"There is no bookmark"

[DoctorDinosaur]

Description of bug / unexpected behavior

I keep getting Exception: There is no <bookmark mark='BookmarkName' /> with no obvious connection between when it happens.

Expected behavior

Bookmarks are properly picked up

How to reproduce the issue

I don't know why it happens sometimes but not other times.

Code for reproducing the problem

self.set_speech_service(GTTSService(lang="en", tld="com", transcription_model='base', global_speed=1.2))
with self.voiceover(text="""With <bookmark mark='A'/>this result, 
                                    we can now go <bookmark mark='B'/>back and derive our formula for updating the kernel weights.""") as tracker:
            self.wait_until_bookmark("A")
            self.play(Indicate(s1_text), Unwrite(s2_text), Unwrite(s3_text), Unwrite(s4_text))
            self.wait_until_bookmark("B")
            self.play(Write(new_weights), s1_text.animate.to_edge(UP).to_edge(RIGHT)), s1_text.animate.scale(0.5)
            self.wait_for_voiceover()

doesn't work but

self.set_speech_service(GTTSService(lang="en", tld="com", transcription_model='base', global_speed=1.2))
with self.voiceover(text="""The kernel weights are updated, or trained, using the following formula<bookmark mark='A'/>, 
                                    where <bookmark mark='B' />alpha is the learning rate hyperparameter 
                                    and <bookmark mark='C'/>W is the kernel weight matrix.""") as tracker:
            self.play(Write(new_weights), run_time=tracker.time_until_bookmark("A"))
            self.wait_until_bookmark("B")
            self.play(Indicate(new_weights[0][7]))
            self.wait_until_bookmark("C")
            self.play(Indicate(new_weights[0][0:3]), Indicate(new_weights[0][4:6]))

Does

Logs

Terminal output

Nothing useful/relevant in the debug log.

Here's the error traceback: https://pastebin.com/pUGT9LF2

System specifications

System Details

• OS (with version, e.g., Windows 10 v2004 or macOS 10.15 (Catalina)): Windows 10
• RAM: 16GB
• Python version (python/py/python3 --version): 3.10.12
• Installed modules (provide output from pip list): https://pastebin.com/0YZ0fC7m

LaTeX details

• LaTeX distribution (e.g. TeX Live 2020): MikTex
• Installed LaTeX packages: (A lot, don't wanna take hundreds of screenshots)

FFMPEG

Output of ffmpeg -version:

ffmpeg version 4.2.3 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 9.3.1 (GCC) 20200523
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
libavutil      56. 31.100 / 56. 31.100
libavcodec     58. 54.100 / 58. 54.100
libavformat    58. 29.100 / 58. 29.100
libavdevice    58.  8.100 / 58.  8.100
libavfilter     7. 57.100 /  7. 57.100
libswscale      5.  5.100 /  5.  5.100
libswresample   3.  5.100 /  3.  5.100
libpostproc    55.  5.100 / 55.  5.100

Additional comments

[DoctorDinosaur]

Deleting the media folder fixed it this time, but I shouldn't really have to do that, no?

[DoctorDinosaur]

I think the issue boils down to it not updating if you add a bookmark, only if you change the spoken text?

[PhilippImhof]

I can confirm this issue and your analysis. If the text to be spoken is modified, the error does not occur. For me, it works, if I remove media/voiceovers/cache.json, no need to remove everything from the media directory.