MP4到DASH(bash脚本) [英] MP4 to DASH (bash script)

查看：171 发布时间：2020/5/12 19:42:03 bash ffmpeg video-streaming mp4 mpeg-dash

本文介绍了MP4到DASH(bash脚本)的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有一个网站，用户可以在其中上传视频文件.我想使用DASH来流式传输所有视频，以获得自适应比特率流式传输.因此，我写了一个bash脚本(由cron运行)，将所有mp4文件转换为DASH，但无法正常工作:什么地方出了错?

I have a web site in which users can upload video files. I want to stream all of them using DASH to obtain an adaptive bitrate streaming. So I wrote a bash script (to run by cron) that converts all mp4 files to DASH, but it doesn't work properly: what is wrong?

例如，使用以下脚本，我获得了: https://www.informatica-libera.net/dash_faq/stream.mpd

For example, using the following script, I obtained: https://www.informatica-libera.net/dash_faq/stream.mpd

它可以验证，但不能播放.我对它进行了测试: http://dash-mse-test.appspot.com/dash-player.html?url=https%3A%2F%2Fwww.informatica-libera.net ％2Fdash_faq％2Fstream.mpd& autoplay = on& adapt = auto& flavor =

It validates, but it doesn't play. I tested it on: http://dash-mse-test.appspot.com/dash-player.html?url=https%3A%2F%2Fwww.informatica-libera.net%2Fdash_faq%2Fstream.mpd&autoplay=on&adapt=auto&flavor=

感谢您的帮助. 代码:

Thank you for any help. The code:

#!/bin/bash

# THIS SCRIPT CONVERTS EVERY MP4 (IN THE CURRENT FOLDER AND SUBFOLDER)
# TO A MULTI-BITRATE VIDEO IN MP4-DASH
# For each file "videoname.mp4" it creates a folder "dash_videoname" 
# containing a dash manifest file "stream.mpd" and subfolders containing 
# video segments.

# mp4dash documentation and download: https://www.bento4.com/developers/dash/

MYDIR=$(dirname $(readlink -f ${BASH_SOURCE[0]}))
SAVEDIR=$(pwd)

# Check programs
if [ -z "$(which ffmpeg)" ]; then
    echo "Error: ffmpeg is not installed"
    exit 1
fi

if [ -z "$(which mp4dash)" ]; then
    echo "Error: mp4dash is not installed"
    exit 1
fi

cd "$MYDIR"

TARGET_FILES=$(find ./ -type f -name "*.mp4")
for f in $TARGET_FILES
do
  f=$(basename "$f") # fullname of the file
  f="${f%.*}" # name without extension

  if [ ! -d "dash_${f}" ]; then
    echo "Converting \"$f\" to multi-bitrate video in MPEG-DASH"

    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 1500k -vf "scale=-2:720" -f mp4 -pass 1 -y /dev/null
    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 1500k -vf "scale=-2:720" -f mp4 -pass 2 "${f}_1500.mp4"

    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 800k -vf "scale=-2:540" -f mp4 -pass 1 -y /dev/null
    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 800k -vf "scale=-2:540" -f mp4 -pass 2 "${f}_800.mp4"

    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 400k -vf "scale=-2:360" -f mp4 -pass 1 -y /dev/null
    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 400k -vf "scale=-2:360" -f mp4 -pass 2 "${f}_400.mp4"

    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 200k -vf "scale=-2:180" -f mp4 -pass 1 -y /dev/null
    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 200k -vf "scale=-2:180" -f mp4 -pass 2 "${f}_200.mp4"

    rm -f ffmpeg*log*

    mp4fragment "${f}_1500.mp4" "${f}_1500_fragmented.mp4"
    mp4fragment "${f}_800.mp4" "${f}_800_fragmented.mp4"
    mp4fragment "${f}_400.mp4" "${f}_400_fragmented.mp4"
    mp4fragment "${f}_200.mp4" "${f}_200_fragmented.mp4"

    rm -f "${f}_1500.mp4" "${f}_800.mp4" "${f}_400.mp4" "${f}_200.mp4"

    mp4dash -v -o "dash_${f}" "${f}_1500_fragmented.mp4" "${f}_800_fragmented.mp4" "${f}_400_fragmented.mp4" "${f}_200_fragmented.mp4"

    rm -f "${f}_1500_fragmented.mp4" "${f}_800_fragmented.mp4" "${f}_400_fragmented.mp4" "${f}_200_fragmented.mp4"

    fi

done

cd "$SAVEDIR"

推荐答案

我解决了这一问题(但是，它与每个现代浏览器都不完全兼容，例如在我的Linux版本的Firefox上，音频无法播放):

I solved so (however it's not fully compatible with every modern browser, for example on my Linux version of Firefox the audio doesn't play):

#!/bin/bash

# THIS SCRIPT CONVERTS EVERY MP4 (IN THE CURRENT FOLDER AND SUBFOLDER) TO A MULTI-BITRATE VIDEO IN MP4-DASH
# For each file "videoname.mp4" it creates a folder "dash_videoname" containing a dash manifest file "stream.mpd" and subfolders containing video segments.

# Validation tool:
# http://dashif.org/conformance.html

# Documentation:
# https://tdngan.wordpress.com/2016/11/17/how-to-encode-multi-bitrate-videos-in-mpeg-dash-for-mse-based-media-players/

# Remember to add the following mime-types (uncommented) to .htaccess:
# AddType video/mp4 m4s
# AddType application/dash+xml mpd

# DASH-264 JavaScript Reference Client
# https://github.com/Dash-Industry-Forum/dash.js
# https://github.com/Dash-Industry-Forum/dash.js/wiki

MYDIR=$(dirname $(readlink -f ${BASH_SOURCE[0]}))
SAVEDIR=$(pwd)

# Check programs
if [ -z "$(which ffmpeg)" ]; then
    echo "Error: ffmpeg is not installed"
    exit 1
fi

if [ -z "$(which MP4Box)" ]; then
    echo "Error: MP4Box is not installed"
    exit 1
fi

cd "$MYDIR"

TARGET_FILES=$(find ./ -type f -name "*.mp4")
for f in $TARGET_FILES
do
  f=$(basename "$f") # fullname of the file
  f="${f%.*}" # name without extension

  if [ ! -d "dash_${f}" ]; then
    echo "Converting \"$f\" to multi-bitrate video in MPEG-DASH"

    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -vn "${f}_audio.m4a"

    ffmpeg -y -i "${f}.mp4" -an -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 1500k -vf "scale=-2:720" -f mp4 -pass 1 -y /dev/null
    ffmpeg -y -i "${f}.mp4" -an -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 1500k -vf "scale=-2:720" -f mp4 -pass 2 "${f}_1500.mp4"

    ffmpeg -y -i "${f}.mp4" -an -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 800k -vf "scale=-2:540" -f mp4 -pass 1 -y /dev/null
    ffmpeg -y -i "${f}.mp4" -an -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 800k -vf "scale=-2:540" -f mp4 -pass 2 "${f}_800.mp4"

    ffmpeg -y -i "${f}.mp4" -an -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 400k -vf "scale=-2:360" -f mp4 -pass 1 -y /dev/null
    ffmpeg -y -i "${f}.mp4" -an -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 400k -vf "scale=-2:360" -f mp4 -pass 2 "${f}_400.mp4"

    ffmpeg -y -i "${f}.mp4" -an -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 200k -vf "scale=-2:180" -f mp4 -pass 1 -y /dev/null
    ffmpeg -y -i "${f}.mp4" -an -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 200k -vf "scale=-2:180" -f mp4 -pass 2 "${f}_200.mp4"

    rm -f ffmpeg*log*

    MP4Box -dash 2000 -rap -frag-rap -profile onDemand "${f}_1500.mp4" "${f}_800.mp4" "${f}_400.mp4" "${f}_200.mp4" "${f}_audio.m4a" -out "${f}_MP4.mpd"


    rm  "${f}_1500.mp4" "${f}_800.mp4" "${f}_400.mp4" "${f}_200.mp4" "${f}_audio.m4a"

    fi

done

cd "$SAVEDIR"

我也尝试了VP9而不是h.264，但是在这种情况下，它也不兼容所有浏览器(在我的Linux发行版中，它只能在Firefox上正常播放，而在Chrome上却无法播放) :

I also tried VP9 instead of h.264, but also in this case there isn't compatibility with all browser (in my Linux distro, it plays correctly only on Firefox, while it doesn't play at all on Chrome):

#!/bin/bash
MYDIR=$(dirname $(readlink -f ${BASH_SOURCE[0]}))
SAVEDIR=$(pwd)

# Controlla che i programmi richiesti siano installati
if [ -z "$(which ffmpeg)" ]; then
    echo "Errore: ffmpeg non e' installato"
    exit 1
fi

cd "$MYDIR"

TARGET_FILES=$(find ./ -type f -name "*.mp4")
for f in $TARGET_FILES
do
  f=$(basename "$f") # memorizza il nome completo del file
  f="${f%.*}" # toglie l'estensione
  if [ ! -f "${f}.mpd" ]; then
    echo "Converto il file \"$f\" in Adaptive WebM using DASH"
    echo "Riferimenti: http://wiki.webmproject.org/adaptive-streaming/instructions-to-playback-adaptive-webm-using-dash"

    # http://wiki.webmproject.org/adaptive-streaming/instructions-to-playback-adaptive-webm-using-dash

    VP9_DASH_PARAMS="-tile-columns 4 -frame-parallel 1"

    ffmpeg -i "${f}.mp4" -c:v libvpx-vp9 -vf scale=-1:90 -b:v 250k -keyint_min 150 -g 150 ${VP9_DASH_PARAMS} -an -f webm -dash 1 -pass 1 -y /dev/null
    ffmpeg -i "${f}.mp4" -c:v libvpx-vp9 -vf scale=-1:90 -b:v 250k -keyint_min 150 -g 150 ${VP9_DASH_PARAMS} -an -f webm -dash 1 -pass 2 "${f}_160px_250k.webm"

    ffmpeg -i "${f}.mp4" -c:v libvpx-vp9 -vf scale=-1:180 -b:v 500k -keyint_min 150 -g 150 ${VP9_DASH_PARAMS} -an -f webm -dash 1 -pass 1 -y /dev/null
    ffmpeg -i "${f}.mp4" -c:v libvpx-vp9 -vf scale=-1:180 -b:v 500k -keyint_min 150 -g 150 ${VP9_DASH_PARAMS} -an -f webm -dash 1 -pass 2 "${f}_320px_500k.webm"

    ffmpeg -i "${f}.mp4" -c:v libvpx-vp9 -vf scale=-1:360 -b:v 750k -keyint_min 150 -g 150 ${VP9_DASH_PARAMS} -an -f webm -dash 1 -pass 1 -y /dev/null
    ffmpeg -i "${f}.mp4" -c:v libvpx-vp9 -vf scale=-1:360 -b:v 750k -keyint_min 150 -g 150 ${VP9_DASH_PARAMS} -an -f webm -dash 1 -pass 2 "${f}_640px_750k.webm"

    ffmpeg -i "${f}.mp4" -c:v libvpx-vp9 -vf scale=-1:360 -b:v 1000k -keyint_min 150 -g 150 ${VP9_DASH_PARAMS} -an -f webm -dash 1 -pass 1 -y /dev/null
    ffmpeg -i "${f}.mp4" -c:v libvpx-vp9 -vf scale=-1:360 -b:v 1000k -keyint_min 150 -g 150 ${VP9_DASH_PARAMS} -an -f webm -dash 1 -pass 2 "${f}_640px_1000k.webm"

    ffmpeg -i "${f}.mp4" -c:v libvpx-vp9 -vf scale=-1:720 -b:v 1500k -keyint_min 150 -g 150 ${VP9_DASH_PARAMS} -an -f webm -dash 1 -pass 1 -y /dev/null
    ffmpeg -i "${f}.mp4" -c:v libvpx-vp9 -vf scale=-1:720 -b:v 1500k -keyint_min 150 -g 150 ${VP9_DASH_PARAMS} -an -f webm -dash 1 -pass 2 "${f}_1280px_1500k.webm"

    ffmpeg -i "${f}.mp4" -c:a libvorbis -b:a 128k -vn -f webm -dash 1 "${f}_audio_128k.webm"


    rm -f ffmpeg*.log

    ffmpeg \
    -f webm_dash_manifest -i "${f}_160px_250k.webm" \
    -f webm_dash_manifest -i "${f}_320px_500k.webm" \
    -f webm_dash_manifest -i "${f}_640px_750k.webm" \
    -f webm_dash_manifest -i "${f}_640px_1000k.webm" \
    -f webm_dash_manifest -i "${f}_1280px_1500k.webm" \
    -f webm_dash_manifest -i "${f}_audio_128k.webm" \
    -c copy -map 0 -map 1 -map 2 -map 3 -map 4 -map 5 \
    -f webm_dash_manifest \
    -adaptation_sets "id=0,streams=0,1,2,3,4 id=1,streams=5" \
    "${f}.mpd"

    fi

done

cd "$SAVEDIR"

我没有找到向所有浏览器提供音频/视频内容的方法.我已经完成了测试，所以:

I didn't find a way to serve audio/video content to all browsers. I've done my tests so:

<!DOCTYPE html>
<html>
<head>
<script src="http://cdn.dashjs.org/latest/dash.all.min.js"></script>
<style>
    video {
       width: 640px;
       height: 360px;
    }
</style>
</head>
<body>
<div>
       <video data-dashjs-player autoplay src="test.mpd" controls></video>
   </div>
</body>
</html>

这篇关于MP4到DASH(bash脚本)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

查看全文

MP4到DASH(bash脚本) [英] MP4 to DASH (bash script)

问题描述

推荐答案

相关文章

其他开发最新文章

热门教程

热门工具

登录关闭

MP4到DASH(bash脚本) [英] MP4 to DASH (bash script)

问题描述

推荐答案

相关文章

其他开发最新文章

热门教程

热门工具

登录 关闭

登录关闭