How to start in 1280x720 resolution when playing a HLS stream

[eddsor]

I am using VLC 3.0.21 Vetinari from command line without X on a RPI3B+.

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cvlc https://nrk-od2.telenorcdn.net/open/ps/dnpr/dnpr63701115/d0bc193d-1.smil/index.m3u8

starts the video in low resolution. After a short time, the display goes black before the video continues in 1280x720 resolution.
The audio is correct from the beginning.

The content of the m3u8 file is:

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#EXTM3U #EXT-X-VERSION:4 #EXT-X-INDEPENDENT-SEGMENTS # AUDIO groups #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="aud1",LANGUAGE="un",NAME="Unknown",CHANNELS="2",AUTOSELECT=YES,DEFAULT=YES,URI="sc-gaFEAQ/a0_index.m3u8" # SUBTITLES groups #EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="sub1",LANGUAGE="no",NAME="Norsk",AUTOSELECT=YES,DEFAULT=YES,URI="sc-gaFEAQ/s0_index.m3u8" # Variants #EXT-X-STREAM-INF:BANDWIDTH=383136,AVERAGE-BANDWIDTH=272510,CODECS="avc1.42c00c,mp4a.40.2",RESOLUTION=320x180,FRAME-RATE=25.000,AUDIO="aud1",SUBTITLES="sub1" sc-gaFEAQ/v0_index.m3u8 #EXT-X-STREAM-INF:BANDWIDTH=689856,AVERAGE-BANDWIDTH=446361,CODECS="avc1.42c015,mp4a.40.2",RESOLUTION=480x270,FRAME-RATE=25.000,AUDIO="aud1",SUBTITLES="sub1" sc-gaFEAQ/v1_index.m3u8 #EXT-X-STREAM-INF:BANDWIDTH=1147520,AVERAGE-BANDWIDTH=689816,CODECS="avc1.4d401e,mp4a.40.2",RESOLUTION=640x360,FRAME-RATE=25.000,AUDIO="aud1",SUBTITLES="sub1" sc-gaFEAQ/v2_index.m3u8 #EXT-X-STREAM-INF:BANDWIDTH=2380368,AVERAGE-BANDWIDTH=1387251,CODECS="avc1.4d401f,mp4a.40.2",RESOLUTION=960x540,FRAME-RATE=25.000,AUDIO="aud1",SUBTITLES="sub1" sc-gaFEAQ/v3_index.m3u8 #EXT-X-STREAM-INF:BANDWIDTH=3912392,AVERAGE-BANDWIDTH=2362153,CODECS="avc1.64001f,mp4a.40.2",RESOLUTION=1280x720,FRAME-RATE=25.000,AUDIO="aud1",SUBTITLES="sub1" sc-gaFEAQ/v4_index.m3u8

However,

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cvlc https://nrk-od2.telenorcdn.net/open/ps/dnpr/dnpr63701115/d0bc193d-1.smil/sc-gaFEAQ/v4_index.m3u8

starts the video in 1280x720 resolution, but no audio.

This can partly be solved by starting two instances of VLC:

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cvlc https://nrk-od2.telenorcdn.net/open/ps/dnpr/dnpr63701115/d0bc193d-1.smil/sc-gaFEAQ/v4_index.m3u8 --control netsync --netsync-master & cvlc https://nrk-od2.telenorcdn.net/open/ps/dnpr/dnpr63701115/d0bc193d-1.smil/sc-gaFEAQ/a0_index.m3u8 --control netsync --netsync-master-ip 127.0.0.1

Jumping forward or backward in the video in this case gives an audio out of sync.

I hope anybody can tell me how to solve the problem by starting only one instance of VLC.

[eddsor]

Now I see that starting two instances of CVLC as shown above, is a good solution. There is usually no sync problems when jumping forward or backward in the video.