Tôi muốn ghép hai tệp flv (được tải xuống từ Youtube.com) bằng các công cụ dòng lệnh của Linux.
Các ffmpeghướng dẫn là quá phức tạp, vì vậy tôi đã cố gắng mencodehướng dẫn .
Nhưng tôi nhận được một đầu ra trống. Tôi không biết làm thế nào để khắc phục vấn đề.
ffmpeg -i input_1.flv
ffmpeg version 0.8.1-4:0.8.1-0ubuntu1, Copyright (c) 2000-2011 the Libav developers
built on Mar 22 2012 05:29:10 with gcc 4.6.3
This program is not developed anymore and is only provided for compatibility. Use avconv instead (see Changelog for the list of incompatible changes).
[flv @ 0x89faaa0] Estimating duration from bitrate, this may be inaccurate
Seems stream 0 codec frame rate differs from container frame rate: 59.94 (2997/50) -> 29.97 (30000/1001)
Input #0, flv, from 'input_1.flv':
Metadata:
starttime : 0
totalduration : 173
totaldatarate : 457
bytelength : 9874241
canseekontime : true
sourcedata : B4A7D6704MH1334385311768958
purl :
pmsg :
Duration: 00:02:52.83, start: 0.000000, bitrate: 459 kb/s
Stream #0.0: Video: h264 (Main), yuv420p, 640x360 [PAR 1:1 DAR 16:9], 360 kb/s, 29.97 tbr, 1k tbn, 59.94 tbc
Stream #0.1: Audio: aac, 44100 Hz, stereo, s16, 99 kb/s
At least one output file must be specified
ffmpeg -i input_2.flv
ffmpeg version 0.8.1-4:0.8.1-0ubuntu1, Copyright (c) 2000-2011 the Libav developers
built on Mar 22 2012 05:29:10 with gcc 4.6.3
This program is not developed anymore and is only provided for compatibility. Use avconv instead (see Changelog for the list of incompatible changes).
[flv @ 0x85b7aa0] Estimating duration from bitrate, this may be inaccurate
Seems stream 0 codec frame rate differs from container frame rate: 59.94 (2997/50) -> 29.97 (30000/1001)
Input #0, flv, from 'input_2.flv':
Metadata:
starttime : 0
totalduration : 488
totaldatarate : 254
bytelength : 15467674
canseekontime : true
sourcedata : BADC21903MH1334385484128583
purl :
pmsg :
Duration: 00:08:07.54, start: 0.000000, bitrate: 250 kb/s
Stream #0.0: Video: h264 (Main), yuv420p, 640x360 [PAR 1:1 DAR 16:9], 151 kb/s, 29.97 tbr, 1k tbn, 59.94 tbc
Stream #0.1: Audio: aac, 44100 Hz, stereo, s16, 99 kb/s
At least one output file must be specified
mencoder -of lavf -oac copy -ovc copy -o output.flv input_1.flv input_2.flv
MEncoder svn r34540 (Ubuntu), built with gcc-4.6 (C) 2000-2012 MPlayer Team
success: format: 0 data: 0x0 - 0x96ab41
libavformat version 53.21.0 (external)
Mismatching header version 53.19.0
libavformat file format detected.
[flv @ 0xb6b09d80]Estimating duration from bitrate, this may be inaccurate
[lavf] stream 0: video (h264), -vid 0
[lavf] stream 1: audio (aac), -aid 0
VIDEO: [H264] 640x360 0bpp 29.970 fps 360.0 kbps (43.9 kbyte/s)
[V] filefmt:44 fourcc:0x34363248 size:640x360 fps:29.970 ftime:=0.0334
** MUXER_LAVF *****************************************************************
REMEMBER: MEncoder's libavformat muxing is presently broken and can generate
INCORRECT files in the presence of B-frames. Moreover, due to bugs MPlayer
will play these INCORRECT files as if nothing were wrong!
*******************************************************************************
OK, exit.
videocodec: framecopy (640x360 0bpp fourcc=34363248)
Audio format 0x4134504d is incompatible with '-oac copy', please try '-oac pcm' instead or use '-fafmttag' to override it.
Exiting...
mencoder -of lavf -oac pcm -ovc copy -o output.flv input_1.flv input_2.flv
MEncoder svn r34540 (Ubuntu), built with gcc-4.6 (C) 2000-2012 MPlayer Team
success: format: 0 data: 0x0 - 0x96ab41
libavformat version 53.21.0 (external)
Mismatching header version 53.19.0
libavformat file format detected.
[flv @ 0xb6bb6d80]Estimating duration from bitrate, this may be inaccurate
[lavf] stream 0: video (h264), -vid 0
[lavf] stream 1: audio (aac), -aid 0
VIDEO: [H264] 640x360 0bpp 29.970 fps 360.0 kbps (43.9 kbyte/s)
[V] filefmt:44 fourcc:0x34363248 size:640x360 fps:29.970 ftime:=0.0334
==========================================================================
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
libavcodec version 53.35.0 (external)
Mismatching header version 53.32.2
AUDIO: 44100 Hz, 2 ch, s16le, 99.0 kbit/7.02% (ratio: 12376->176400)
Selected audio codec: [ffaac] afm: ffmpeg (FFmpeg AAC (MPEG-2/MPEG-4 Audio))
==========================================================================
** MUXER_LAVF *****************************************************************
REMEMBER: MEncoder's libavformat muxing is presently broken and can generate
INCORRECT files in the presence of B-frames. Moreover, due to bugs MPlayer
will play these INCORRECT files as if nothing were wrong!
*******************************************************************************
OK, exit.
videocodec: framecopy (640x360 0bpp fourcc=34363248)
VIDEO CODEC ID: 28
AUDIO CODEC ID: 2e, TAG: 0
Writing header...
[flv @ 0xb6bb6d80]Codec for stream 0 does not use global headers but container format requires global headers
[flv @ 0xb6bb6d80]Codec for stream 1 does not use global headers but container format requires global headers
[NULL @ 0xb6472380]codec not compatible with flv
Floating point exception (core dumped)
stat output.flv
File: `output.flv'
Size: 0 Blocks: 0 IO Block: 4096 regular empty file
Device: 700h/1792d Inode: 1722857 Links: 1
Access: (0664/-rw-rw-r--) Uid: ( 1000/ kev) Gid: ( 1000/ kev)
Access: 2012-05-04 10:44:45.153319669 +0800
Modify: 2012-05-04 10:44:45.153319669 +0800
Change: 2012-05-04 10:44:45.153319669 +0800
Birth: -
mencoder -forceidx -of lavf -oac copy -ovc copy -o output.flv clip1.flv clip2.flv clip3.flvnguồn