我希望使用VLC执行自适应比特率流传输。我使用的方法是使用USB摄像机捕获视频，对其进行编码并创建具有不同比特率的MPD文件，以便VLC能够根据带宽质量在客户端计算机上流式传输视频。但是，当我尝试使用“ http://IPaddress:80/mpd_file.mpd”播放MPD文件时，VLC无法在带宽之间切换。
这是MPD文件的一部分
<Representation id="v1" mimeType="video/mp4" codecs="avc1.42C01E" width="3840" height="2160" frameRate="30" sar="1:1" startWithSAP="1" bandwidth="6000000.000000">
</Representation>
<Representation id="v2" mimeType="video/mp4" codecs="avc1.42C01E" width="1920" height="1080" frameRate="30" sar="1:1" startWithSAP="1" bandwidth="8000000.000000">
</Representation>
以下是我尝试将带宽从6 Mbps切换到8 Mbps时在VLC中收到的日志消息
main debug: using opengl module "egl_x11"
main debug: looking for glconv module matching "any": 3 candidates
glconv_vaapi_x11 error: vaInitialize: unknown libva error
main debug: using glconv module "glconv_vaapi_drm"
main debug: using vout display module "gl"
main debug: original format sz 3840x2160, of (0,0), vsz 3840x2160, 4cc VAOP, sar 1:1, msk r0x0 g0x0 b0x0
main debug: removing module "freetype"
main debug: looking for text renderer module matching "any": 3 candidates
freetype debug: Building font databases.
freetype debug: Took -11968 microseconds
main debug: using text renderer module "freetype"
main debug: looking for hw decoder module matching "any": 3 candidates
main debug: using hw decoder module "vaapi"
main debug: Received first picture
main debug: Decoder wait done in 296 ms
main debug: creating demux: access='' demux='mp4' location='' file='(null)'
main debug: looking for demux module matching "mp4": 56 candidates
adaptive debug: Retrieving http://10.75.28.48:80/Dash_Disp1-Zone1/v2_2_gpac.m4s @0
mp4 debug: dumping root Box "root"
mp4 debug: | + ftyp size 24 offset 0
mp4 debug: | + free size 66 offset 24
mp4 debug: | + moov size 677 offset 90
mp4 debug: | | + mvhd size 108 offset 98
mp4 debug: | | + mvex size 56 offset 206
mp4 debug: | | | + mehd size 16 offset 214
mp4 debug: | | | + trex size 32 offset 230
mp4 debug: | | + trak size 505 offset 262
mp4 debug: | | | + tkhd size 92 offset 270
mp4 debug: | | | + mdia size 405 offset 362
mp4 debug: | | | | + mdhd size 32 offset 370
mp4 debug: | | | | + hdlr size 55 offset 402
mp4 debug: | | | | + minf size 310 offset 457
mp4 debug: | | | | | + vmhd size 20 offset 465
mp4 debug: | | | | | + dinf size 36 offset 485
mp4 debug: | | | | | | + dref size 28 offset 493
mp4 debug: | | | | | | | + url size 12 offset 509
mp4 debug: | | | | | + stbl size 246 offset 521
mp4 debug: | | | | | | + stsd size 154 offset 529
mp4 debug: | | | | | | | + avc1 size 138 offset 545
mp4 debug: | | | | | | | | + avcC size 52 offset 631
mp4 debug: | | | | | | + stts size 16 offset 683
mp4 debug: | | | | | | + stss size 16 offset 699
mp4 debug: | | | | | | + stsc size 16 offset 715
mp4 debug: | | | | | | + stsz size 20 offset 731
mp4 debug: | | | | | | + stco size 16 offset 751
mp4 debug: | + styp size 28 offset 767
我们非常感谢您的帮助。