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Les Miserables
9 décembre 2019, par
Mis à jour : Décembre 2019
Langue : français
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VideoHandle
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Somos millones 1
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Mis à jour : Juin 2015
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Pourquoi Obama lit il mes mails ?
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IMG 0222
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Mis à jour : Octobre 2013
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Autres articles (25)
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Soumettre bugs et patchs
10 avril 2011Un logiciel n’est malheureusement jamais parfait...
Si vous pensez avoir mis la main sur un bug, reportez le dans notre système de tickets en prenant bien soin de nous remonter certaines informations pertinentes : le type de navigateur et sa version exacte avec lequel vous avez l’anomalie ; une explication la plus précise possible du problème rencontré ; si possibles les étapes pour reproduire le problème ; un lien vers le site / la page en question ;
Si vous pensez avoir résolu vous même le bug (...) -
Installation en mode standalone
4 février 2011, parL’installation de la distribution MediaSPIP se fait en plusieurs étapes : la récupération des fichiers nécessaires. À ce moment là deux méthodes sont possibles : en installant l’archive ZIP contenant l’ensemble de la distribution ; via SVN en récupérant les sources de chaque modules séparément ; la préconfiguration ; l’installation définitive ;
[mediaspip_zip]Installation de l’archive ZIP de MediaSPIP
Ce mode d’installation est la méthode la plus simple afin d’installer l’ensemble de la distribution (...) -
Gestion des droits de création et d’édition des objets
8 février 2011, parPar défaut, beaucoup de fonctionnalités sont limitées aux administrateurs mais restent configurables indépendamment pour modifier leur statut minimal d’utilisation notamment : la rédaction de contenus sur le site modifiables dans la gestion des templates de formulaires ; l’ajout de notes aux articles ; l’ajout de légendes et d’annotations sur les images ;
Sur d’autres sites (6294)
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Dreamcast SD Adapter and DreamShell
31 décembre 2014, par Multimedia Mike — Sega DreamcastNope ! I’m never going to let go of the Sega Dreamcast hacking. When I was playing around with Dreamcast hacking early last year, I became aware that there is such a thing as an SD card adapter for the DC that plugs into the port normally reserved for the odd DC link cable. Of course I wanted to see what I could do with it.
The primary software that leverages the DC SD adapter is called DreamShell. Working with this adapter and the software requires some skill and guesswork. Searching for these topics tends to turn up results from various forums where people are trying to cargo-cult their way to solutions. I have a strange feeling that this post might become the unofficial English-language documentation on the matter.
Use Cases
What can you do with this thing ? Undoubtedly, the primary use is for backing up (ripping) the contents of GD-ROMs (the custom optical format used for the DC) and playing those backed up (ripped) copies. Presumably, users of this device leverage the latter use case more than the former, i.e., download ripped games, load them on the SD card, and launch them using DreamShell.However, there are other uses such as multimedia playback, system exploration, BIOS reprogramming, high-level programming, and probably a few other things I haven’t figured out yet.
Delivery
I put in an order via the dc-sd.com website and in about 2 short months, the item arrived from China. This marked my third lifetime delivery from China and curiously, all 3 of the shipments have pertained to the Sega Dreamcast.
I thought it was very interesting that this adapter came in such complete packaging. The text is all in Chinese, though the back states “Windows 98 / ME / 2000 / XP, Mac OS 9.1, LINUX2.4”. That’s what tipped me off that they must have just cannibalized some old USB SD card readers and packaging in order to create these. Closer inspection of the internals through the translucent pink case confirms this.
Usage
According to its change log, DreamShell has been around for a long time with version 1.0.0 released in February of 2004. The current version is 4.0.0 RC3. There are several downloads available :- DreamShell 4.0 RC 3 CDI Image
- DreamShell 4.0 RC 3 + Boot Loader
- DreamShell 4.0 RC 3 + Core CDI image
Option #2 worked for me. It contains a CDI disc image and the DreamShell files in a directory named DS/.
Burn the CDI to a CD-R in the normal way you would burn a bootable Dreamcast disc from a CDI image. This is open-ended and left as an exercise to the reader, since there are many procedures depending on platform. On Linux, I used a small script I found once called burncdi-dc.sh.
Then, copy the contents of the DS/ folder to an SD card. As for filesystem, FAT16 and FAT32 are both known to work. The files in DS/ should land in the root of the SD card ; the folder DS/ should not be in the root.
Plug the SD card into the DC SD adapter and plug the adapter in the link cable port on the back of the Dreamcast. Then, boot the disc. If it works, you will see this minor corruption of the usual Sega licensing screen :
Then, there will be a brief white-on-black text screen that explains the booting process :
Then, there will be the main DreamShell logo :
Finally, you will land on the DreamShell main desktop :
Skepticism
At first, I was supremely skeptical of the idea that this SD adapter could perform speedily enough to play games reasonably. This was predicated on the observation that my DC coder’s cable that I used to use for homebrew development could not transfer faster than 115200 bits/second, amounting to about 11 kbytes/sec. I assumed that this was a fundamental limitation of the link port.In fact, I ripped a few of my Dreamcast discs over a decade ago and still have those rips lying around. So I copied the ISO image of Resident Evil : Code Veronica — the game I personally played most on the DC — to the SD card (anywhere works) and used the “ISO loader” icon seen on the desktop above to launch the game.
It works :
The opening FMV plays at full speed. Everything loads as fast as I remember. I was quite surprised.
Digression : My assumptions about serial speeds have often been mistaken. 10 years ago, I heard stories about how we would soon be able to watch streaming video on our cell phones. I scoffed because I thought the 56K limitation of dialup modems was some sort of fundamental speed-of-light type of limitation for telephony bandwidth, wired or wireless.
The desktop menu also includes a ‘speedtest’ tool that profiles the write and read performance of your preferred storage medium. For my fastest SD card (a PNY 2 GB card) :
This is probably more representative of the true adapter bandwidth as reading and writing is a good deal faster through more modern interfaces on PC and Mac with this same card.
Look at the other options on the speedtest console. Hard drive ? Apparently, it’s possible, but it requires a good deal more hardware hacking than just purchasing this SD adapter.
Ripping
As you can see from the Resident Evil screenshot, playing games works quite nicely. How about ripping ? I’m pleased to say that DreamShell has a beautiful ripping interface :
Enter a name for the disc (or read the disc label), select the storage medium, and let it, well, rip. It indicates which track it’s working on and the Sega logo acts as a progress bar, shading blue as the track rip progresses.
I’m finally, efficiently, archiving that collection of Sega Dreamcast demo discs ; I’m hoping they’ll eventually find a home at the Internet Archive. How is overall ripping performance ? Usually about 38-40 minutes to rip a full 900-1000 MB. That certainly beats the 27-28 hours that were required when I performed the ripping at 11 kbytes/sec via the DC coders cable.
All is well until I get a sector reading error :
That’s when it can come in handy to have 3 DC consoles (see ?! not crazy !).
Other Uses
There’s a file explorer. You can browse the filesystem of the SD card, visual memory unit, or the CD portion of the GD-ROM (would be more useful if it accessed the GD area). There are FFmpeg files included. So I threw a random Cinepak file and random MPEG-1 file at it to see what happens. MPEG-1 didn’t do anything, but this Cinepak file from some Sierra game played handily :
If you must enter strings, it helps to have a Dreamcast keyboard (which I do). Failing that, here’s a glimpse of the onscreen keyboard that DreamShell equips :
Learning to use it is a game in itself.
There is an option of installing DreamShell in the BIOS. I did not attempt this. I don’t know if it’s possible (not like there’s a lot of documentation)– perhaps a custom BIOS modchip is needed. But here’s what the screen looks like :
There is also a plain console to interact with (better have a physical keyboard). There are numerous file manipulation commands and custom system interaction commands. I see one interesting command called ‘addr’ that looks useful for dumping memory regions to a file.
A Lua language interpreter is also built in. I would love to play with this if I could ascertain whether DreamShell provided Dreamcast-specific APIs.
Tips And Troubleshooting
I have 3 Dreamcast consoles, affectionately named Terran, Protoss, and Zerg after the StarCraft II stickers with which they are adorned. Some seem to work better than others. Protoss seemed to be able to boot the DreamShell disc more reliably than the others. However, I was alarmed when it couldn’t boot one morning when it was churning the previous day.I think the problem is that it was just cold. That seemed to be the issue. I put in a normal GD-ROM and let it warm up on that disc for awhile and then DreamShell booted fine. So that’s my piece of cargo-culting troubleshooting advice.
-
How to take screenshots of streamers using the Twitch API
10 décembre 2020, par oo92My goal is to create a dataset of gameplays on Twitch using the API. How I want to do it is this :


- 

- Get a list of live streams using the API.
- Use streamlink and ffmpeg on Python to take the screenshots through the Stream source






To get the streams, I have the following code thanks to a SO user :


from twitch import TwitchClient

client = TwitchClient(client_id='<my client="client">')
streams = client.streams.get_live_streams(limit=100)

print(streams)
</my>


The output is this. Its a lot larger, I just made it shorter... :


[{'id': 40889579422, 'game': 'Among Us', 'broadcast_platform': 'live', 'community_id': '', 'community_ids': [], 'viewers': 74594, 'video_height': 1080, 'average_fps': 60, 'delay': 0, 'created_at': datetime.datetime(2020, 12, 9, 23, 53, 34), 'is_playlist': False, 'stream_type': 'live', 'preview': {'small': 'https://static-cdn.jtvnw.net/previews-ttv/live_user_sykkuno-80x45.jpg', 'medium': 'https://static-cdn.jtvnw.net/previews-ttv/live_user_sykkuno-320x180.jpg', 'large': 'https://static-cdn.jtvnw.net/previews-ttv/live_user_sykkuno-640x360.jpg', 'template': 'https://static-cdn.jtvnw.net/previews-ttv/live_user_sykkuno-{width}x{height}.jpg'}, 'channel': {'mature': False, 'status': 'amongus at 4 !!', 'broadcaster_language': 'en', 'broadcaster_software': '', 'display_name': 'Sykkuno', 'game': 'Among Us', 'language': 'en', 'id': 26154978, 'name': 'sykkuno', 'created_at': datetime.datetime(2011, 11, 15, 1, 29, 29, 140794), 'updated_at': datetime.datetime(2020, 12, 10, 0, 35, 50, 916363), 'partner': True, 'logo': 'https://static-cdn.jtvnw.net/jtv_user_pictures/sykkuno-profile_image-6ab1e70e07e29e9b-300x300.jpeg', 'video_banner': 'https://static-cdn.jtvnw.net/jtv_user_pictures/4b654ce5-58dc-4fa6-b77c-7250bb2d5269-channel_offline_image-1920x1080.png', 'profile_banner': 'https://static-cdn.jtvnw.net/jtv_user_pictures/1caee146-3323-4d45-9907-96c20c224d3e-profile_banner-480.png', 'profile_banner_background_color': '', 'url': 'https://www.twitch.tv/sykkuno', 'views': 23590965, 'followers': 1928724, 'broadcaster_type': '', 'description': 'Hi ! ', 'private_video': False, 'privacy_options_enabled': False}}, ... 



First, I want to know how I can iterate through the JSON to get the channel name using the
id
. I tried to do it on my own but it said that it isn't subscriptable.

Second, I have the following code that tries to use
ffmpeg
to get a screenshot of the stream through its source :

import streamlink, os

# This code connects to the streamer's source
# Get the Twitch API to work so you can add the streamer's name at the end of the link
username = 'Sykkuno'
streams = streamlink.streams('http://twitch.tv/' + username)

# Stream source
stream = streams["best"].url

# Directory where the screenshots will be saved
dir_path = os.getcwd() + '/' + username

# number of streamers
streamers = 1

os.system('ffmpeg -i ' + stream +' -r 0.5 -f image2 ${dir}/output_%09d.jpg')



But that is throwing the following error :


ffmpeg version 4.1.3-0ppa1~18.04 Copyright (c) 2000-2019 the FFmpeg developers
 built with gcc 7 (Ubuntu 7.3.0-27ubuntu1~18.04)
 configuration: --prefix=/usr --extra-version='0ppa1~18.04' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-nonfree --enable-libfdk-aac --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
 libavutil 56. 22.100 / 56. 22.100
 libavcodec 58. 35.100 / 58. 35.100
 libavformat 58. 20.100 / 58. 20.100
 libavdevice 58. 5.100 / 58. 5.100
 libavfilter 7. 40.101 / 7. 40.101
 libavresample 4. 0. 0 / 4. 0. 0
 libswscale 5. 3.100 / 5. 3.100
 libswresample 3. 3.100 / 3. 3.100
 libpostproc 55. 3.100 / 55. 3.100
[hls,applehttp @ 0x557212854940] Opening 'https://video-edge-c2a360.yto01.abs.hls.ttvnw.net/v1/segment/CuAErHgNDEVK3cqjkRZLcz4El99YD2ZSy9tgtjc3ZTrPuN4584-GY3DKYO3MFCBt9M3v8_7IfHAlLvHeUn2wq4d-VC7u4Zv2-k1Bee9IPmIXbFQLZFKrYiT98OTzFMDaElsEZ9Sr4MXz6FoAC1yXhhZ0MYahZVnZa1Tuqnn217nN_rN8wr7kdScBIir_Uo1s2C_I8_54mi2uzdgxB9AYj0a0kG2UtdPkUVA6Qc7XIZ0nUhEeObEf80N0uW9ZU6WHpO3V6G9RD0VkmwUexDWk9MaLy1NJuvLSzRaMfOmKxhrzn3UDoY4CrQN11KOnHYCiCOfvhZmMKzSqtiA8YP0Q9iS03eZZhPQ3WxBHWhd6VeZ0btNeeoudGX73EBIj4ujZnKWKfPiN8K_HLj5FZWqQ5m_4Q1llQlnSAfmhzXR9PHAkz8nxRVcFR-tFokGzFEfkZGHngPNz9boLmo4KHx6404rocPUcXbTHkYsWXZwFC356AhfrNn6x0JYHGfcDpRsEFebLQljEpCyhnNOHFEf9b7Ipeiy521cCupzoEz1uMrzW77h9FJwn0GwvY3jp2KwRXJMvArYwiUHccBmfW7ZDLO9vH7eJGUnAzoy586KMSPLVeLxWMWRDfKkAcI8vYXOIuxNb_MZKm2O_dcoFrDDta5TZn-MLjFquT47P9NbXxlTTJfimlYyMG17SPoW3KJVtAJmjoj0GZ1ehftLJWz1Qgd8zmg40u4g8fz867eCHW_Tiv65yd6qJZD-_bD3G916fm3KeA9bPyhalTD99CWhQL7f0apCfX_6IiQElgPT6kOrFI-ISEG4GdhIpFi4ubzSx29pm7H4aDIXx6BAI5ziHVMPbrg.ts' for reading
[hls,applehttp @ 0x557212854940] Opening 'https://video-edge-c2a360.yto01.abs.hls.ttvnw.net/v1/segment/CuIECWLarz2I5hNCtGLSTDXbCIgahI91KOHXVmPHddzZediyiVbcicZpGakO99CJp1cK_6OnmOKBzZ3sn3KogNyPVRqSy32IpanlyPPUTz23TojfR5DTmJa3zampOzVMfETvvPEpj58-kGhQeQQGtK1zLV2h465RElCLkmc7SeWbXEZ5j6IQ38OVFZ0vdcMHVTNPtJaY7509bE196-9-5YYFiET_-kdkS2X6_lhVQBZrq45PBxApTzeLkDx9ZtGQx78dLr_tZepww_uVnJTwxI_TA3tU8z5_w8ml6rh0GK1W6lTlvuDkPKAwIDLvG736MtbPGz9cFPoRAFQxD3QSwAM-bO1grvWlNsOUDUYLXLNjuejmz8xmRpeE0pqJYxUboRZpxrPXTi52HcX8lpGT4Lx2z6hJcoi9npQttK58HDSHQ3cYH3rlNsYV_RlZ3F-u-fZSn8Em67-vAYeXAMaBe9xxv0Zu2n1TrdPICMyGmk-VgLK788IeDhxqM441GONGLxo6AF8RE5_OawTf9n_MVzImsX4LMn0oN8e8w6mjk7YDuNdA4mEl99Erg8xMdX6Q3fDYTdStaC-zQwXgMctfGpIsUpp91BtRBPMynFCxZ8fZB7NvGFNZTYWDvCZjisiwzs0N1pDdDM_Fkj3i46_Ou105z348PLHRA28Dt1qgn_NjzwRNoaowFx7PxQ-X2zRpAhwNcqaTOHYh5NYZHToVE16WiOe9HzVs_I_3Wqu44bypEsGrhxYhgXSGfvO757iTbErZHmkidsBF2BET5j3JeIifr4fJooalAKc_5uiSPMCGSTtV9hIQX5mQWJudg9UsMRp1AWVrnBoMQPAhy1UwBDtAOrBs.ts' for reading
Input #0, hls,applehttp, from 'https://video-weaver.yto01.hls.ttvnw.net/v1/playlist/CvADco9ZO_szpL7RVLVI3U6zl4IMo2uaUBvZTWAyEOKETN-SxI3m3hLLxpmCfz06rlyCGCPimEbk28kKPSbVYtMThiZFRtLxnrdpLr5DWBQwbpIStPQwMetU4Z04Mkm3nEWplL8hpn69Cmd_eWSdI1yHubK_sRL-n1ml5akAEWWGkS0OgVRQTTsYv4RpkbeWc8wrr3DsDBDfyrxciGSZevnStZOLwg-tNuNu3VNugLigNG1HMsNdxoJGO6wLyO-6FL5EQidOiSw2THSibAvADAWMVOxNX2z39d-nJwbVprbWFnox_lDlh-y88uhjj_MpU6OwkXP9vgrBDEmKjtRbYsIN5N94-8pDFEB3yIYk10vUiuod1yfqztVCqWo5m9r48uINP1CD-Bwgybo6K7Oko-TUjMj43GqAu0mmPtkgPFO69LpQQMifZTn_XbVQ5UUfoCwyl-ljObfRE51aCvZP_dOTsUyqi_JRE8h-C3306aW1ISXwCs3YpnjDxJv6yKyWTktBvsN5NWMVzJg-_-MAtTmoy-w2ppbbOozLzyrGF4zfCetaHLmHtbsKe1Ed1nndJg9b6T7v-87ExrI0eQwRjH3gmBTgqu_peS5oQGBaDOe4QSGMNFgf8lQfuqvFH-miXgpk8RytdorzT7wB05iX7c3bhBIQ3FvvjNIal3IgvyxKatZs4BoMW_P_CuyZOUJs2_Yr.m3u8':
 Duration: N/A, start: 60.000000, bitrate: N/A
 Program 0 
 Metadata:
 variant_bitrate : 0
 Stream #0:0: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp
 Metadata:
 variant_bitrate : 0
 Stream #0:1: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, unknown/bt709/unknown), 1920x1080, 29.97 tbr, 90k tbn, 2k tbc
 Metadata:
 variant_bitrate : 0
 Stream #0:2: Data: timed_id3 (ID3 / 0x20334449)
 Metadata:
 variant_bitrate : 0
Stream mapping:
 Stream #0:1 -> #0:0 (h264 (native) -> mjpeg (native))
Press [q] to stop, [?] for help
[swscaler @ 0x557213e262c0] deprecated pixel format used, make sure you did set range correctly
Output #0, image2, to '/output_%09d.jpg':
 Metadata:
 encoder : Lavf58.20.100
 Stream #0:0: Video: mjpeg, yuvj420p(pc), 1920x1080, q=2-31, 200 kb/s, 0.50 fps, 0.50 tbn, 0.50 tbc
 Metadata:
 variant_bitrate : 0
 encoder : Lavc58.35.100 mjpeg
 Side data:
 cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
[image2 @ 0x557213012040] Could not open file : /output_000000001.jpg
av_interleaved_write_frame(): Input/output error
frame= 1 fps=0.0 q=7.5 Lsize=N/A time=00:00:02.00 bitrate=N/A speed=27.7x 
video:46kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Conversion failed!



-
Finding a minimal configuration for ffmpeg
28 novembre 2022, par Clemens3000i am currently developing a video player for Windows and Mac using JUCE and FFmpeg. For this i want to include FFmpeg as a shared library and compile it myself in a minimal configuration to get rid of features and dependencies i don't need. This turns out to be quite difficult, since FFmpeg has a HUGE load of dependencies. And i am pretty new to this compiling game.


Of course i checked all the options for configuration, but there is so many and don't have much knowledge about what all the options actually do. Some are obvious, but many are not.


The minimal configuration i am looking for should enable to playback videofiles encoded with h.264 and it should be LGPL compliant. So just decoding, no encoding.


What i did :


- 

- i installed some of the dependencies i might need via macports (under /opt/local)
- i downloaded ffmpeg source code, played around with the configure options and compiled it
- i managed to build my app and it even runs
- i created a configuration with "—disable_everything" and then tried to add features one after another until i build something that works. But that's like finding a needle in the haystack.










For Mac my first attempt for this is :

./configure --disable-everything --prefix='../../osx_arm' --install-name-dir='@executable_path/../libs' --extra-ldflags=-Wl,-rpath,'@executable_path/../libs' --enable-version3 --enable-shared --disable-static --enable-swscale --enable-avfilter --enable-libfdk-aac --enable-audiotoolbox --enable-videotoolbox --enable-pthreads --cc=/usr/bin/clang --extra-ldflags=-L/opt/local/lib


I can compile and link my program and as i expected I cannot do much more, which is totally fine for now.


My questions are now :


- 

-
How can i find out which configure options are essential to enable simple playback ? How do i find out which options can be discarded ?


-
If i run otool on the resulting libs in my current minimal build i still get some dependencies :








otool -L ../../osx_arm/lib/libavcodec.59.37.100.dylib ../../osx_arm/lib/libavcodec.59.37.100.dylib: @executable_path/../libs/libavcodec.59.dylib (compatibility version 59.0.0, current version 59.37.100) @executable_path/../libs/libavutil.57.dylib (compatibility version 57.0.0, current version 57.28.100) /opt/local/lib/libiconv.2.dylib (compatibility version 9.0.0, current version 9.1.0) /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1292.100.5) /System/Library/Frameworks/VideoToolbox.framework/Versions/A/VideoToolbox (compatibility version 1.0.0, current version 1.0.0) /opt/local/lib/libX11.6.dylib (compatibility version 11.0.0, current version 11.0.0) /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation (compatibility version 150.0.0, current version 1775.118.101) /System/Library/Frameworks/CoreMedia.framework/Versions/A/CoreMedia (compatibility version 1.0.0, current version 1.0.0) /System/Library/Frameworks/CoreVideo.framework/Versions/A/CoreVideo (compatibility version 1.2.0, current version 1.5.0) /System/Library/Frameworks/CoreServices.framework/Versions/A/CoreServices (compatibility version 1.0.0, current version 1122.33.0)


Why does FFmpeg actually need libiconv or libX11 ? I believe those don't have to do much with video/audio, right ? Well, I guess FFmpeg needs them anyway...So do i need to compile them myself to and add them to my Application ? I guess later i'll have even more dependencies.


- 

- Any other tips on how to accomplish what i want ?