尝试将webm文件转换为mp4。结果是“转换失败”。我正在使用的其他webm文件可以转换。
inputfile.webm上的ffprobe信息
$ ffprobe -v quiet -print_format json -show_format -show_streams inputfile.webm
{
"streams": [
{
"index": 0,
"codec_name": "vp8",
"codec_long_name": "On2 VP8",
"profile": "0",
"codec_type": "video",
"codec_time_base": "1/30",
"codec_tag_string": "[0][0][0][0]",
"codec_tag": "0x0000",
"width": 640,
"height": 480,
"coded_width": 640,
"coded_height": 480,
"has_b_frames": 0,
"sample_aspect_ratio": "1:1",
"display_aspect_ratio": "4:3",
"pix_fmt": "yuv420p",
"level": -99,
"field_order": "progressive",
"refs": 1,
"r_frame_rate": "30/1",
"avg_frame_rate": "30/1",
"time_base": "1/1000",
"start_pts": 0,
"start_time": "0.000000",
"disposition": {
"default": 1,
"dub": 0,
"original": 0,
"comment": 0,
"lyrics": 0,
"karaoke": 0,
"forced": 0,
"hearing_impaired": 0,
"visual_impaired": 0,
"clean_effects": 0,
"attached_pic": 0,
"timed_thumbnails": 0
}
},
{
"index": 1,
"codec_name": "opus",
"codec_long_name": "Opus (Opus Interactive Audio Codec)",
"codec_type": "audio",
"codec_time_base": "1/48000",
"codec_tag_string": "[0][0][0][0]",
"codec_tag": "0x0000",
"sample_fmt": "fltp",
"sample_rate": "48000",
"channels": 1,
"channel_layout": "mono",
"bits_per_sample": 0,
"r_frame_rate": "0/0",
"avg_frame_rate": "0/0",
"time_base": "1/1000",
"start_pts": 0,
"start_time": "0.000000",
"duration_ts": 12333,
"duration": "12.333000",
"disposition": {
"default": 1,
"dub": 0,
"original": 0,
"comment": 0,
"lyrics": 0,
"karaoke": 0,
"forced": 0,
"hearing_impaired": 0,
"visual_impaired": 0,
"clean_effects": 0,
"attached_pic": 0,
"timed_thumbnails": 0
}
}
],
"format": {
"filename": "inputfile.webm",
"nb_streams": 2,
"nb_programs": 0,
"format_name": "matroska,webm",
"format_long_name": "Matroska / WebM",
"start_time": "0.000000",
"duration": "12.333000",
"size": "1609303",
"bit_rate": "1043900",
"probe_score": 100,
"tags": {
"encoder": "Lavf56.40.101",
"creation_time": "2020-06-12T11:32:05.000000Z"
}
}
}
命令“ ffmpeg -i inputfile.webm out.mp4”的ffmpeg转换日志如下。
$ ffmpeg -i inputfile.webm out.mp4
ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
built with Apple clang version 11.0.3 (clang-1103.0.32.59)
configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.2_3 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags=-fno-stack-check --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
libavutil 56. 31.100 / 56. 31.100
libavcodec 58. 54.100 / 58. 54.100
libavformat 58. 29.100 / 58. 29.100
libavdevice 58. 8.100 / 58. 8.100
libavfilter 7. 57.100 / 7. 57.100
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 5.100 / 5. 5.100
libswresample 3. 5.100 / 3. 5.100
libpostproc 55. 5.100 / 55. 5.100
Input #0, matroska,webm, from 'inputfile.webm':
Metadata:
encoder : Lavf56.40.101
creation_time : 2020-06-12T11:32:05.000000Z
Duration: 00:00:12.33, start: 0.000000, bitrate: 1043 kb/s
Stream #0:0: Video: vp8, yuv420p(progressive), 640x480, SAR 1:1 DAR 4:3, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)
Stream #0:1: Audio: opus, 48000 Hz, mono, fltp (default)
Stream mapping:
Stream #0:0 -> #0:0 (vp8 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (opus (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 0x7f9e64811600] using SAR=1/1
[libx264 @ 0x7f9e64811600] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x7f9e64811600] profile High, level 5.0
[libx264 @ 0x7f9e64811600] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - 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=18 lookahead_threads=3 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
Too many packets buffered for output stream 0:0.577014:32:22.77 bitrate= -0.0kbits/s dup=45 drop=0 speed=N/A
[libx264 @ 0x7f9e64811600] frame I:1 Avg QP:16.69 size: 56001
[libx264 @ 0x7f9e64811600] frame P:33 Avg QP:19.46 size: 9705
[libx264 @ 0x7f9e64811600] frame B:95 Avg QP:19.23 size: 662
[libx264 @ 0x7f9e64811600] consecutive B-frames: 0.8% 0.0% 4.6% 94.7%
[libx264 @ 0x7f9e64811600] mb I I16..4: 46.7% 36.4% 16.9%
[libx264 @ 0x7f9e64811600] mb P I16..4: 4.0% 9.4% 0.5% P16..4: 6.5% 1.2% 0.6% 0.0% 0.0% skip:77.8%
[libx264 @ 0x7f9e64811600] mb B I16..4: 0.1% 0.1% 0.0% B16..8: 6.0% 0.1% 0.0% direct: 0.7% skip:93.0% L0:44.7% L1:54.8% BI: 0.4%
[libx264 @ 0x7f9e64811600] 8x8 transform intra:61.3% inter:37.9%
[libx264 @ 0x7f9e64811600] coded y,uvDC,uvAC intra: 8.6% 3.3% 1.3% inter: 0.9% 0.9% 0.1%
[libx264 @ 0x7f9e64811600] i16 v,h,dc,p: 41% 52% 6% 1%
[libx264 @ 0x7f9e64811600] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 42% 16% 41% 0% 0% 0% 0% 0% 0%
[libx264 @ 0x7f9e64811600] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 32% 40% 17% 2% 2% 2% 2% 1% 3%
[libx264 @ 0x7f9e64811600] i8c dc,h,v,p: 88% 8% 3% 0%
[libx264 @ 0x7f9e64811600] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x7f9e64811600] ref P L0: 75.5% 13.1% 9.1% 2.3%
[libx264 @ 0x7f9e64811600] ref B L0: 82.1% 16.4% 1.5%
[libx264 @ 0x7f9e64811600] ref B L1: 97.0% 3.0%
[libx264 @ 0x7f9e64811600] kb/s:816.97
Conversion failed!
我对ffmpeg转换和编解码器没有更深的经验。在我看来，这是与帧有关的问题。您有线索为什么会失败吗？我应该在ffmpeg命令中使用哪些选项来解决此问题？感谢您的帮助。