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• FFPlay : How to manually select video quality during playing the mpd stream ?

  19 août 2023, par Brian_wu

  I used ffplay to play mpd stream and successed,

  


  Here the MPD file :

  


  &lt;?xml version="1.0" encoding="utf-8"?>&#xA;<mpd xmlns="urn:mpeg:dash:schema:mpd:2011" profiles="urn:mpeg:dash:profile:isoff-live:2011" type="static" mediapresentationduration="PT1M8.7S" maxsegmentduration="PT5.0S" minbuffertime="PT12.5S">&#xA;    <programinformation>&#xA;    </programinformation>&#xA;    <servicedescription>&#xA;    </servicedescription>&#xA;    <period start="PT0.0S">&#xA;        <adaptationset contenttype="video" startwithsap="1" segmentalignment="true" bitstreamswitching="true" framerate="24000/1001" maxwidth="1280" maxheight="720" par="16:9">&#xA;        <representation mimetype="video/mp4" codecs="avc1.4d401f" bandwidth="10237" width="480" height="270" sar="1:1">&#xA;            <segmenttemplate timescale="24000" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="1">&#xA;                <segmenttimeline>&#xA;                    <s t="0" d="150150" r="9"></s>&#xA;                    <s d="149149"></s>&#xA;                </segmenttimeline>&#xA;            </segmenttemplate>&#xA;        </representation>&#xA;        <representation mimetype="video/mp4" codecs="avc1.4d401f" bandwidth="60882" width="1280" height="720" sar="1:1">&#xA;            <segmenttemplate timescale="24000" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="1">&#xA;                <segmenttimeline>&#xA;                    <s t="0" d="150150" r="9"></s>&#xA;                    <s d="149149"></s>&#xA;                </segmenttimeline>&#xA;            </segmenttemplate>&#xA;        </representation>&#xA;    </adaptationset>&#xA;    <adaptationset contenttype="audio" startwithsap="1" segmentalignment="true" bitstreamswitching="true" lang="und">&#xA;        <representation mimetype="audio/mp4" codecs="mp4a.40.2" bandwidth="128000" audiosamplingrate="32000">&#xA;            <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"></audiochannelconfiguration>&#xA;            <segmenttemplate timescale="32000" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="1">&#xA;                <segmenttimeline>&#xA;                    <s t="0" d="159744"></s>&#xA;                    <s d="160768" r="11"></s>&#xA;                    <s d="111915"></s>&#xA;                </segmenttimeline>&#xA;            </segmenttemplate>&#xA;        </representation>&#xA;        <representation mimetype="audio/mp4" codecs="mp4a.40.2" bandwidth="128000" audiosamplingrate="44100">&#xA;            <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"></audiochannelconfiguration>&#xA;            <segmenttemplate timescale="44100" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="1">&#xA;                <segmenttimeline>&#xA;                    <s t="0" d="220160"></s>&#xA;                    <s d="221184" r="11"></s>&#xA;                    <s d="158713"></s>&#xA;                </segmenttimeline>&#xA;            </segmenttemplate>&#xA;        </representation>&#xA;    </adaptationset>&#xA;</period>&#xA;</mpd>

  



  this dash stream contains 2 vindeos(480P and 720P), and 2 audios.The videos always starts low quality(480P), I want to change the video resolution to the high quality(720P) during playing process, what should i do ?

  


• Bash : Create copy of music files in different format and folder

  13 mai 2021, par Brett Sjoholm

  I'm trying to create a bash scipt to simply automate finding my flac files and creating an alac copy of them in a separate folder. Just so I have my little itunes folder. Want to automate because so many.

  


  So I find my flac folders within my Eminem folder....

  


  :~$ find /mnt/music/Eminem -type d -name *FLAC
    /mnt/music/Eminem/2009 Relapse FLAC
    /mnt/music/Eminem/1996 Infinite FLAC
    /mnt/music/Eminem/1999 The Slim Shady LP FLAC
    /mnt/music/Eminem/2000 Marshall Mathers LP FLAC


  


  Now instead of going into each folder and converting manually using something like

  


      ffmpeg -i track.flac -acodec alac track.m4a...


  


  How do I, within a bash script, take these multiple folders. Create an ALAC copy of the contents in /mnt/music/iTunes using FFMpeg ?

  


  New folder will be...

  


  /mnt/music/iTunes/Eminem/2009 Relapse ALAC/track.m4a


  


  All flac folders have FLAC at the end in the same folder structure.

  


  /mnt/music/Artist/Year Album FLAC


  


  I understand most of the locating, copying, converting, manually terminal command stuff but when it comes to putting it into a bash script. I don't understand how I take the output of each command and use it for another. The list of folder for example. Don't know how to automate doing all the steps for each.

  


  Kind of long winded but any help will be much appreciated. Even some videos you recommend for learning.

  


• FFMPEG : Specifying Output Stream Type When Combing Multiple Filters

  7 mai 2021, par Leonard Bedner

  I currently have 3 separate ffmpeg commands that do the following :

  


  

  1. Overlay a watermark on a video : ffmpeg -i samplegreen.webm -i foregrounds/myimage.png -r 30 -filter_complex "overlay=(W-w)/2:H-h" -af "adelay=700" output.mp4

  


  2. Overlay the results of 1) onto a beach video : ffmpeg -i backgrounds/beachsunsetmp4.mp4 -i output.mp4 -filter_complex "[1:v]chromakey=0x005d0b:0.1485:0.03[ckout];[0:v][ckout]overlay[o]" -map [o] -map 1:a -shortest somefolder/sample_video.mp4

  


  3. Merge the audio of the results of 2) with another audio file : ffmpeg -i somefolder/sample_video.mp4 -i backgrounds/beachsunsetmp4.mp3 -filter_complex '[0:a][1:a]amerge=inputs=2[a]' -map 0:v -map '[a]' -c:v copy -ac 2 -shortest anotherfolder/sample_video.mp4

  


  


  Now, this all works as intended, however, I was looking into attempting to combine them all into a single command, combining all the filters, like so :

  


  ffmpeg -i samplegreen.webm -i foregrounds/myimage.png -r 30 -i backgrounds/beachsunsetmp4.mp4 -i backgrounds/beachsunsetmp4.mp3 -filter_complex \
    "[0]overlay=(W-w)/2:H-h[output_1]; \
     [output_1]chromakey=0x005d0b:0.1485:0.03[ckout]; \
     [2:v][ckout]overlay[output_2]; \
     [output_2][3:a] amerge=inputs=2 [output_3]" \
    -af "adelay=700" -map [output_3] shortest final.mp4


  


  It fails with the following error (Media type mismatch between the 'Parsed_overlay_2' filter output pad 0 (video) and the 'Parsed_amerge_3' filter input pad 0 (audio)) :

  


  ffmpeg version 4.3.2 Copyright (c) 2000-2021 the FFmpeg developers
  built with Apple clang version 11.0.0 (clang-1100.0.33.17)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.2_1 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, matroska,webm, from 'samplegreen.webm':
  Metadata:
    encoder         : Chrome
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0(eng): Video: vp8, yuv420p(progressive), 1280x720, SAR 1:1 DAR 16:9, 1k tbr, 1k tbn, 1k tbc (default)
    Metadata:
      alpha_mode      : 1
    Stream #0:1(eng): Audio: opus, 48000 Hz, mono, fltp (default)
Input #1, png_pipe, from 'foregrounds/myimage.png':
  Duration: N/A, bitrate: N/A
    Stream #1:0: Video: png, rgba(pc), 350x86, 25 tbr, 25 tbn, 25 tbc
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'backgrounds/beachsunsetmp4.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    creation_time   : 2021-02-16T18:24:40.000000Z
  Duration: 00:00:32.53, start: 0.000000, bitrate: 3032 kb/s
    Stream #2:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720, 3027 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    Metadata:
      creation_time   : 2021-02-16T18:24:40.000000Z
      handler_name    : ?Mainconcept Video Media Handler
      encoder         : AVC Coding
[mp3 @ 0x7f86cf809000] Estimating duration from bitrate, this may be inaccurate
Input #3, mp3, from 'backgrounds/beachsunsetmp4.mp3':
  Metadata:
    date            : 2021-02-18 06:49
    id3v2_priv.XMP  : <?xpacket begin="\xef\xbb\xbf" id="W5M0MpCehiHzreSzNTczkc9d"?>\x0a\x0a \x0a  s
    Stream #3:0: Audio: mp3, 48000 Hz, stereo, fltp, 128 kb/s
[Parsed_overlay_2 @ 0x7f86cd4039c0] Media type mismatch between the 'Parsed_overlay_2' filter output pad 0 (video) and the 'Parsed_amerge_3' filter input pad 0 (audio)
[AVFilterGraph @ 0x7f86cd402a40] Cannot create the link overlay:0 -> amerge:0
Error initializing complex filters.
Invalid argument


  


  As far as I can tell, the issue is that the filter, amerge, wants 2 audio streams. Normally, I could take the input stream argument (which is a video), and make it use the audio by doing something like [0:a][1:a]amerge=inputs=2[results]. However, since my input stream is the output of a preceding filter, that doesn't seem to work (i.e. [output_2:a]). It bombs out with :

  


  [matroska,webm @ 0x7fecca000000] Invalid stream specifier: output_2:a.
    Last message repeated 1 times
Stream specifier 'output_2:a' in filtergraph description [0]overlay=(W-w)/2:H-h[output_1];      [output_1]chromakey=0x005d0b:0.1485:0.03[ckout];      [2:v][ckout]overlay[output_2];      [output_2:a][3:a] amerge=inputs=2 [output_3] matches no streams.


  


  So all of that said... Is there a way to specify that I'd like to use the audio stream from the output of a preceding filter ? Or any other ways to combine all of these filters into a single command ?

  


  Thanks.

  


  Any help would be greatly appreciated !