I'm using a wetek play 2 with lastest ricardo's ATV rom and tvheadend to drive the integrated dvb-t tuner.
There is a very frequent high pitched audio glitch happening with french dvb-t channels using e-ac3 audio. This glitch is present in many apps like SPMC 16.7 and 17.x but also in kodi, in google live channels app, or also on PC when using ffdshow as audio decoder.
I have made researches to try to narrow down the source of this issue and it seems very likely to be libavcodec.
The described issue was reported some time ago in ffmpeg bugtracker and is now fixed:
I have done my own testing with the sample provided in the ffmpeg bug report (here is a mkv version to help testing small-audio_ac3_glitch.zip to verify libavcodec was the culprit and earlier versions fixed the issue:
The glitch occurs 2 times in this sample, at 00:20 and 00:41
On Win10 with potplayer:
built-in potplayer audio decoder -> no glitch
ffdshow tryout 4533 (old libavcodec) -> glitch
LAV decoder (0.70.2-88 lastest nightly) -> no glitch
On the wetek play 2:
SPMC 16.7.2 on ricardo ATV rom -> glitch
SPMC 17.6a2 on ricardo ATV rom -> glitch (not a high pitched sound but a sound cut/mute of the same duration and occuring as often as the high pitched glitch, so I suspect to be a failed attempt to fix the issue in libavcodec ? The same behaviour happens for google live channels app when not using ffmpeg decoder and I saw a user reporting the same for the official wetek app called WeTV)
google Live Channels (ffmpeg decoder enabled) on ricardo ATV rom -> glitch (high pitched sound)
Kodi 17.5 on ricardo ATV rom -> apparently no glitch
VLC and mxplayer on ricardo ATV rom -> no glitch
LibreELEC-WeTek_Play_2.aarch64-8.2.3 (official) -> no glitch
Do you think you could patch SPMC 16.7.2 to fix that issue ? (SPMC 16.7.2 was the only app with excellent video smoothness for dvb-t channels on the wetek play 2 with ricardo's ATV rom).
Hello Koying,
I'm using a wetek play 2 with lastest ricardo's ATV rom and tvheadend to drive the integrated dvb-t tuner.
There is a very frequent high pitched audio glitch happening with french dvb-t channels using e-ac3 audio. This glitch is present in many apps like SPMC 16.7 and 17.x but also in kodi, in google live channels app, or also on PC when using ffdshow as audio decoder.
I have made researches to try to narrow down the source of this issue and it seems very likely to be libavcodec.
The described issue was reported some time ago in ffmpeg bugtracker and is now fixed:
I have done my own testing with the sample provided in the ffmpeg bug report (here is a mkv version to help testing small-audio_ac3_glitch.zip to verify libavcodec was the culprit and earlier versions fixed the issue:
The glitch occurs 2 times in this sample, at 00:20 and 00:41
On Win10 with potplayer:
On the wetek play 2:
SPMC 16.7.2 on ricardo ATV rom -> glitch
SPMC 17.6a2 on ricardo ATV rom -> glitch (not a high pitched sound but a sound cut/mute of the same duration and occuring as often as the high pitched glitch, so I suspect to be a failed attempt to fix the issue in libavcodec ? The same behaviour happens for google live channels app when not using ffmpeg decoder and I saw a user reporting the same for the official wetek app called WeTV)
google Live Channels (ffmpeg decoder enabled) on ricardo ATV rom -> glitch (high pitched sound)
Kodi 17.5 on ricardo ATV rom -> apparently no glitch
VLC and mxplayer on ricardo ATV rom -> no glitch
LibreELEC-WeTek_Play_2.aarch64-8.2.3 (official) -> no glitch
Link to my extended reports for this E-AC3 issue in ricardo's ATV rom thread on the wetek forum, 1st post on January 25 (username: neel)
Do you think you could patch SPMC 16.7.2 to fix that issue ? (SPMC 16.7.2 was the only app with excellent video smoothness for dvb-t channels on the wetek play 2 with ricardo's ATV rom).
Thank you for all the work you are doing :)
Neel