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Дмитрий
Asked: 2024-08-28 03:21:18 +0800 CST

我在 ffmpeg 中错误地指定了命令的参数

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[out#0/dash @ 0x55eee3309600] Codec AVOption minrate (minimum bitrate (in bits/s). Most useful in setting up a CBR encode. It is of little use otherwise.) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
[out#0/dash @ 0x55eee3309600] Codec AVOption threads (set the number of threads) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
[out#0/dash @ 0x55eee3309600] Codec AVOption maxrate (maximum bitrate (in bits/s). Used for VBV together with bufsize.) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
Stream mapping:
  Stream #0:0 -> #0:0 (av1 (libdav1d) -> vp9 (libvpx-vp9))
  Stream #0:1 -> #0:1 (opus (native) -> opus (libopus))
Press [q] to stop, [?] for help
[libvpx-vp9 @ 0x55eee3356500] v1.11.0
[libvpx-vp9 @ 0x55eee3356500] Neither bitrate nor constrained quality specified, using default CRF of 32
[dash @ 0x55eee330c440] No bit rate set for stream 0

我的命令有什么问题？

我是否错误地标示了最高和最低费率？

ffmpeg -i /2160.mp4 -deadline best -speed 1 -movflags +faststart -map_metadata -1 
         -c:a libopus -b:a 128k -ar 48000 
         -c:v libvpx-vp9 -pix_fmt yuv420p -keyint_min 150 -g 240 -tile-columns 4 -frame-parallel 1 
         -map 0:v:0 -map 0:a:0 
         -filter:v:2 scale=-2:360,fps=30 -minrate:v:2 138k -b:v:2 276k -maxrate:v:2 400k    -tile-columns:v:2 1 -threads:v:2 4  
         -init_seg_name "init-\$RepresentationID\$.\$ext\$" 
         -media_seg_name "chunk-\$RepresentationID\$-\$Number%05d\$.\$ext\$" 
         -dash_segment_type webm 
         -use_template 1 -use_timeline 1 -seg_duration 10 
         -adaptation_sets "id=0,streams=v id=1,streams=a" 
         -f dash /test/dash.mpd
ffmpeg

1 个回答

  1. Best Answer

    您正在使用 来过滤/设置第二个流的最小-最大速率v:2，您可能需要将其更改为 以适用于流 0（主视频流，如 中所示map 0:v:0）v:0。

    完整命令如下：

    ffmpeg -i /2160.mp4 -deadline best -speed 1 -movflags +faststart -map_metadata -1 \
       -c:a libopus -b:a 128k -ar 48000 \
       -c:v libvpx-vp9 -pix_fmt yuv420p -keyint_min 150 -g 240 -tile-columns 4 -frame-parallel 1 \
       -map 0:v:0 -map 0:a:0 \
       -filter:v:0 scale=-2:360,fps=30 -minrate:v:0 138k -b:v:0 276k -maxrate:v:0 400k -tile-columns:v:0 1 -threads:v:0 4 \
       -init_seg_name "init-\$RepresentationID\$.\$ext\$" \
       -media_seg_name "chunk-\$RepresentationID\$-\$Number%05d\$.\$ext\$" \
       -dash_segment_type webm \
       -use_template 1 -use_timeline 1 -seg_duration 10 \
       -adaptation_sets "id=0,streams=v id=1,streams=a" \
       -f dash /test/dash.mpd
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