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stecman/ffmpeg_hls.md

Last active Dec 22, 2020
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ffmpeg streaming examples

FFmpeg streaming

These are some ffmpeg command lines used when developing VHS dubbing controller.

HLS Stream (on Linux)

#!/bin/bash

# Stream a PAL 50i capture, cropped and de-interlaced using ffmpeg
# Usage: ./stream.sh <input-video>

# Ensure there's a clean HLS directory
mkdir -p /dev/shm/hls;
rm /dev/shm/hls*

ffmpeg -re -i "$1" -vf "bwdif=mode=send_field:parity=tff,crop=692:554:14:8,format=yuv420p" \
    -loglevel repeat+info \
    -preset ultrafast -vcodec libx264 -tune zerolatency -flags +cgop -g 50 -b:v 5700k \
    -c:a aac -b:a 192k -ar 48000 -strict 2 \
    -movflags +faststart \
    -f hls \
    -hls_time 1\
    -hls_list_size 1 \
    -hls_wrap 20 \
    -hls_delete_threshold 1 \
    -hls_flags delete_segments \
    -hls_start_number_source datetime \
    -start_number 10 \
    /dev/shm/hls/stream.m3u8

UDP stream

# Re-stream a PAL 50i file to UDP
ffmpeg -re -i "$1" -vf "bwdif=mode=send_field:parity=tff,crop=692:554:14:8,format=yuv420p" \
    -preset ultrafast -vcodec libx264 -tune zerolatency -flags +cgop -g 50 -b:v 5700k \
    -c:a aac -b:a 192k -ar 48000 -strict 2 \
    -movflags +faststart \
    -f mpegts \
    'udp://127.0.0.1:5333/?pkt_size=1024&buffer_size=65535'
ffmpeg -re -i "$1" -c:v libx264 -preset ultrafast -crf 25 -flags +cgop -g 17 -c:a aac -b:a 192k -ar 48000 -strict 2 -f mpegts 'udp://127.0.0.1:5333'
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