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Autres articles (74)
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Submit bugs and patches
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Sur d’autres sites (9523)
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Merge commit ’458446acfa1441d283dacf9e6e545beb083b8bb0’
15 novembre 2013, par Michael NiedermayerMerge commit ’458446acfa1441d283dacf9e6e545beb083b8bb0’
* commit ’458446acfa1441d283dacf9e6e545beb083b8bb0’ :
lavc : Edge emulation with dst/src linesizeConflicts :
libavcodec/cavs.c
libavcodec/h264.c
libavcodec/hevc.c
libavcodec/mpegvideo_enc.c
libavcodec/mpegvideo_motion.c
libavcodec/rv34.c
libavcodec/svq3.c
libavcodec/vc1dec.c
libavcodec/videodsp.h
libavcodec/videodsp_template.c
libavcodec/vp3.c
libavcodec/vp8.c
libavcodec/wmv2.c
libavcodec/x86/videodsp.asm
libavcodec/x86/videodsp_init.cChanges to the asm are not merged, they are left for volunteers or
in their absence for later.
The changes this merge introduces are reordering of the function
argumentsSee : face578d56c2d1375e40d5e2a28acc122132bc55
Merged-by : Michael Niedermayer <michaelni@gmx.at>- [DH] libavcodec/cavs.c
- [DH] libavcodec/diracdec.c
- [DH] libavcodec/h264.c
- [DH] libavcodec/hevc.c
- [DH] libavcodec/mpegvideo.c
- [DH] libavcodec/mpegvideo_enc.c
- [DH] libavcodec/mpegvideo_motion.c
- [DH] libavcodec/rv34.c
- [DH] libavcodec/snow.c
- [DH] libavcodec/svq3.c
- [DH] libavcodec/vc1dec.c
- [DH] libavcodec/videodsp.h
- [DH] libavcodec/videodsp_template.c
- [DH] libavcodec/vp3.c
- [DH] libavcodec/vp56.c
- [DH] libavcodec/vp8.c
- [DH] libavcodec/vp9.c
- [DH] libavcodec/wmv2.c
- [DH] libavcodec/x86/dsputil_mmx.c
- [DH] libavcodec/x86/videodsp_init.c
-
FFMPEG/DASH-LL creates audio and video chunks at different rates ; player is confused (404 errors)
26 mai 2021, par DannyI'm trying to create a MPEG-DASH "live" stream from a static file to test various low latency modes. The DASH muxer in FFmpeg creates two AdaptationSets, one for video chunks and one for audio chunks.


However, the audio and video chunk files are not created at the same rate (should they be ?). ie, here
stream0are the video chunks andstream1are the audio chunks. After a few seconds of running, the webroot directory contains :

chunk-stream0-00001.m4s chunk-stream1-00001.m4s 
chunk-stream0-00002.m4s chunk-stream1-00002.m4s 
chunk-stream0-00003.m4s chunk-stream1-00003.m4s 
chunk-stream0-00004.m4s chunk-stream1-00004.m4s 
 chunk-stream1-00005.m4s 
 chunk-stream1-00006.m4s 
 chunk-stream1-00007.m4s 
 chunk-stream1-00008.m4s 
 chunk-stream1-00009.m4s 
master.mpd 
init-stream0.m4s 
init-stream1.m4s 


The stream doesn't load (or play) on either
dash.jsor shaka-player and there are lots of404 (Not Found)errors for the video chunks. The player is requesting chunks from both stream0 and stream1 in sequence, ie, stream0-001 + stream1-001, then stream0-002 + stream1-002 and so on.

But since stream0 only goes from 001 to 004, there are lots of 404 errors as it tries to load stream0-005 through 009.


The gap gets wider after letting FFmpeg run for a while. eg, stream0 is 62 to 75 but stream1 is 174 to 187. Reloading the player page at this point fails with
dash.all.debug.js:15615 [2055][FragmentController] No video bytes to push or stream is inactive.and shows 404 errors stream0 chunk 188 (which doesn't exist yet !)



The FFmpeg command was adopted from DASH streaming from the top-down :


ffmpeg -re -i /mnt/swdevel/TestStreams/H264/ThreeHourMovie.mp4 \
-c:v libx264 -x264-params keyint=120:scenecut=0 -b:v 1M -c:a copy \
-f dash -dash_segment_type mp4 \
 -seg_duration 2 \
 -target_latency 3 \
 -frag_type duration \
 -frag_duration 0.2 \
 -window_size 10 \
 -extra_window_size 3 \
 -streaming 1 \
 -ldash 1 \
 -use_template 1 \
 -use_timeline 0 \
 -write_prft 1 \
 -fflags +nobuffer+flush_packets \
 -format_options "movflags=+cmaf" \
 -utc_timing_url "/pelican/testPlayers/time.php" \
 master.mpd


And the
dash.jsplayer code is very simple :

const srcUrl = "../ottWebRoot/playerTest/master.mpd"; 

var player = dashjs.MediaPlayer().create();

let autoPlay = false;
player.initialize(document.querySelector("#videoTagId"), srcUrl, autoPlay);

player.updateSettings(
{
 streaming :
 {
 lowLatencyEnabled : true,
 liveDelay : 2,
 jumpGaps : true,
 jumpLargeGaps : true,
 smallGapLimit : 1.5,
 }
});


To provide the
UTCTimingelement in the manifest, the smalltime.phpURL returns a UTC time from the web server :

<?php
 print gmdate("Y-m-d\TH:i:s\Z");
?>


(It also shows 404 errors for the latest stream1/audio chunk, that's likely a different problem)


I'm not sure what to try next. Any and suggestions greatly appreciated.


EDIT I


The suggestion by @Anonymous Coward to change the key interval improved things a lot. The chunks for stream0 and stream1 are in lock-step and have identical sequence numbers.


However, there are still many 404 errors, both on initial page load (without pressing play) and during playback.


I ran
watch -n 1 ls -lt code> and compared side-by-side to the errors in the browser console. It's hard to compare but it <em>looks</em> like the browser is trying to fetch files "on the play edge" which haven't yet been created by FFmpeg. See the pic below.

How do I instruct the browser to wait just a bit more before fetching the edge chunks ?




EDIT II


Using
shaka-playerinstead ofdash.jsplays properly without 404 errors. Configured as :

player.configure(
 {
 streaming: 
 {
 lowLatencyMode: true,
 inaccurateManifestTolerance: 0,
 rebufferingGoal: 0.1,
 }
 
 });


Client


- 

- MacOS 10.12
- dash.js latest 3.2.2
- Chrome 79, Safari 12, FireFox v ?








Server


- 

- Apache 2.4.37
- PHP 7.2.4 (for time function only)
- Centos 8








(For reference, here is the mpd file generated by FFmpeg)


<?xml version="1.0" encoding="utf-8"?>
<mpd xmlns="urn:mpeg:dash:schema:mpd:2011" profiles="urn:mpeg:dash:profile:isoff-live:2011" type="dynamic" minimumupdateperiod="PT500S" availabilitystarttime="2021-05-24T14:50:00.263Z" publishtime="2021-05-24T15:22:45.335Z" timeshiftbufferdepth="PT50.0S" maxsegmentduration="PT2.0S" minbuffertime="PT5.0S">
 <programinformation>
 </programinformation>
 <servicedescription>
 <latency target="3000" referenceid="0"></latency>
 </servicedescription>
 <period start="PT0.0S">
 <adaptationset contenttype="video" startwithsap="1" segmentalignment="true" bitstreamswitching="true" framerate="24/1" maxwidth="1280" maxheight="682" par="15:8" lang="und">
 <resync dt="200000" type="0"></resync>
 <representation mimetype="video/mp4" codecs="avc1.64081f" bandwidth="1000000" width="1280" height="682" sar="1023:1024">
 <producerreferencetime inband="true" type="captured" wallclocktime="2021-05-24T14:50:00.263Z" presentationtime="0">
 <utctiming schemeiduri="urn:mpeg:dash:utc:http-xsdate:2014" value="/pelican/testPlayers/time.php"></utctiming>
 </producerreferencetime>
 <resync dt="5000000" type="1"></resync>
 <segmenttemplate timescale="1000000" duration="2000000" availabilitytimeoffset="1.800" availabilitytimecomplete="false" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="1">
 </segmenttemplate>
 </representation>
 </adaptationset>
 <adaptationset contenttype="audio" startwithsap="1" segmentalignment="true" bitstreamswitching="true" lang="und">
 <resync dt="200000" type="0"></resync>
 <representation mimetype="audio/mp4" codecs="mp4a.40.2" bandwidth="116317" audiosamplingrate="48000">
 <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"></audiochannelconfiguration>
 <producerreferencetime inband="true" type="captured" wallclocktime="2021-05-24T14:50:00.306Z" presentationtime="0">
 <utctiming schemeiduri="urn:mpeg:dash:utc:http-xsdate:2014" value="/pelican/testPlayers/time.php"></utctiming>
 </producerreferencetime>
 <resync dt="21333" type="1"></resync>
 <segmenttemplate timescale="1000000" duration="2000000" availabilitytimeoffset="1.800" availabilitytimecomplete="false" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="1">
 </segmenttemplate>
 </representation>
 </adaptationset>
 </period>
 <utctiming schemeiduri="urn:mpeg:dash:utc:http-xsdate:2014" value="/pelican/testPlayers/time.php"></utctiming>
</mpd>


-
SOX got nothing from SoundFlower
12 septembre 2016, par xiaoseFor some reason on some comps SoundFlower does not catch audio.
I.e. there are SoundFlower but when I switch input\output to the SoundFlower I cannot get any sound. I have got only not empty file without any sound.Okay, how I try to get the sound...
Just FYI :
$ system_profiler SPSoftwareDataType
Software:
System Software Overview:
System Version: OS X 10.10.5 (14F1912)
Kernel Version: Darwin 14.5.0
Boot Volume: Macintosh HD
Boot Mode: Normal
Computer Name: Craig Computer
User Name: Craig (craigm)
Secure Virtual Memory: Enabled
Time since boot: 1 day22:12Gonna check is AVFoundation works :
$ ./ffmpeg -h demuxer=avfoundation
Demuxer avfoundation [AVFoundation input device]:
AVFoundation input device AVOptions:
-list_devices <int> .D...... list available devices (from 0 to 1) (default false)
true .D......
false .D......
-video_device_index <int> .D...... select video device by index for devices with same name (starts at 0) (from -1 to INT_MAX) (default -1)
-audio_device_index <int> .D...... select audio device by index for devices with same name (starts at 0) (from -1 to INT_MAX) (default -1)
-pixel_format .D...... set pixel format (default yuv420p)
-framerate .D...... set frame rate (default "ntsc")
-video_size .D...... set video size
-capture_cursor <int> .D...... capture the screen cursor (from 0 to 1) (default 0)
-capture_mouse_clicks <int> .D...... capture the screen mouse clicks (from 0 to 1) (default 0)
</int></int></int></int></int>Gonna get list of AVFoundation audio devices :
$ ./ffmpeg -f avfoundation -list_devices true -i ’’
ffmpeg version 3.1.1-tessus Copyright (c) 2000-2016 the FFmpeg developers
built with Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)
configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --as=yasm --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzmq --enable-version3 --disable-ffplay --disable-indev=qtkit --disable-indev=x11grab_xcb
libavutil 55. 28.100 / 55. 28.100
libavcodec 57. 48.101 / 57. 48.101
libavformat 57. 41.100 / 57. 41.100
libavdevice 57. 0.101 / 57. 0.101
libavfilter 6. 47.100 / 6. 47.100
libswscale 4. 1.100 / 4. 1.100
libswresample 2. 1.100 / 2. 1.100
libpostproc 54. 0.100 / 54. 0.100
[AVFoundation input device @ 0x7fda40421000] AVFoundation video devices:
[AVFoundation input device @ 0x7fda40421000] [0] Built-in iSight
[AVFoundation input device @ 0x7fda40421000] [1] Capture screen 0
[AVFoundation input device @ 0x7fda40421000] AVFoundation audio devices:
[AVFoundation input device @ 0x7fda40421000] [0] Soundflower (64ch)
[AVFoundation input device @ 0x7fda40421000] [1] Built-in Microphone
[AVFoundation input device @ 0x7fda40421000] [2] Soundflower (2ch)
[AVFoundation input device @ 0x7fda40421000] [3] Built-in Input
: Input/output errorOkay, we have SoundFlower in devices :
[AVFoundation input device @ 0x7fda40421000] [2] Soundflower (2ch)
Then I run AppleScript which gonna switch to the "SoundFlower (2ch)" :
enableSF("input")
enableSF("output")
Where enableSF(stdname) is :
on enableSF(stdname)
tell application "System Preferences"
-- activate
tell anchor stdname of pane "com.apple.preference.sound" to reveal
tell application "System Events"
tell application process "System Preferences"
tell tab group 1 of window 1
delay 2
set rowslist to selected of row of table 1 of scroll area 1
set counter to 0
repeat with id in rowslist
set counter to counter + 1
set rowName to (value of text field 1 of row counter of table 1 of scroll area 1)
set output to stdname & " " & rowName
set scrpt to "echo \"" & output & "\" >> ~/Desktop/ds.log"
do shell script scrpt
if (rowName is equal to "Soundflower (2ch)") then
set selected of row counter of table 1 of scroll area 1 to true
set output to "
!!! FOUND SF for " & stdname & " " & rowName
set scrpt to "echo \"" & output & "\" >> ~/Desktop/ds.log"
log output
do shell script scrpt
exit repeat
end if
end repeat
end tell
end tell
end tell
end tell
end enableSFIn result I have got this :
input Internal Microphone
input Line In
input Digi CoreAudio Device
input Soundflower (2ch)
!!! FOUND SF for input Soundflower (2ch)
output Headphones
output Digi CoreAudio Device
output Soundflower (2ch)
!!! FOUND SF for output Soundflower (2ch)It means that we switch to the SoundFlower. Actually the same can be done by hands, but the script is more reliable as for me.
Okay, next we can try to save some audio via SOX :
$ /Applications/sox-14.3.2/sox -d /Desktop/out.wav
Input File : 'default' (coreaudio)
Channels : 2
Sample Rate : 44100
Precision : 32-bit
Sample Encoding: 32-bit Signed Integer PCM
In:0.00% 00:00:00.00 [00:00:00.00] Out:0 [ | ] Clip:0
...
...
...
In:0.00% 00:00:02.51 [00:00:00.00] Out:106k [ | ] Clip:0
...
...
...
In:0.00% 00:00:11.80 [00:00:00.00] Out:516k [ | ] Clip:0 /Applications/sox-14.3.2/sox WARN coreaudio: coreaudio: unhandled buffer overrun. Data discarded.
...
...
...
In:0.00% 00:00:12.35 [00:00:00.00] Out:545k [ | ] Clip:0 /Applications/sox-14.3.2/sox WARN coreaudio: coreaudio: unhandled buffer overrun. Data discarded.
...
...
...
In:0.00% 00:00:13.28 [00:00:00.00] Out:582k [ | ] Clip:0
Aborted.And, as you can see, the SOX gives me an empty file. Rather, it gives the data, but there is no sound.
This happens on all OS from 10.10 to 10.11.6. Normal output should be this type :
In:0.00% 00:00:00.28 [00:00:00.00] Out:8.19k [======|======] Clip:0
...
...
...
In:0.00% 00:00:04.37 [00:00:00.00] Out:188k [ -====|===== ] Hd:1.1 Clip:0
...
...
...
In:0.00% 00:00:08.82 [00:00:00.00] Out:385k [======|=====-] Hd:1.1 Clip:0
In:0.00% 00:00:09.01 [00:00:00.00] Out:393k [-=====|=====-] Hd:1.1 Clip:0
In:0.00% 00:00:09.20 [00:00:00.00] Out:401k [======|======] Hd:1.1 Clip:0
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