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Autres articles (45)
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Mise à jour de la version 0.1 vers 0.2
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Au niveau des dépendances logicielles Utilisation des dernières versions de FFMpeg (>= v1.2.1) ; Installation des dépendances pour Smush ; Installation de MediaInfo et FFprobe pour la récupération des métadonnées ; On n’utilise plus ffmpeg2theora ; On n’installe plus flvtool2 au profit de flvtool++ ; On n’installe plus ffmpeg-php qui n’est plus maintenu au (...) -
Personnaliser en ajoutant son logo, sa bannière ou son image de fond
5 septembre 2013, parCertains thèmes prennent en compte trois éléments de personnalisation : l’ajout d’un logo ; l’ajout d’une bannière l’ajout d’une image de fond ;
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Soumettre améliorations et plugins supplémentaires
10 avril 2011Si vous avez développé une nouvelle extension permettant d’ajouter une ou plusieurs fonctionnalités utiles à MediaSPIP, faites le nous savoir et son intégration dans la distribution officielle sera envisagée.
Vous pouvez utiliser la liste de discussion de développement afin de le faire savoir ou demander de l’aide quant à la réalisation de ce plugin. MediaSPIP étant basé sur SPIP, il est également possible d’utiliser le liste de discussion SPIP-zone de SPIP pour (...)
Sur d’autres sites (9117)
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C++ RTSP Stream recording timebase wrong ffmpeg
29 juillet 2021, par Tom BairesWe fetch a camera stream over RTSP (Axis Q1755 H264). And after a random time we a start recording the stream to a file. I check the video file with ffprobe and realise the start time is not the start time of the recording it is the start time of fetch the stream. My Video has a length of 5 seconds and the start time of the video should be 0. But the real starttime of the Video is at second 20. This leads to a an incorrect timebase. (ffmpeg Version 3.3.3)


I try to repair it, but now i have some time the error
timebase 1/180000...i marked my changes with the comment(timebase repair logic)



ffprobe Output (without timebase repair logic)
The start is higher as the duration, correctly the start is
0and not20.080000

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
'C:\testvideo.mp4': 
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf57.71.100 Duration: 00:00:05.04, start: 20.080000, bitrate: 2675 kb/s
 Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuvj420p(pc, bt709), 800x450 [SAR 1:1 DAR 16:9], 2670 kb/s, 50.20 fps,
 50 tbr, 180k tbn, 360k tbc (default)
 Metadata:
 handler_name : VideoHandler


Error after the add of timebase repair logic




[mpeg4 @ 00000178fcb12b40] timebase 1/180000 not supported by MPEG 4
standard, the maximum admitted value for the timebase denominator is
65535 Could not open codec 'mpeg4' : Unspecified error Cannot start
recording




Here some parts of my code


Start Logic


bool RecordingStreamGrabber::start()
{
 CORE_LOG_INFO(m_logger, "Started RecordingStreamGrabber");
 if (m_thread == NULL)
 {
 if (this->prepareInputStream())
 {
 m_run = true;
 m_thread = new std::thread(RecordingStreamGrabber::run, this);
 return true;
 }
 CORE_LOG_ERROR(m_logger, "Error starting RecrodingStreamGrabber");
 return false;
 }
 return false;
}


Prepare Input/Output Stream


bool RecordingStreamGrabber::prepareInputStream()
{
 CORE_LOG_INFO(m_logger, "Preparing Inputstream for recording: " << m_url);

 m_ifmtctx = avformat_alloc_context();
 interrupt_recording_nostop = false;
 interrupt_recording_timeout = m_timeout; // Timeout in milisekunde
 interrupt_recording_starttime = GetTickCount();
 m_ifmtctx->interrupt_callback = interrupt_timeout_cb;

 if (avformat_open_input(&m_ifmtctx, m_url.c_str(), NULL, NULL) != 0)
 {
 m_ifmtctx = NULL;
 CORE_LOG_ERROR(m_logger, "Error opening recording URL: " << m_url);
 return false;
 }

 interrupt_recording_nostop = true;

 if (avformat_find_stream_info(m_ifmtctx, NULL) < 0)
 {
 CORE_LOG_ERROR(m_logger, "Error finding stream in URL: " << m_url);
 avformat_close_input(&m_ifmtctx);
 m_ifmtctx = NULL;
 return false;
 }

 //search for the first video stream
 m_stream_index = -1;
 for (unsigned int i = 0; i < m_ifmtctx->nb_streams && m_stream_index == -1; i++)
 {
 m_iccx = m_ifmtctx->streams[i]->codec;
 if (m_iccx->codec_type == AVMEDIA_TYPE_VIDEO)
 {
 m_istream = m_ifmtctx->streams[i];
 m_stream_index = i;
 }
 }

 if (m_stream_index == -1)
 {
 CORE_LOG_ERROR(m_logger, "Could not find video stream in URL: " << m_url);
 avformat_close_input(&m_ifmtctx);
 m_ifmtctx = NULL;
 return false;
 }

 return true;
}

bool RecordingStreamGrabber::prepareOutputStream()
{
 if (m_ofmtctx)
 {
 CORE_LOG_DEBUG(m_logger, "Close outputfile: " << m_targetfile);
 avformat_free_context(m_ofmtctx);
 m_ofmtctx = NULL;
 }

 m_ofmt = av_guess_format(NULL, m_targetfile.c_str(), NULL);

 m_ofmtctx = avformat_alloc_context();

 m_ofmtctx->oformat = m_ofmt;

 if (avio_open2(&m_ofmtctx->pb, m_targetfile.c_str(), AVIO_FLAG_WRITE, NULL, NULL) != 0)
 {
 avformat_free_context(m_ofmtctx);
 m_ofmtctx = NULL;
 CORE_LOG_ERROR(m_logger, "Error opening outputfile: " << m_targetfile);
 return false;
 }

 m_ostream = avformat_new_stream(m_ofmtctx, NULL);

 avcodec_copy_context(m_ostream->codec, m_iccx);

 m_ostream->sample_aspect_ratio.num = m_iccx->sample_aspect_ratio.num;
 m_ostream->sample_aspect_ratio.den = m_iccx->sample_aspect_ratio.den;

 /* time base: this is the fundamental unit of time (in seconds) in terms
 of which frame timestamps are represented. for fixed-fps content,
 timebase should be 1/framerate and timestamp increments should be
 identically 1. */
 m_ostream->time_base.num = m_iccx->time_base.num;
 m_ostream->time_base.den = m_iccx->time_base.den;

 avformat_write_header(m_ofmtctx, NULL);

#ifdef WIN32
 sprintf_s(m_ofmtctx->filename, sizeof(m_ofmtctx->filename), "%s", m_targetfile.c_str());
#else
 snprintf(m_ofmtctx->filename, sizeof(m_ofmtctx->filename), "%s", m_targetfile.c_str());
#endif
 return true;
}


Recording Logic


void RecordingStreamGrabber::run(RecordingStreamGrabber *_this)
{
 AVPacket packet;
 av_init_packet(&packet);
 int i = 0;
 bool startFrame = true;
 bool keyFrame = false;
 int64_t pts, dts;
 _this->m_tailWritten = true;
 while (_this->m_run)
 {
 if (av_read_frame(_this->m_ifmtctx, &packet) >= 0)
 {
 if ((packet.flags & AV_PKT_FLAG_KEY) == AV_PKT_FLAG_KEY)
 {
 keyFrame = true;
 CORE_LOG_DEBUG(_this->m_logger, "Detected key frame: " << i << "");
 }

 if (_this->m_record)
 {
 if (packet.stream_index == _this->m_stream_index)
 {
 packet.stream_index = _this->m_ostream->id;

 if (_this->m_tailWritten == false || keyFrame == true)
 {
 //#####################################
 //timebase repair logic (my changes)
 //#####################################
 AVStream *in_stream;
 AVStream *out_stream;

 in_stream = _this->m_ifmtctx->streams[packet.stream_index];
 out_stream = _this->m_ofmtctx->streams[packet.stream_index];

 if (startFrame)
 {
 pts = packet.pts;
 dts = packet.dts;
 startFrame = false;
 }
 packet.pts -= pts;
 packet.dts -= dts;

 packet.pts = av_rescale_q_rnd(packet.pts, in_stream->time_base, out_stream->time_base, (AVRounding)((int)AV_ROUND_NEAR_INF | (int)AV_ROUND_PASS_MINMAX));
 packet.dts = av_rescale_q_rnd(packet.dts, in_stream->time_base, out_stream->time_base, (AVRounding)((int)AV_ROUND_NEAR_INF | (int)AV_ROUND_PASS_MINMAX));

 packet.duration = av_rescale_q(packet.duration, in_stream->time_base, out_stream->time_base);
 //end of my changes
 
 av_interleaved_write_frame(_this->m_ofmtctx, &packet);
 _this->m_tailWritten = false;
 }
 }
 }
 else if (_this->m_ofmtctx)
 {
 if (_this->m_tailWritten == false)
 {
 av_write_trailer(_this->m_ofmtctx);
 avio_close(_this->m_ofmtctx->pb);
 }
 avformat_free_context(_this->m_ofmtctx);
 _this->m_tailWritten = true;
 _this->m_ofmtctx = NULL;
 startFrame = true;
 }
 i++;
 keyFrame = false;
 }
 av_free_packet(&packet);
 av_init_packet(&packet);
 }
 if (_this->m_record)
 {
 av_write_trailer(_this->m_ofmtctx);
 avio_close(_this->m_ofmtctx->pb);
 }
 if (_this->m_ofmtctx)
 {
 avformat_free_context(_this->m_ofmtctx);
 _this->m_ofmtctx = NULL;
 }
 _this->m_record = false;

 avformat_close_input(&_this->m_ifmtctx);
 _this->m_ifmtctx = NULL;
}


Other question
How can I check whether my project uses the deprecated api (answer of @berak) ?


-
convert mp4 to m4a using ffmpeg in android
30 novembre 2017, par abdulrahmanI’m trying to add the ability to compress video files in my project. However, I tried to extract the Audio from the original video file using FFMPEG Library before compressing it. The command line was
-i video.mp4 -c:a aac -b:a 160k target.m4aAfter the encoding was done I noticed that the output is still a video file but with a difference in the size. This brought two questions to me and I would like to know their answers.
1 - can the ".m4a" file be considered as a video file ?
2 - can I use this command line to compress video files ?
Best regards
Log after executing the command
<p>
success load
started encoding
ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 4.8 (GCC)
configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
libavutil 55. 17.103 / 55. 17.103
libavcodec 57. 24.102 / 57. 24.102
libavformat 57. 25.100 / 57. 25.100
libavdevice 57. 0.101 / 57. 0.101
libavfilter 6. 31.100 / 6. 31.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/tempVid.mp4':
Metadata:
major_brand : 3gp4
minor_version : 0
compatible_brands: isom3gp4
creation_time : 2017-11-30 03:22:41
com.android.version: 6.0.1
Duration: 00:00:19.80, start: 0.000000, bitrate: 4246 kb/s
Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 176x144, 4112 kb/s, SAR 1:1 DAR 11:9, 29.94 fps, 29.97 tbr, 90k tbn, 180k tbc (default)
Metadata:
rotate : 270
creation_time : 2017-11-30 03:22:41
handler_name : VideoHandle
Side data:
displaymatrix: rotation of 90.00 degrees
Stream #0:1(eng): Audio: amr_nb (samr / 0x726D6173), 8000 Hz, mono, flt, 12 kb/s (default)
Metadata:
creation_time : 2017-11-30 03:22:41
handler_name : SoundHandle
[libx264 @ 0xb5bc4400] using SAR=1/1
[libx264 @ 0xb5bc4400] using cpu capabilities: none!
[libx264 @ 0xb5bc4400] profile High, level 1.1
[libx264 @ 0xb5bc4400] 264 - core 148 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: 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=5 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=25 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
[aac @ 0xb5bc4c00] Too many bits 20480.000000 > 6144 per frame requested, clamping to max
Output #0, ipod, to '/storage/emulated/0/target.m4a':
Metadata:
major_brand : 3gp4
minor_version : 0
compatible_brands: isom3gp4
com.android.version: 6.0.1
encoder : Lavf57.25.100
Stream #0:0(eng): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 144x176 [SAR 1:1 DAR 9:11], q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc (default)
Metadata:
handler_name : VideoHandle
creation_time : 2017-11-30 03:22:41
encoder : Lavc57.24.102 libx264
Side data:
unknown side data type 10 (24 bytes)
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 8000 Hz, mono, fltp, 48 kb/s (default)
Metadata:
creation_time : 2017-11-30 03:22:41
handler_name : SoundHandle
encoder : Lavc57.24.102 aac
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (amr_nb (amrnb) -> aac (native))
Press [q] to stop, [?] for help
frame= 47 fps=0.0 q=0.0 size= 0kB time=00:00:00.76 bitrate= 0.5kbits/s speed=1.53x
frame= 69 fps= 68 q=29.0 size= 12kB time=00:00:01.79 bitrate= 56.3kbits/s speed=1.77x
frame= 88 fps= 57 q=29.0 size= 22kB time=00:00:02.30 bitrate= 76.5kbits/s speed=1.49x
frame= 110 fps= 54 q=29.0 size= 31kB time=00:00:02.81 bitrate= 89.9kbits/s speed=1.37x
frame= 118 fps= 45 q=29.0 size= 34kB time=00:00:03.84 bitrate= 71.5kbits/s speed=1.47x
frame= 144 fps= 46 q=29.0 size= 44kB time=00:00:03.84 bitrate= 93.7kbits/s speed=1.23x
frame= 150 fps= 41 q=29.0 size= 48kB time=00:00:04.86 bitrate= 80.6kbits/s speed=1.34x
frame= 178 fps= 42 q=29.0 size= 62kB time=00:00:04.86 bitrate= 105.2kbits/s speed=1.16x
frame= 185 fps= 39 q=29.0 size= 67kB time=00:00:05.88 bitrate= 93.4kbits/s speed=1.25x
frame= 206 fps= 40 q=29.0 size= 78kB time=00:00:05.88 bitrate= 108.5kbits/s speed=1.13x
frame= 214 fps= 37 q=29.0 size= 84kB time=00:00:06.91 bitrate= 99.8kbits/s speed=1.21x
frame= 238 fps= 38 q=29.0 size= 100kB time=00:00:06.91 bitrate= 118.0kbits/s speed=1.11x
frame= 249 fps= 37 q=29.0 size= 106kB time=00:00:07.93 bitrate= 109.3kbits/s speed=1.18x
frame= 268 fps= 37 q=29.0 size= 119kB time=00:00:08.19 bitrate= 119.1kbits/s speed=1.13x
frame= 279 fps= 36 q=29.0 size= 127kB time=00:00:08.96 bitrate= 116.4kbits/s speed=1.16x
frame= 298 fps= 36 q=29.0 size= 140kB time=00:00:09.21 bitrate= 124.4kbits/s speed=1.11x
frame= 308 fps= 35 q=29.0 size= 149kB time=00:00:09.98 bitrate= 122.3kbits/s speed=1.14x
frame= 328 fps= 35 q=29.0 size= 162kB time=00:00:10.24 bitrate= 129.5kbits/s speed= 1.1x
frame= 343 fps= 35 q=29.0 size= 172kB time=00:00:10.88 bitrate= 129.2kbits/s speed=1.11x
frame= 358 fps= 35 q=29.0 size= 180kB time=00:00:11.90 bitrate= 124.0kbits/s speed=1.15x
frame= 387 fps= 36 q=29.0 size= 195kB time=00:00:11.90 bitrate= 134.1kbits/s speed=1.09x
frame= 398 fps= 35 q=29.0 size= 202kB time=00:00:12.92 bitrate= 127.9kbits/s speed=1.14x
frame= 418 fps= 35 q=29.0 size= 213kB time=00:00:13.31 bitrate= 131.3kbits/s speed=1.12x
frame= 432 fps= 35 q=29.0 size= 222kB time=00:00:13.95 bitrate= 130.3kbits/s speed=1.13x
frame= 448 fps= 35 q=29.0 size= 230kB time=00:00:14.59 bitrate= 129.0kbits/s speed=1.13x
frame= 469 fps= 35 q=29.0 size= 242kB time=00:00:14.97 bitrate= 132.5kbits/s speed=1.11x
frame= 478 fps= 34 q=29.0 size= 247kB time=00:00:15.87 bitrate= 127.6kbits/s speed=1.14x
frame= 509 fps= 35 q=29.0 size= 259kB time=00:00:16.00 bitrate= 132.8kbits/s dup=1 drop=0 speed=1.11x
frame= 525 fps= 35 q=29.0 size= 266kB time=00:00:17.02 bitrate= 127.8kbits/s dup=1 drop=0 speed=1.13x
frame= 539 fps= 35 q=29.0 size= 271kB time=00:00:17.79 bitrate= 124.5kbits/s dup=1 drop=0 speed=1.15x
frame= 564 fps= 35 q=29.0 size= 285kB time=00:00:18.04 bitrate= 129.4kbits/s dup=1 drop=0 speed=1.13x
frame= 574 fps= 35 q=29.0 size= 290kB time=00:00:19.07 bitrate= 124.8kbits/s dup=1 drop=0 speed=1.15x
frame= 590 fps= 35 q=29.0 size= 297kB time=00:00:19.45 bitrate= 125.2kbits/s dup=1 drop=0 speed=1.14x
frame= 594 fps= 33 q=-1.0 Lsize= 328kB time=00:00:19.84 bitrate= 135.2kbits/s dup=1 drop=0 speed= 1.1x
video:246kB audio:70kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 3.381132%
[libx264 @ 0xb5bc4400] frame I:3 Avg QP:22.61 size: 4103
[libx264 @ 0xb5bc4400] frame P:230 Avg QP:25.04 size: 851
[libx264 @ 0xb5bc4400] frame B:361 Avg QP:28.82 size: 121
[libx264 @ 0xb5bc4400] consecutive B-frames: 1.2% 40.7% 37.9% 20.2%
[libx264 @ 0xb5bc4400] mb I I16..4: 4.0% 49.8% 46.1%
[libx264 @ 0xb5bc4400] mb P I16..4: 0.1% 0.3% 0.2% P16..4: 52.0% 27.1% 15.1% 0.0% 0.0% skip: 5.3%
[libx264 @ 0xb5bc4400] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 43.4% 2.1% 0.3% direct: 1.7% skip:52.5% L0:39.3% L1:55.4% BI: 5.3%
[libx264 @ 0xb5bc4400] 8x8 transform intra:51.7% inter:57.7%
[libx264 @ 0xb5bc4400] coded y,uvDC,uvAC intra: 81.9% 93.5% 80.4% inter: 11.9% 40.0% 17.4%
[libx264 @ 0xb5bc4400] i16 v,h,dc,p: 11% 25% 7% 57%
[libx264 @ 0xb5bc4400] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 7% 20% 16% 6% 11% 5% 20% 6% 9%
[libx264 @ 0xb5bc4400] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 11% 22% 14% 5% 10% 7% 19% 5% 7%
[libx264 @ 0xb5bc4400] i8c dc,h,v,p: 61% 18% 10% 10%
[libx264 @ 0xb5bc4400] Weighted P-Frames: Y:24.3% UV:22.2%
[libx264 @ 0xb5bc4400] ref P L0: 57.6% 14.3% 16.8% 8.9% 2.3%
[libx264 @ 0xb5bc4400] ref B L0: 76.3% 19.1% 4.6%
[libx264 @ 0xb5bc4400] ref B L1: 91.9% 8.1%
[libx264 @ 0xb5bc4400] kb/s:101.58
[aac @ 0xb5bc4c00] Qavg: 64130.668
success ffmpeg
end encoding
ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 4.8 (GCC)
configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
libavutil 55. 17.103 / 55. 17.103
libavcodec 57. 24.102 / 57. 24.102
libavformat 57. 25.100 / 57. 25.100
libavdevice 57. 0.101 / 57. 0.101
libavfilter 6. 31.100 / 6. 31.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/tempVid.mp4':
Metadata:
major_brand : 3gp4
minor_version : 0
compatible_brands: isom3gp4
creation_time : 2017-11-30 03:22:41
com.android.version: 6.0.1
Duration: 00:00:19.80, start: 0.000000, bitrate: 4246 kb/s
Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 176x144, 4112 kb/s, SAR 1:1 DAR 11:9, 29.94 fps, 29.97 tbr, 90k tbn, 180k tbc (default)
Metadata:
rotate : 270
creation_time : 2017-11-30 03:22:41
handler_name : VideoHandle
Side data:
displaymatrix: rotation of 90.00 degrees
Stream #0:1(eng): Audio: amr_nb (samr / 0x726D6173), 8000 Hz, mono, flt, 12 kb/s (default)
Metadata:
creation_time : 2017-11-30 03:22:41
handler_name : SoundHandle
[libx264 @ 0xb5bc4400] using SAR=1/1
[libx264 @ 0xb5bc4400] using cpu capabilities: none!
[libx264 @ 0xb5bc4400] profile High, level 1.1
[libx264 @ 0xb5bc4400] 264 - core 148 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: 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=5 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=25 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
[aac @ 0xb5bc4c00] Too many bits 20480.000000 > 6144 per frame requested, clamping to max
Output #0, ipod, to '/storage/emulated/0/target.m4a':
Metadata:
major_brand : 3gp4
minor_version : 0
compatible_brands: isom3gp4
com.android.version: 6.0.1
encoder : Lavf57.25.100
Stream #0:0(eng): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 144x176 [SAR 1:1 DAR 9:11], q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc (default)
Metadata:
handler_name : VideoHandle
creation_time : 2017-11-30 03:22:41
encoder : Lavc57.24.102 libx264
Side data:
unknown side data type 10 (24 bytes)
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 8000 Hz, mono, fltp, 48 kb/s (default)
Metadata:
creation_time : 2017-11-30 03:22:41
handler_name : SoundHandle
encoder : Lavc57.24.102 aac
Stream mapping:
Stream #0:0 -> #0:0 (h26
</p> -
C flags which gives priority to quality for decoded images in ffmpeg
18 janvier 2016, par Tank2005I’m trying to decode h.264 streaming with ffmpeg(latest version) on Android NDK.
I succeeded to get a decoded frame. But, an aquired image is very dirty even if low latency flag is disabled.
If I want to give priority to quality over decoding speed, which flags should I specify ?
bool initCodec(bool low_latency)
{
av_register_all();
codec = avcodec_find_decoder(AV_CODEC_ID_H264);
if(!codec) return false;
context = avcodec_alloc_context3(codec);
if(!context) return false;
if(codec->capabilities & CODEC_CAP_TRUNCATED) context->flags |= CODEC_FLAG_TRUNCATED;
if(low_latency == true) context->flags |= CODEC_FLAG_LOW_DELAY;
frame = av_frame_alloc();
int res = avcodec_open2(context, codec, NULL);
if (res < 0) {
qDebug() << "Coundn't open codec :" << res;
return false;
}
av_init_packet(&avpkt);
return true;
}
void sendBytes(unsigned char *buf, int buflen)
{
avpkt.size = buflen;
avpkt.data = buf;
int got_frame, len;
while (avpkt.size > 0) {
len = avcodec_decode_video2(context, frame, &got_frame, &avpkt);
if (len < 0) {
qDebug() << "Error while decoding : " << len;
break;
}
if (got_frame) {
onGotFrame(frame);
}
avpkt.size -= len;
avpkt.data += len;
}
}
Ex : I heard that it made a problem while compiling the library. So I write a compile option here(I built it on OpenSUSE Linux).
#!/bin/bash
NDK=/home/ndk
SYSROOT=$NDK/platforms/android-9/arch-arm/
TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
function build_one
{
./configure \
--prefix=$PREFIX \
--enable-shared \
--disable-static \
--disable-avdevice \
--disable-doc \
--disable-symver \
--disable-encoders \
--disable-decoders \
--enable-decoder=h264 \
--enable-decoder=aac \
--disable-protocols \
--disable-demuxers \
--disable-muxers \
--disable-filters \
--disable-network \
--disable-parsers \
--cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
--target-os=linux \
--arch=arm \
--enable-asm --enable-yasm \
--enable-cross-compile \
--sysroot=$SYSROOT \
--extra-cflags="-Os -marm -march=armv7-a -mfloat-abi=softfp -mfpu=neon" \
--extra-ldflags="-Wl,--fix-cortex-a8" \
$ADDITIONAL_CONFIGURE_FLAG
make clean
make
make install
}
CPU=armv7-a
PREFIX=$(pwd)/android/$CPU
build_on
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