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  • Gestion générale des documents

    13 mai 2011, par

    MédiaSPIP ne modifie jamais le document original mis en ligne.
    Pour chaque document mis en ligne il effectue deux opérations successives : la création d’une version supplémentaire qui peut être facilement consultée en ligne tout en laissant l’original téléchargeable dans le cas où le document original ne peut être lu dans un navigateur Internet ; la récupération des métadonnées du document original pour illustrer textuellement le fichier ;
    Les tableaux ci-dessous expliquent ce que peut faire MédiaSPIP (...)

  • Liste des distributions compatibles

    26 avril 2011, par

    Le tableau ci-dessous correspond à la liste des distributions Linux compatible avec le script d’installation automatique de MediaSPIP. Nom de la distributionNom de la versionNuméro de version Debian Squeeze 6.x.x Debian Weezy 7.x.x Debian Jessie 8.x.x Ubuntu The Precise Pangolin 12.04 LTS Ubuntu The Trusty Tahr 14.04
    Si vous souhaitez nous aider à améliorer cette liste, vous pouvez nous fournir un accès à une machine dont la distribution n’est pas citée ci-dessus ou nous envoyer le (...)

  • Encoding and processing into web-friendly formats

    13 avril 2011, par

    MediaSPIP automatically converts uploaded files to internet-compatible formats.
    Video files are encoded in MP4, Ogv and WebM (supported by HTML5) and MP4 (supported by Flash).
    Audio files are encoded in MP3 and Ogg (supported by HTML5) and MP3 (supported by Flash).
    Where possible, text is analyzed in order to retrieve the data needed for search engine detection, and then exported as a series of image files.
    All uploaded files are stored online in their original format, so you can (...)

Sur d’autres sites (7726)

  • No sound when capture screen

    10 janvier 2018, par scrapy

    To capture my pc screen with following ffmpeg command.

    ffmpeg -f pulse -ac 2 -i default -f x11grab -r 30 -s 1920x1080 -i :0.0 -acodec pcm_s16le -vcodec libx264 -preset ultrafast -threads 0 -y /tmp/output.mkv

    The output displayed on my console when to execute the above command.

    Guessed Channel Layout for Input Stream #0.0 : stereo
    
Input #0, pulse, from 'default':
    
  Duration: N/A, start: 1515543051.106987, bitrate: 1536 kb/s
    
    Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
    
[x11grab @ 0x564bda5b8520] Stream #0: not enough frames to estimate rate; consider increasing probesize
    
Input #1, x11grab, from ':0.0':
    
  Duration: N/A, start: 1515543052.415508, bitrate: N/A
    
    Stream #1:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1920x1080, 30 fps, 1000k tbr, 1000k tbn, 1000k tbc
    
No pixel format specified, yuv444p for H.264 encoding chosen.
    
Use -pix_fmt yuv420p for compatibility with outdated media players.
    
[libx264 @ 0x564bda5c1560] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 LZCNT
    
[libx264 @ 0x564bda5c1560] profile High 4:4:4 Predictive, level 4.0, 4:4:4 8-bit
    
[libx264 @ 0x564bda5c1560] 264 - core 148 r2748 97eaef2 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=6 threads=3 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
    
Output #0, matroska, to '/tmp/output.mkv':
    
  Metadata:
    
    encoder         : Lavf57.56.101
    
    Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv444p, 1920x1080, q=-1--1, 30 fps, 1k tbn, 30 tbc
    
    Metadata:
    
      encoder         : Lavc57.64.101 libx264
    
    Side data:
    
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    
    Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s16, 1536 kb/s
    
    Metadata:
    
      encoder         : Lavc57.64.101 pcm_s16le
    
Stream mapping:
    
  Stream #1:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
    
  Stream #0:0 -> #0:1 (pcm_s16le (native) -> pcm_s16le (native))

    Playing a music when to make the screenshot,i can hear the music playing lound.
    It’s strange that vedio came out perfectly without sound when to play the captured /tmp/output.mkv.

    Open my volume control with pavucontrol.

    Nothing in recording window, maybe the blank recording window result in no souond when to capture screen !
    How to fix it ?

    enter image description here

    enter image description here

    enter image description here

    enter image description here

    enter image description here

  • C# discord bot no sound using ffmpeg

    23 mars 2018, par Tao Sun

    I’m trying to implement a music bot using C# for discord. The code is currently hanging at

    await output.CopyToAsync(discord);

    with no sound in voice channel. Here’s the code :

    public async Task SendAudioAsync(IGuild guild, IMessageChannel channel, string path)
    
        {
    
            var ffmpeg = CreateStream(path);
    
            var output = ffmpeg.StandardOutput.BaseStream;
    

    

    
            if (audioClient!=null)
    
            {
    

    
                Console.WriteLine("get channel!" + audioClient.ToString());
    

    
                var discord = audioClient.CreatePCMStream(AudioApplication.Voice);
    
                Console.WriteLine("before copying");
    
                await output.CopyToAsync(discord);
    
                Console.WriteLine("finished copying");
    
                await discord.FlushAsync();
    
                Console.WriteLine("finished");
    
            }
    
        }
    

    

    
        private Process CreateStream(string path)
    
        {
    
            return Process.Start(new ProcessStartInfo
    
            {
    
                FileName = "E:\\discord_projects\\yikkuro_s_slave\\bot\\yikkuro_s_slave_bot\\ffmpeg\\bin\\ffmpeg.exe",
    
                 Arguments = $"-i {path} -ac 2 -f s16le -ar 48000 pipe:1",
    
                UseShellExecute = false,
    
                RedirectStandardOutput = true
    
            });
    
        }

    I think its kinda doing the job with console output :
    enter image description here

    But there is no sound in discord.

  • mp4 plays only sound but no video on ios

    5 avril 2018, par Chen

    I have a video that I get from a third party provide in my App, I want to play using react-native-video. It works fine on simulator, but on a real iphone 7 it has only sound but no video.

    After further research I found, when I try to airdrop/move via itunes the video to my iphone. It shows something like the following :

    enter image description here

    I have checked the codec with ffprobe and here is the output.
    ```

    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'bad.mp4':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: mp42mp41
    
    creation_time   : 2018-03-28T21:30:13.000000Z
    
  Duration: 00:00:45.55, start: 0.000000, bitrate: 1373 kb/s
    
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 1042 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    
    Metadata:
    
      creation_time   : 2018-03-28T21:30:13.000000Z
    
      handler_name    : Alias Data Handler
    
      encoder         : AVC Coding
    
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
    
    Metadata:
    
      creation_time   : 2018-03-28T21:30:13.000000Z
    
      handler_name    : Alias Data Handler
    
[STREAM]
    
index=0
    
codec_name=h264
    
codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
    
profile=High
    
codec_type=video
    
codec_time_base=1001/60000
    
codec_tag_string=avc1
    
codec_tag=0x31637661
    
width=1920
    
height=1080
    
coded_width=1920
    
coded_height=1080
    
has_b_frames=1
    
sample_aspect_ratio=1:1
    
display_aspect_ratio=16:9
    
pix_fmt=yuv420p
    
level=41
    
color_range=tv
    
color_space=bt709
    
color_transfer=bt709
    
color_primaries=bt709
    
chroma_location=left
    
field_order=unknown
    
timecode=N/A
    
refs=1
    
is_avc=true
    
nal_length_size=4
    
id=N/A
    
r_frame_rate=30000/1001
    
avg_frame_rate=30000/1001
    
time_base=1/30000
    
start_pts=0
    
start_time=0.000000
    
duration_ts=1365364
    
duration=45.512133
    
bit_rate=1042237
    
max_bit_rate=N/A
    
bits_per_raw_sample=8
    
nb_frames=1364
    
nb_read_frames=N/A
    
nb_read_packets=N/A
    
DISPOSITION:default=1
    
DISPOSITION:dub=0
    
DISPOSITION:original=0
    
DISPOSITION:comment=0
    
DISPOSITION:lyrics=0
    
DISPOSITION:karaoke=0
    
DISPOSITION:forced=0
    
DISPOSITION:hearing_impaired=0
    
DISPOSITION:visual_impaired=0
    
DISPOSITION:clean_effects=0
    
DISPOSITION:attached_pic=0
    
DISPOSITION:timed_thumbnails=0
    
TAG:creation_time=2018-03-28T21:30:13.000000Z
    
TAG:language=eng
    
TAG:handler_name=Alias Data Handler
    
TAG:encoder=AVC Coding
    
[/STREAM]
    
[STREAM]
    
index=1
    
codec_name=aac
    
codec_long_name=AAC (Advanced Audio Coding)
    
profile=LC
    
codec_type=audio
    
codec_time_base=1/48000
    
codec_tag_string=mp4a
    
codec_tag=0x6134706d
    
sample_fmt=fltp
    
sample_rate=48000
    
channels=2
    
channel_layout=stereo
    
bits_per_sample=0
    
id=N/A
    
r_frame_rate=0/0
    
avg_frame_rate=0/0
    
time_base=1/48000
    
start_pts=0
    
start_time=0.000000
    
duration_ts=2184582
    
duration=45.512125
    
bit_rate=317375
    
max_bit_rate=458625
    
bits_per_raw_sample=N/A
    
nb_frames=2135
    
nb_read_frames=N/A
    
nb_read_packets=N/A
    
DISPOSITION:default=1
    
DISPOSITION:dub=0
    
DISPOSITION:original=0
    
DISPOSITION:comment=0
    
DISPOSITION:lyrics=0
    
DISPOSITION:karaoke=0
    
DISPOSITION:forced=0
    
DISPOSITION:hearing_impaired=0
    
DISPOSITION:visual_impaired=0
    
DISPOSITION:clean_effects=0
    
DISPOSITION:attached_pic=0
    
DISPOSITION:timed_thumbnails=0
    
TAG:creation_time=2018-03-28T21:30:13.000000Z
    
TAG:language=eng
    
TAG:handler_name=Alias Data Handler
    
[/STREAM]

    Then I tried VLC on iOS the video played without problem (it has both video and sound), except at the beginning it shows a grey pixel screen.

    enter image description here

    Next, what i did was using ffmpeg to re-encode the video stream via :

    ffmpeg -i bad.mp4 -c:a copy new.mp4

    After this new.mp4 plays with no problem.
    This is really confusing as the codec does not change and both videos works with no problem on my Mac.

    I have tried to play around with the b_frames, profile level on the new video to reproduce the problem but with no luck.

    I really do not want to process every video via ffmpeg after get it from the third party. Just wondering what might be the problem with the video ?

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