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• How do I get VLC to play back two separate input streams (Video and Audio) like MPV-Player with mpv —ytdl-format=FormatCode1+FormatCode2 URL

  29 avril 2021, par Gubbel

  so, I finally found out how to play a 1080p with 60fps smoothly on a Raspberry Py 4b or rather on a Raspberry Py 400.

  


  With the following OS installed :
Raspberry Pi OS with desktop and recommended software

  


  But I need to get from Youtube the avc1 (H.264) video stream and not the av01 (AV1) video stream.

  


  And sadly it only plays smooth, if I use the VLC-Media-Player to play back a completely downloaded file.

  


  The MPV alternative with e.g. :

  


  mpv --ytdl-format=299+140 https://www.youtube.com/watch?v=LXb3EKWsInQ


  


  lags sadly.

  


  So I thought of a method to use a similar option with VLC.

  


  My attempt :

  


  #!/bin/bash

echo 'Enter: videoFormatCode audioFormatCode URL'

read video audio link

videoLink=$(youtube-dl -g -f $video $link)

audioLink=$(youtube-dl -g -f $audio $link)




ffmpeg -i "$videoLink" -i "$audioLink" -f matroska - | vlc -


  


  So, first I will find out the format codes with :

  


  youtube-dl -F https://www.youtube.com/watch?v=LXb3EKWsInQ


  


  which gives me :

  


  format code  extension  resolution note
249          webm       audio only tiny   50k , webm_dash container, opus @ 50k (48000Hz), 1.88MiB
250          webm       audio only tiny   67k , webm_dash container, opus @ 67k (48000Hz), 2.51MiB
140          m4a        audio only tiny  129k , m4a_dash container, mp4a.40.2@129k (44100Hz), 4.84MiB
251          webm       audio only tiny  132k , webm_dash container, opus @132k (48000Hz), 4.96MiB
394          mp4        256x144    144p HDR   63k , mp4_dash container, av01.0.00M.10.0.110.09.16.09.0@  63k, 30fps, video only, 2.39MiB
160          mp4        256x144    144p   70k , mp4_dash container, avc1.4d400c@  70k, 30fps, video only, 2.64MiB
278          webm       256x144    144p   82k , webm_dash container, vp9@  82k, 30fps, video only, 3.07MiB
694          mp4        256x144    144p60 HDR  179k , mp4_dash container, av01.0.00M.10.0.110.09.16.09.0@ 179k, 60fps, video only, 6.73MiB
330          webm       256x144    144p60 HDR  212k , webm_dash container, vp9.2@ 212k, 60fps, video only, 7.96MiB
395          mp4        426x240    240p HDR  111k , mp4_dash container, av01.0.00M.10.0.110.09.16.09.0@ 111k, 30fps, video only, 4.16MiB
133          mp4        426x240    240p  156k , mp4_dash container, avc1.4d4015@ 156k, 30fps, video only, 5.86MiB
242          webm       426x240    240p  160k , webm_dash container, vp9@ 160k, 30fps, video only, 6.00MiB
695          mp4        426x240    240p60 HDR  409k , mp4_dash container, av01.0.01M.10.0.110.09.16.09.0@ 409k, 60fps, video only, 15.32MiB
331          webm       426x240    240p60 HDR  444k , webm_dash container, vp9.2@ 444k, 60fps, video only, 16.63MiB
396          mp4        640x360    360p HDR  220k , mp4_dash container, av01.0.01M.10.0.110.09.16.09.0@ 220k, 30fps, video only, 8.23MiB
134          mp4        640x360    360p  337k , mp4_dash container, avc1.4d401e@ 337k, 30fps, video only, 12.64MiB
243          webm       640x360    360p  343k , webm_dash container, vp9@ 343k, 30fps, video only, 12.84MiB
696          mp4        640x360    360p60 HDR  862k , mp4_dash container, av01.0.04M.10.0.110.09.16.09.0@ 862k, 60fps, video only, 32.28MiB
332          webm       640x360    360p60 HDR  954k , webm_dash container, vp9.2@ 954k, 60fps, video only, 35.70MiB
397          mp4        854x480    480p HDR  406k , mp4_dash container, av01.0.04M.10.0.110.09.16.09.0@ 406k, 30fps, video only, 15.19MiB
135          mp4        854x480    480p  563k , mp4_dash container, avc1.4d401f@ 563k, 30fps, video only, 21.08MiB
244          webm       854x480    480p  619k , webm_dash container, vp9@ 619k, 30fps, video only, 23.18MiB
697          mp4        854x480    480p60 HDR 1652k , mp4_dash container, av01.0.05M.10.0.110.09.16.09.0@1652k, 60fps, video only, 61.81MiB
333          webm       854x480    480p60 HDR 1848k , webm_dash container, vp9.2@1848k, 60fps, video only, 69.13MiB
398          mp4        1280x720   720p60 HDR 1151k , mp4_dash container, av01.0.08M.10.0.110.09.16.09.0@1151k, 60fps, video only, 43.09MiB
247          webm       1280x720   720p 1220k , webm_dash container, vp9@1220k, 30fps, video only, 45.67MiB
136          mp4        1280x720   720p 1540k , mp4_dash container, avc1.4d401f@1540k, 30fps, video only, 57.61MiB
302          webm       1280x720   720p60 1964k , webm_dash container, vp9@1964k, 60fps, video only, 73.48MiB
298          mp4        1280x720   720p60 2475k , mp4_dash container, avc1.4d4020@2475k, 60fps, video only, 92.60MiB
698          mp4        1280x720   720p60 HDR 3829k , mp4_dash container, av01.0.08M.10.0.110.09.16.09.0@3829k, 60fps, video only, 143.25MiB
334          webm       1280x720   720p60 HDR 4337k , webm_dash container, vp9.2@4337k, 60fps, video only, 162.26MiB
399          mp4        1920x1080  1080p60 HDR 2151k , mp4_dash container, av01.0.09M.10.0.110.09.16.09.0@2151k, 60fps, video only, 80.49MiB
303          webm       1920x1080  1080p60 3475k , webm_dash container, vp9@3475k, 60fps, video only, 130.01MiB
299          mp4        1920x1080  1080p60 4376k , mp4_dash container, avc1.64002a@4376k, 60fps, video only, 163.70MiB
699          mp4        1920x1080  1080p60 HDR 6358k , mp4_dash container, av01.0.09M.10.0.110.09.16.09.0@6358k, 60fps, video only, 237.83MiB
335          webm       1920x1080  1080p60 HDR 6738k , webm_dash container, vp9.2@6738k, 60fps, video only, 252.04MiB
400          mp4        2560x1440  1440p60 HDR 5529k , mp4_dash container, av01.0.12M.10.0.110.09.16.09.0@5529k, 60fps, video only, 206.83MiB
308          webm       2560x1440  1440p60 10376k , webm_dash container, vp9@10376k, 60fps, video only, 388.14MiB
700          mp4        2560x1440  1440p60 HDR 15170k , mp4_dash container, av01.0.12M.10.0.110.09.16.09.0@15170k, 60fps, video only, 567.45MiB
336          webm       2560x1440  1440p60 HDR 16231k , webm_dash container, vp9.2@16231k, 60fps, video only, 607.14MiB
401          mp4        3840x2160  2160p60 HDR 11707k , mp4_dash container, av01.0.13M.10.0.110.09.16.09.0@11707k, 60fps, video only, 437.93MiB
315          webm       3840x2160  2160p60 25573k , webm_dash container, vp9@25573k, 60fps, video only, 956.58MiB
701          mp4        3840x2160  2160p60 HDR 28033k , mp4_dash container, av01.0.13M.10.0.110.09.16.09.0@28033k, 60fps, video only, 1.02GiB
337          webm       3840x2160  2160p60 HDR 28869k , webm_dash container, vp9.2@28869k, 60fps, video only, 1.05GiB
18           mp4        640x360    360p  642k , avc1.42001E, 30fps, mp4a.40.2 (44100Hz), 24.03MiB
22           mp4        1280x720   720p 1669k , avc1.64001F, 30fps, mp4a.40.2 (44100Hz) (best)


  


  Then I search for a 1080p60 stream with avc1, which leads to format code 299 in this list and then choose a fitting audio stream, like format code 140.

  


  Through the script youtube-dl catches the links for the respective format code, which get joined with ffmpeg as a matroska file and the send to VLC.

  


  But this method lags ; in my opinion because it seems not to cache the stream, like MPV does. And there is not seeking option ; when I try to seek it pops back to the beginning.

  


  I tried it with adding -bufsize 6750k to the ffmpeg line, but that did not help either.
I also added the VLC option --sout-mux-caching 30000 where I thought VLC would get a bigger cache to buffer the stream, but that did not help, too.

  


  So, how could I play back this as a smooth stream in VLC ?

  


  Also, my solution might not the best to start with, so please don't take this as a reference, it was just an attempt by my side with my sparse knowledge how I would handle the situation.

  


  If there are better alternatives, you can of course post them, too. ;)

  


  ---

  


  I also want to add, that the script, which I posted above, works well, when I use the 134 format code with a far lesser resolution, so somewhere seems to be a bottleneck.

  


  ---

  


  Attachment 1 :

  


  Output with format codes 299+140 :

  


  Output

  


  Attachment 2 :

  


  Output with format codes 134+140 :

  


  Output

  


  ---

  


  Should the pastebin not work, here is an alternative link to the outputs.

  


  ---

  


  I terminated the program after several seconds with Ctrl-C, so the output won't be that big, thought it could help to find an answer on this.

  


  ---

  


  Just for reference :
After pressing Ctrl-C this line appeared :

  


  QObject::~QObject: Timers cannot be stopped from another thread


  


• How to override memory access functions (malloc, realloc etc) in libavformat with my own custom functions

  17 août 2020, par java_geek

  I am using libavformat-dev package to get some media file properties like bitrate, duration etc. However, I want to use my custom malloc, calloc, realloc functions in place of the system functions that libavformat uses. Is there a way of registering my custom functions in libavformat ?

  


• How to override memory access functions (malloc, realloc etc) in libavformat with my own custom functions

  23 décembre 2013, par java_geek

  I am using libavformat-dev package to get some media file properties like bitrate, duration etc. However, I want to use my custom malloc, calloc, realloc functions in place of the system functions that libavformat uses. Is there a way of registering my custom functions in libavformat ?