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FFMPEG - 非單調 DTS

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FFMPEG - 非單調 DTS

當我使用 FFMPEG 將影片從 MP4 轉換為 M3U8 時，請使用以下命令，

ffmpeg -i op.mp4  -b:v 128k -flags -global_header -map 0:0 -map 0:1 -f segment -segment_time 4 -segment_list_size 0 -segment_list op.m3u8 -segment_format mpegts op%05d.ts

我收到以下警告：

Non-monotonous DTS in output stream 0:1; previous: 347527, current: 346508; changing to 347528. This may result in incorrect timestamps in the output file.

M3U8 已生成，但 Quicktime 播放器上僅出現音訊。

樣品 MP4 和 M3U8 均可使用這裡

所以，我想知道

  1. 此錯誤背後的原因。是 MP4 損壞還是轉換過程中出現問題。 m3u8 可以播放，但無法在 Quicktime 上正常播放。只有音訊出現，沒有視訊。

  2. 我怎麼能解決這個問題

完整的 FFMPEG 控制台輸出：

ffmpeg version git-2013-06-06-c51654f Copyright (c) 2000-2013 the FFmpeg developers
  built on Jun  6 2013 12:54:24 with gcc 4.6.3 (GCC) 20120306 (Red Hat 4.6.3-2)
  configuration: --prefix=/root/ffmpeg_build --extra-cflags=-I/root/ffmpeg_build/include --extra-ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --extra-libs=-ldl --enable-gpl --enable-nonfree --enable-libfdk_aac --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264
  libavutil      52. 35.100 / 52. 35.100
  libavcodec     55. 15.100 / 55. 15.100
  libavformat    55.  8.102 / 55.  8.102
  libavdevice    55.  2.100 / 55.  2.100
  libavfilter     3. 75.101 /  3. 75.101
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'op.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf55.8.102
  Duration: 00:00:06.00, start: 0.010000, bitrate: 679 kb/s
    Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 640x364 [SAR 1:1 DAR 160:91], 590 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 130 kb/s
    Metadata:
      handler_name    : SoundHandler
[segment @ 0x32e1d60] Codec for stream 0 does not use global headers but container format requires global headers
[segment @ 0x32e1d60] Codec for stream 1 does not use global headers but container format requires global headers
Output #0, segment, to 'op%05d.ts':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf55.8.102
    Stream #0:0(eng): Video: mpeg2video, yuv420p, 640x364 [SAR 1:1 DAR 160:91], q=2-31, 128 kb/s, 90k tbn, 25 tbc
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: mp2, 44100 Hz, stereo, s16, 128 kb/s
    Metadata:
      handler_name    : SoundHandler
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> mpeg2video)
  Stream #0:1 -> #0:1 (aac -> mp2)
Press [q] to stop, [?] for help
[segment @ 0x32e1d60] Non-monotonous DTS in output stream 0:1; previous: 347527, current: 346508; changing to 347528. This may result in incorrect timestamps in the output file.
frame=  109 fps=0.0 q=31.0 size=N/A time=00:00:04.29 bitrate=N/A dup=14 drop=0  frame=  151 fps=0.0 q=24.8 Lsize=N/A time=00:00:06.00 bitrate=N/A dup=14 drop=0    
video:350kB audio:96kB subtitle:0 global headers:0kB muxing overhead -100.004823%

使用垂直同步和非同步選項時，出現的錯誤是「流 0 的編解碼器不使用全域標頭，但容器格式需要全域標頭」。這是控制台輸出：

ffmpeg -i op.mp4  -b:v 128k -flags -global_header -map 0:0 -map 0:1 -f segment -segment_time 4 -segment_list_size 0 -segment_list nop.m3u8 -segment_format mpegts nop%05d.ts  
ffmpeg version git-2013-06-06-c51654f Copyright (c) 2000-2013 the FFmpeg developers
  built on Jun  6 2013 12:54:24 with gcc 4.6.3 (GCC) 20120306 (Red Hat 4.6.3-2)
  configuration: --prefix=/root/ffmpeg_build --extra-cflags=-I/root/ffmpeg_build/include --extra-ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --extra-libs=-ldl --enable-gpl --enable-nonfree --enable-libfdk_aac --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264
  libavutil      52. 35.100 / 52. 35.100
  libavcodec     55. 15.100 / 55. 15.100
  libavformat    55.  8.102 / 55.  8.102
  libavdevice    55.  2.100 / 55.  2.100
  libavfilter     3. 75.101 /  3. 75.101
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'op.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf55.8.102
  Duration: 00:00:06.00, start: 0.010000, bitrate: 679 kb/s
    Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 640x364 [SAR 1:1 DAR 160:91], 590 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 130 kb/s
    Metadata:
      handler_name    : SoundHandler
[segment @ 0x3bf3d60] Codec for stream 0 does not use global headers but container format requires global headers
[segment @ 0x3bf3d60] Codec for stream 1 does not use global headers but container format requires global headers
Output #0, segment, to 'nop%05d.ts':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf55.8.102
    Stream #0:0(eng): Video: mpeg2video, yuv420p, 640x364 [SAR 1:1 DAR 160:91], q=2-31, 128 kb/s, 90k tbn, 25 tbc
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: mp2, 44100 Hz, stereo, s16, 128 kb/s
    Metadata:
      handler_name    : SoundHandler
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> mpeg2video)
  Stream #0:1 -> #0:1 (aac -> mp2)
Press [q] to stop, [?] for help
[segment @ 0x3bf3d60] Non-monotonous DTS in output stream 0:1; previous: 347527, current: 346508; changing to 347528. This may result in incorrect timestamps in the output file.
frame=  119 fps=0.0 q=31.0 size=N/A time=00:00:04.68 bitrate=N/A dup=14 drop=0  frame=  151 fps=0.0 q=24.8 Lsize=N/A time=00:00:06.00 bitrate=N/A dup=14 drop=0    
video:350kB audio:96kB subtitle:0 global headers:0kB muxing overhead -100.004823%

答案1

您的 CSI 剪輯也使用非單調的 DTS 訊息進行轉換。我能夠在 VLC 中正常播放 MP4 剪輯，但 ffplay 最後出現問題。我不確定這是什麼意思。

ffmpeg -i op.mp4 -b:v 128k -flags -global_header -map 0:0 -map 0:1 -f segment -segment_time 4 -segment_list_size 0 -segment_list op.m3u8 -segment_format mpegts op%05d.ts

只需取得較新版本ffmpeg。你的是2013年6月的。我在 VLC 上播放 MP4 效果很好。各個 .ts 檔案對我來說也播放得很好。

C:\temp>dir op*
 Volume in drive C has no label.
 Volume Serial Number is xxx-xxx

 Directory of C:\temp

10/07/2014  08:52 PM               169 op.m3u8
10/07/2014  08:51 PM           509,425 op.mp4
10/07/2014  08:52 PM           404,764 op00000.ts
10/07/2014  08:52 PM           148,520 op00001.ts
               4 File(s)      1,062,878 bytes

op.m3u8 以 4 秒為增量建立段，直到檔案完全處理。

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-ALLOW-CACHE:YES
#EXT-X-TARGETDURATION:5
#EXTINF:4.120000,
op00000.ts
#EXTINF:1.960000,
op00001.ts
#EXT-X-ENDLIST

答案2

該 mp4 僅 6 秒長，且音訊串流與視訊的長度不同，但我能夠透過執行以下操作來同步兩者並消除 DTS 錯誤：

ffmpeg -i op.mp4 -ss 00:00:00.11 -t 00:00:06.00 -vn -y op.wav

ffmpeg -i op.mp4 -ss 0.010000 -t 00:00:06 -vcodec rawvideo -an -y op.avi

ffmpeg -i op.avi -i op.wav -b:v 590k -b:a 130k -t 00:00:06 -y op_fixed.mp4

這基本上重新創建了 mp4 並修復了一些小的損壞問題，同時使兩個流的長度相同。

另外，您的命令列不需要兩個 -map 參數，而且原始 mp4 中的編解碼器都不支援全域標頭，除此之外，我不認為您需要它們。完成上面列出的步驟後，以下內容應該完成且不會出現錯誤：

ffmpeg -i op_fixed.mp4 -b:v 128k -f segment -segment_time 4 -segment_list_size 0 -segment_list op.m3u8 -segment_format mpegts op%05d.ts

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