ffmpeg - 从 MP4 压缩到 MP4 (libx264) 时 ffmpeg 丢弃最后一帧

Question

所以，我正在使用这段代码来压缩我的 *mp4 文件。我需要降低质量并降低比特率:

ffmpeg -i input.mp4 -c:v libx264 output.mp4

问题是:在 ffmpeg 压缩后，最后一帧的素材被丢弃了。
截图在这里: screenshot_ffmpeg_drop frame

我尝试使用我需要的完整首选项，但问题是一样的。

ffmpeg -i input.mp4 -c:v libx264 -vf scale=1280:720 -preset fast -crf 29 -r 25 -c:a copy output.mp4

ffmpeg 编码期间的日志文件:

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '\input.mp4': Metadata: major_brand : mp42 minor_version : 0 compatible_brands: mp42mp41 creation_time : 2018-10-28T11:06:03.000000Z Duration: 00:00:12.76, start: 0.000000, bitrate: 5374 kb/s Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 5368 kb/s, 25 fps, 25 tbr, 50k tbn, 50 tbc (default) Metadata: creation_time : 2018-10-28T11:06:03.000000Z handler_name : Alias Data Handler encoder : AVC Coding

Stream mapping: Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264)) Press [q] to stop, [?] for help [libx264 @ 000002fae8b50780] using SAR=1/1 [libx264 @ 000002fae8b50780] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 [libx264 @ 000002fae8b50780] profile High, level 3.1 [libx264 @ 000002fae8b50780] 264 - core 155 r2901 7d0ff22 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=6 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=12 lookahead_threads=2 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=1 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=30 rc=crf mbtree=1 crf=29.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 Output #0, mp4, to '\output.mp4': Metadata: major_brand : mp42 minor_version : 0 compatible_brands: mp42mp41 encoder : Lavf58.17.100 Stream #0:0(eng): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default) Metadata: creation_time : 2018-10-28T11:06:03.000000Z handler_name : Alias Data Handler encoder : Lavc58.19.104 libx264 Side data: cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1

frame= 318 fps=127 q=-1.0 Lsize= 855kB time=00:00:12.60 bitrate= 556.0kbits/s speed=5.05x video:851kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.534683% [libx264 @ 0000015d5cef0500] frame I:2 Avg QP:26.18 size: 67800 [libx264 @ 0000015d5cef0500] frame P:80 Avg QP:27.93 size: 5439 [libx264 @ 0000015d5cef0500] frame B:236 Avg QP:32.44 size: 1269 [libx264 @ 0000015d5cef0500] consecutive B-frames: 0.9% 0.0% 0.9% 98.1% [libx264 @ 0000015d5cef0500] mb I I16..4: 10.6% 62.5% 26.8% [libx264 @ 0000015d5cef0500] mb P I16..4: 0.5% 1.0% 0.2% P16..4: 36.1% 5.1% 3.6% 0.0% 0.0% skip:53.6% [libx264 @ 0000015d5cef0500] mb B I16..4: 0.6% 0.5% 0.0% B16..8: 22.2% 0.6% 0.0% direct: 2.0% skip:74.2% L0:44.9% L1:54.5% BI: 0.6% [libx264 @ 0000015d5cef0500] 8x8 transform intra:55.0% inter:86.2% [libx264 @ 0000015d5cef0500] coded y,uvDC,uvAC intra: 48.1% 54.9% 27.0% inter: 3.2% 5.2% 0.2% [libx264 @ 0000015d5cef0500] i16 v,h,dc,p: 19% 56% 10% 15% [libx264 @ 0000015d5cef0500] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 25% 18% 5% 6% 5% 8% 5% 8% [libx264 @ 0000015d5cef0500] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 24% 9% 5% 8% 7% 9% 5% 7% [libx264 @ 0000015d5cef0500] i8c dc,h,v,p: 60% 20% 15% 4% [libx264 @ 0000015d5cef0500] Weighted P-Frames: Y:0.0% UV:0.0% [libx264 @ 0000015d5cef0500] ref P L0: 67.7% 32.3% [libx264 @ 0000015d5cef0500] ref B L0: 80.4% 19.6% [libx264 @ 0000015d5cef0500] ref B L1: 92.1% 7.9% [libx264 @ 0000015d5cef0500] kb/s:547.35

Answer 1

利用

ffmpeg -ignore_editlist 1 -i input.mp4 ... output.mp4