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Richard Stallman et le logiciel libre
19 octobre 2011, par
Mis à jour : Mai 2013
Langue : français
Type : Texte
Autres articles (87)
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If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...) -
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13 septembre 2013Jolie sélection multiple
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Sur d’autres sites (11397)
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avformat/demux : Remove fake-loop
9 décembre 2021, par Andreas Rheinhardt -
File encoded as FFV1 with ffmpeg is unplayable
18 novembre 2016, par Ali AlidoustI’m using the following code to encode a series of frames into an mkv or avi file with FFV1 encoding :
HRESULT Session::createContext(LPCSTR filepath, UINT width, UINT height, UINT fps_num, UINT fps_den) {
LOG(filepath);
this->codec = avcodec_find_encoder(AV_CODEC_ID_FFV1);
RET_IF_NULL(this->codec, "Could not create codec", E_FAIL);
this->oformat = av_guess_format(NULL, filepath, NULL);
RET_IF_NULL(this->oformat, "Could not create format", E_FAIL);
this->oformat->video_codec = AV_CODEC_ID_FFV1;
this->width = width;
this->height = height;
this->context = avcodec_alloc_context3(this->codec);
RET_IF_NULL(this->context, "Could not allocate context for the codec", E_FAIL);
this->context->codec = this->codec;
this->context->codec_id = AV_CODEC_ID_FFV1;
this->context->codec_type = AVMEDIA_TYPE_VIDEO;
this->context->pix_fmt = AV_PIX_FMT_YUV420P;
this->context->width = this->width;
this->context->height = this->height;
this->context->time_base.num = fps_num;
this->context->time_base.den = fps_den;
this->context->gop_size = 1;
av_opt_set_int(this->context->priv_data, "coder", 0, 0);
av_opt_set_int(this->context->priv_data, "context", 1, 0);
av_opt_set_int(this->context->priv_data, "slicecrc", 1, 0);
avformat_alloc_output_context2(&fmtContext, NULL, NULL, filepath);
this->fmtContext->oformat = this->oformat;
this->fmtContext->video_codec_id = AV_CODEC_ID_FFV1;
this->stream = avformat_new_stream(this->fmtContext, this->codec);
RET_IF_NULL(this->fmtContext, "Could not create new stream", E_FAIL);
avcodec_parameters_from_context(this->stream->codecpar, this->context);
this->stream->codecpar->level = 3;
/*if (this->fmtContext->oformat->flags & AVFMT_GLOBALHEADER)
{*/
this->context->flags |= CODEC_FLAG_GLOBAL_HEADER;
/*}*/
RET_IF_FAILED_AV(avcodec_open2(this->context, this->codec, NULL), "Could not open codec", E_FAIL);
RET_IF_FAILED_AV(avio_open(&this->fmtContext->pb, filepath, AVIO_FLAG_READ_WRITE), "Could not open output file", E_FAIL);
RET_IF_NULL(this->fmtContext->pb, "Could not open output file", E_FAIL);
RET_IF_FAILED_AV(avformat_write_header(this->fmtContext, NULL), "Could not write header", E_FAIL);
frame = av_frame_alloc();
RET_IF_NULL(frame, "Could not allocate frame", E_FAIL);
frame->format = this->context->pix_fmt;
frame->width = width;
frame->height = height;
// RET_IF_FAILED(av_image_alloc(frame->data, frame->linesize, context->width, context->height, context->pix_fmt, 32), "Could not allocate image", E_FAIL);
return S_OK;
}
HRESULT Session::writeFrame(IMFSample * pSample) {
IMFMediaBuffer *mediaBuffer = NULL;
BYTE *pData = NULL;
DWORD length;
RET_IF_FAILED(pSample->ConvertToContiguousBuffer(&mediaBuffer), "Could not convert IMFSample to contagiuous buffer", E_FAIL);
RET_IF_FAILED(mediaBuffer->GetCurrentLength(&length), "Could not get buffer length", E_FAIL);
RET_IF_FAILED(mediaBuffer->Lock(&pData, NULL, NULL), "Could not lock the buffer", E_FAIL);
RET_IF_FAILED(av_image_fill_arrays(frame->data, frame->linesize, pData, AV_PIX_FMT_YUV420P, this->width, this->height, 1), "Could not fill the frame with data from the buffer", E_FAIL);
LOG_IF_FAILED(mediaBuffer->Unlock(), "Could not unlock the buffer");
frame->pts = this->pts++;
AVPacket pkt;
av_init_packet(&pkt);
pkt.data = NULL;
pkt.size = 0;
RET_IF_FAILED_AV(avcodec_send_frame(this->context, frame), "Could not send the frame to the encoder", E_FAIL);
if (SUCCEEDED(avcodec_receive_packet(this->context, &pkt))) {
RET_IF_FAILED_AV(av_interleaved_write_frame(this->fmtContext, &pkt), "Could not write the received packet.", E_FAIL);
}
av_packet_unref(&pkt);
return S_OK;
}
HRESULT Session::endSession() {
LOG("Ending session...");
LOG("Closing files...");
av_write_trailer(this->fmtContext);
avio_close(this->fmtContext->pb);
avcodec_close(this->context);
av_free(this->context);
//fclose(this->file);
LOG("Done.");
return S_OK;
}The problem is that the generated file is not playable in either VLC or MPC-HC. However, MPC-HC reports following info in file properties :
General
Unique ID : 202978442142665779317960161865934977227 (0x98B439D9BE859109BD5EC00A62A238CB)
Complete name : T:\Test.mkv
Format : Matroska
Format version : Version 4 / Version 2
File size : 24.6 MiB
Duration : 147ms
Overall bit rate : 1 401 Mbps
Writing application : Lavf57.57.100
Writing library : Lavf57.57.100
Video
ID : 1
Format : FFV1
Format version : Version 0
Codec ID : V_MS/VFW/FOURCC / FFV1
Duration : 147ms
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 1 000.000 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Compression mode : Lossless
Default : Yes
Forced : No
DURATION : 00:00:00.147000000
coder_type : Golomb RiceSomething to note is that it reports 1000 FPS which is weird since I’ve set
AVCodecContext::time_base
in the code. -
configure : Use a separate config_components.h header for $ALL_COMPONENTS
23 février 2022, par Martin Storsjöconfigure : Use a separate config_components.h header for $ALL_COMPONENTS
This avoids unnecessary rebuilds of most source files if only the
list of enabled components has changed, but not the other properties
of the build, set in config.h.Signed-off-by : Martin Storsjö <martin@martin.st>
- [DH] configure
- [DH] fftools/ffplay.c
- [DH] libavcodec/8svx.c
- [DH] libavcodec/a64multienc.c
- [DH] libavcodec/aac_ac3_parser.c
- [DH] libavcodec/aactab.c
- [DH] libavcodec/aarch64/h264cmc_neon.S
- [DH] libavcodec/ac3_parser.c
- [DH] libavcodec/ac3dec.c
- [DH] libavcodec/ac3dec_float.c
- [DH] libavcodec/ac3enc.c
- [DH] libavcodec/ac3enc_template.c
- [DH] libavcodec/adpcm.c
- [DH] libavcodec/adpcmenc.c
- [DH] libavcodec/allcodecs.c
- [DH] libavcodec/amfenc.c
- [DH] libavcodec/aptxdec.c
- [DH] libavcodec/aptxenc.c
- [DH] libavcodec/arm/flacdsp_init_arm.c
- [DH] libavcodec/arm/h264cmc_neon.S
- [DH] libavcodec/assdec.c
- [DH] libavcodec/assenc.c
- [DH] libavcodec/asvdec.c
- [DH] libavcodec/asvenc.c
- [DH] libavcodec/audiotoolboxdec.c
- [DH] libavcodec/av1dec.c
- [DH] libavcodec/binkaudio.c
- [DH] libavcodec/bintext.c
- [DH] libavcodec/bsf.c
- [DH] libavcodec/crystalhd.c
- [DH] libavcodec/cuviddec.c
- [DH] libavcodec/cyuv.c
- [DH] libavcodec/dxva2_av1.c
- [DH] libavcodec/dxva2_h264.c
- [DH] libavcodec/dxva2_hevc.c
- [DH] libavcodec/dxva2_mpeg2.c
- [DH] libavcodec/dxva2_vc1.c
- [DH] libavcodec/dxva2_vp9.c
- [DH] libavcodec/flashsv.c
- [DH] libavcodec/g726.c
- [DH] libavcodec/gsmdec.c
- [DH] libavcodec/h263dec.c
- [DH] libavcodec/h264_slice.c
- [DH] libavcodec/h264dec.c
- [DH] libavcodec/hevcdec.c
- [DH] libavcodec/huffyuvdec.c
- [DH] libavcodec/huffyuvenc.c
- [DH] libavcodec/idctdsp.c
- [DH] libavcodec/iff.c
- [DH] libavcodec/imc.c
- [DH] libavcodec/ituh263dec.c
- [DH] libavcodec/ituh263enc.c
- [DH] libavcodec/lcldec.c
- [DH] libavcodec/libgsmdec.c
- [DH] libavcodec/libgsmenc.c
- [DH] libavcodec/libopencore-amr.c
- [DH] libavcodec/libvpx.c
- [DH] libavcodec/libvpxdec.c
- [DH] libavcodec/libvpxenc.c
- [DH] libavcodec/libx264.c
- [DH] libavcodec/me_cmp.c
- [DH] libavcodec/mediacodecdec.c
- [DH] libavcodec/metasound_data.c
- [DH] libavcodec/mjpegdec.c
- [DH] libavcodec/mjpegenc.c
- [DH] libavcodec/mlpdec.c
- [DH] libavcodec/mlpenc.c
- [DH] libavcodec/mpeg12dec.c
- [DH] libavcodec/mpeg12enc.c
- [DH] libavcodec/mpeg4videodec.c
- [DH] libavcodec/mpegaudiodec_fixed.c
- [DH] libavcodec/mpegaudiodec_float.c
- [DH] libavcodec/mpegaudiodec_template.c
- [DH] libavcodec/mpegvideo.c
- [DH] libavcodec/mpegvideo_enc.c
- [DH] libavcodec/mpegvideo_motion.c
- [DH] libavcodec/msmpeg4.c
- [DH] libavcodec/msmpeg4dec.c
- [DH] libavcodec/mvcdec.c
- [DH] libavcodec/nvdec.c
- [DH] libavcodec/nvdec_mjpeg.c
- [DH] libavcodec/nvdec_mpeg12.c
- [DH] libavcodec/nvdec_vc1.c
- [DH] libavcodec/nvenc.c
- [DH] libavcodec/options.c
- [DH] libavcodec/options_table.h
- [DH] libavcodec/opus_pvq.c
- [DH] libavcodec/pcm.c
- [DH] libavcodec/pngdec.c
- [DH] libavcodec/pnmdec.c
- [DH] libavcodec/pnmenc.c
- [DH] libavcodec/proresdec2.c
- [DH] libavcodec/qpeldsp.c
- [DH] libavcodec/qsvdec.c
- [DH] libavcodec/qsvenc.c
- [DH] libavcodec/r210dec.c
- [DH] libavcodec/r210enc.c
- [DH] libavcodec/rv34_parser.c
- [DH] libavcodec/sonic.c
- [DH] libavcodec/sp5xdec.c
- [DH] libavcodec/speedhq.c
- [DH] libavcodec/speedhqenc.c
- [DH] libavcodec/srtdec.c
- [DH] libavcodec/srtenc.c
- [DH] libavcodec/tests/dct.c
- [DH] libavcodec/tests/x86/dct.c
- [DH] libavcodec/textdec.c
- [DH] libavcodec/v408dec.c
- [DH] libavcodec/v408enc.c
- [DH] libavcodec/vaapi_decode.c
- [DH] libavcodec/vaapi_encode.c
- [DH] libavcodec/vaapi_mpeg4.c
- [DH] libavcodec/vaapi_vc1.c
- [DH] libavcodec/vc1dec.c
- [DH] libavcodec/vc1dsp.c
- [DH] libavcodec/vdpau.c
- [DH] libavcodec/vdpau_mpeg12.c
- [DH] libavcodec/vdpau_vc1.c
- [DH] libavcodec/videotoolbox.c
- [DH] libavcodec/vorbis_parser.c
- [DH] libavcodec/vp3.c
- [DH] libavcodec/vp56dsp.c
- [DH] libavcodec/vp8.c
- [DH] libavcodec/vp8dsp.c
- [DH] libavcodec/vp9.c
- [DH] libavcodec/wmadec.c
- [DH] libavcodec/wmaenc.c
- [DH] libavcodec/x86/flacdsp_init.c
- [DH] libavcodec/x86/hpeldsp_init.c
- [DH] libavdevice/alsa.c
- [DH] libavdevice/iec61883.c
- [DH] libavfilter/aeval.c
- [DH] libavfilter/af_afade.c
- [DH] libavfilter/af_agate.c
- [D