我有一个FFmpeg命令，其中我正在使用hstack过滤器并排合并2个视频。当我将第一个视频放在右侧，将第二个视频放在左侧时，最终合并的视频在质量上是完美的，并且播放流畅。
但是，当我在hstack过滤器中交换订单时，最终视频非常不连贯。
有人可以让我知道此命令中的问题吗？预先非常感谢。
此外，非工作文件的文件大小几乎是工作文件的两倍。你能解释为什么吗？
这是有效的命令：
init() ->
register(ex1_server, self()),
loop("newDefault", []).
输出：
ffmpeg -i 1_a.opus -i 2_a.opus -itsoffset 0.024 -i 1_v.mp4 -itsoffset 0.113 -i 2_v.mp4 -filter_complex "[1:a]adelay=15646|15646[a1]; [0:a][a1]amix; [3:v]trim=0:15.646,geq=0:128:128[silence]; [3:v]fifo[3v]; [silence][3v]concat[3_v_silence]; [3_v_silence][2:v]hstack" -preset ultrafast -y n_m_bars_try2.mp4
无效命令：
ffmpeg version 4.0.2-static https://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg
libavutil 56. 14.100 / 56. 14.100
libavcodec 58. 18.100 / 58. 18.100
libavformat 58. 12.100 / 58. 12.100
libavdevice 58. 3.100 / 58. 3.100
libavfilter 7. 16.100 / 7. 16.100
libswscale 5. 1.100 / 5. 1.100
libswresample 3. 1.100 / 3. 1.100
libpostproc 55. 1.100 / 55. 1.100
Input #0, ogg, from '1_a.opus':
Duration: 00:01:03.82, start: -0.020000, bitrate: 37 kb/s
Stream #0:0: Audio: opus, 48000 Hz, stereo, fltp
Input #1, ogg, from '2_a.opus':
Duration: 00:00:52.40, start: -0.020000, bitrate: 44 kb/s
Stream #1:0: Audio: opus, 48000 Hz, stereo, fltp
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from '1_v.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.12.100
Duration: 00:01:03.85, start: 0.000000, bitrate: 2644 kb/s
Stream #2:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 2633 kb/s, 333 fps, 333 tbr, 10656 tbn, 666 tbc (default)
Metadata:
handler_name : VideoHandler
Input #3, mov,mp4,m4a,3gp,3g2,mj2, from '2_v.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.12.100
Duration: 00:00:52.32, start: 0.000000, bitrate: 861 kb/s
Stream #3:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 860 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
Stream mapping:
Stream #0:0 (opus) -> amix:input0
Stream #1:0 (opus) -> adelay
Stream #2:0 (h264) -> hstack:input1
Stream #3:0 (h264) -> trim
Stream #3:0 (h264) -> fifo
amix -> Stream #0:0 (aac)
hstack -> Stream #0:1 (libx264)
Press [q] to stop, [?] for help
[libx264 @ 0x528d600] using SAR=1/1
[libx264 @ 0x528d600] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64 SlowShuffle
[libx264 @ 0x528d600] profile Constrained Baseline, level 3.1
[libx264 @ 0x528d600] 264 - core 155 r2901 7d0ff22 - 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=3 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=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
Output #0, mp4, to 'navid_mayank_bars_try2.mp4':
Metadata:
encoder : Lavf58.12.100
Stream #0:0: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
Metadata:
encoder : Lavc58.18.100 aac
Stream #0:1: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1280x480 [SAR 1:1 DAR 8:3], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
Metadata:
encoder : Lavc58.18.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame= 1704 fps= 42 q=-1.0 Lsize= 14440kB time=00:01:08.12 bitrate=1736.5kbits/s dup=3 drop=21229 speed=1.69x
video:13448kB audio:953kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.269503%
[aac @ 0x52b8680] Qavg: 22255.799
[libx264 @ 0x528d600] frame I:7 Avg QP:16.29 size: 46284
[libx264 @ 0x528d600] frame P:1697 Avg QP:18.36 size: 7924
[libx264 @ 0x528d600] mb I I16..4: 100.0% 0.0% 0.0%
[libx264 @ 0x528d600] mb P I16..4: 1.8% 0.0% 0.0% P16..4: 31.0% 0.0% 0.0% 0.0% 0.0% skip:67.2%
[libx264 @ 0x528d600] coded y,uvDC,uvAC intra: 29.9% 59.3% 17.5% inter: 13.4% 24.6% 0.8%
[libx264 @ 0x528d600] i16 v,h,dc,p: 36% 29% 18% 17%
[libx264 @ 0x528d600] i8c dc,h,v,p: 42% 25% 21% 11%
[libx264 @ 0x528d600] kb/s:1616.23
输出：
ffmpeg -i 1_a.opus -i 2_a.opus -itsoffset 0.024 -i 1_v.mp4 -itsoffset 0.113 -i 2_v.mp4 -filter_complex "[1:a]adelay=15646|15646[a1]; [0:a][a1]amix; [3:v]trim=0:15.646,geq=0:128:128[silence]; [3:v]fifo[3v]; [silence][3v]concat[3_v_silence]; [2:v][3_v_silence]hstack" -preset ultrafast -y m_n_bars_try2.mp4
答案 0 :(得分：0)
您的一个视频为333 fps，另一个为25。应用它们的顺序会影响输出文件的帧频。 25比333更容易输出。在声明输出文件之前尝试添加'-r pal'。