FFmpeg-不同时基的Concat视频 [英] FFmpeg - Concat videos with different time base
问题描述
我正在尝试使用concat多路分配器来concat视频，但是在使用一个视频时(下面的"video2.mp4")它不起作用. By不起作用，我的意思是在播放器上播放级联的视频之前，直到第二个视频部分开始播放为止(它再也无法读取视频了).它可以与concat过滤器一起使用.他们都是mp4影片，所以我认为是因为时间原因?我可以使用concat多路分配器连接其他视频，并且效果很好(即使使用不同的分辨率/比特率).仅在尝试连接"video2.mp4"时会发生这种情况.
I'm trying to concat videos with the concat demuxer, but it does not work when using one video ("video2.mp4" below). By does not work, I mean playing the concatenated video on a player will work until the second video part starts (it just cannot read the video anymore). It works with the concat filter though. They are both mp4 videos, so I think it's because of the time base ? I can concat other videos with the concat demuxer and it works fine (even with different resolutions/bitrate). It only happens when trying to concat "video2.mp4".
此外，我有很多这样的警告/错误，可能是当ffmpeg开始连接第二个视频时:
Also, I have a lot of warning/errors like this, probably when ffmpeg starts concatenating the 2nd video :
[mp4 @ 0x7f847a814800] Non-monotonous DTS in output stream 0:0; previous: 906906, current: 302359; changing to 906907. This may result in incorrect timestamps in the output file.
拥有最短连续时间的最佳方法是什么?如果确实存在问题，我是否真的需要使用concat过滤器还是可以更改"video1.mp4"的时基?
What would be the best way to have a minimum concat time ? Do I really need to use the concat filter or can I change the time base of "video1.mp4" if it's really the problem ?
任何帮助将不胜感激，谢谢！
Any help would be appreciated, thanks !
视频1:
ffprobe version 3.2.2 Copyright (c) 2007-2016 the FFmpeg developers
built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
libavutil 55. 34.100 / 55. 34.100
libavcodec 57. 64.101 / 57. 64.101
libavformat 57. 56.100 / 57. 56.100
libavdevice 57. 1.100 / 57. 1.100
libavfilter 6. 65.100 / 6. 65.100
libavresample 3. 1. 0 / 3. 1. 0
libswscale 4. 2.100 / 4. 2.100
libswresample 2. 3.100 / 2. 3.100
libpostproc 54. 1.100 / 54. 1.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video1.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
creation_time : 2016-08-17T22:50:35.000000Z
Duration: 00:00:10.11, start: 0.000000, bitrate: 38018 kb/s
Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 1696x848, 37832 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 180k tbc (default)
Metadata:
creation_time : 2016-08-18T00:02:24.000000Z
handler_name : VideoHandle
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s (default)
Metadata:
creation_time : 2016-08-18T00:02:24.000000Z
handler_name : SoundHandle
视频2:
ffprobe version 3.2.2 Copyright (c) 2007-2016 the FFmpeg developers
built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
libavutil 55. 34.100 / 55. 34.100
libavcodec 57. 64.101 / 57. 64.101
libavformat 57. 56.100 / 57. 56.100
libavdevice 57. 1.100 / 57. 1.100
libavfilter 6. 65.100 / 6. 65.100
libavresample 3. 1. 0 / 3. 1. 0
libswscale 4. 2.100 / 4. 2.100
libswresample 2. 3.100 / 2. 3.100
libpostproc 54. 1.100 / 54. 1.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video2.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42mp41
creation_time : 2017-01-06T22:30:23.000000Z
Duration: 00:00:08.19, start: 0.000000, bitrate: 101474 kb/s
Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 4096x2048 [SAR 1:1 DAR 2:1], 101549 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
Metadata:
creation_time : 2017-01-06T22:30:23.000000Z
handler_name : ?Mainconcept Video Media Handler
encoder : AVC Coding
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 125 kb/s (default)
Metadata:
creation_time : 2017-01-06T22:30:23.000000Z
handler_name : #Mainconcept MP4 Sound Media Handler
FFMpeg命令:
ffmpeg -f concat -safe 0 -i concat.txt -c copy result.mp4
concat.txt:
concat.txt :
file '/path/to/video1.mp4'
file '/path/to/video2.mp4'
命令结果:
ffmpeg version 3.2.2 Copyright (c) 2000-2016 the FFmpeg developers
built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
libavutil 55. 34.100 / 55. 34.100
libavcodec 57. 64.101 / 57. 64.101
libavformat 57. 56.100 / 57. 56.100
libavdevice 57. 1.100 / 57. 1.100
libavfilter 6. 65.100 / 6. 65.100
libavresample 3. 1. 0 / 3. 1. 0
libswscale 4. 2.100 / 4. 2.100
libswresample 2. 3.100 / 2. 3.100
libpostproc 54. 1.100 / 54. 1.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fbd8b808c00] Auto-inserting h264_mp4toannexb bitstream filter
Input #0, concat, from 'concat.txt':
Duration: N/A, start: 0.000000, bitrate: 38021 kb/s
Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 1696x848, 37832 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 180k tbc
Metadata:
creation_time : 2016-08-18T00:02:24.000000Z
handler_name : VideoHandle
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s
Metadata:
creation_time : 2016-08-18T00:02:24.000000Z
handler_name : SoundHandle
Output #0, mp4, to 'result.mp4':
Metadata:
encoder : Lavf57.56.100
Stream #0:0(eng): Video: h264 (Baseline) ([33][0][0][0] / 0x0021), yuv420p, 1696x848, q=2-31, 37832 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 90k tbc
Metadata:
creation_time : 2016-08-18T00:02:24.000000Z
handler_name : VideoHandle
Stream #0:1(eng): Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, 189 kb/s
Metadata:
creation_time : 2016-08-18T00:02:24.000000Z
handler_name : SoundHandle
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 112 fps=0.0 q=-1.0 size= 12701kB time=00:00:03.70 bitrate=28092.2kbits/s speed= 7.4x
frame= 151 fps=151 q=-1.0 size= 18853kB time=00:00:05.00 bitrate=30857.5kbits/s speed= 5x
frame= 224 fps=149 q=-1.0 size= 30042kB time=00:00:07.44 bitrate=33074.8kbits/s speed=4.95x
frame= 268 fps=134 q=-1.0 size= 36596kB time=00:00:08.90 bitrate=33650.8kbits/s speed=4.44x
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fbd8a808000] Auto-inserting h264_mp4toannexb bitstream filter.9x
[mp4 @ 0xb545d000] Non-monotonous DTS in output stream 0:1; previous: 484352, current: 445939; changing to 484353. This may result in incorrect timestamps in the output file.
[concat @ 0xb545c400] DTS 304057 < 906906 out of order
[mp4 @ 0xb545d000] Non-monotonous DTS in output stream 0:0; previous: 906906, current: 304057; changing to 906907. This may result in incorrect timestamps in the output file.
[mp4 @ 0xb545d000] Non-monotonous DTS in output stream 0:1; previous: 484353, current: 446963; changing to 484354. This may result in incorrect timestamps in the output file.
...
... like 100 DTS errors ...
...
[mp4 @ 0xb545d000] Non-monotonous DTS in output stream 0:0; previous: 907150, current: 548301; changing to 907151. This may result in incorrect timestamps in the output file.
frame= 548 fps=169 q=-1.0 Lsize= 148399kB time=00:00:18.28 bitrate=66493.7kbits/s speed=5.64x
video:148027kB audio:359kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.008622%
提前谢谢！
推荐答案
video2.mp4中的H.264比特流有些时髦
There's something funky about the H.264 bitstream in video2.mp4
下面的步骤(一次执行)将为我解决此问题，并且生成的concat可以在ffplay，Potplayer，VLC，WMP，Chrome和Firefox中正常运行.
The steps below (to be applied once) resolves it for me and the resulting concat plays fine with ffplay, Potplayer, VLC, WMP, Chrome and Firefox.
#1 转换视频2以匹配视频1
#1 Convert video 2 to match video 1
ffmpeg -i video2.mp4 -vf scale=1696x848 -profile:v baseline -c:a copy v2.mp4
#2 提取到原始比特流
ffmpeg -i v2.mp4 -c copy -f h264 v2.h264
#3 混合到新容器中
ffmpeg -i v2.h264 -i v2.mp4 -c copy -video_track_timescale 90000 -map 0 -map 1:a v2-ok.mp4
现在，您可以将v2-ok.mp4与video1.mp4连接了
Now, you can concat v2-ok.mp4 with video1.mp4
这篇关于FFmpeg-不同时基的Concat视频的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
