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Médias (91)
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GetID3 - Boutons supplémentaires
9 avril 2013, par
Mis à jour : Avril 2013
Langue : français
Type : Image
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Core Media Video
4 avril 2013, par
Mis à jour : Juin 2013
Langue : français
Type : Video
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The pirate bay depuis la Belgique
1er avril 2013, par
Mis à jour : Avril 2013
Langue : français
Type : Image
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Bug de détection d’ogg
22 mars 2013, par
Mis à jour : Avril 2013
Langue : français
Type : Video
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Exemple de boutons d’action pour une collection collaborative
27 février 2013, par
Mis à jour : Mars 2013
Langue : français
Type : Image
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Exemple de boutons d’action pour une collection personnelle
27 février 2013, par
Mis à jour : Février 2013
Langue : English
Type : Image
Autres articles (103)
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Websites made with MediaSPIP
2 mai 2011, parThis page lists some websites based on MediaSPIP.
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Use, discuss, criticize
13 avril 2011, parTalk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
A discussion list is available for all exchanges between users. -
Le plugin : Podcasts.
14 juillet 2010, parLe problème du podcasting est à nouveau un problème révélateur de la normalisation des transports de données sur Internet.
Deux formats intéressants existent : Celui développé par Apple, très axé sur l’utilisation d’iTunes dont la SPEC est ici ; Le format "Media RSS Module" qui est plus "libre" notamment soutenu par Yahoo et le logiciel Miro ;
Types de fichiers supportés dans les flux
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Sur d’autres sites (6894)
-
RAW audio capture from HDMI using DeckLink Mini Recorder 4K
12 mars 2020, par Amir RazaI need to capture audio from TI DSP hardware/Laptop. So I opted "DeckLink Mini Recorder 4K Audio" and it connected to desktop.
By using Decklink API’s I am able to capture audio (PCM) with 32-bit depth. But when I used media express to capture, and extracted audio
using FFmpeg and I am getting audio (PCM) with 24-bit depth.Question
1) Does this device "DeckLink Mini Recorder 4K Audio" converts audio from 32-bit to 24-bit ?
2) Is this device "DeckLink Mini Recorder 4K Audio" bit-exact/loss-less ?consider the below test scenario.
I am playing audio(PCM) by MPC-HC/VLC/Groove player in laptop and capture audio(PCM) using "DeckLink Mini Recorder 4K Audio"
connected to desktop, The capture audio is bit-exact with the streamed input.?i.e ffmpeg.exe -i HDMI_Output1.av1 -vn -c:a copy out.wav
Note :
i am using Blackmagic_Desktop_Video_Windows_11.5 & Blackmagic_DeckLink_SDK_11.5 softwares.I have added the Decklink API code snippet.
void main()
{
IDeckLinkIterator* deckLinkIterator = NULL;
IDeckLinkAttributes* deckLinkAttributes = NULL;
IDeckLink* deckLink = NULL;
IDeckLinkInput* deckLinkInput = NULL;
NotificationCallback* notificationCallback = NULL;
HRESULT result;
BOOL supported;
int returnCode = 1;
#ifdef WRITE_WAV_FILE
wave_header wh;
unsigned octet_depth;
#endif
Initialize();
#ifdef _WIN32
MutexHandle = CreateMutex(NULL, /* security attributes */
FALSE, /* initially not owned */
NULL); /* Name */
#endif
/* Create an IDeckLinkIterator object to enumerate all DeckLink cards in the system */
if (GetDeckLinkIterator(&deckLinkIterator) != S_OK)
{
fprintf(stderr, "A DeckLink iterator could not be created. The DeckLink drivers may not be installed.\n");
goto bail;
}
/* Obtain the first DeckLink device */
result = deckLinkIterator->Next(&deckLink);
if (result != S_OK)
{
fprintf(stderr, "Could not find DeckLink device - result = %08x\n", result);
goto bail;
}
/* Obtain the Attributes interface for the DeckLink device */
result = deckLink->QueryInterface(IID_IDeckLinkAttributes, (void**)&deckLinkAttributes);
if (result != S_OK)
{
fprintf(stderr, "Could not obtain the IDeckLinkAttributes interface - result = %08x\n", result);
goto bail;
}
/* Determine whether the DeckLink device supports input format detection */
result = deckLinkAttributes->GetFlag(BMDDeckLinkSupportsInputFormatDetection, &supported);
if ((result != S_OK) || (supported == false))
{
fprintf(stderr, "Device does not support automatic mode detection\n");
goto bail;
}
/* Obtain the input interface for the DeckLink device */
result = deckLink->QueryInterface(IID_IDeckLinkInput, (void**)&deckLinkInput);
if (result != S_OK)
{
fprintf(stderr, "Could not obtain the IDeckLinkInput interface - result = %08x\n", result);
goto bail;
}
/* Create an instance of notification callback */
notificationCallback = new NotificationCallback(deckLinkInput);
if (notificationCallback == NULL)
{
fprintf(stderr, "Could not create notification callback object\n");
goto bail;
}
/* Set the callback object to the DeckLink device's input interface */
result = deckLinkInput->SetCallback(notificationCallback);
if (result != S_OK)
{
fprintf(stderr, "Could not set callback - result = %08x\n", result);
goto bail;
}
/* Enable video input with a default video mode and the automatic format detection feature enabled */
result = deckLinkInput->EnableVideoInput(bmdModeHD1080p5994, bmdFormat8BitYUV, bmdVideoInputFlagDefault);
if (result != S_OK)
{
fprintf(stderr, "Could not enable video input - result = %08x\n", result);
goto bail;
}
nBytesPerSample = (bmdAudioSampleType32bitInteger >> 3);
nChannels = 2;
/* Enable audio input with a default audio mode and the automatic format detection feature enabled */
result = deckLinkInput->EnableAudioInput(bmdAudioSampleRate48kHz, bmdAudioSampleType32bitInteger, nChannels);
if (result != S_OK)
{
fprintf(stderr, "Could not enable audio input - result = %08x\n", result);
goto bail;
}
#ifdef WRITE_WAV_FILE
/* Populate the wave headers */
/* RIFF */
sprintf(&wh.riff.name1[0], "RIFF");
sprintf(&wh.riff.name2[0], "WAVE");
/* format */
octet_depth = (bmdAudioSampleType32bitInteger + 7) / 8;
sprintf(&wh.fmt.name[0], "fmt ");
wh.fmt.size = FMT_SIZE;
wh.fmt.format_type = FMT_TAG_PCM;
wh.fmt.channel_count = (unsigned short)nChannels;
wh.fmt.sample_rate = bmdAudioSampleRate48kHz;
wh.fmt.bits_per_sample = (unsigned short)octet_depth * 8;
wh.fmt.block_alignment = (unsigned short)(octet_depth*nChannels);
wh.fmt.bytes_per_second = (unsigned long)wh.fmt.block_alignment*bmdAudioSampleRate48kHz;
wh.fmt.extra_bytes = (unsigned short)0;
/* data */
sprintf(&wh.data.name[0], "data");
#endif
printf("Starting streams\n");
/* Start capture */
result = deckLinkInput->StartStreams();
if (result != S_OK)
{
fprintf(stderr, "Could not start capture - result = %08x\n", result);
goto bail;
}
#ifdef WRITE_WAV_FILE
FILE *fp = fopen("HDMI_Output.wav", "wb");
#else
FILE *fp = fopen("HDMI_Output.bin","wb");
#endif
char *ptrCopy;
float *fPtr;
unsigned int zeroCntr, trailingZerosCnt;
do
{
zeroCntr = 0;
trailingZerosCnt = 0;
#ifdef _WIN32
WaitForSingleObject(MutexHandle, /* handle */
INFINITE); /* time-out interval */
#endif
int bytesInQueue = (int)((long long)aBufPtr - (long long)aBufWritePtr);
ptrCopy = (char *)aBufPtr;
#ifdef _WIN32
ReleaseMutex(MutexHandle);
#endif
if (bytesInQueue > 0)
{
#ifdef STRIP_ZEROS
/* Parse data for zeros */
fPtr = (float *)aBufWritePtr;
for (int i = 0; i < (bytesInQueue >> 2); i++)
{
if (*(fPtr + i) == 0.0)
zeroCntr++;
else
break;
}
aBufWritePtr += (zeroCntr << 2);
bytesInQueue -= (zeroCntr << 2);
#endif
if (bytesInQueue > 0)
{
fPtr = (float *)aBufWritePtr;
for (int i = 0; i < (bytesInQueue >> 2); i++)
{
fwrite(fPtr, 4, 1, fp);
fflush(fp);
if (*fPtr == 0.0)
trailingZerosCnt++;
else
trailingZerosCnt = 0;
if (trailingZerosCnt >= NUM_TRAIL_ZEROS_TRESHOLD)
break;
fPtr++;
}
}
}
aBufWritePtr = ptrCopy;
Sleep(100);
} while (trailingZerosCnt < NUM_TRAIL_ZEROS_TRESHOLD);
fclose (fp);
#ifdef STRIP_ZEROS
/* Remove trailing zeros, write wave header */
#ifdef WRITE_WAV_FILE
fp = fopen("HDMI_Output.wav", "rb");
#else
fp = fopen("HDMI_Output.bin", "rb");
#endif
fseek(fp, 0, SEEK_END);
int size = ftell(fp);
size = size - (NUM_TRAIL_ZEROS_TRESHOLD << 2);
printf(" \n size of hearder = %d", size);
#ifdef WRITE_WAV_FILE
wh.data.size = size;
wh.riff.size = wh.data.size + sizeof(wave_format) + sizeof(wave_RIFF);
printf(" \n size of hearderwh.riff.size = %d", wh.riff.size);
#endif
char * tmpBuf = (char *)malloc(size);
fseek(fp, 0, SEEK_SET);
fread(tmpBuf, 1, size, fp);
fclose(fp);
#endif
#ifdef WRITE_WAV_FILE
fp = fopen("HDMI_Output.wav", "wb");
/* write the wave header */
fwrite(&wh, 1, sizeof(wave_header), fp);
/* Write the zero stripped PCM data */
fwrite(tmpBuf, 1, size, fp);
free(tmpBuf);
fflush(fp);
fclose(fp);
#endif
bail:
/* Stop capture */
result = deckLinkInput->StopStreams();
/* Disable the video input interface */
result = deckLinkInput->DisableVideoInput();
/* return success */
returnCode = 0;
/* Release resources */
/* Release the attributes interface */
if (deckLinkAttributes != NULL)
deckLinkAttributes->Release();
/* Release the video input interface */
if (deckLinkInput != NULL)
deckLinkInput->Release();
/* Release the Decklink object */
if (deckLink != NULL)
deckLink->Release();
/* Release the DeckLink iterator */
if (deckLinkIterator != NULL)
deckLinkIterator->Release();
/* Release the notification callback object */
if (notificationCallback)
delete notificationCallback;
} -
How can i create a portrait video using Android's MediaRecorder
23 mars 2015, par urudroidI have an Android application which is able to record and play a videos in portrait mode, those features are working fine on Android phones.
The issue comes up because this video is needed to be played also on iOS devices (after being shared through a server).
iOS is not correctly showing the video as it looks "cropped", but videos recorded on iOS are played without issues.
So, the main difference between videos created on Android and iOS’ is the size and the rotation.
Im using CWAC-Camera library for preview and recording and ffmpeg to scale the video down to 320x568px (as this is the standard size for both Android and iOS apps).
Here is the metadata from an video created from Android :
General
Complete name : android_video.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom
File size : 447 KiB
Duration : 5s 596ms
Overall bit rate : 654 Kbps
Encoded date : UTC 1904-01-01 00:00:00
Tagged date : UTC 1904-01-01 00:00:00
Writing application : Lavf56.4.101
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L2.1
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 5s 406ms
Bit rate : 536 Kbps
Width : 568 pixels
Height : 320 pixels
Display aspect ratio : 16:9
Original display aspect ratio : 16:9
Rotation : 270°
Frame rate mode : Constant
Frame rate : 14.985 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.197
Stream size : 354 KiB (79%)
Writing library : x264 core 142
Encoding settings : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=6 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=14 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=23.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Language : English
Encoded date : UTC 1904-01-01 00:00:00
Tagged date : UTC 1904-01-01 00:00:00
Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 5s 596ms
Bit rate mode : Constant
Bit rate : 132 Kbps
Channel(s) : 2 channels
Channel(s)_Original : 1 channel
Channel positions : Front: C
Sampling rate : 44.1 KHz
Compression mode : Lossy
Stream size : 89.4 KiB (20%)
Language : English
Encoded date : UTC 1904-01-01 00:00:00
Tagged date : UTC 1904-01-01 00:00:00And here is the metadata from the video created on iOS :
General
Complete name : ios_video.mp4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42
File size : 673 KiB
Duration : 7s 38ms
Overall bit rate : 783 Kbps
Encoded date : UTC 2015-03-17 19:16:36
Tagged date : UTC 2015-03-17 19:16:37
Video
ID : 2
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L3.0
Format settings, CABAC : Yes
Format settings, ReFrames : 2 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 7s 33ms
Bit rate : 711 Kbps
Width : 320 pixels
Height : 568 pixels
Display aspect ratio : 0.563
Frame rate mode : Constant
Frame rate : 30.000 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.130
Stream size : 610 KiB (91%)
Title : Core Media Video
Encoded date : UTC 2015-03-17 19:16:36
Tagged date : UTC 2015-03-17 19:16:37
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
Color range : Limited
Audio
ID : 1
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 7s 38ms
Source duration : 7s 105ms
Bit rate mode : Constant
Bit rate : 64.0 Kbps
Channel(s) : 2 channels
Channel(s)_Original : 1 channel
Channel positions : Front: C
Sampling rate : 44.1 KHz
Compression mode : Lossy
Stream size : 56.8 KiB (8%)
Source stream size : 57.2 KiB (9%)
Title : Core Media Audio
Encoded date : UTC 2015-03-17 19:16:36
Tagged date : UTC 2015-03-17 19:16:37The values width and height are inverted on Android, also the Rotation parameter is set to 270º (this is the rotation parameter for portrait videos).
This is a sketch of how iOS’ videos look on iOS app :
And this is how Android’s videos look on iOS app :
So, in order to get the videos correctly displayed both on iOS and Android i need to be able to set the width to 320 and height to 568 on Android. I tried it from several places (outside and inside CWAC-Camera library) but i always get a Camera.Parameters error.
It is possible to do this on Android ?
EDIT :
This is the result i get when i set the rotation to 0 with ffmpeg :
-
FFmpeg : Invalid buffer size when streaming to Twitch
1er décembre 2020, par user1965074I am streaming a 2560x1440 @ 24FPS to Twitch with this command :


ffmpeg \
> -f rawvideo \
> -vcodec rawvideo \
> -s 2560x1440 \
> -pix_fmt bgr24 \
> -r "24" \
> -i 20200818-074700.mp4 \
> -f flv \
> -vcodec libx264 \
> -profile:v main \
> -g 48 \
> -keyint_min 24 \
> -b:v 4500k \
> -minrate 4500k \
> -maxrate 4500k \
> -pix_fmt yuv420p \
> -preset ultrafast \
> -tune zerolatency \
> -threads 0 \
> -bufsize 4500k \
> rtmp://live-arn.twitch.tv/app/{KEY}


It fails with message
Invalid buffer size, packet size 9137374 < expected frame_size 11059200. Given the error message, I have tried decreasing and increasing the4500kin all places of the command as explained in this answer but it does not help.

Here is the full log


ffmpeg version 2.8.17-0ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
 built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.12) 20160609
 configuration: --prefix=/usr --extra-version=0ubuntu0.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
 libavutil 54. 31.100 / 54. 31.100
 libavcodec 56. 60.100 / 56. 60.100
 libavformat 56. 40.101 / 56. 40.101
 libavdevice 56. 4.100 / 56. 4.100
 libavfilter 5. 40.101 / 5. 40.101
 libavresample 2. 1. 0 / 2. 1. 0
 libswscale 3. 1.101 / 3. 1.101
 libswresample 1. 2.101 / 1. 2.101
 libpostproc 53. 3.100 / 53. 3.100
[rawvideo @ 0xfb3120] Estimating duration from bitrate, this may be inaccurate
Input #0, rawvideo, from '20200818-074700.mp4':
 Duration: 00:00:02.96, start: 0.000000, bitrate: 2118169 kb/s
 Stream #0:0: Video: rawvideo (BGR[24] / 0x18524742), bgr24, 2560x1440, 2123366 kb/s, 24 tbr, 24 tbn, 24 tbc
[libx264 @ 0xfbdfc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
[libx264 @ 0xfbdfc0] profile Constrained Baseline, level 5.0
[libx264 @ 0xfbdfc0] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - 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=0 threads=22 lookahead_threads=16 sliced_threads=1 slices=22 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=48 keyint_min=24 scenecut=0 intra_refresh=0 rc_lookahead=0 rc=cbr mbtree=0 bitrate=4500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=4500 vbv_bufsize=4500 nal_hrd=none filler=0 ip_ratio=1.40 aq=0
Output #0, flv, to 'rtmp://live-arn.twitch.tv/app/{KEY}':
 Metadata:
 encoder : Lavf56.40.101
 Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p, 2560x1440, q=-1--1, 4500 kb/s, 24 fps, 1k tbn, 24 tbc
 Metadata:
 encoder : Lavc56.60.100 libx264
Stream mapping:
 Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0xfbdfc0] VBV underflow (frame 0, -1827312 bits)
Truncating packet of size 11059200 to 9137375me=00:00:02.33 bitrate=6051.7kbits/s 
[rawvideo @ 0xfbca80] Invalid buffer size, packet size 9137374 < expected frame_size 11059200
Error while decoding stream #0:0: Invalid argument
[flv @ 0xfbd020] Failed to update header with correct duration.
[flv @ 0xfbd020] Failed to update header with correct filesize.
frame= 70 fps= 54 q=52.0 Lsize= 2029kB time=00:00:02.91 bitrate=5698.4kbits/s 
video:2026kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.152412%
[libx264 @ 0xfbdfc0] frame I:2 Avg QP:47.09 size:381468
[libx264 @ 0xfbdfc0] frame P:68 Avg QP:51.00 size: 19279
[libx264 @ 0xfbdfc0] mb I I16..4: 100.0% 0.0% 0.0%
[libx264 @ 0xfbdfc0] mb P I16..4: 14.1% 0.0% 0.0% P16..4: 2.7% 0.0% 0.0% 0.0% 0.0% skip:83.2%
[libx264 @ 0xfbdfc0] coded y,uvDC,uvAC intra: 8.2% 94.6% 83.0% inter: 0.0% 3.2% 0.7%
[libx264 @ 0xfbdfc0] i16 v,h,dc,p: 87% 1% 12% 0%
[libx264 @ 0xfbdfc0] i8c dc,h,v,p: 98% 1% 2% 0%
[libx264 @ 0xfbdfc0] kb/s:5688.52


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