【发布时间】：2020-06-12 00:03:17
【问题描述】：
我有一组不同格式的视频片段，需要连接起来并作为单个视频上传到数据库。我需要以尽可能少的质量损失来做到这一点。例如，一组是：
video_1.mov - 796 frames, 432Mb,
video_2.mp4 - 913 frames, 58Mb,
video_3.mov - 625 frames, 345Mb
这应该连接到一个文件中：
output.mov - 2334 frames, ?Mb
到目前为止，我正在这样做：
- 使用lossless encoding 将
.mp4转换为.mov：
ffmpeg -i video_2.mp4 -c:v libx264 -preset veryslow -crf 0 -c:a copy video_2.mov
此步骤产生错误：
[h264 @ 0x558298795760] error while decoding MB 110 37, bytestream -69483.1kbits/s speed=0.227x
[h264 @ 0x558298795760] concealing 3659 DC, 3659 AC, 3659 MV errors in P frame
这仍然输出video_2.mov - frames 913, 112Mb
- 使用concat demuxer 合并视频：
ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.mov
mylist.txt 在哪里：
file 'video_1.mov'
file 'video_2.mov'
file 'video_3.mov'
但是，concat demuxer 命令给出了错误：
[concat @ 0x561cbae96900] Could not find codec parameters for stream 2 (Unknown: none): unknown codec.Consider increasing the value for the 'analyzeduration' and 'probesize' options
后跟多行：
[mov @ 0x555b5dca4f00] Non-monotonous DTS in output stream 0:1; previous: 1527575, current: 1168413; changing to 1527576. This may result in incorrect timestamps in the output file.
这些步骤的结果是output.mov，它是432+345+112=889Mb 的正确大小，但只有1421 帧等于video_1.mov - 796 frames 和video_3.mov - 625 frames 中的帧。当我播放串联版本output.mov 时，它会在video_2.mov 片段的持续时间内冻结，然后在video_3.mov 继续正常播放。
对此的任何帮助将不胜感激。
编辑：
按照产生的 cmets 运行 ffmpeg -n -i video_1.mov -i video_2.mp4 -i video_3.mov：
`ffmpeg version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
libavutil 55. 78.100 / 55. 78.100
libavcodec 57.107.100 / 57.107.100
libavformat 57. 83.100 / 57. 83.100
libavdevice 57. 10.100 / 57. 10.100
libavfilter 6.107.100 / 6.107.100
libavresample 3. 7. 0 / 3. 7. 0
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video_1.mov':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
creation_time : 2019-11-16T09:57:04.000000Z
keywords : iMovie
description :
title :
com.apple.quicktime.description:
com.apple.quicktime.displayname:
com.apple.quicktime.keywords: iMovie
com.apple.quicktime.title:
Duration: 00:00:31.84, start: 0.000000, bitrate: 108530 kb/s
Stream #0:0(eng): Audio: pcm_s16be (lpcm / 0x6D63706C), 48000 Hz, stereo, s16, 1536 kb/s (default)
Metadata:
creation_time : 2019-11-16T09:57:04.000000Z
handler_name : Core Media Data Handler
Stream #0:1(und): Video: prores (apcn / 0x6E637061), yuv422p10le(bt709, progressive), 1920x1080, 106992 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 25 tbn, 25 tbc (default)
Metadata:
creation_time : 2019-11-16T09:57:04.000000Z
handler_name : Core Media Data Handler
encoder : Apple ProRes 422
timecode : 00:00:00:00
Stream #0:2(und): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
Metadata:
creation_time : 2019-11-16T09:57:04.000000Z
handler_name : Core Media Data Handler
timecode : 00:00:00:00
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'video_2.mp4':
Metadata:
major_brand : mp42
minor_version : 1
compatible_brands: mp41mp42isom
creation_time : 2019-11-16T09:55:40.000000Z
Duration: 00:00:30.71, start: 0.000000, bitrate: 15320 kb/s
Stream #1:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 165 kb/s (default)
Metadata:
creation_time : 2019-11-16T09:55:40.000000Z
handler_name : Core Media Audio
Stream #1:1(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1920x1080, 15277 kb/s, 29.98 fps, 29.97 tbr, 90k tbn, 60 tbc (default)
Metadata:
creation_time : 2019-11-16T09:55:40.000000Z
handler_name : Core Media Video
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'video_3.mov':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
creation_time : 2019-11-16T09:57:19.000000Z
keywords : iMovie
description :
title :
com.apple.quicktime.description:
com.apple.quicktime.displayname:
com.apple.quicktime.keywords: iMovie
com.apple.quicktime.title:
Duration: 00:00:25.00, start: 0.000000, bitrate: 110329 kb/s
Stream #2:0(eng): Audio: pcm_s16be (lpcm / 0x6D63706C), 48000 Hz, stereo, s16, 1536 kb/s (default)
Metadata:
creation_time : 2019-11-16T09:57:19.000000Z
handler_name : Core Media Data Handler
Stream #2:1(und): Video: prores (apcn / 0x6E637061), yuv422p10le(bt709, progressive), 1920x1080, 108790 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 25 tbn, 25 tbc (default)
Metadata:
creation_time : 2019-11-16T09:57:19.000000Z
handler_name : Core Media Data Handler
encoder : Apple ProRes 422
timecode : 00:00:00:00
Stream #2:2(und): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
Metadata:
creation_time : 2019-11-16T09:57:19.000000Z
handler_name : Core Media Data Handler
timecode : 00:00:00:00
【问题讨论】：
-
运行此命令：
ffmpeg -n -i video_1.mov -i video_2.mp4 -i video_3.mov。此命令仅获取文件信息：它不输出文件。它将提供有关输入和您的ffmpeg版本的有用信息。需要此信息才能提供可以复制和粘贴的答案。从该命令复制 complete 日志。 Edit您的问题并将完整的日志粘贴到您的问题中。忽略日志中的At least one output file must be specified error。 -
@llogan 根据您的评论更新。谢谢。
标签： video ffmpeg concatenation