I added wav-type sources on top of the previous mp3-type sources to make the project a little bigger. Tests confirm that 'compression 5' is more efficient than 'compression 0'. I do not understand why. Phyllis' results seem more logical to me. I also add the results obtained using the flac preset of ffmpeg always at compression 0; 5 and 8. The fps are comparable but not the size (due to optimization patches?). Flac: ** rendered 26152 frames in 2.886 secs, 9061.677 fps, size 63.2 MiB ** rendered 26152 frames in 1.637 secs, 15975.565 fps, size 57.8 MiB ** rendered 26152 frames in 3.368 secs, 7764.846 fps, size 56.8 MiB ffmpeg flac: ** rendered 26152 frames in 3.102 secs, 8430.690 fps, size 138.4 MiB ** rendered 26152 frames in 1.649 secs, 15859.309 fps, size 127.8 MiB ** rendered 26152 frames in 2.937 secs, 8904.324 fps, size 126.4 MiB Flac 1.3 (appimage): ** rendered 26152 frames in 1.445 secs, 18098.270 fps, 63.4 MiB**