AVI 파일을 MP4 파일로 변환하려고합니다. 비디오 스트림은 XVID 인 반면 오디오 스트림은 MP3입니다.
문제는 결과 MP4 파일을 Mac의 QuickTime Player에서 재생할 수 없다는 것입니다. VLC에서 재생됩니다. 그것은 거래를 깨는 사람이 아니지만 그러한 문제를 일으키는 방법을 알고 싶습니다.
명령과 출력은 다음과 같습니다.
$ ffmpeg -i 103.avi -codec copy -f mp4 103.mp4
ffmpeg version N-60163-g78a9f18 Copyright (c) 2000-2014 the FFmpeg developers
built on Jan 25 2014 14:03:47 with Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)
configuration:
libavutil 52. 63.100 / 52. 63.100
libavcodec 55. 49.100 / 55. 49.100
libavformat 55. 26.100 / 55. 26.100
libavdevice 55. 5.102 / 55. 5.102
libavfilter 4. 1.101 / 4. 1.101
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 17.104 / 0. 17.104
Input #0, avi, from '103.avi':
Metadata:
encoder : Lavf55.26.100
Duration: 00:49:36.43, start: 0.000000, bitrate: 986 kb/s
Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 512x368 [SAR 1:1 DAR 32:23], 23.98 tbr, 23.98 tbn, 23.98 tbc
Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 121 kb/s
Output #0, mp4, to '103.mp4':
Metadata:
encoder : Lavf55.26.100
Stream #0:0: Video: mpeg4 ( [0][0][0] / 0x0020), yuv420p, 512x368 [SAR 1:1 DAR 32:23], q=2-31, 11988 tbn, 23.98 tbc
Stream #0:1: Audio: mp3 (i[0][0][0] / 0x0069), 48000 Hz, stereo, 121 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
[mp4 @ 0x7fe5ca01fa00] pts has no value
Last message repeated 1555 times
[mp4 @ 0x7fe5ca01fa00] pts has no value9kB time=00:01:17.70 bitrate=1458.0kbits/s
Last message repeated 1041 times
[mp4 @ 0x7fe5ca01fa00] pts has no value49kB time=00:02:08.42 bitrate=1661.6kbits/s
Last message repeated 1906 times
[mp4 @ 0x7fe5ca01fa00] pts has no value53kB time=00:03:40.39 bitrate=1537.1kbits/s
Last message repeated 2136 times
[mp4 @ 0x7fe5ca01fa00] pts has no value93kB time=00:05:35.80 bitrate=1307.4kbits/s
Last message repeated 3519 times
[mp4 @ 0x7fe5ca01fa00] pts has no value32kB time=00:08:32.18 bitrate=1150.5kbits/s
Last message repeated 2813 times
[mp4 @ 0x7fe5ca01fa00] pts has no value88kB time=00:11:18.01 bitrate=1090.9kbits/s
Last message repeated 3057 times
[mp4 @ 0x7fe5ca01fa00] pts has no value39kB time=00:14:00.42 bitrate=1028.7kbits/s
Last message repeated 3731 times
[mp4 @ 0x7fe5ca01fa00] pts has no value11kB time=00:16:57.72 bitrate= 991.0kbits/s
Last message repeated 2658 times
[mp4 @ 0x7fe5ca01fa00] pts has no value76kB time=00:19:25.70 bitrate= 978.1kbits/s
Last message repeated 2167 times
[mp4 @ 0x7fe5ca01fa00] pts has no value70kB time=00:21:17.11 bitrate= 990.8kbits/s
Last message repeated 3663 times
[mp4 @ 0x7fe5ca01fa00] pts has no value20kB time=00:24:42.06 bitrate= 938.1kbits/s
Last message repeated 2335 times
[mp4 @ 0x7fe5ca01fa00] pts has no value79kB time=00:26:53.90 bitrate= 950.6kbits/s
Last message repeated 4153 times
[mp4 @ 0x7fe5ca01fa00] pts has no value06kB time=00:30:59.94 bitrate= 895.4kbits/s
Last message repeated 3168 times
[mp4 @ 0x7fe5ca01fa00] pts has no value87kB time=00:33:35.43 bitrate= 888.5kbits/s
Last message repeated 1565 times
[mp4 @ 0x7fe5ca01fa00] pts has no value02kB time=00:34:56.47 bitrate= 914.0kbits/s
Last message repeated 2792 times
[mp4 @ 0x7fe5ca01fa00] pts has no value10kB time=00:37:34.42 bitrate= 909.6kbits/s
Last message repeated 2503 times
[mp4 @ 0x7fe5ca01fa00] pts has no value49kB time=00:39:48.76 bitrate= 916.2kbits/s
Last message repeated 1714 times
[mp4 @ 0x7fe5ca01fa00] pts has no value70kB time=00:41:16.64 bitrate= 928.7kbits/s
Last message repeated 2060 times
[mp4 @ 0x7fe5ca01fa00] pts has no value79kB time=00:43:04.79 bitrate= 935.2kbits/s
Last message repeated 1349 times
[mp4 @ 0x7fe5ca01fa00] pts has no value46kB time=00:44:06.57 bitrate= 951.6kbits/s
Last message repeated 2354 times
[mp4 @ 0x7fe5ca01fa00] pts has no value67kB time=00:45:56.33 bitrate= 967.9kbits/s
Last message repeated 2668 times
[mp4 @ 0x7fe5ca01fa00] pts has no value50kB time=00:48:14.72 bitrate= 964.9kbits/s
Last message repeated 1655 times
frame=71363 fps=5738 q=-1.0 Lsize= 355528kB time=00:49:36.43 bitrate= 978.5kbits/s
video:309630kB audio:44196kB subtitle:0 global headers:0kB muxing overhead 0.481011%
그런 다음 mp4를 다시 복사하면 다음과 같은 결과가 나타납니다.
$ ffmpeg -i 103.mp4 -codec copy -f mp4 103-new.mp4
ffmpeg version N-60163-g78a9f18 Copyright (c) 2000-2014 the FFmpeg developers
built on Jan 25 2014 14:03:47 with Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)
configuration:
libavutil 52. 63.100 / 52. 63.100
libavcodec 55. 49.100 / 55. 49.100
libavformat 55. 26.100 / 55. 26.100
libavdevice 55. 5.102 / 55. 5.102
libavfilter 4. 1.101 / 4. 1.101
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 17.104 / 0. 17.104
[mpeg4 @ 0x7fcddb018000] Video uses a non-standard and wasteful way to store B-frames ('packed B-frames'). Consider using a tool like VirtualDub or avidemux to fix it.
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '103.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
encoder : Lavf55.26.100
Duration: 00:49:36.44, start: 0.000000, bitrate: 978 kb/s
Stream #0:0(und): Video: mpeg4 (Advanced Simple Profile) (mp4v / 0x7634706D), yuv420p, 512x368 [SAR 1:1 DAR 32:23], 852 kb/s, 23.98 fps, 23.98 tbr, 11988 tbn, 23.98 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: mp3 (mp4a / 0x6134706D), 48000 Hz, stereo, s16p, 121 kb/s (default)
Metadata:
handler_name : SoundHandler
Output #0, mp4, to '103-new.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
encoder : Lavf55.26.100
Stream #0:0(und): Video: mpeg4 ( [0][0][0] / 0x0020), yuv420p, 512x368 [SAR 1:1 DAR 32:23], q=2-31, 852 kb/s, 23.98 fps, 11988 tbn, 11988 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: mp3 (i[0][0][0] / 0x0069), 48000 Hz, stereo, 121 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame=71363 fps=5505 q=-1.0 Lsize= 355528kB time=00:49:36.43 bitrate= 978.5kbits/s
video:309567kB audio:44196kB subtitle:0 global headers:0kB muxing overhead 0.498835%
답변
먼저,이 오류가 존재하는 이유에 대한 배경. AVI는 가변 프레임 속도 비디오를 지원하지 않습니다. 따라서 파일 시작 부분의 프레임 속도가 기록됩니다. mp4는 가변 프레임 속도를 지원하므로 각 프레임의 지속 시간을 알아야합니다. ffmpeg에서 고정 프레임 레이트 비디오에 대한 pts 생성은 일반적으로 디코더에 의해 처리됩니다. 그러나를 사용 -codec copy하면 디코더를 무시합니다.
솔루션이 지정 중입니다 -fflags +genpts(입력 파일을로 지정하기 전에해야 함 -i).
답변
프레임 속도를 하드 코딩하면이 문제가 해결되었습니다.
ffmpeg -r 25 -i test.h264 -codec copy testout25.mp4
(여전히 “스트림 0의 패킷에 타임 스탬프가 설정되어 있지 않습니다”라는 경고가 표시되지만 결과 파일은 Mac의 Quicktime Player에서 찾을 수 있습니다.)