Implement -float-stream option for whisper-cli

[haraldrudell]

suggestion is to Implement -float-stream option for whisper-cli simplifying and enabling infinite streams

The simplest ingestion is by raw PCM samples read from standard input of a convention format

ffmpeg -hide_banner -i i.mp4 -ac 1 -ar 16k -f f32le - |
whisper-cli -float-stream --model ggml-large-v3-turbo.bin… | myTextConsumer

a raw PCM stream is easily produced by upstream software enabling mixing, file sequencing and infinite streams

• upstream effectively a media player
• avoids the wav 32-bit header issue that caps file length at about 30 hours
• eliminates sample-caching on local storage by ffmpeg and use of intermediate files

.

ffmpeg produces samples within 3 s for 5 h file which otherwise takes 10 minutes to create wav headers

.

whisper-cli ingestion reads 30 s of samples at a time until EOF

always 32-bit float little endian 16 kHz

• maximum simplicity of whisper-cli
• whisper-cli flips bytes on rare big endian hardware
• little endian is typical wav format
• option: multiple channels for diarize

.

ffmpeg is unavoidable to allow for any file format to be output in specific sample format