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Autres articles (59)
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Mise à jour de la version 0.1 vers 0.2
24 juin 2013, parExplications des différents changements notables lors du passage de la version 0.1 de MediaSPIP à la version 0.3. Quelles sont les nouveautés
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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Ecrire une actualité
21 juin 2013, parPrésentez les changements dans votre MédiaSPIP ou les actualités de vos projets sur votre MédiaSPIP grâce à la rubrique actualités.
Dans le thème par défaut spipeo de MédiaSPIP, les actualités sont affichées en bas de la page principale sous les éditoriaux.
Vous pouvez personnaliser le formulaire de création d’une actualité.
Formulaire de création d’une actualité Dans le cas d’un document de type actualité, les champs proposés par défaut sont : Date de publication ( personnaliser la date de publication ) (...)
Sur d’autres sites (6844)
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How to get xml/json output when ffprobe could not find codec parameters for a stream
9 juin 2015, par user2421731I was using ffprobe on a mkv file in order to get some info about the chapter structure so as to split the mkv using ffmpeg.
ffprobe miku.mkv -print_format xmlHowever ffprobe encountered an scodec error(does not affect chapter info) and I could not get the info by setting print format. I know there are ways like pipeline to bypass the error, but I still want to get the xml/json file so it can be parsed easily.
I wonder if there is a way to ingore the error and output the xml/json file or is there a solution to the error. (But I prefer a solution to the former, because I don’t know what any errors I might encounter and I’d like to see it works as long as the chapter info is available)
The error was like this.
ffprobe version N-60899-ga8ad7e4 Copyright (c) 2007-2014 the FFmpeg developers built on Feb 25 2014 04:04:01 with gcc 4.8.2 (GCC) configuration : —enable-gpl —enable-version3 —disable-w32threads —enable-avisynth —enable-bzlib —enable-fontconfig —enable-frei0r —enable-gnutls —enable-iconv —enable-libass —enable-libbluray —enable-libcaca —enable-libfreetype —enable-libgsm —enable-libilbc —enable-libmodplug —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenjpeg —enable-libopus —enable-librtmp —enable-libschroedinger —enable-libsoxr —enable-libspeex —enable-libtheora —enable-libtwolame —enable-libvidstab —enable-libvo-aacenc —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libx264 —enable-libx265 —enable-libxavs —enable-libxvid —enable-zlib libavutil 52. 66.100 / 52. 66.100 libavcodec 55. 52.102 / 55. 52.102 libavformat 55. 33.100 / 55. 33.100 libavdevice 55. 10.100 / 55. 10.100 libavfilter 4. 1.103 / 4. 1.103 libswscale 2. 5.101 / 2. 5.101 libswresample 0. 18.100 / 0. 18.100 libpostproc 52. 3.100 / 52. 3.100 [matroska,webm @ 0000000002945080] Could not find codec parameters for stream 3 (Subtitle : hdmv_pgs_subtitle) : unspecified size Consider increasing the value for the ’analyzeduration’ and ’probesize’ options Input #0, matroska,webm, from ’[Hatsune Miku Magical Mirai 2013][JPN][BDRIP][1080P][H264_FLAC_DTS-HDMA].mkv’ : Metadata : encoder : libebml v1.3.0 + libmatroska v1.4.1 creation_time : 2014-02-18 22:57:12 Duration : 01:58:00.08, start : 0.000000, bitrate : 16495 kb/s Chapter #0.0 : start 0.000000, end 30.030000 Metadata : title : Start Chapter #0.1 : start 30.030000, end 149.749000 Metadata : title : 00. Opening Music ...... -
Resultant video stream unplayable
29 novembre 2017, par Nikolai LinetskiyCurrently I’m writing software for transcoding media files using ffmpeg libs. The problem is that in case of H264 QuickTime cannot play result stream and shows black screen. Audio streams work as expected. I have read that QuickTime can deal only with
yuv420ppixel format and that is true for encoded video.I looked through the ffmpeg examples and ffmpeg source code and could not find anything find any clues where the problem might be. I would really appreciate any help.
The only thing I managed to get from QuickTime is
SeqAndPicParamSetFromCFDictionaryRef, bad config recordmessage in console. Same thing is logged by AVPlayer from AVFoundation.Here is the initialization of output streams and encoders.
int status;
// avformat_alloc_output_context2()
if ((status = formatContext.open(destFilename)) < 0) {
return status;
}
AVDictionary *fmtOptions = nullptr;
av_dict_set(&fmtOptions, "movflags", "faststart", 0);
av_dict_set(&fmtOptions, "brand", "mp42", 0);
streams.resize(input->getStreamsCount());
for (int i = 0; i < input->getStreamsCount(); ++i) {
AVStream *inputStream = input->getStreamAtIndex(i);
CodecContext &decoderContext = input->getDecoderAtIndex(i);
// retrieve output codec by codec id
auto encoderCodecId = decoderContext.getCodecID();;
if (decoderContext.getCodecType() == AVMEDIA_TYPE_VIDEO || decoderContext.getCodecType() == AVMEDIA_TYPE_AUDIO) {
int codecIdKey = decoderContext.getCodecType() == AVMEDIA_TYPE_AUDIO ? IPROC_KEY_INT(TargetAudioCodecID) : IPROC_KEY_INT(TargetVideoCodecID);
auto codecIdParam = static_cast<avcodecid>(params[codecIdKey]);
if (codecIdParam != AV_CODEC_ID_NONE) {
encoderCodecId = codecIdParam;
}
}
AVCodec *encoder = nullptr;
if ((encoder = avcodec_find_encoder(encoderCodecId)) == nullptr) {
status = AVERROR_ENCODER_NOT_FOUND;
return status;
}
// create stream with specific codec and format
AVStream *outputStream = nullptr;
// avformat_new_stream()
if ((outputStream = formatContext.newStream(encoder)) == nullptr) {
return AVERROR(ENOMEM);
}
CodecContext encoderContext;
// avcodec_alloc_context3()
if ((status = encoderContext.init(encoder)) < 0) {
return status;
}
outputStream->disposition = inputStream->disposition;
encoderContext.getRawCtx()->chroma_sample_location = decoderContext.getRawCtx()->chroma_sample_location;
if (encoderContext.getCodecType() == AVMEDIA_TYPE_VIDEO) {
auto lang = av_dict_get(input->getStreamAtIndex(i)->metadata, "language", nullptr, 0);
if (lang) {
av_dict_set(&outputStream->metadata, "language", lang->value, 0);
}
// prepare encoder context
int targetWidth = params[IPROC_KEY_INT(TargetVideoWidth)];
int targetHeight = params[IPROC_KEY_INT(TargetVideHeight)];
encoderContext.width() = targetWidth > 0 ? targetWidth : decoderContext.width();
encoderContext.height() = targetHeight > 0 ? targetHeight : decoderContext.height();
encoderContext.pixelFormat() = encoder->pix_fmts ? encoder->pix_fmts[0] : decoderContext.pixelFormat();;
encoderContext.timeBase() = decoderContext.timeBase();
encoderContext.getRawCtx()->level = 31;
encoderContext.getRawCtx()->gop_size = 25;
double far = static_cast<double>(encoderContext.getRawCtx()->width) / encoderContext.getRawCtx()->height;
double dar = static_cast<double>(decoderContext.width()) / decoderContext.height();
encoderContext.sampleAspectRatio() = av_d2q(dar / far, 255);
encoderContext.getRawCtx()->bits_per_raw_sample = FFMIN(decoderContext.getRawCtx()->bits_per_raw_sample,
av_pix_fmt_desc_get(encoderContext.pixelFormat())->comp[0].depth);
encoderContext.getRawCtx()->framerate = inputStream->r_frame_rate;
outputStream->avg_frame_rate = encoderContext.getRawCtx()->framerate;
VideoFilterGraphParameters params;
params.height = encoderContext.height();
params.width = encoderContext.width();
params.pixelFormat = encoderContext.pixelFormat();
if ((status = generateGraph(decoderContext, encoderContext, params, streams[i].filterGraph)) < 0) {
return status;
}
} else if (encoderContext.getCodecType() == AVMEDIA_TYPE_AUDIO) {
auto lang = av_dict_get(input->getStreamAtIndex(i)->metadata, "language", nullptr, 0);
if (lang) {
av_dict_set(&outputStream->metadata, "language", lang->value, 0);
}
encoderContext.sampleRate() = params[IPROC_KEY_INT(TargetAudioSampleRate)] ? : decoderContext.sampleRate();
encoderContext.channels() = params[IPROC_KEY_INT(TargetAudioChannels)] ? : decoderContext.channels();
auto paramChannelLayout = params[IPROC_KEY_INT(TargetAudioChannelLayout)];
if (paramChannelLayout) {
encoderContext.channelLayout() = paramChannelLayout;
} else {
encoderContext.channelLayout() = av_get_default_channel_layout(encoderContext.channels());
}
AVSampleFormat sampleFormatParam = static_cast<avsampleformat>(params[IPROC_KEY_INT(TargetAudioSampleFormat)]);
if (sampleFormatParam != AV_SAMPLE_FMT_NONE) {
encoderContext.sampleFormat() = sampleFormatParam;
} else if (encoder->sample_fmts) {
encoderContext.sampleFormat() = encoder->sample_fmts[0];
} else {
encoderContext.sampleFormat() = decoderContext.sampleFormat();
}
encoderContext.timeBase().num = 1;
encoderContext.timeBase().den = encoderContext.sampleRate();
AudioFilterGraphParameters params;
params.channelLayout = encoderContext.channelLayout();
params.channels = encoderContext.channels();
params.format = encoderContext.sampleFormat();
params.sampleRate = encoderContext.sampleRate();
if ((status = generateGraph(decoderContext, encoderContext, params, streams[i].filterGraph)) < 0) {
return status;
}
}
// before using encoder, we should open it and update its parameters
printf("Codec bits per sample %d\n", av_get_bits_per_sample(encoderCodecId));
AVDictionary *options = nullptr;
// avcodec_open2()
if ((status = encoderContext.open(encoder, &options)) < 0) {
return status;
}
if (streams[i].filterGraph) {
streams[i].filterGraph.setOutputFrameSize(encoderContext.getFrameSize());
}
// avcodec_parameters_from_context()
if ((status = encoderContext.fillParamters(outputStream->codecpar)) < 0) {
return status;
}
outputStream->codecpar->format = encoderContext.getRawCtx()->pix_fmt;
if (formatContext.getRawCtx()->oformat->flags & AVFMT_GLOBALHEADER) {
encoderContext.getRawCtx()->flags |= CODEC_FLAG_GLOBAL_HEADER;
}
if (encoderContext.getRawCtx()->nb_coded_side_data) {
int i;
for (i = 0; i < encoderContext.getRawCtx()->nb_coded_side_data; i++) {
const AVPacketSideData *sd_src = &encoderContext.getRawCtx()->coded_side_data[i];
uint8_t *dst_data;
dst_data = av_stream_new_side_data(outputStream, sd_src->type, sd_src->size);
if (!dst_data)
return AVERROR(ENOMEM);
memcpy(dst_data, sd_src->data, sd_src->size);
}
}
/*
* Add global input side data. For now this is naive, and copies it
* from the input stream's global side data. All side data should
* really be funneled over AVFrame and libavfilter, then added back to
* packet side data, and then potentially using the first packet for
* global side data.
*/
for (int i = 0; i < inputStream->nb_side_data; i++) {
AVPacketSideData *sd = &inputStream->side_data[i];
uint8_t *dst = av_stream_new_side_data(outputStream, sd->type, sd->size);
if (!dst)
return AVERROR(ENOMEM);
memcpy(dst, sd->data, sd->size);
}
// copy timebase while removing common factors
if (outputStream->time_base.num <= 0 || outputStream->time_base.den <= 0) {
outputStream->time_base = av_add_q(encoderContext.timeBase(), (AVRational){0, 1});
}
// copy estimated duration as a hint to the muxer
if (outputStream->duration <= 0 && inputStream->duration > 0) {
outputStream->duration = av_rescale_q(inputStream->duration, inputStream->time_base, outputStream->time_base);
}
streams[i].codecType = encoderContext.getRawCtx()->codec_type;
streams[i].codec = std::move(encoderContext);
streams[i].streamIndex = i;
}
// avio_open() and avformat_write_header()
if ((status = formatContext.writeHeader(fmtOptions)) < 0) {
return status;
}
formatContext.dumpFormat();
</avsampleformat></double></double></avcodecid>Reading from stream.
int InputProcessor::performStep() {
int status;
Packet nextPacket;
if ((status = input->getFormatContext().readFrame(nextPacket)) < 0) {
return status;
}
++streams[nextPacket.getStreamIndex()].readPackets;
int streamIndex = nextPacket.getStreamIndex();
CodecContext &decoder = input->getDecoderAtIndex(streamIndex);
AVStream *inputStream = input->getStreamAtIndex(streamIndex);
if (streams[nextPacket.getStreamIndex()].readPackets == 1) {
for (int i = 0; i < inputStream->nb_side_data; ++i) {
AVPacketSideData *src_sd = &inputStream->side_data[i];
uint8_t *dst_data;
if (src_sd->type == AV_PKT_DATA_DISPLAYMATRIX) {
continue;
}
if (av_packet_get_side_data(nextPacket.getRawPtr(), src_sd->type, nullptr)) {
continue;
}
dst_data = av_packet_new_side_data(nextPacket.getRawPtr(), src_sd->type, src_sd->size);
if (!dst_data) {
return AVERROR(ENOMEM);
}
memcpy(dst_data, src_sd->data, src_sd->size);
}
}
nextPacket.rescaleTimestamps(inputStream->time_base, decoder.timeBase());
status = decodePacket(&nextPacket, nextPacket.getStreamIndex());
if (status < 0 && status != AVERROR(EAGAIN)) {
return status;
}
return 0;
}Here is decoding/encoding code.
int InputProcessor::decodePacket(Packet *packet, int streamIndex) {
int status;
int sendStatus;
auto &decoder = input->getDecoderAtIndex(streamIndex);
do {
if (packet == nullptr) {
sendStatus = decoder.flushDecodedFrames();
} else {
sendStatus = decoder.sendPacket(*packet);
}
if (sendStatus < 0 && sendStatus != AVERROR(EAGAIN) && sendStatus != AVERROR_EOF) {
return sendStatus;
}
if (sendStatus == 0 && packet) {
++streams[streamIndex].decodedPackets;
}
Frame decodedFrame;
while (true) {
if ((status = decoder.receiveFrame(decodedFrame)) < 0) {
break;
}
++streams[streamIndex].decodedFrames;
if ((status = filterAndWriteFrame(&decodedFrame, streamIndex)) < 0) {
break;
}
decodedFrame.unref();
}
} while (sendStatus == AVERROR(EAGAIN));
return status;
}
int InputProcessor::encodeAndWriteFrame(Frame *frame, int streamIndex) {
assert(input->isValid());
assert(formatContext);
int status = 0;
int sendStatus;
Packet packet;
CodecContext &encoderContext = streams[streamIndex].codec;
do {
if (frame) {
sendStatus = encoderContext.sendFrame(*frame);
} else {
sendStatus = encoderContext.flushEncodedPackets();
}
if (sendStatus < 0 && sendStatus != AVERROR(EAGAIN) && sendStatus != AVERROR_EOF) {
return status;
}
if (sendStatus == 0 && frame) {
++streams[streamIndex].encodedFrames;
}
while (true) {
if ((status = encoderContext.receivePacket(packet)) < 0) {
break;
}
++streams[streamIndex].encodedPackets;
packet.setStreamIndex(streamIndex);
auto sourceTimebase = encoderContext.timeBase();
auto dstTimebase = formatContext.getStreams()[streamIndex]->time_base;
packet.rescaleTimestamps(sourceTimebase, dstTimebase);
if ((status = formatContext.writeFrameInterleaved(packet)) < 0) {
return status;
}
packet.unref();
}
} while (sendStatus == AVERROR(EAGAIN));
if (status != AVERROR(EAGAIN)) {
return status;
}
return 0;
}FFprobe output for original video.
Input #0, matroska,webm, from 'testvideo':
Metadata:
title : TestVideo
encoder : libebml v1.3.0 + libmatroska v1.4.0
creation_time : 2014-12-23T03:38:05.000000Z
Duration: 00:02:29.25, start: 0.000000, bitrate: 79549 kb/s
Stream #0:0(rus): Video: h264 (High 4:4:4 Predictive), yuv444p10le(pc, bt709, progressive), 2048x858 [SAR 1:1 DAR 1024:429], 24 fps, 24 tbr, 1k tbn, 48 tbc (default)
Stream #0:1(rus): Audio: pcm_s24le, 48000 Hz, 6 channels, s32 (24 bit), 6912 kb/s (default)Transcoded :
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '123.mp4':
Metadata:
major_brand : mp42
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.71.100
Duration: 00:02:29.27, start: 0.000000, bitrate: 4282 kb/s
Stream #0:0(rus): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 192:143 DAR 1024:429], 3940 kb/s, 24.01 fps, 24 tbr, 12288 tbn, 96 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(rus): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 336 kb/s (default)
Metadata:
handler_name : SoundHandler -
Transcoded video stream unplayable in QuickTime player
30 novembre 2017, par Nikolai LinetskiyCurrently I’m writing software for transcoding media files using ffmpeg libs. The problem is that in case of H264 QuickTime cannot play result stream and shows black screen. Audio streams work as expected. I have read that QuickTime can deal only with
yuv420ppixel format and that is true for encoded video.I looked through the ffmpeg examples and ffmpeg source code and could not find anything find any clues where the problem might be. I would really appreciate any help.
The only thing I managed to get from QuickTime is
SeqAndPicParamSetFromCFDictionaryRef, bad config recordmessage in console. Same thing is logged by AVPlayer from AVFoundation.Here is the initialization of output streams and encoders.
int status;
// avformat_alloc_output_context2()
if ((status = formatContext.open(destFilename)) < 0) {
return status;
}
AVDictionary *fmtOptions = nullptr;
av_dict_set(&fmtOptions, "movflags", "faststart", 0);
av_dict_set(&fmtOptions, "brand", "mp42", 0);
streams.resize(input->getStreamsCount());
for (int i = 0; i < input->getStreamsCount(); ++i) {
AVStream *inputStream = input->getStreamAtIndex(i);
CodecContext &decoderContext = input->getDecoderAtIndex(i);
// retrieve output codec by codec id
auto encoderCodecId = decoderContext.getCodecID();;
if (decoderContext.getCodecType() == AVMEDIA_TYPE_VIDEO || decoderContext.getCodecType() == AVMEDIA_TYPE_AUDIO) {
int codecIdKey = decoderContext.getCodecType() == AVMEDIA_TYPE_AUDIO ? IPROC_KEY_INT(TargetAudioCodecID) : IPROC_KEY_INT(TargetVideoCodecID);
auto codecIdParam = static_cast<avcodecid>(params[codecIdKey]);
if (codecIdParam != AV_CODEC_ID_NONE) {
encoderCodecId = codecIdParam;
}
}
AVCodec *encoder = nullptr;
if ((encoder = avcodec_find_encoder(encoderCodecId)) == nullptr) {
status = AVERROR_ENCODER_NOT_FOUND;
return status;
}
// create stream with specific codec and format
AVStream *outputStream = nullptr;
// avformat_new_stream()
if ((outputStream = formatContext.newStream(encoder)) == nullptr) {
return AVERROR(ENOMEM);
}
CodecContext encoderContext;
// avcodec_alloc_context3()
if ((status = encoderContext.init(encoder)) < 0) {
return status;
}
outputStream->disposition = inputStream->disposition;
encoderContext.getRawCtx()->chroma_sample_location = decoderContext.getRawCtx()->chroma_sample_location;
if (encoderContext.getCodecType() == AVMEDIA_TYPE_VIDEO) {
auto lang = av_dict_get(input->getStreamAtIndex(i)->metadata, "language", nullptr, 0);
if (lang) {
av_dict_set(&outputStream->metadata, "language", lang->value, 0);
}
// prepare encoder context
int targetWidth = params[IPROC_KEY_INT(TargetVideoWidth)];
int targetHeight = params[IPROC_KEY_INT(TargetVideHeight)];
encoderContext.width() = targetWidth > 0 ? targetWidth : decoderContext.width();
encoderContext.height() = targetHeight > 0 ? targetHeight : decoderContext.height();
encoderContext.pixelFormat() = encoder->pix_fmts ? encoder->pix_fmts[0] : decoderContext.pixelFormat();;
encoderContext.timeBase() = decoderContext.timeBase();
encoderContext.getRawCtx()->level = 31;
encoderContext.getRawCtx()->gop_size = 25;
double far = static_cast<double>(encoderContext.getRawCtx()->width) / encoderContext.getRawCtx()->height;
double dar = static_cast<double>(decoderContext.width()) / decoderContext.height();
encoderContext.sampleAspectRatio() = av_d2q(dar / far, 255);
encoderContext.getRawCtx()->bits_per_raw_sample = FFMIN(decoderContext.getRawCtx()->bits_per_raw_sample,
av_pix_fmt_desc_get(encoderContext.pixelFormat())->comp[0].depth);
encoderContext.getRawCtx()->framerate = inputStream->r_frame_rate;
outputStream->avg_frame_rate = encoderContext.getRawCtx()->framerate;
VideoFilterGraphParameters params;
params.height = encoderContext.height();
params.width = encoderContext.width();
params.pixelFormat = encoderContext.pixelFormat();
if ((status = generateGraph(decoderContext, encoderContext, params, streams[i].filterGraph)) < 0) {
return status;
}
} else if (encoderContext.getCodecType() == AVMEDIA_TYPE_AUDIO) {
auto lang = av_dict_get(input->getStreamAtIndex(i)->metadata, "language", nullptr, 0);
if (lang) {
av_dict_set(&outputStream->metadata, "language", lang->value, 0);
}
encoderContext.sampleRate() = params[IPROC_KEY_INT(TargetAudioSampleRate)] ? : decoderContext.sampleRate();
encoderContext.channels() = params[IPROC_KEY_INT(TargetAudioChannels)] ? : decoderContext.channels();
auto paramChannelLayout = params[IPROC_KEY_INT(TargetAudioChannelLayout)];
if (paramChannelLayout) {
encoderContext.channelLayout() = paramChannelLayout;
} else {
encoderContext.channelLayout() = av_get_default_channel_layout(encoderContext.channels());
}
AVSampleFormat sampleFormatParam = static_cast<avsampleformat>(params[IPROC_KEY_INT(TargetAudioSampleFormat)]);
if (sampleFormatParam != AV_SAMPLE_FMT_NONE) {
encoderContext.sampleFormat() = sampleFormatParam;
} else if (encoder->sample_fmts) {
encoderContext.sampleFormat() = encoder->sample_fmts[0];
} else {
encoderContext.sampleFormat() = decoderContext.sampleFormat();
}
encoderContext.timeBase().num = 1;
encoderContext.timeBase().den = encoderContext.sampleRate();
AudioFilterGraphParameters params;
params.channelLayout = encoderContext.channelLayout();
params.channels = encoderContext.channels();
params.format = encoderContext.sampleFormat();
params.sampleRate = encoderContext.sampleRate();
if ((status = generateGraph(decoderContext, encoderContext, params, streams[i].filterGraph)) < 0) {
return status;
}
}
// before using encoder, we should open it and update its parameters
printf("Codec bits per sample %d\n", av_get_bits_per_sample(encoderCodecId));
AVDictionary *options = nullptr;
// avcodec_open2()
if ((status = encoderContext.open(encoder, &options)) < 0) {
return status;
}
if (streams[i].filterGraph) {
streams[i].filterGraph.setOutputFrameSize(encoderContext.getFrameSize());
}
// avcodec_parameters_from_context()
if ((status = encoderContext.fillParamters(outputStream->codecpar)) < 0) {
return status;
}
outputStream->codecpar->format = encoderContext.getRawCtx()->pix_fmt;
if (formatContext.getRawCtx()->oformat->flags & AVFMT_GLOBALHEADER) {
encoderContext.getRawCtx()->flags |= CODEC_FLAG_GLOBAL_HEADER;
}
if (encoderContext.getRawCtx()->nb_coded_side_data) {
int i;
for (i = 0; i < encoderContext.getRawCtx()->nb_coded_side_data; i++) {
const AVPacketSideData *sd_src = &encoderContext.getRawCtx()->coded_side_data[i];
uint8_t *dst_data;
dst_data = av_stream_new_side_data(outputStream, sd_src->type, sd_src->size);
if (!dst_data)
return AVERROR(ENOMEM);
memcpy(dst_data, sd_src->data, sd_src->size);
}
}
/*
* Add global input side data. For now this is naive, and copies it
* from the input stream's global side data. All side data should
* really be funneled over AVFrame and libavfilter, then added back to
* packet side data, and then potentially using the first packet for
* global side data.
*/
for (int i = 0; i < inputStream->nb_side_data; i++) {
AVPacketSideData *sd = &inputStream->side_data[i];
uint8_t *dst = av_stream_new_side_data(outputStream, sd->type, sd->size);
if (!dst)
return AVERROR(ENOMEM);
memcpy(dst, sd->data, sd->size);
}
// copy timebase while removing common factors
if (outputStream->time_base.num <= 0 || outputStream->time_base.den <= 0) {
outputStream->time_base = av_add_q(encoderContext.timeBase(), (AVRational){0, 1});
}
// copy estimated duration as a hint to the muxer
if (outputStream->duration <= 0 && inputStream->duration > 0) {
outputStream->duration = av_rescale_q(inputStream->duration, inputStream->time_base, outputStream->time_base);
}
streams[i].codecType = encoderContext.getRawCtx()->codec_type;
streams[i].codec = std::move(encoderContext);
streams[i].streamIndex = i;
}
// avio_open() and avformat_write_header()
if ((status = formatContext.writeHeader(fmtOptions)) < 0) {
return status;
}
formatContext.dumpFormat();
</avsampleformat></double></double></avcodecid>Reading from stream.
int InputProcessor::performStep() {
int status;
Packet nextPacket;
if ((status = input->getFormatContext().readFrame(nextPacket)) < 0) {
return status;
}
++streams[nextPacket.getStreamIndex()].readPackets;
int streamIndex = nextPacket.getStreamIndex();
CodecContext &decoder = input->getDecoderAtIndex(streamIndex);
AVStream *inputStream = input->getStreamAtIndex(streamIndex);
if (streams[nextPacket.getStreamIndex()].readPackets == 1) {
for (int i = 0; i < inputStream->nb_side_data; ++i) {
AVPacketSideData *src_sd = &inputStream->side_data[i];
uint8_t *dst_data;
if (src_sd->type == AV_PKT_DATA_DISPLAYMATRIX) {
continue;
}
if (av_packet_get_side_data(nextPacket.getRawPtr(), src_sd->type, nullptr)) {
continue;
}
dst_data = av_packet_new_side_data(nextPacket.getRawPtr(), src_sd->type, src_sd->size);
if (!dst_data) {
return AVERROR(ENOMEM);
}
memcpy(dst_data, src_sd->data, src_sd->size);
}
}
nextPacket.rescaleTimestamps(inputStream->time_base, decoder.timeBase());
status = decodePacket(&nextPacket, nextPacket.getStreamIndex());
if (status < 0 && status != AVERROR(EAGAIN)) {
return status;
}
return 0;
}Here is decoding/encoding code.
int InputProcessor::decodePacket(Packet *packet, int streamIndex) {
int status;
int sendStatus;
auto &decoder = input->getDecoderAtIndex(streamIndex);
do {
if (packet == nullptr) {
sendStatus = decoder.flushDecodedFrames();
} else {
sendStatus = decoder.sendPacket(*packet);
}
if (sendStatus < 0 && sendStatus != AVERROR(EAGAIN) && sendStatus != AVERROR_EOF) {
return sendStatus;
}
if (sendStatus == 0 && packet) {
++streams[streamIndex].decodedPackets;
}
Frame decodedFrame;
while (true) {
if ((status = decoder.receiveFrame(decodedFrame)) < 0) {
break;
}
++streams[streamIndex].decodedFrames;
if ((status = filterAndWriteFrame(&decodedFrame, streamIndex)) < 0) {
break;
}
decodedFrame.unref();
}
} while (sendStatus == AVERROR(EAGAIN));
return status;
}
int InputProcessor::encodeAndWriteFrame(Frame *frame, int streamIndex) {
assert(input->isValid());
assert(formatContext);
int status = 0;
int sendStatus;
Packet packet;
CodecContext &encoderContext = streams[streamIndex].codec;
do {
if (frame) {
sendStatus = encoderContext.sendFrame(*frame);
} else {
sendStatus = encoderContext.flushEncodedPackets();
}
if (sendStatus < 0 && sendStatus != AVERROR(EAGAIN) && sendStatus != AVERROR_EOF) {
return status;
}
if (sendStatus == 0 && frame) {
++streams[streamIndex].encodedFrames;
}
while (true) {
if ((status = encoderContext.receivePacket(packet)) < 0) {
break;
}
++streams[streamIndex].encodedPackets;
packet.setStreamIndex(streamIndex);
auto sourceTimebase = encoderContext.timeBase();
auto dstTimebase = formatContext.getStreams()[streamIndex]->time_base;
packet.rescaleTimestamps(sourceTimebase, dstTimebase);
if ((status = formatContext.writeFrameInterleaved(packet)) < 0) {
return status;
}
packet.unref();
}
} while (sendStatus == AVERROR(EAGAIN));
if (status != AVERROR(EAGAIN)) {
return status;
}
return 0;
}FFprobe output for original video.
Input #0, matroska,webm, from 'testvideo':
Metadata:
title : TestVideo
encoder : libebml v1.3.0 + libmatroska v1.4.0
creation_time : 2014-12-23T03:38:05.000000Z
Duration: 00:02:29.25, start: 0.000000, bitrate: 79549 kb/s
Stream #0:0(rus): Video: h264 (High 4:4:4 Predictive), yuv444p10le(pc, bt709, progressive), 2048x858 [SAR 1:1 DAR 1024:429], 24 fps, 24 tbr, 1k tbn, 48 tbc (default)
Stream #0:1(rus): Audio: pcm_s24le, 48000 Hz, 6 channels, s32 (24 bit), 6912 kb/s (default)Transcoded :
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '123.mp4':
Metadata:
major_brand : mp42
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.71.100
Duration: 00:02:29.27, start: 0.000000, bitrate: 4282 kb/s
Stream #0:0(rus): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 192:143 DAR 1024:429], 3940 kb/s, 24.01 fps, 24 tbr, 12288 tbn, 96 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(rus): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 336 kb/s (default)
Metadata:
handler_name : SoundHandler
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