Resampling audio for PAL Telecine

[ar]

Task.
I got some FILM material (23.976 fps): hd-video with audio. I want to make DVD from this. I decided to use PAL, so i need to make telecine conversation.

Details.
For video it is no big deal: just to assume new frame rate. But for audio this task should be a bit complicated, because i need to convert sample rate or use some TimeStretch-filter.
To keep it simple i decided to use sample rate conversion wich lead to little speed-up and corresponding pitch-effect. Input have 48kHz audio and 24000/1001 fps video, output audio should be 48kHz to, but output video should be 25 fps. So the sample rate conversation scheme should be:

Assume new sr for input audio samples 48000/(24000/1001)*25=50050 (Hz);
Convert sample rate back to 48kHz.


I've done this with commands:
ffmpeg -i ed-cm-st-16bit.wav\
-acodec pcm_f32le -ac 2 -f f32le pipe:1 |\
ffmpeg -ar 50050 -ac 2 -acodec pcm_f32le -f f32le -i pipe:0\
-acodec pcm_f32le -ac 2 -f wav f32le_st.wav &&\
fsrctool -q push -i f32le_st.wav -o outst.wav -r 48000

Question.
I've used FSRC-filter (libfsrc) due to it's outstanding quality. Is there someone who know wich SRC-filter ffmpeg utilises? The manual says, it's «high quality polyphase filter». Is this filter homegrown or it is from libsrc (secret-rabbit-code)? Also, originaly i used to use SSRC-filter from Naoki Shibata.

PS:
Comparison of SRC-filters at http://src.infinitewave.ca/

[pandy]

don't forget about http://sox.sourceforge.net/

[smok3]

how do you assume another framerate with ffmpeg? (the equivalent of assumefps(25))

(I need something general for going from 23.xx or 24 fps to 25 fps)

[Ghitulescu]

I used sox once to convert a movie audio track to a CD, the result was extremely good. I understand that many audiophiles protest against sampling conversion, but for simple voice and movie sounds I don't think you'll have quality issues.