我正在尝试使用 ffmpeg 将 JPEG 转换为 MP4。我已经让该过程适用于 PNG，所以我知道我走在正确的轨道上。当 ffmpeg 完成 JPEG 处理后，生成的 MP4 可以在 smplayer（OpenSuse）上播放，但 omxplayer（Raspberry Pi）并不像预期的那样。它似乎可以正确播放前几帧，它们在屏幕上闪烁得太快以至于看不见，然后它会播放各种颜色，主要是绿色阴影，作为静态图像。
我已经尝试将 JPEG 转换为 PNG，然后再将其推送到 ffmpeg，但奇怪的是，这没有奏效。我猜我需要一个开关/选项，这样 ffmpeg 就会以允许 omxplayer 正确播放 mp4 的格式构建 mp4。
脚本中的部分是...
set -x
echo "Source image: ${SOURCE_IMAGE}" >&2
ffmpeg -loop 1 -pattern_type glob -i "/tmp/${LN_PREFIX}.fade-*.$$.${SOURCE_EXTENSION}" -c:v libx264 ${IMPORT_FORMAT} -t ${DISPLAY_SECONDS} -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" -r ${FPS} /tmp/slide.$$.mp4 # 1>/dev/null 2>&1
set +x
我得到的输出是
Source image: public/user_files/campaigns/5/DSC_0011.JPG
Creating the full length mp4 public/user_files/campaigns/5/DSC_0011.JPG-seconds_15-fade_1.mp4
+ ffmpeg -loop 1 -pattern_type glob -i '/tmp/DSC_0011.JPG.fade-*.2367.JPG' -c:v libx264 -t 15 -vf 'scale=trunc(iw/2)*2:trunc(ih/2)*2' -r 25 /tmp/slide.2367.mp4
ffmpeg version N-79177-ga677121 Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.1)
configuration: --prefix=/usr/local/bin --pkg-config-flags=--static --extra-cflags=-I/home/mike/ffmpeg_build/include --extra-ldflags=-L/home/mike/ffmpeg_build/lib --bindir=/usr/local/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
libavutil 55. 19.100 / 55. 19.100
libavcodec 57. 32.100 / 57. 32.100
libavformat 57. 29.101 / 57. 29.101
libavdevice 57. 0.101 / 57. 0.101
libavfilter 6. 40.102 / 6. 40.102
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, image2, from '/tmp/DSC_0011.JPG.fade-*.2367.JPG':
Duration: 00:00:00.08, start: 0.000000, bitrate: N/A
Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 2048x1536, 25 fps, 25 tbr, 25 tbn, 25 tbc
No pixel format specified, yuvj420p for H.264 encoding chosen.
Use -pix_fmt yuv420p for compatibility with outdated media players.
[libx264 @ 0x2f82e00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX XOP FMA4 FMA3 LZCNT BMI1
[libx264 @ 0x2f82e00] profile High, level 5.0
[libx264 @ 0x2f82e00] 264 - core 142 r2389 956c8d8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - 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=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=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to '/tmp/slide.2367.mp4':
Metadata:
encoder : Lavf57.29.101
Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuvj420p(pc), 2048x1536, q=-1--1, 25 fps, 12800 tbn, 25 tbc
Metadata:
encoder : Lavc57.32.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream mapping:
Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Press [q] to stop, [?] for help
frame= 19 fps=0.0 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A speed= 0x
frame= 37 fps= 35 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A speed= 0x
frame= 50 fps= 32 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A speed= 0x
frame= 62 fps= 30 q=28.0 size= 507kB time=00:00:00.40 bitrate=10386.6kbits/s speed=0.191x
frame= 75 fps= 29 q=28.0 size= 511kB time=00:00:00.92 bitrate=4546.7kbits/s speed=0.353x
frame= 89 fps= 29 q=28.0 size= 513kB time=00:00:01.48 bitrate=2841.8kbits/s speed=0.475x
frame= 104 fps= 29 q=28.0 size= 516kB time=00:00:02.08 bitrate=2032.3kbits/s speed=0.571x
frame= 118 fps= 28 q=28.0 size= 518kB time=00:00:02.64 bitrate=1607.9kbits/s speed=0.63x
frame= 133 fps= 28 q=28.0 size= 521kB time=00:00:03.24 bitrate=1316.6kbits/s speed=0.684x
frame= 148 fps= 28 q=28.0 size= 523kB time=00:00:03.84 bitrate=1116.3kbits/s speed=0.729x
frame= 162 fps= 28 q=28.0 size= 525kB time=00:00:04.40 bitrate= 978.3kbits/s speed=0.762x
frame= 175 fps= 28 q=28.0 size= 528kB time=00:00:04.92 bitrate= 878.3kbits/s speed=0.783x
frame= 190 fps= 28 q=28.0 size= 530kB time=00:00:05.52 bitrate= 786.6kbits/s speed=0.808x
frame= 205 fps= 28 q=28.0 size= 533kB time=00:00:06.12 bitrate= 712.9kbits/s speed=0.832x
frame= 219 fps= 28 q=28.0 size= 535kB time=00:00:06.68 bitrate= 655.8kbits/s speed=0.848x
frame= 234 fps= 28 q=28.0 size= 537kB time=00:00:07.28 bitrate= 604.6kbits/s speed=0.867x
frame= 248 fps= 28 q=28.0 size= 540kB time=00:00:07.84 bitrate= 564.0kbits/s speed=0.879x
frame= 263 fps= 28 q=28.0 size= 542kB time=00:00:08.44 bitrate= 526.1kbits/s speed=0.892x
frame= 278 fps= 28 q=28.0 size= 545kB time=00:00:09.04 bitrate= 493.5kbits/s speed=0.906x
frame= 291 fps= 28 q=28.0 size= 547kB time=00:00:09.56 bitrate= 468.4kbits/s speed=0.911x
frame= 302 fps= 27 q=28.0 size= 1190kB time=00:00:10.00 bitrate= 975.0kbits/s speed=0.908x
frame= 317 fps= 27 q=28.0 size= 1192kB time=00:00:10.60 bitrate= 921.2kbits/s speed=0.919x
frame= 332 fps= 27 q=28.0 size= 1194kB time=00:00:11.20 bitrate= 873.1kbits/s speed=0.927x
frame= 348 fps= 28 q=28.0 size= 1196kB time=00:00:11.84 bitrate= 827.2kbits/s speed=0.94x
frame= 363 fps= 28 q=28.0 size= 1197kB time=00:00:12.44 bitrate= 788.4kbits/s speed=0.948x
frame= 375 fps= 26 q=-1.0 Lsize= 1209kB time=00:00:14.92 bitrate= 663.9kbits/s speed=1.02x
video:1204kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.433904%
[libx264 @ 0x2f82e00] frame I:2 Avg QP:17.15 size:583658
[libx264 @ 0x2f82e00] frame P:94 Avg QP:18.65 size: 376
[libx264 @ 0x2f82e00] frame B:279 Avg QP:30.33 size: 105
[libx264 @ 0x2f82e00] consecutive B-frames: 0.8% 0.0% 0.0% 99.2%
[libx264 @ 0x2f82e00] mb I I16..4: 0.5% 87.2% 12.3%
[libx264 @ 0x2f82e00] mb P I16..4: 0.0% 0.0% 0.0% P16..4: 1.4% 0.0% 0.0% 0.0% 0.0% skip:98.6%
[libx264 @ 0x2f82e00] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 0.1% 0.0% 0.0% direct: 0.0% skip:99.9% L0:25.6% L1:74.4% BI: 0.0%
[libx264 @ 0x2f82e00] 8x8 transform intra:87.2% inter:95.2%
[libx264 @ 0x2f82e00] coded y,uvDC,uvAC intra: 99.4% 99.1% 95.1% inter: 0.0% 0.3% 0.0%
[libx264 @ 0x2f82e00] i16 v,h,dc,p: 4% 2% 9% 84%
[libx264 @ 0x2f82e00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 21% 10% 6% 8% 8% 9% 9% 14%
[libx264 @ 0x2f82e00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 20% 8% 7% 10% 9% 11% 8% 11%
[libx264 @ 0x2f82e00] i8c dc,h,v,p: 39% 36% 10% 15%
[libx264 @ 0x2f82e00] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x2f82e00] ref P L0: 92.8% 0.0% 6.2% 1.0%
[libx264 @ 0x2f82e00] ref B L0: 96.3% 3.6% 0.1%
[libx264 @ 0x2f82e00] ref B L1: 99.3% 0.7%
[libx264 @ 0x2f82e00] kb/s:657.11
+ set +x