Error when attempting to crossfade with duration longer than one of the files

[techlover10]

Steps to reproduce

Create an audio segment from a sound file. Attempt to append a second sound file, with a crossfade duration longer than the actual sound file.

Expected behavior

Either an error message that explains the issue, or a default to crossfading with the maximum length that would be possible.

Actual behavior

A TooManyMissingFrames exception is thrown from an unintuitive place.

Your System configuration

• Python version: 3.5.2
• Pydub version: 0.18.0
• ffmpeg or avlib?: ffmpeg
• ffmpeg/avlib version: 2.8.11-0ubuntu0.16.04.1

[jiaaro]

Minor update on this, that error happens when the crossfade is longer than original segment (not the one being appended).

…so in sound1.append(sound2, crossfade=1000), it happens when sound1 is shorter than 1000ms.

Rereading this now I understand but that wasn't what I expected :)