使用ffmpeg录制时视频持续时间错误
我正在尝试使用ffmpeg录制H264视频 为了做到这一点，我从视频源抓取帧，并将其推入FFmpeg读取并随后写入文件的管道中 我的问题是，当我录制10秒的视频时，该文件包含加速的完整视频，即最后的持续时间3秒 我相信我遇到的问题可能与帧速率有关，因为我说的是以30 FPS的速度录制，但我只能提供10 FPS 以下是我在FFmpeg中使用的选项： -线程队列大小512-帧速率30-f原始视频-pix\U fmt rgb32-视频大小1920x1080-i\.\pipe\pipe\U名称-vcodec libx264-crf 23-pix\U fmt yuv420p-预设超快-r 30“输出.mp4” 以下是FFmpeg日志：使用ffmpeg录制时视频持续时间错误,ffmpeg,h.264,frame-rate,Ffmpeg,H.264,Frame Rate,我正在尝试使用ffmpeg录制H264视频 为了做到这一点，我从视频源抓取帧，并将其推入FFmpeg读取并随后写入文件的管道中 我的问题是，当我录制10秒的视频时，该文件包含加速的完整视频，即最后的持续时间3秒 我相信我遇到的问题可能与帧速率有关，因为我说的是以30 FPS的速度录制，但我只能提供10 FPS 以下是我在FFmpeg中使用的选项： -线程队列大小512-帧速率30-f原始视频-pix\U fmt rgb32-视频大小1920x1080-i\.\pipe\pipe\U名称-vcod
2018-10-04 15:56:11.9342 | INFO | ffmpeg version N-91715-gd71dfc087b Copyright (c) 2000-2018 the FFmpeg developers
2018-10-04 15:56:11.9402 | INFO | built with gcc 8.2.1 (GCC) 20180813
2018-10-04 15:56:11.9402 | INFO | configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
2018-10-04 15:56:11.9402 | INFO | libavutil 56. 19.100 / 56. 19.100
2018-10-04 15:56:11.9542 | INFO | libavcodec 58. 27.100 / 58. 27.100
2018-10-04 15:56:11.9542 | INFO | libavformat 58. 17.103 / 58. 17.103
2018-10-04 15:56:11.9728 | INFO | libavdevice 58. 4.101 / 58. 4.101
2018-10-04 15:56:11.9728 | INFO | libavfilter 7. 26.100 / 7. 26.100
2018-10-04 15:56:11.9999 | INFO | libswscale 5. 2.100 / 5. 2.100
2018-10-04 15:56:12.0239 | INFO | libswresample 3. 2.100 / 3. 2.100
2018-10-04 15:56:12.0239 | INFO | libpostproc 55. 2.100 / 55. 2.100
2018-10-04 15:56:12.0350 | INFO | Input #0, rawvideo, from '\\.\pipe\pipe_name':
2018-10-04 15:56:12.0350 | INFO | Duration: N/A, start: 0.000000, bitrate: 1990656 kb/s
2018-10-04 15:56:12.0350 | INFO | Stream #0:0: Video: rawvideo (BGRA / 0x41524742), bgra, 1920x1080, 1990656 kb/s, 30 tbr, 30 tbn, 30 tbc
2018-10-04 15:56:12.0481 | INFO | Stream mapping:
2018-10-04 15:56:12.0481 | INFO | Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
2018-10-04 15:56:12.0691 | INFO | Press [q] to stop, [?] for help
2018-10-04 15:56:12.0881 | INFO | [libx264 @ 000001bceea618c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
2018-10-04 15:56:12.0881 | INFO | [libx264 @ 000001bceea618c0] profile Constrained Baseline, level 4.0, 4:2:0, 8-bit
2018-10-04 15:56:12.0951 | INFO | [libx264 @ 000001bceea618c0] 264 - core 157 r2932 303c484 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=30.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
2018-10-04 15:56:12.0951 | INFO | Output #0, mp4, to 'output.mp4':
2018-10-04 15:56:12.0951 | INFO | Metadata:
2018-10-04 15:56:12.0951 | INFO | encoder : Lavf58.17.103
2018-10-04 15:56:12.0951 | INFO | Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1920x1080, q=-1--1, 30 fps, 15360 tbn, 30 tbc
2018-10-04 15:56:12.1171 | INFO | Metadata:
2018-10-04 15:56:12.1171 | INFO | encoder : Lavc58.27.100 libx264
2018-10-04 15:56:12.1531 | INFO | Side data:
2018-10-04 15:56:12.1691 | INFO | cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
2018-10-04 15:56:12.8750 | INFO | frame= 8 fps=0.0 q=31.0 size= 0kB time=00:00:00.00 bitrate=5907.7kbits/s speed=0.000121x
2018-10-04 15:56:13.3238 | INFO | frame= 11 fps=9.9 q=31.0 size= 0kB time=00:00:00.10 bitrate= 3.8kbits/s speed=0.0904x
2018-10-04 15:56:13.7782 | INFO | frame= 16 fps=9.5 q=31.0 size= 0kB time=00:00:00.26 bitrate= 1.4kbits/s speed=0.159x
2018-10-04 15:56:14.2346 | INFO | frame= 21 fps=9.5 q=31.0 size= 0kB time=00:00:00.43 bitrate= 0.9kbits/s speed=0.197x
2018-10-04 15:56:14.8011 | INFO | frame= 27 fps=9.7 q=31.0 size= 0kB time=00:00:00.63 bitrate= 0.6kbits/s speed=0.229x
2018-10-04 15:56:15.4266 | INFO | frame= 33 fps=9.7 q=32.0 size= 0kB time=00:00:00.83 bitrate= 0.5kbits/s speed=0.246x
2018-10-04 15:56:16.0827 | INFO | frame= 39 fps=9.6 q=31.0 size= 256kB time=00:00:01.03 bitrate=2029.7kbits/s speed=0.255x
2018-10-04 15:56:16.7291 | INFO | frame= 47 fps= 10 q=31.0 size= 256kB time=00:00:01.30 bitrate=1613.4kbits/s speed=0.277x
2018-10-04 15:56:17.4279 | INFO | frame= 54 fps= 10 q=31.0 size= 256kB time=00:00:01.53 bitrate=1367.9kbits/s speed=0.284x
2018-10-04 15:56:18.0562 | INFO | frame= 61 fps= 10 q=31.0 size= 512kB time=00:00:01.76 bitrate=2374.3kbits/s speed=0.298x
2018-10-04 15:56:18.5401 | INFO | frame= 64 fps=9.9 q=31.0 size= 512kB time=00:00:01.86 bitrate=2247.1kbits/s speed=0.287x
2018-10-04 15:56:19.2106 | INFO | frame= 70 fps=9.9 q=32.0 size= 512kB time=00:00:02.06 bitrate=2029.6kbits/s speed=0.293x
2018-10-04 15:56:19.6653 | INFO | frame= 75 fps=9.9 q=31.0 size= 512kB time=00:00:02.23 bitrate=1878.2kbits/s speed=0.294x
2018-10-04 15:56:20.1512 | INFO | frame= 78 fps=9.6 q=31.0 size= 512kB time=00:00:02.33 bitrate=1797.7kbits/s speed=0.287x
2018-10-04 15:56:21.0577 | INFO | frame= 84 fps=9.3 q=31.0 size= 768kB time=00:00:02.53 bitrate=2483.6kbits/s speed=0.281x
2018-10-04 15:56:21.6416 | INFO | frame= 91 fps=9.5 q=31.0 size= 768kB time=00:00:02.76 bitrate=2274.1kbits/s speed=0.29x
2018-10-04 15:56:22.1779 | INFO | frame= 97 fps=9.6 q=31.0 size= 768kB time=00:00:02.96 bitrate=2120.8kbits/s speed=0.295x
2018-10-04 15:56:22.6571 | INFO | frame= 101 fps=9.5 q=-1.0 Lsize= 1015kB time=00:00:03.33 bitrate=2495.6kbits/s speed=0.313x
2018-10-04 15:56:22.6571 | INFO | video:1014kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.117556%
2018-10-04 15:56:22.6571 | INFO | [libx264 @ 000001bceea618c0] frame I:1 Avg QP:27.00 size: 60682
2018-10-04 15:56:22.6571 | INFO | [libx264 @ 000001bceea618c0] frame P:100 Avg QP:31.09 size: 9774
2018-10-04 15:56:22.6571 | INFO | [libx264 @ 000001bceea618c0] mb I I16..4: 100.0% 0.0% 0.0%
2018-10-04 15:56:22.6736 | INFO | [libx264 @ 000001bceea618c0] mb P I16..4: 10.6% 0.0% 0.0% P16..4: 15.2% 0.0% 0.0% 0.0% 0.0% skip:74.3%
2018-10-04 15:56:22.6736 | INFO | [libx264 @ 000001bceea618c0] coded y,uvDC,uvAC intra: 15.8% 24.4% 1.4% inter: 4.8% 6.8% 0.0%
2018-10-04 15:56:22.6736 | INFO | [libx264 @ 000001bceea618c0] i16 v,h,dc,p: 39% 20% 15% 26%
2018-10-04 15:56:22.6736 | INFO | [libx264 @ 000001bceea618c0] i8c dc,h,v,p: 54% 19% 20% 7%
2018-10-04 15:56:22.6896 | INFO | [libx264 @ 000001bceea618c0] kb/s:2466.66
我研究了一个名为-vsync的FFmpeg选项，但没有取得任何成功。添加
-使用“wallclock”作为“timestamps true”-I原始视频输入没有固有的时间戳，因此，解复用器根据帧率值生成平滑序列我从未尝试从管道中获取输入，只是出于好奇，如果您删除第一个
-framerate 30-vsync vfr-r 30