A mageia's user report (https://bugs.mageia.org/show_bug.cgi?id=34703#c4) a fail with the 5.14.0 version

No more crash but downloads fail when merging either 
in Arte TV:

"0:17:00: INFO - core Choose: L'appât
10:17:01: INFO - core Choose: L'appât
10:17:02: INFO - artetv Load page: https://api.arte.tv/api/player/v2/config/fr/124743-000-A
10:17:02: INFO - artetv Get versions available
        url: https://manifest-arte.akamaized.net/api/manifest/v1/Generate/a9f52c2a-dce7-4e11-be2b-e35829496d0c/fr/XQ+KS+CHEV1/124743-000-A.m3u8
10:17:02: INFO - downloader Task added: 124743-000-A, tot: 1
10:17:03: INFO - downloader Get m3u8 file 0: 
   https://arte-cmafhls.akamaized.net/am/cmaf-extrait/124000/124700/124743-000-A_VF-STF/20250928218B4331954304AA83F8BE16AF450D0156/medias/124743-000-A_v720.m3u8
10:17:03: INFO - downloader Get m3u8 file 0: 
   https://arte-cmafhls.akamaized.net/am/cmaf-extrait/124000/124700/124743-000-A_VF-STF/20250928218B4331954304AA83F8BE16AF450D0156/medias/124743-000-A_aud_VF-FRA_3.m3u8
10:17:03: INFO - downloader initiate loader: https://arte-cmafhls.akamaized.net/am/cmaf-extrait/124000/124700/124743-000-A_VF-STF/20250928218B4331954304AA83F8BE16AF450D0156/medias/124743-000-A_v720.mp4
        /home/phil/.Qarte/temp/124743-000-Avideo.mp4
10:17:03: INFO - downloader Start download L'appât file size: 27143534
10:17:03: INFO - downloader URL: https://arte-cmafhls.akamaized.net/am/cmaf-extrait/124000/124700/124743-000-A_VF-STF/20250928218B4331954304AA83F8BE16AF450D0156/medias/124743-000-A_v720.mp4
10:17:03: INFO - downloader initiate loader: https://arte-cmafhls.akamaized.net/am/cmaf-extrait/124000/124700/124743-000-A_VF-STF/20250928218B4331954304AA83F8BE16AF450D0156/medias/124743-000-A_aud_VF-FRA_3.mp4
        /home/phil/.Qarte/temp/124743-000-Aaudio.mp4
10:17:03: INFO - downloader Start download audio file size: 1976048
10:17:04: INFO - artetv File /home/phil/.Qarte/temp/124743-000-Avideo.mp4 downloaded
10:17:04: INFO - downloader Merge 2 files
10:17:04: INFO - downloader Merging finished, file: /home/phil/.Qarte/temp/124743-000-Afinal.mp4
10:17:04: WARNING - downloader Merging failed ! file not present"

Or in Arte Concert:

"10:21:40: INFO - arteconcert Display info of Slowdive
10:21:42: INFO - arteconcert Append item 116751-000-A to download basket
10:21:43: INFO - arteconcert read: https://arte-cmafhls.akamaized.net/am/cmaf-concert/116000/116700/116751-000-A/2025051705FF5B557DB628E393BCC703A2777B6E2D/medias/116751-000-A_v720.m3u8
10:21:44: INFO - arteconcert read: https://arte-cmafhls.akamaized.net/am/cmaf-concert/116000/116700/116751-000-A/2025051705FF5B557DB628E393BCC703A2777B6E2D/medias/116751-000-A_aud_VO-ANG_1.m3u8
10:21:44: INFO - arteconcert Start download Slowdive file size: 967015564
10:21:44: INFO - arteconcert URL: https://arte-cmafhls.akamaized.net/am/cmaf-concert/116000/116700/116751-000-A/2025051705FF5B557DB628E393BCC703A2777B6E2D/medias/116751-000-A_v720.mp4
10:21:44: INFO - arteconcert Start download audio file size: 57954788
10:21:44: INFO - arteconcert Summary saved: /home/phil/Vidéos/Arte/index
10:22:22: INFO - arteconcert File /home/phil/.Qarte/temp/116751-000-Avideo.mp4 downloaded
10:22:22: INFO - arteconcert Merging finished, rename ..."
No file save in the final directory.

Do you want I open a new report here?