Adjust the h264 stream to be streamable:
Apparently the h264 codec has a special mode that is required for it to be efficiently streamable and you enable it with: -bsf:v h264_mp4toannexb
Script
The script I use to setup a H264+AAC matroska streaming pipe is this:
#!/bin/bash # ---------------------------------------------------------------------------- # This script is a helper to transcode a video to H264+AAC with subtitles to a # Matroska (.mkv) container that is suitable for live streaming to a mobile # device. It will transcode media that is not H264 or that has too high # resolution. It will not upsample content. # # Other suitable containers (and reasons for not using them) include: # * ASF (Microsoft, proprietary) # * MPEG2 Transport Stream (Standard, only supports bitmap subtitles) # * WebM (Has no support for metadata) # * DivX (Can't contain H264) # * FLV (Proprietary Bad support on target device) # * MP4 (Only bitmap subtitles, didn't work for streaming with FFMPEG) # * OGG (No support for H264) # ---------------------------------------------------------------------------- # ---------------------------------------------------------------------------- # Video options # ---------------------------------------------------------------------------- LINES=720 # One of: ultrafast,superfast, veryfast, faster, fast, medium, slow, slower, # veryslow or placebo PRESET=ultrafast # One of: baseline, main, high, high10, high422 or high444 PROFILE=high10 # One of: film animation grain stillimage psnr ssim fastdecode zerolatency TUNE=zerolatency # ---------------------------------------------------------------------------- # Audio options # ---------------------------------------------------------------------------- AUDIO="-c:a libfaac -b:a 128k -ar 48000 -ac 2 -async 1" SUBTITLES="-c:s copy" # ---------------------------------------------------------------------------- # Read input video parameters # ---------------------------------------------------------------------------- IN_RESOLUTION=`/usr/bin/ffmpeg -i "$" 2>&1 | grep Video | \ perl -lane 'print $1 if /(\d+x\d+)/'` IN_CODEC=`/usr/bin/ffmpeg -i "$" 2>&1 | grep Video | \ perl -lane 'print $1 if /Video: (\S+)/'` IN_DIMS=($) V_TRANSCODE="-c:v libx264 -bsf:v h264_mp4toannexb -preset $ \ tune $ -profile:v $" V_COPY="-c:v copy -bsf:v h264_mp4toannexb" if [ "$" > "$" ]; then SCALE="-filter:v scale=-1:$ $" else if ["$" != "h264" ]; then VIDEO=$OPT_TRANSCODE else VIDEO=$V_COPY fi fi exec /usr/bin/ffmpeg -threads `nproc` -i "$" $VIDEO $AUDIO $SUBTITLES \ -f matroska -y "$" &> /store/tmp/log TODO:
Make it read subtitles from external files if found and add them to the matroska stream. Make it not transcode the audio stream if it is already in a suitable format.