我的文件夹中有多个视频，但是当第一个视频没有音频流时，音频会在连接的视频中消失。如果第一个视频有音频流，则连接的视频是正确的。我怎样才能连接视频而不丢失音频。有人能帮我吗？提前谢谢。
这是我的一段连接代码
ffmpeg -f concat -i "1.txt" -c copy $OUTPUT_FILE
其中“1.txt”文件包含要连接的视频列表
如果没有音频，我可以通过在第一个视频中添加静音音频来省略它，但也许有人知道更好的方法？
第一个视频信息（来自 mplayer）：
VIDEO: [H264] 1920x1080 24bpp 30.000 fps 3691.0 kbps (450.6 kbyte/s)
Clip info:
major_brand: isom
minor_version: 512
compatible_brands: isomiso2avc1mp41
encoder: Lavf56.30.100
Load subtitles in ./
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
libavcodec version 54.92.100 (external)
Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264)
==========================================================================
Audio: no sound
第二个视频信息：
VIDEO: [H264] 1920x1080 24bpp 30.000 fps 2761.4 kbps (337.1 kbyte/s)
Clip info:
major_brand: isom
minor_version: 512
compatible_brands: isomiso2avc1mp41
encoder: Lavf56.30.100
Load subtitles in ./
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
libavcodec version 54.92.100 (external)
Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264)
==========================================================================
==========================================================================
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
AUDIO: 44100 Hz, 2 ch, floatle, 128.0 kbit/4.53% (ratio: 15998->352800)
Selected audio codec: [ffaac] afm: ffmpeg (FFmpeg AAC (MPEG-2/MPEG-4 Audio))
第一个视频的 ffmpeg 输出
ffmpeg version 2.6.git Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 4.8.3 (GCC) 20140911 (Red Hat 4.8.3-7)
configuration: --prefix=/root/ffmpeg_build --extra-cflags=-I/root/ffmpeg_build/include --extra-ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --enable-gpl --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree
libavutil 54. 23.101 / 54. 23.101
libavcodec 56. 35.101 / 56. 35.101
libavformat 56. 30.100 / 56. 30.100
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 14.100 / 5. 14.100
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 3.100 / 53. 3.100
Input #0, image2, from '10000_full_400511img002.jpg':
Duration: 00:00:00.04, start: 0.000000, bitrate: 58229 kb/s
Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
[swscaler @ 0x39560e0] deprecated pixel format used, make sure you did set range correctly
[libx264 @ 0x396cb60] -qscale is ignored, -crf is recommended.
[libx264 @ 0x396cb60] using SAR=1/1
[libx264 @ 0x396cb60] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
[libx264 @ 0x396cb60] profile High, level 4.0
[libx264 @ 0x396cb60] 264 - core 130 r2282 1db4621 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - 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=6 lookahead_threads=1 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
Output #0, mp4, to 'test_output.mp4':
Metadata:
encoder : Lavf56.30.100
Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 30 fps, 15360 tbn, 30 tbc
Metadata:
encoder : Lavc56.35.101 libx264
Stream mapping:
Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Press [q] to stop, [?] for help
frame= 60 fps= 16 q=-1.0 Lsize= 324kB time=00:00:01.93 bitrate=1374.8kbits/s
video:323kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.471130%
[libx264 @ 0x396cb60] frame I:1 Avg QP:18.03 size:321845
[libx264 @ 0x396cb60] frame P:15 Avg QP:16.15 size: 338
[libx264 @ 0x396cb60] frame B:44 Avg QP:13.72 size: 70
[libx264 @ 0x396cb60] consecutive B-frames: 1.7% 0.0% 5.0% 93.3%
[libx264 @ 0x396cb60] mb I I16..4: 10.1% 89.7% 0.3%
[libx264 @ 0x396cb60] mb P I16..4: 0.0% 0.0% 0.0% P16..4: 1.6% 0.0% 0.0% 0.0% 0.0% skip:98.4%
[libx264 @ 0x396cb60] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 0.0% 0.0% 0.0% direct: 0.0% skip:100.0% L0:49.1% L1:50.9% BI: 0.0%
[libx264 @ 0x396cb60] 8x8 transform intra:89.4% inter:99.1%
[libx264 @ 0x396cb60] coded y,uvDC,uvAC intra: 88.8% 88.3% 80.7% inter: 0.0% 0.4% 0.0%
[libx264 @ 0x396cb60] i16 v,h,dc,p: 98% 0% 2% 0%
[libx264 @ 0x396cb60] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 14% 21% 19% 6% 7% 6% 9% 8% 11%
[libx264 @ 0x396cb60] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 7% 18% 10% 7% 13% 9% 16% 6% 14%
[libx264 @ 0x396cb60] i8c dc,h,v,p: 53% 17% 16% 13%
[libx264 @ 0x396cb60] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x396cb60] ref P L0: 93.4% 0.0% 3.7% 2.8%
[libx264 @ 0x396cb60] ref B L0: 52.8% 45.3% 1.9%
[libx264 @ 0x396cb60] kb/s:1320.02
然后我制作了相同的第二个视频，并将其与音频连接起来：
ffmpeg version 2.6.git Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 4.8.3 (GCC) 20140911 (Red Hat 4.8.3-7)
configuration: --prefix=/root/ffmpeg_build --extra-cflags=-I/root/ffmpeg_build/include --extra-ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --enable-gpl --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree
libavutil 54. 23.101 / 54. 23.101
libavcodec 56. 35.101 / 56. 35.101
libavformat 56. 30.100 / 56. 30.100
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 14.100 / 5. 14.100
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 3.100 / 53. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test_output.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf56.30.100
Duration: 00:00:02.00, start: 0.000000, bitrate: 1329 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 1322 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
Metadata:
handler_name : VideoHandler
Input #1, mp3, from 'audio.mp3':
Metadata:
title : Time (zaycev.net)
artist : ONUKA
encoder : Lavf56.30.100
Duration: 00:00:02.01, start: 0.011995, bitrate: 130 kb/s
Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
Metadata:
encoder : Lavc56.35
[mp4 @ 0x2c67040] Codec for stream 0 does not use global headers but container format requires global headers
Output #0, mp4, to 'final.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf56.30.100
Stream #0:0(und): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 1322 kb/s, 30 fps, 30 tbr, 15360 tbn, 15360 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo, fltp, 128 kb/s
Metadata:
encoder : Lavc56.35.101 aac
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #1:0 -> #0:1 (mp3 (native) -> aac (native))
Press [q] to stop, [?] for help
frame= 60 fps=0.0 q=-1.0 Lsize= 359kB time=00:00:02.02 bitrate=1454.4kbits/s
video:323kB audio:32kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.959931%
之后，我连接了两个视频并得到了输出。当第一个视频没有音频时，ffmpeg 程序输出：
ffmpeg version 2.6.git Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 4.8.3 (GCC) 20140911 (Red Hat 4.8.3-7)
configuration: --prefix=/root/ffmpeg_build --extra-cflags=-I/root/ffmpeg_build/include --extra-ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --enable-gpl --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree
libavutil 54. 23.101 / 54. 23.101
libavcodec 56. 35.101 / 56. 35.101
libavformat 56. 30.100 / 56. 30.100
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 14.100 / 5. 14.100
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 3.100 / 53. 3.100
Input #0, concat, from '1.txt':
Duration: N/A, start: 0.000000, bitrate: 3691 kb/s
Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 3691 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc
[mp4 @ 0x2b5e580] Codec for stream 0 does not use global headers but container format requires global headers
Output #0, mp4, to 'final.mp4':
Metadata:
encoder : Lavf56.30.100
Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 3691 kb/s, 30 fps, 30 tbr, 90k tbn, 90k tbc
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[concat @ 0x2b501c0] New audio stream 0:1 at pos:259207 and DTS:12.267s
frame= 824 fps=0.0 q=-1.0 Lsize= 10660kB time=00:00:27.39 bitrate=3188.2kbits/s
video:10651kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.088069%
答案1
所有文件必须具有相同的流（相同的编解码器、相同的时间基准等）。
注意的文档concat 筛选有类似的要求：
该过滤器适用于同步视频和音频流的片段。所有片段必须具有相同数量的每种类型的流，并且这也是输出的流数量。
这里的诀窍是，为了使您的concat操作正常工作，音频流必须存在于第一个“静音”视频文件中，以便音频编码器可以在整个连接编码过程中使用。您可以在创建第一个文件时使用aevalsrc值为 的音频源添加静音音频流0：
ffmpeg \
-f image2 -i [your image-set name info here] \
-f lavfi -i aevalsrc=0 \
-map 0 -map 1 -shortest \
-c:v libx264 [your X264 params here, same settings as in your 2nd file to concat] \
-c:a aac -strict experimental [your aac params here, same settings as in your 2nd file] \
/path/to/output/file/output_file.mp4