我正在尝试使用 更改从 NVR 获取的视频的容器ffmpeg，但输出视频无法通过 VLC 或 QuickTime 播放。输出视频保持静止。具体来说，使用以下命令：
ffmpeg -i input.avi -c:v copy output.mp4
我收到以下错误和警告消息：
ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
built with Apple clang version 11.0.0 (clang-1100.0.33.17)
configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.2_2 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
libavutil 56. 31.100 / 56. 31.100
libavcodec 58. 54.100 / 58. 54.100
libavformat 58. 29.100 / 58. 29.100
libavdevice 58. 8.100 / 58. 8.100
libavfilter 7. 57.100 / 7. 57.100
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 5.100 / 5. 5.100
libswresample 3. 5.100 / 3. 5.100
libpostproc 55. 5.100 / 55. 5.100
[h264 @ 0x7fc5aa810e00] missing picture in access unit with size 16
[h264 @ 0x7fc5aa810e00] No start code is found.
[h264 @ 0x7fc5aa810e00] Error splitting the input into NAL units.
[h264 @ 0x7fc5aa810e00] missing picture in access unit with size 16
[h264 @ 0x7fc5aa810e00] No start code is found.
[h264 @ 0x7fc5aa810e00] Error splitting the input into NAL units.
[h264 @ 0x7fc5aa810e00] missing picture in access unit with size 16
[h264 @ 0x7fc5aa810e00] No start code is found.
[h264 @ 0x7fc5aa810e00] Error splitting the input into NAL units.
[h264 @ 0x7fc5aa810e00] missing picture in access unit with size 16
...
Last message repeated 13 times
Input #0, avi, from 'input.avi':
Duration: 01:00:09.43, start: 0.000000, bitrate: 423 kb/s
Stream #0:0: Video: h264 (High) (H264 / 0x34363248), yuvj420p(pc, bt709, progressive), 1280x720, 418 kb/s, 30 fps, 30 tbr, 30 tbn, 60 tbc
Output #0, mp4, to 'output.mp4':
Metadata:
encoder : Lavf58.29.100
Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt709, progressive), 1280x720, q=2-31, 418 kb/s, 30 fps, 30 tbr, 1000k tbn, 30 tbc
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[mp4 @ 0x7fb18580a600] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
[NULL @ 0x7fb185000600] missing picture in access unit with size 16
Last message repeated 14 times
[NULL @ 0x7fb185000600] missing picture in access unit with size 8
[NULL @ 0x7fb185000600] missing picture in access unit with size 16
Last message repeated 35943 times
[NULL @ 0x7fb185000600] missing picture in access unit with size 16= 431.7kbits/s speed=3.99e+03x
Last message repeated 29061 times
frame=108284 fps=0.0 q=-1.0 Lsize= 183632kB time=01:00:09.39 bitrate= 416.8kbits/s speed=4.05e+03x
video:184216kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
这输入视频使用细节ffprobe如下：
{
"streams": [
{
"index": 0,
"codec_name": "h264",
"codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
"profile": "High",
"codec_type": "video",
"codec_time_base": "33333/2000000",
"codec_tag_string": "H264",
"codec_tag": "0x34363248",
"width": 1280,
"height": 720,
"coded_width": 1280,
"coded_height": 720,
"has_b_frames": 0,
"pix_fmt": "yuvj420p",
"level": 31,
"color_range": "pc",
"color_space": "bt709",
"color_transfer": "bt709",
"color_primaries": "bt709",
"chroma_location": "left",
"field_order": "progressive",
"refs": 1,
"is_avc": "false",
"nal_length_size": "0",
"r_frame_rate": "30/1",
"avg_frame_rate": "1000000/33333",
"time_base": "33333/1000000",
"start_pts": 0,
"start_time": "0.000000",
"duration_ts": 108284,
"duration": "3609.430572",
"bit_rate": "418103",
"bits_per_raw_sample": "8",
"nb_frames": "108284",
"disposition": {
"default": 0,
"dub": 0,
"original": 0,
"comment": 0,
"lyrics": 0,
"karaoke": 0,
"forced": 0,
"hearing_impaired": 0,
"visual_impaired": 0,
"clean_effects": 0,
"attached_pic": 0,
"timed_thumbnails": 0
}
}
],
"format": {
"filename": "input.avi",
"nb_streams": 1,
"nb_programs": 0,
"format_name": "avi",
"format_long_name": "AVI (Audio Video Interleaved)",
"start_time": "0.000000",
"duration": "3609.430572",
"size": "191260108",
"bit_rate": "423911",
"probe_score": 100
}
}
输出视频详情
{
"streams": [
{
"index": 0,
"codec_name": "h264",
"codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
"profile": "High",
"codec_type": "video",
"codec_time_base": "33333/2000000",
"codec_tag_string": "avc1",
"codec_tag": "0x31637661",
"width": 1280,
"height": 720,
"coded_width": 1280,
"coded_height": 720,
"has_b_frames": 0,
"pix_fmt": "yuvj420p",
"level": 31,
"color_range": "pc",
"color_space": "bt709",
"color_transfer": "bt709",
"color_primaries": "bt709",
"chroma_location": "left",
"refs": 1,
"is_avc": "true",
"nal_length_size": "4",
"r_frame_rate": "1000000/33333",
"avg_frame_rate": "1000000/33333",
"time_base": "1/1000000",
"start_pts": 0,
"start_time": "0.000000",
"duration_ts": 3609430572,
"duration": "3609.430572",
"bit_rate": "415792",
"bits_per_raw_sample": "8",
"nb_frames": "108284",
"disposition": {
"default": 1,
"dub": 0,
"original": 0,
"comment": 0,
"lyrics": 0,
"karaoke": 0,
"forced": 0,
"hearing_impaired": 0,
"visual_impaired": 0,
"clean_effects": 0,
"attached_pic": 0,
"timed_thumbnails": 0
},
"tags": {
"language": "und",
"handler_name": "VideoHandler"
}
}
],
"format": {
"filename": "cam4_03-14-20.mp4",
"nb_streams": 1,
"nb_programs": 0,
"format_name": "mov,mp4,m4a,3gp,3g2,mj2",
"format_long_name": "QuickTime / MOV",
"start_time": "0.000000",
"duration": "3609.431000",
"size": "188039397",
"bit_rate": "416773",
"probe_score": 100,
"tags": {
"major_brand": "isom",
"minor_version": "512",
"compatible_brands": "isomiso2avc1mp41",
"encoder": "Lavf58.29.100"
}
}
}
关于如何在不重新编码的情况下更改容器有什么建议吗？
答案1
您使用选项-c:v。它通常用于重新编码视频。
使用方法如下：
ffmpeg -i input.avi output.mp4