问题描述
因此，我正在使用此代码来压缩我的* mp4文件.我需要降低质量并降低比特率:
So, I'm using this code to compress my *mp4 file. I need to get lower quality and decrease bitrate:
ffmpeg -i input.mp4 -c:v libx264 output.mp4
问题是:ffmpeg压缩后，镜头的最后一帧被丢弃.屏幕截图位于此处: screenshot_ffmpeg_drop框架
The problem is: the last frame of footage is dropped after ffmpeg compression.Screenshot is here: screenshot_ffmpeg_drop frame
我尝试使用所需的完整首选项，但问题是相同的.
I tried to use full preferences I need, but the problem is the same.
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
logfile:
logfile during ffmpeg encoding:
流映射:流#0:0->#0:0(h264(native)-> h264 (libx264))按[q]停止，按[?]寻求帮助[libx264 @ 使用SAR = 1/1的000002fae8b50780] [libx264 @ 000002fae8b50780]使用cpu 功能:MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 [libx264 @ 000002fae8b50780]配置文件高，级别3.1 [libx264 @ 000002fae8b50780] 264-核心155 r2901 7d0ff22-H.264/MPEG-4 AVC编解码器-Copyleft 2003-2018- http://www.videolan.org/x264.html -选项: cabac = 1 ref = 2 deblock = 1:0:0分析= 0x3:0x113 me =十六进制subme = 6 psy = 1 psy_rd = 1.00:0.00 mixed_ref = 1 me_range = 16 chroma_me = 1格子= 1 8x8dct = 1 cqm = 0 死区= 21,11 fast_pskip = 1 chroma_qp_offset = -2线程= 12 lookahead_threads = 2 sliced_threads = 0 nr = 0抽取= 1隔行扫描= 0 bluray_compat = 0 constrained_intra = 0 bframes = 3 b_pyramid = 2 b_adapt = 1 b_bias = 0直接= 1权重b = 1 open_gop = 0权重p = 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输出#0，mp4，到'\ output.mp4':元数据: major_brand:mp42 minor_version:0 兼容品牌:mp42mp41 编码器:Lavf58.17.100 流#0:0(eng):视频:h264(libx264)(avc1/0x31637661)，yuv420p，1280x720 [SAR 1:1 DAR 16:9]，q = -1--1、25 fps，12800 tbn，25 tbc(默认) 元数据: creation_time:2018-10-28T11:06:03.000000Z handler_name:别名数据处理程序 编码器:Lavc58.19.104 libx264 辅助数据: cpb:最大/最小/平均比特率:0/0/0缓冲区大小:0 vbv_delay:-1
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时间= 00:00:12.60比特率= 556.0kbits/s速度= 5.05x视频:851kB音频:0kB字幕:0kB其他流:0kB全局标头:0kB混合开销:0.534683％[libx264 @ 0000015d5cef0500]帧I:2平均QP:26.18大小:67800 [libx264 @ 0000015d5cef0500]帧P:80平均QP:27.93大小:5439 [libx264 @ 0000015d5cef0500]帧B:236平均QP:32.44大小:1269 [libx264 @ 0000015d5cef0500]连续的B帧: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％跳过:53.6％[libx264 @ 0000015d5cef0500] mb B I16..4:0.6％0.5％0.0％B16..8:22.2％0.6％0.0％直接:2.0％ 跳过:74.2％L0:44.9％L1:54.5％BI:0.6％[libx264 @ 0000015d5cef0500] 8x8转换内部:55.0％内部:86.2％[libx264 @ 0000015d5cef0500] 编码y，uvDC，uvAC内部:48.1％54.9％27.0％内部: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％7％9％5％7％ [libx264 @ 0000015d5cef0500] i8c dc，h，v，p:60％20％15％4％[libx264 @ 0000015d5cef0500]加权P帧:Y:0.0％UV:0.0％[libx264 @ 0000015d5cef0500]参考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
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
推荐答案
使用
ffmpeg -ignore_editlist 1 -i input.mp4 ... output.mp4
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