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La conservation du net art au musée. Les stratégies à l’œuvre
26 mai 2011
Mis à jour : Juillet 2013
Langue : français
Type : Texte
Autres articles (97)
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Multilang : améliorer l’interface pour les blocs multilingues
18 février 2011, parMultilang est un plugin supplémentaire qui n’est pas activé par défaut lors de l’initialisation de MediaSPIP.
Après son activation, une préconfiguration est mise en place automatiquement par MediaSPIP init permettant à la nouvelle fonctionnalité d’être automatiquement opérationnelle. Il n’est donc pas obligatoire de passer par une étape de configuration pour cela. -
Gestion des droits de création et d’édition des objets
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Sur d’autres sites (10412)
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Fragmented MP4 not playing in ffplay/QuickTime/Safari, but in VLC
6 août 2020, par Stack64I encoded a fMP4-Video (HEVC) in Swift using VideoToolbox and CoreMedia. The resulting fragmented MP4 is only playing in VLC.


The library I am using to write the fMP4 is an HEVC-adapted version of this GitHub-Project : https://github.com/krad/morsel


Process of encoding and writing :


- 

- VideoToolbox : Encoding
SampleBuffer
from the camera (VTCompressionSession
, as described in WWDC 2014 Session 513) - Using
CoreMedia
-Functions (e.g.CMVideoFormatDescriptionGetHEVCParameterSetAtIndex
,CMVideoFormatDescriptionGetDimensions
) to get the encoded streams metadata. I am writing the content ofCMFormatDescriptionGetExtension(description, extensionKey: "SampleDescriptionExtensionAtoms" as CFString)["hvcC"]
directly to the hvcC box. This box is obviously written correctly, when I alter one bit of the box of the mp4, QuickTime throws an error. - I am appending the sample buffer data to the morsel-library, which manages fragmentation and creates the moof and mdat atoms.








The result file is playable in VLC, when I just let the playback "run" without doing anything. When I scroll the time in VLC, VLC crashes and the playback stops.


It is also sort of "playable" in Safari and QuickTime (no error message shown, the playback window opens and the correct length of the file is shown, I can even change to playback time / play/pause, but there is no video shown. The window remains empty. And that is the problem I have. I need to get an fMP4 running in Safari and QuickTime.


The file is not playing at all in ffplay (same problem when converting with ffmpeg). The line where the playback time is shown remains
nan M-V: nan fd= 0 aq= 0KB vq= 0KB sq= 0B f=0/0
, there are no error messages. The playback just does not start.
When playing the file with ffplay, this is the output :

ffplay version 4.3 Copyright (c) 2003-2020 the FFmpeg developers
 built with Apple clang version 11.0.3 (clang-1103.0.32.62)
 configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3_2 --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-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-videotoolbox --disable-libjack --disable-indev=jack
 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, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':
 Metadata:
 major_brand : mp42
 minor_version : 1
 compatible_brands: mp41mp42isomhlsf
 creation_time : 2020-08-03T20:41:08.000000Z
 Duration: N/A, bitrate: N/A
 Stream #0:0(und): Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv), 1920x1080, SAR 1:1 DAR 16:9, 1000000000.00 tbr, 1000000000.00 tbn, 1000000000.00 tbc (default)
 Metadata:
 creation_time : 2020-08-03T20:41:08.000000Z
 handler_name : video
 nan M-V: nan fd= 0 aq= 0KB vq= 0KB sq= 0B f=0/0 



My file has this structure :


ftyp
moov
 mvhd
 trak
 tkhd
 mdia
 mdhd
 hdlr
 minf
 vmhd
 dinf
 dref
 stbl
 stsd
 stts
 stsc
 stsz
 stco
 mvex
 trex
moof-(1)
mdat
moof-(2)
mdat 
...



The result file I want to create should be like the fMP4 served within this HLS playlist : (Example : https://developer.apple.com/streaming/examples/advanced-stream-hevc.html, Playlist : https://devstreaming-cdn.apple.com/videos/streaming/examples/bipbop_adv_example_hevc/master.m3u8)
This file has the following structure :


ftyp
moov
 mvhd
 trak
 tkhd
 mdia
 mdhd
 hdlr
 minf
 vmhd
 dinf
 dref
 stbl
 stsd
 stts
 stsc
 stsz
 stco
 trak (same structure as above)
 mvex
 trex
moof-(1)
mdat
moof-(2)
mdat 
...



This file from Apple plays perfectly in ffmpeg and QuickTime/Safari. Except for the second
trak
atom, it has the same structure.

The "good" file is : https://devstreaming-cdn.apple.com/videos/streaming/examples/bipbop_adv_example_hevc/v14/main.mp4 (It is intended for use in a HLS Playlist I've downloaded it with curl)


The "bad" file is : https://www.transfernow.net/ddl/fmp4_bad (link should work, tested it just now :) ). The video shows a slowly rotating sheet of paper.


Any suggestions what the problem with my file is ?
Thanks in advance !


- VideoToolbox : Encoding
-
FFMPEG doesn't convert from m4v files
8 février 2014, par MattDI am trying to transcode an m4v file from iTunes so I can play it on Windows or XBox. I am running ffmpeg from Windows. Is there some -vcodec I need to specify or something I need to install ? Here's the command I'm running and the error I'm getting.
Edit : Complete output
ffmpeg version N-60393-g9707b53 Copyright (c) 2000-2014 the FFmpeg developers
built on Feb 6 2014 22:07:13 with gcc 4.8.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
libavutil 52. 63.101 / 52. 63.101
libavcodec 55. 49.101 / 55. 49.101
libavformat 55. 30.100 / 55. 30.100
libavdevice 55. 7.100 / 55. 7.100
libavfilter 4. 1.102 / 4. 1.102
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 17.104 / 0. 17.104
libpostproc 52. 3.100 / 52. 3.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000268f620] stream 0, timescale not set
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000268f620] Stream #3: not enough frames to estimate rate; consider increasing probesize
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000268f620] Stream #4: not enough frames to estimate rate; consider increasing probesize
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000268f620] Could not find codec parameters for stream 1 (Video: none (drmi / 0x696D7264), 960x718, 3957 kb/s): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000268f620] Could not find codec parameters for stream 2 (Audio: none (drms / 0x736D7264), 48000 Hz, 5.1(side), 384 kb/s): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000268f620] Could not find codec parameters for stream 3 (Subtitle: none (p608 / 0x38303670), 1280x718, 0 kb/s): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Y:02 The Empty Hearse (HD).m4v':
Metadata:
major_brand : M4V
minor_version : 0
compatible_brands: M4V mp42isom
creation_time : 2014-01-13 18:51:33
title : [...]
artist : [...]
album : [...]
genre : Drama
track : 2/8
disc : 1/1
date : 2014-01-19T08:00:00Z
description : [...]
hd_video : 1
network : PBS
show : Sherlock
episode_id : 1
season_number : 3
episode_sort : 2
media_type : 10
synopsis : [...]
Duration: 01:26:28.70, start: 0.000000, bitrate: 4505 kb/s
Stream #0:0(eng): Audio: aac (drms / 0x736D7264), 48000 Hz, stereo, fltp, 156 kb/s (default)
Metadata:
creation_time : 2014-01-13 18:51:33
handler_name : Apple Sound Media Handler
Stream #0:1(eng): Video: none (drmi / 0x696D7264), 960x718, 3957 kb/s, SAR 4:3 DAR 640:359, 25 fps, 25 tbr, 2500 tbn, 2500 tbc (default)
Metadata:
creation_time : 2014-01-13 18:51:33
handler_name : Apple Video Media Handler
Stream #0:2(eng): Audio: none (drms / 0x736D7264), 48000 Hz, 5.1(side), 384 kb/s
Metadata:
creation_time : 2014-01-13 18:51:33
handler_name : Apple Sound Media Handler
Stream #0:3(eng): Subtitle: none (p608 / 0x38303670), 1280x718, 0 kb/s (default)
Metadata:
creation_time : 2014-01-13 18:51:33
handler_name : Apple Closed Caption Media Handler
Stream #0:4: Video: mjpeg, yuvj444p(pc), 640x640 [SAR 300:300 DAR 1:1], 90k tbr, 90k tbn, 90k tbc
File 'Sherlock.wmv' already exists. Overwrite ? [y/N] [buffer @ 0000000005fc5760] Unable to parse option value "-1" as pixel format
Last message repeated 1 times
[buffer @ 0000000005fc5760] Error setting option pix_fmt to value -1.
[graph 0 input from stream 0:1 @ 00000000027d7da0] Error applying options to the filter.
Error opening filters! -
pjsip build for iOS 5, won't make
14 novembre 2013, par user1423591I retrieved the latest build from the SVN trunk on Friday and attempted to build following the directions on the getting started wiki.
make
dep seems to execute without any problems, but make fails on Samples.mak. It appears there are no rules to make any of the samples when the platform is "arm-apple-darwin9".If I open the
Xcode
project at this point,libavcodec
and all it's related libraries are missing as well asLibSDL
. There's not mention of a requirement to install SDL andffmpeg
beforehand, so not sure what to do there.