ffmpeg -f image2 -pattern_type glob -framerate 5 -i 'frames / / .jpeg' -i "audio.wav" -filter_complex "[1: 0] apad" -shortest -c: v libx264 -crf 17 -pix_fmt yuv420p -c: a aac -b: a 528k -map_chapters -1 -s 1920x1080 -movflags + faststart "output.mp4"

./ffmpeg -pattern_type glob -framerate 5 -pix_fmt yuv420p -i 'frames/*/*.jpeg' -i audio/audio.wav -filter_complex "[1:0]apad" -shortest -c:a aac -b:a 528k -c:v libx264 -crf 17 -s 1920x1080 -movflags +faststart -r 25 output.mp4
ffmpeg version 3.4-tessus Copyright (c) 2000-2017 the FFmpeg developers
  built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
  configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, image2, from 'frames/*/*.jpeg':
  Duration: 00:01:09.80, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 1920x1080, 5 fps, 5 tbr, 5 tbn, 5 tbc
Guessed Channel Layout for Input Stream #1.0 : stereo
Input #1, wav, from 'audio/audio.wav':
  Metadata:
    encoded_by      : Logic Pro
    date            : 2017-11-27
    creation_time   : 09:21:01
    time_reference  : 158760000
    umid            : 0x00BFF090FFBFF890FFBFF890FFBF0091FFBF0091FFBF0891FFBF0891FFBF1091FFBF1091FFBF1891FFBF1891FFBF2091FFBF2091FFBF2891FFBF2891FFBF3091
    coding_history  : 
  Duration: 00:01:06.92, bitrate: 2119 kb/s
    Stream #1:0: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s32 (24 bit), 2116 kb/s
File 'output.mp4' already exists. Overwrite ? [y/N] y
Stream mapping:
  Stream #1:0 (pcm_s24le) -> apad (graph 0)
  apad (graph 0) -> Stream #0:0 (aac)
  Stream #0:0 -> #0:1 (mjpeg (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[image2 @ 0x7fcf4b809800] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
[libx264 @ 0x7fcf4b818c00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
[libx264 @ 0x7fcf4b818c00] profile High 4:4:4 Predictive, level 4.0, 4:4:4 8-bit
[libx264 @ 0x7fcf4b818c00] 264 - core 148 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - 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=4 threads=6 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=17.0 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         : Lavf57.83.100
    Stream #0:0: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp (24 bit), 528 kb/s
    Metadata:
      encoder         : Lavc57.107.100 aac
    Stream #0:1: Video: h264 (libx264) (avc1 / 0x31637661), yuvj444p(pc), 1920x1080, q=-1--1, 25 fps, 12800 tbn, 25 tbc
    Metadata:
      encoder         : Lavc57.107.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
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bitrate=12288.0kbitsframe=  890 fps=7.7 q=22.0 size=   50176kB time=00:00:33.48 bitrate=12277.2kbitsframe=  900 fps=7.8 q=22.0 size=   50688kB time=00:00:33.88 bitrate=12256.1kbitsframe=  905 fps=7.7 q=22.0 size=   50688kB time=00:00:34.08 bitrate=12184.1kbitsframe=  915 fps=7.7 q=22.0 size=   51200kB time=00:00:34.48 bitrate=12164.4kbitsframe=  920 fps=7.7 q=22.0 size=   51712kB time=00:00:34.68 bitrate=12215.2kbitsframe=  930 fps=7.8 q=22.0 size=   51968kB time=00:00:35.08 bitrate=12135.7kbitsframe=  935 fps=7.8 q=22.0 size=   51968kB time=00:00:35.28 bitrate=12066.9kbitsframe=  940 fps=7.7 q=22.0 size=   52480kB time=00:00:35.48 bitrate=12117.1kbitsframe=  950 fps=7.8 q=22.0 size=   52992kB time=00:00:35.88 bitrate=12098.9kbitsframe=  955 fps=7.8 q=22.0 size=   52992kB time=00:00:36.08 bitrate=12031.9kbitsframe=  960 fps=7.8 q=22.0 size=   53248kB time=00:00:36.28 bitrate=12023.3kbitsframe=  970 fps=7.8 q=22.0 size=   53760kB time=00:00:36.68 bitrate=12006.6kbitsframe=  975 fps=7.8 q=22.0 size=   53760kB time=00:00:36.88 bitrate=11941.5kbitsframe=  985 fps=7.8 q=22.0 size=   54272kB time=00:00:37.28 bitrate=11925.8kbitsframe=  990 fps=7.8 q=22.0 size=   54272kB time=00:00:37.48 bitrate=11862.2kbitsframe=  995 fps=7.8 q=22.0 size=   54784kB time=00:00:37.68 bitrate=11910.6kbitsframe= 1005 fps=7.8 q=22.0 size=   55296kB time=00:00:38.08 bitrate=11895.6kbitsframe= 1010 fps=7.8 q=22.0 size=   55296kB time=00:00:38.28 bitrate=11833.4kbitsframe= 1015 fps=7.8 q=22.0 size=   55552kB time=00:00:38.48 bitrate=11826.4kbitsframe= 1020 fps=7.8 q=22.0 size=   55808kB time=00:00:38.68 bitrate=11819.5kbitsframe= 1030 fps=7.8 q=22.0 size=   56064kB time=00:00:39.08 bitrate=11752.2kbitsframe= 1035 fps=7.8 q=22.0 size=   56576kB time=00:00:39.28 bitrate=11799.1kbitsframe= 1045 fps=7.8 q=22.0 size=   56832kB time=00:00:39.68 bitrate=11733.0kbitsframe= 1050 fps=7.8 q=22.0 size=   56832kB time=00:00:39.88 bitrate=11674.2kbitsframe= 1055 fps=7.8 q=22.0 size=   57344kB time=00:00:40.08 bitrate=11720.6kbitsframe= 1065 fps=7.8 q=22.0 size=   57856kB time=00:00:40.48 bitrate=11708.4kbitsframe= 1075 fps=7.9 q=22.0 size=   57856kB time=00:00:40.88 bitrate=11593.8kbitsframe= 1080 fps=7.9 q=22.0 size=   58368kB time=00:00:41.08 bitrate=11639.5kbitsframe= 1085 fps=7.9 q=22.0 size=   58624kB time=00:00:41.28 bitrate=11633.9kbitsframe= 1095 fps=7.9 q=22.0 size=   59136kB time=00:00:41.68 bitrate=11622.9kbitsframe= 1100 fps=7.9 q=22.0 size=   59392kB time=00:00:41.88 bitrate=11617.4kbitsframe= 1105 fps=7.9 q=22.0 size=   59392kB time=00:00:42.08 bitrate=11562.2kbitsframe= 1115 fps=7.9 q=22.0 size=   59904kB time=00:00:42.48 bitrate=11552.1kbitsframe= 1120 fps=7.9 q=22.0 size=   59904kB time=00:00:42.68 bitrate=11498.0kbitsframe= 1125 fps=7.9 q=22.0 size=   60416kB time=00:00:42.88 bitrate=11542.1kbitsframe= 1135 fps=7.9 q=22.0 size=   60672kB time=00:00:43.28 bitrate=11483.9kbitsframe= 1140 fps=7.9 q=22.0 size=   60672kB time=00:00:43.48 bitrate=11431.1kbitsframe= 1145 fps=7.9 q=22.0 size=   61184kB time=00:00:43.68 bitrate=11474.8kbitsframe= 1160 fps=7.9 q=22.0 size=   61696kB time=00:00:44.28 bitrate=11414.0kbitsframe= 1165 fps=7.9 q=22.0 size=   61952kB time=00:00:44.48 bitrate=11409.9kbitsframe= 1175 fps=7.9 q=22.0 size=   62464kB time=00:00:44.88 bitrate=11401.6kbitsframe= 1185 fps=8.0 q=22.0 size=   62720kB time=00:00:45.28 bitrate=11347.2kbitsframe= 1190 fps=8.0 q=22.0 size=   62976kB time=00:00:45.48 bitrate=11343.4kbitsframe= 1195 fps=8.0 q=22.0 size=   63232kB time=00:00:45.68 bitrate=11339.7kbitsframe= 1205 fps=8.0 q=22.0 size=   63744kB time=00:00:46.08 bitrate=11332.3kbitsframe= 1210 fps=7.9 q=22.0 size=   63744kB time=00:00:46.28 bitrate=11283.3kbitsframe= 1215 fps=7.9 q=22.0 size=   64256kB time=00:00:46.48 bitrate=11325.0kbitsframe= 1220 fps=7.9 q=22.0 size=   64512kB time=00:00:46.68 bitrate=11321.4kbitsframe= 1230 fps=7.9 q=22.0 size=   64512kB time=00:00:47.08 bitrate=11225.2kbitsframe= 1235 fps=7.9 q=22.0 size=   65024kB time=00:00:47.28 bitrate=11266.4kbitsframe= 1245 fps=8.0 q=22.0 size=   65536kB time=00:00:47.68 bitrate=11259.9kbitsframe= 1250 fps=7.9 q=22.0 size=   65536kB time=00:00:47.88 bitrate=11212.8kbitsMore than 1000 frames duplicated   
frame= 1255 fps=7.9 q=22.0 size=   65792kB time=00:00:48.08 bitrate=11209.8kbitsframe= 1265 fps=8.0 q=22.0 size=   66304kB time=00:00:48.48 bitrate=11203.8kbitsframe= 1270 fps=7.9 q=22.0 size=   66304kB time=00:00:48.68 bitrate=11157.8kbitsframe= 1285 fps=7.9 q=22.0 size=   66816kB time=00:00:49.28 bitrate=11107.1kbitsframe= 1290 fps=7.9 q=22.0 size=   67328kB time=00:00:49.48 bitrate=11146.9kbitsframe= 1300 fps=8.0 q=22.0 size=   67840kB time=00:00:49.88 bitrate=11141.6kbitsframe= 1305 fps=7.9 q=22.0 size=   67840kB time=00:00:50.08 bitrate=11097.1kbitsframe= 1310 fps=7.9 q=22.0 size=   68096kB time=00:00:50.28 bitrate=11094.7kbitsframe= 1320 fps=8.0 q=22.0 size=   68608kB time=00:00:50.68 bitrate=11089.9kbitsframe= 1325 fps=7.9 q=22.0 size=   68608kB time=00:00:50.88 bitrate=11046.3kbitsframe= 1330 fps=7.9 q=22.0 size=   68864kB time=00:00:51.08 bitrate=11044.1kbitsframe= 1340 fps=8.0 q=22.0 size=   69376kB time=00:00:51.48 bitrate=11039.8kbitsframe= 1350 fps=8.0 q=22.0 size=   69632kB time=00:00:51.88 bitrate=10995.1kbitsframe= 1355 fps=7.9 q=22.0 size=   70144kB time=00:00:52.08 bitrate=11033.4kbitsframe= 1365 fps=8.0 q=22.0 size=   70656kB time=00:00:52.48 bitrate=11029.2kbitsframe= 1370 fps=7.9 q=22.0 size=   70912kB time=00:00:52.68 bitrate=11027.2kbitsframe= 1375 fps=7.9 q=22.0 size=   70912kB time=00:00:52.88 bitrate=10985.5kbitsframe= 1385 fps=8.0 q=22.0 size=   71424kB time=00:00:53.28 bitrate=10981.7kbitsframe= 1395 fps=8.0 q=22.0 size=   71680kB time=00:00:53.68 bitrate=10938.9kbitsframe= 1400 fps=8.0 q=22.0 size=   72192kB time=00:00:53.88 bitrate=10976.2kbitsframe= 1410 fps=8.0 q=22.0 size=   72704kB time=00:00:54.28 bitrate=10972.6kbitsframe= 1415 fps=8.0 q=22.0 size=   72704kB time=00:00:54.48 bitrate=10932.3kbitsframe= 1420 fps=8.0 q=22.0 size=   73216kB time=00:00:54.68 bitrate=10969.0kbitsframe= 1430 fps=8.0 q=22.0 size=   73728kB time=00:00:55.08 bitrate=10965.5kbitsframe= 1435 fps=8.0 q=22.0 size=   73984kB time=00:00:55.28 bitrate=10963.8kbitsframe= 1440 fps=8.0 q=22.0 size=   74240kB time=00:00:55.48 bitrate=10962.0kbitsframe= 1445 fps=8.0 q=22.0 size=   74496kB time=00:00:55.68 bitrate=10960.3kbitsframe= 1455 fps=8.0 q=22.0 size=   74752kB time=00:00:56.08 bitrate=10919.5kbitsframe= 1460 fps=7.9 q=22.0 size=   75264kB time=00:00:56.28 bitrate=10955.3kbitsframe= 1465 fps=7.9 q=22.0 size=   75520kB time=00:00:56.48 bitrate=10953.6kbitsframe= 1470 fps=7.9 q=22.0 size=   75776kB time=00:00:56.68 bitrate=10951.9kbitsframe= 1480 fps=7.9 q=22.0 size=   76032kB time=00:00:57.08 bitrate=10911.9kbitsframe= 1485 fps=7.9 q=22.0 size=   76544kB time=00:00:57.28 bitrate=10947.1kbitsframe= 1490 fps=7.9 q=22.0 size=   77056kB time=00:00:57.48 bitrate=10981.9kbitsframe= 1495 fps=7.9 q=22.0 size=   77312kB time=00:00:57.68 bitrate=10980.2kbitsframe= 1505 fps=7.9 q=22.0 size=   77824kB time=00:00:58.08 bitrate=10976.8kbitsframe= 1510 fps=7.9 q=22.0 size=   78080kB time=00:00:58.28 bitrate=10975.1kbitsframe= 1515 fps=7.8 q=22.0 size=   78592kB time=00:00:58.48 bitrate=11009.3kbitsframe= 1520 fps=7.8 q=22.0 size=   79104kB time=00:00:58.68 bitrate=11043.3kbitsframe= 1530 fps=7.8 q=22.0 size=   79360kB time=00:00:59.08 bitrate=11004.0kbitsframe= 1540 fps=7.9 q=22.0 size=   80384kB time=00:00:59.48 bitrate=11069.3kbitsframe= 1545 fps=7.8 q=22.0 size=   80384kB time=00:00:59.68 bitrate=11033.9kbitsframe= 1550 fps=7.8 q=22.0 size=   80896kB time=00:00:59.88 bitrate=11067.1kbitsframe= 1555 fps=7.8 q=22.0 size=   81152kB time=00:01:00.08 bitrate=11065.2kbitsframe= 1565 fps=7.8 q=22.0 size=   81408kB time=00:01:00.48 bitrate=11026.7kbitsframe= 1570 fps=7.8 q=22.0 size=   81920kB time=00:01:00.68 bitrate=11059.5kbitsframe= 1575 fps=7.8 q=22.0 size=   82432kB time=00:01:00.88 bitrate=11092.0kbitsframe= 1580 fps=7.8 q=22.0 size=   82688kB time=00:01:01.08 bitrate=11090.0kbitsframe= 1590 fps=7.8 q=22.0 size=   83456kB time=00:01:01.48 bitrate=11120.2kbitsframe= 1595 fps=7.8 q=22.0 size=   83456kB time=00:01:01.68 bitrate=11084.2kbitsframe= 1600 fps=7.8 q=22.0 size=   84224kB time=00:01:01.88 bitrate=11150.0kbitsframe= 1610 fps=7.8 q=22.0 size=   84736kB time=00:01:02.28 bitrate=11145.7kbitsframe= 1615 fps=7.8 q=22.0 size=   84736kB time=00:01:02.48 bitrate=11110.1kbitsframe= 1620 fps=7.7 q=22.0 size=   85248kB time=00:01:02.68 bitrate=11141.5kbitsframe= 1625 fps=7.7 q=22.0 size=   85504kB time=00:01:02.88 bitrate=11139.4kbitsframe= 1635 fps=7.7 q=22.0 size=   85760kB time=00:01:03.28 bitrate=11102.2kbitsframe= 1640 fps=7.7 q=22.0 size=   86272kB time=00:01:03.48 bitrate=11133.3kbitsframe= 1650 fps=7.8 q=22.0 size=   86784kB time=00:01:03.88 bitrate=11129.2kbitsframe= 1655 fps=7.7 q=22.0 size=   86784kB time=00:01:04.08 bitrate=11094.5kbitsframe= 1660 fps=7.7 q=22.0 size=   87296kB time=00:01:04.28 bitrate=11125.2kbitsframe= 1670 fps=7.7 q=22.0 size=   87808kB time=00:01:04.68 bitrate=11121.3kbitsframe= 1675 fps=7.7 q=22.0 size=   87808kB time=00:01:04.88 bitrate=11087.0kbitsframe= 1680 fps=7.7 q=22.0 size=   88064kB time=00:01:05.08 bitrate=11085.1kbitsframe= 1690 fps=7.8 q=22.0 size=   88576kB time=00:01:05.48 bitrate=11081.5kbitsframe= 1695 fps=7.7 q=22.0 size=   88576kB time=00:01:05.68 bitrate=11047.7kbitsframe= 1700 fps=7.7 q=22.0 size=   88832kB time=00:01:05.88 bitrate=11046.0kbitsframe= 1705 fps=7.7 q=22.0 size=   89088kB time=00:01:06.08 bitrate=11044.3kbitsframe= 1715 fps=7.7 q=22.0 size=   89344kB time=00:01:06.48 bitrate=11009.4kbitsframe= 1720 fps=7.7 q=22.0 size=   89856kB time=00:01:06.68 bitrate=11039.3kbitsframe= 1730 fps=7.7 q=22.0 size=   90368kB time=00:01:07.08 bitrate=11036.0kbitsframe= 1735 fps=7.7 q=22.0 size=   90368kB time=00:01:07.28 bitrate=11003.2kbitsframe= 1740 fps=7.7 q=22.0 size=   90624kB time=00:01:07.48 bitrate=11001.6kbitsframe= 1745 fps=7.7 q=22.0 size=   90880kB time=00:01:07.68 bitrate=11000.1kbits[mp4 @ 0x7fcf4b80d800] Starting second pass: moving the moov atom to the beginning of the file
frame= 1745 fps=7.5 q=-1.0 Lsize=   93152kB time=00:01:09.82 bitrate=10929.1kbits/s dup=1396 drop=0 speed=0.302x    
video:89776kB audio:3318kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.062878%
[aac @ 0x7fcf4b817a00] Qavg: 65467.379
[libx264 @ 0x7fcf4b818c00] frame I:30    Avg QP:14.43  size:378130
[libx264 @ 0x7fcf4b818c00] frame P:439   Avg QP:17.96  size:183234
[libx264 @ 0x7fcf4b818c00] frame B:1276  Avg QP:17.89  size:   114
[libx264 @ 0x7fcf4b818c00] consecutive B-frames:  2.2%  0.7%  0.9% 96.3%
[libx264 @ 0x7fcf4b818c00] mb I  I16..4:  0.1% 97.1%  2.8%
[libx264 @ 0x7fcf4b818c00] mb P  I16..4:  0.4% 49.3%  4.7%  P16..4:  5.4%  8.7%  4.3%  0.0%  0.0%    skip:27.3%
[libx264 @ 0x7fcf4b818c00] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.4%  0.0%  0.0%  direct: 0.0%  skip:99.6%  L0:41.5% L1:52.9% BI: 5.6%
[libx264 @ 0x7fcf4b818c00] 8x8 transform intra:91.5% inter:92.3%
[libx264 @ 0x7fcf4b818c00] coded y,u,v intra: 98.2% 34.7% 37.1% inter: 5.1% 1.3% 1.1%
[libx264 @ 0x7fcf4b818c00] i16 v,h,dc,p: 25% 74%  1%  0%
[libx264 @ 0x7fcf4b818c00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 19% 41%  2%  3%  3%  1%  3%  4%
[libx264 @ 0x7fcf4b818c00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 32% 23% 10%  3% 11% 10%  4%  4%  4%
[libx264 @ 0x7fcf4b818c00] Weighted P-Frames: Y:19.1% UV:8.0%
[libx264 @ 0x7fcf4b818c00] ref P L0: 40.8% 21.5% 14.6% 18.0%  5.1%
[libx264 @ 0x7fcf4b818c00] ref B L0: 77.4% 15.6%  7.0%
[libx264 @ 0x7fcf4b818c00] ref B L1: 96.3%  3.7%
[libx264 @ 0x7fcf4b818c00] kb/s:10536.35