ZDF: audio is 1.8 sec ahead of video #3534

litist · 2021-02-03T12:26:44Z

Plugin Issue

This is a plugin issue and I have read the contribution guidelines.
I am using the latest development version from the master branch.

Description

When i save a ZDF stream to a file, it happens, that the audio is roughly 1.8sec ahead of the video. I would estimate that this happens in half of the cases, in the others audio is sync.
This also happens when i am using other stream quality options.

Reproduction steps / Explicit stream URLs to test

streamlink https://www.zdf.de/live-tv "720,best" -o zdf_day1_210202_1.mp4 -f --hls-duration 20 --loglevel debug

Log output

root@e55ff1a203c8:/streamlink# /root/.local/bin/streamlink https://www.zdf.de/live-tv "720,best" -o zdf_day1_210202_1.mp4 -f  --hls-duration 20 --loglevel debug
[cli][info] streamlink is running as root! Be careful!
[cli][debug] OS:         Linux-4.15.0-99-lowlatency-x86_64-with-glibc2.29
[cli][debug] Python:     3.8.5
[cli][debug] Streamlink: 2.0.0+34.g64365fa
[cli][debug] Requests(2.25.1), Socks(1.7.1), Websocket(0.57.0)
[cli][info] Found matching plugin zdf_mediathek for URL https://www.zdf.de/live-tv
[utils.l10n][debug] Language code: en_US
[stream.hls][debug] Using external audio tracks for stream 270p (language=deu, name=TV Ton)
[stream.hls][debug] Using external audio tracks for stream 270p_alt (language=deu, name=TV Ton)
[stream.hls][debug] Using external audio tracks for stream 360p (language=deu, name=TV Ton)
[stream.hls][debug] Using external audio tracks for stream 360p_alt (language=deu, name=TV Ton)
[stream.hls][debug] Using external audio tracks for stream 540p (language=deu, name=TV Ton)
[stream.hls][debug] Using external audio tracks for stream 540p_alt (language=deu, name=TV Ton)
[stream.hls][debug] Using external audio tracks for stream 720p (language=deu, name=TV Ton)
[stream.hls][debug] Using external audio tracks for stream 720p_alt (language=deu, name=TV Ton)
[utils.l10n][debug] Language code: en_US
[stream.hls][debug] Using external audio tracks for stream 720p (language=deu, name=TV Ton)
[stream.hls][debug] Using external audio tracks for stream 720p_alt (language=deu, name=TV Ton)
[utils.l10n][debug] Language code: en_US
[stream.hls][debug] Using external audio tracks for stream 270p (language=deu, name=TV Ton)
[stream.hls][debug] Using external audio tracks for stream 270p_alt (language=deu, name=TV Ton)
[stream.hls][debug] Using external audio tracks for stream 360p (language=deu, name=TV Ton)
[stream.hls][debug] Using external audio tracks for stream 360p_alt (language=deu, name=TV Ton)
[stream.hls][debug] Using external audio tracks for stream 540p (language=deu, name=TV Ton)
[stream.hls][debug] Using external audio tracks for stream 540p_alt (language=deu, name=TV Ton)
[utils.l10n][debug] Language code: en_US
[stream.hls][debug] Using external audio tracks for stream 270p (language=deu, name=TV Ton)
[stream.hls][debug] Using external audio tracks for stream 270p_alt (language=deu, name=TV Ton)
[stream.hls][debug] Using external audio tracks for stream 360p (language=deu, name=TV Ton)
[stream.hls][debug] Using external audio tracks for stream 360p_alt (language=deu, name=TV Ton)
[cli][info] Available streams: 270p_alt (worst), 270p, 360p_alt, 360p, 540p_alt, 540p, 720p_alt, 720p (best)
[cli][info] Opening stream: 720p (hls-multi)
[stream.ffmpegmux][debug] Opening hls substream
[stream.hls][debug] Reloading playlist
[stream.hls][debug] First Sequence: 2086956; Last Sequence: 2087840
[stream.hls][debug] Start offset: 0; Duration: 20; Start Sequence: 2087838; End Sequence: None
[stream.hls][debug] Adding segment 2087838 to queue
[stream.ffmpegmux][debug] Opening hls substream
[stream.hls][debug] Reloading playlist
[stream.hls][debug] Adding segment 2087839 to queue
[stream.hls][debug] Adding segment 2087840 to queue
[stream.hls][debug] First Sequence: 2086957; Last Sequence: 2087841
[stream.hls][debug] Start offset: 0; Duration: 20; Start Sequence: 2087839; End Sequence: None
[stream.hls][debug] Adding segment 2087839 to queue
[stream.hls][debug] Adding segment 2087840 to queue
[stream.hls][debug] Adding segment 2087841 to queue
[stream.ffmpegmux][debug] ffmpeg command: ffmpeg -nostats -y -i /tmp/ffmpeg-5819-744 -i /tmp/ffmpeg-5819-93 -c:v copy -c:a copy -map 0:v? -map 0:a? -map 1:a -f mpegts pipe:1
[stream.ffmpegmux][debug] Starting copy to pipe: /tmp/ffmpeg-5819-744
[stream.ffmpegmux][debug] Starting copy to pipe: /tmp/ffmpeg-5819-93
[cli][debug] Pre-buffering 8192 bytes
[stream.hls][debug] Download of segment 2087839 complete
[stream.hls][debug] Download of segment 2087840 complete
[stream.hls][debug] Download of segment 2087841 complete
[stream.hls][debug] Download of segment 2087838 complete
[stream.hls][debug] Download of segment 2087839 complete
[stream.hls][debug] Download of segment 2087840 complete
[cli][debug] Checking file output
[cli][debug] Writing stream to output
[stream.hls][debug] Reloading playlist
[stream.hls][debug] Adding segment 2087841 to queue
[stream.hls][debug] Reloading playlist
[stream.hls][debug] Adding segment 2087842 to queue
[stream.hls][debug] Download of segment 2087841 complete
[download][zdf_day1_210202_1.mp4] Written 2.0 MB (1s @ 1.0 MB/s)                                                                                                                                                                                                                e
[stream.hls][debug] Reloading playlist
[stream.hls][debug] Adding segment 2087842 to queue
[stream.hls][debug] Adding segment 2087843 to queue
[stream.hls][debug] Reloading playlist
[stream.hls][debug] Adding segment 2087843 to queue
[stream.hls][debug] Download of segment 2087842 complete
[stream.hls][debug] Download of segment 2087843 complete
[download][zdf_day1_210202_1.mp4] Written 2.6 MB (4s @ 657.1 KB/s)                                                                                                                                                                                                              e
[stream.hls][debug] Reloading playlist
[stream.hls][debug] Adding segment 2087844 to queue
[stream.hls][debug] Reloading playlist
[stream.hls][debug] Adding segment 2087844 to queue
[stream.hls][debug] Download of segment 2087844 complete
[stream.hls][debug] Download of segment 2087844 complete
[download][zdf_day1_210202_1.mp4] Written 3.6 MB (6s @ 598.8 KB/s)                                                                                                                                                                                                              t
[stream.hls][debug] Adding segment 2087845 to queue
[stream.hls][debug] Reloading playlist
[stream.hls][debug] Adding segment 2087845 to queue
[stream.hls][debug] Download of segment 2087845 complete
[stream.hls][debug] Download of segment 2087845 complete
[download][zdf_day1_210202_1.mp4] Written 4.7 MB (8s @ 578.5 KB/s)                                                                                                                                                                                                              t
[stream.hls][debug] Adding segment 2087846 to queue
[stream.hls][debug] Reloading playlist
[stream.hls][debug] Adding segment 2087846 to queue
[stream.hls][debug] Download of segment 2087846 complete
[stream.hls][debug] Download of segment 2087846 complete
[download][zdf_day1_210202_1.mp4] Written 5.7 MB (10s @ 567.4 KB/s)                                           
[stream.hls][debug] Adding segment 2087847 to queue
[stream.hls][info] Stopping stream early after 20
[stream.segmented][debug] Closing worker thread
[stream.hls][debug] Reloading playlist
[stream.hls][debug] Download of segment 2087847 complete
[stream.segmented][debug] Closing writer thread
[stream.hls][debug] Adding segment 2087847 to queue
[stream.hls][debug] Download of segment 2087847 complete
[download][zdf_day1_210202_1.mp4] Written 6.8 MB (12s @ 469.2 KB/s)                                                                                                                                                                                                             t
[stream.hls][debug] Adding segment 2087848 to queue
[stream.hls][info] Stopping stream early after 20
[stream.segmented][debug] Closing worker thread
[stream.hls][debug] Download of segment 2087848 complete
[stream.segmented][debug] Closing writer thread
[stream.ffmpegmux][debug] Pipe copy complete: /tmp/ffmpeg-5819-93
[download][zdf_day1_210202_1.mp4] Written 7.6 MB (14s @ 493.3 KB/s)                                                                                                                                                                                                             4

[stream.ffmpegmux][debug] Closing ffmpeg thread
[stream.ffmpegmux][debug] Closed all the substreams
[cli][info] Stream ended
[cli][info] Closing currently open stream...

Additional comments, etc.

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The text was updated successfully, but these errors were encountered:

beardypig · 2021-02-03T15:40:57Z

Does it happen if you watch the stream live?

back-to · 2021-02-03T16:11:02Z

@beardypig

[stream.hls][debug] Start offset: 0; Duration: 20; Start Sequence: 2087838; End Sequence: None
...
[stream.hls][debug] Start offset: 0; Duration: 20; Start Sequence: 2087839; End Sequence: None

is is an Streamlink issue with all hls-multi streams, when a Stream start with one segment behind.

Ref #3438 (comment)

--ffmpeg-copyts doesn't work here though

litist · 2021-02-03T16:30:44Z

Does it happen if you watch the stream live?

Yes, this also happens if i run this:
streamlink https://www.zdf.de/live-tv "720p,best" --player-external-http --player-external-http-port 7001 -l debug

beardypig · 2021-02-03T16:46:24Z

@back-to is right, I noticed the same thing - but then I got distracted with something else :) They need to be synchronised some how.

Billy2011 · 2021-02-11T08:54:40Z

They need to be synchronised some how.

With the ffmpeg option -itsoffset (set the input time offset) it would theoretically be possible to synchronize the streams.

beardypig · 2021-02-11T09:45:13Z

Need to check the spec to see if the segment number always coincide or if there is some other mechanism that should be used.

Billy2011 · 2021-02-11T09:51:11Z

The #EXT-X-PROGRAM-DATE-TIME tag might be useful.

beardypig · 2021-02-12T12:37:12Z

The timestamp must be encoded in the aac file, it is required.

Each Packed Audio Segment MUST signal the timestamp of its first
sample with an ID3 Private frame (PRIV) tag [ID3] at the beginning of
the segment. The ID3 PRIV owner identifier MUST be
"com.apple.streaming.transportStreamTimestamp". The ID3 payload MUST
be a 33-bit MPEG-2 Program Elementary Stream timestamp expressed as a
big-endian eight-octet number, with the upper 31 bits set to zero.
Clients SHOULD NOT play Packed Audio Segments without this ID3 tag.

The question is how to get ffmpeg to use it :)

bastimeyer · 2022-08-10T08:35:23Z

Closing in favor of #4721

back-to added bug stream: HLS labels Feb 3, 2021

back-to mentioned this issue Feb 13, 2021

France TV (pluzz) plugin sometimes has desynchronization between image and sound #3438

Closed

2 tasks

back-to mentioned this issue Feb 27, 2021

plugins.pluzz: slow to (or never) start playing #3588

Closed

2 tasks

bastimeyer mentioned this issue Jul 30, 2022

plugins.ard_mediathek: No playable streams found on this URL #4687

Closed

4 tasks

bastimeyer mentioned this issue Aug 9, 2022

stream.hls: packed audio support #4721

Open

bastimeyer closed this as completed Aug 10, 2022

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ZDF: audio is 1.8 sec ahead of video #3534

ZDF: audio is 1.8 sec ahead of video #3534

litist commented Feb 3, 2021

beardypig commented Feb 3, 2021

back-to commented Feb 3, 2021

litist commented Feb 3, 2021

beardypig commented Feb 3, 2021

Billy2011 commented Feb 11, 2021

beardypig commented Feb 11, 2021

Billy2011 commented Feb 11, 2021

beardypig commented Feb 12, 2021

bastimeyer commented Aug 10, 2022

ZDF: audio is 1.8 sec ahead of video #3534

ZDF: audio is 1.8 sec ahead of video #3534

Comments

litist commented Feb 3, 2021

Plugin Issue

Description

Reproduction steps / Explicit stream URLs to test

Log output

Additional comments, etc.

beardypig commented Feb 3, 2021

back-to commented Feb 3, 2021

litist commented Feb 3, 2021

beardypig commented Feb 3, 2021

Billy2011 commented Feb 11, 2021

beardypig commented Feb 11, 2021

Billy2011 commented Feb 11, 2021

beardypig commented Feb 12, 2021

bastimeyer commented Aug 10, 2022