Python example for fixed bitrate ladder overwrites the video for each config generated

[bunrithlim]

File: python\src\fixed_bitrate_ladder.py

When calling _create_mp4_muxing(), the same file name is used for all video configs (video_configurations[]). For multiple video configs, only a single video file is left at the end as all files overwrite each other. The file remaining is "video.mp4".

This can be fixed by adding the height and bitrate to the file name of the video generated. Each video file created will have a different filename.

Suggested fix

file_name="video-{0}x{1}.mp4".format(video_configuration.height, video_configuration.bitrate)