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Médias (21)
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1,000,000
27 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Demon Seed
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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The Four of Us are Dying
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Corona Radiata
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Lights in the Sky
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Head Down
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Sur d’autres sites (7200)
-
FFmpeg how to apply "aac_adtstoasc" and "h264_mp4toannexb" bitstream filters to transcode to h.264 with AAC
9 juillet 2015, par larodI’ve been struggling with this issue for about a month, I have studied FFmpeg documentation more specifically transcode_aac.c, transcoding.c, decoding_encoding.c and Handbrake’s implementation which is really dense.
The error that I’m getting is the following :
[mp4 @ 0x11102f800] Malformed AAC bitstream detected: use the audio bitstream filter 'aac_adtstoasc' to fix it ('-bsf:a aac_adtstoasc' option with ffmpeg).The research I’ve done points to a filter that needs to be implemented.
FIX:AAC in some container format (FLV, MP4, MKV etc.) need "aac_adtstoasc" bitstream filter (BSF).I know I can do the following :
AVBitStreamFilterContext* aacbsfc = av_bitstream_filter_init("aac_adtstoasc");And then do something like this :
av_bitstream_filter_filter(aacbsfc, in_stream->codec, NULL, &pkt.data, &pkt.size, pkt.data, pkt.size, 0);What eludes me is when to filter the
AVPacket, is it before callingav_packet_rescale_tsor insideinit_filter. I would greatly appreciate if someone can point me in the right direction. Thanks in advance.// Variables
AVFormatContext *_ifmt_ctx, *_ofmt_ctx;
FilteringContext *_filter_ctx;
AVBitStreamFilterContext *_h264bsfc;
AVBitStreamFilterContext *_aacbsfc;
NSURL *_srcURL, *_dstURL;
- (IBAction)trancode:(id)sender {
NSLog(@"%s %@",__func__, _mediaFile.fsName);
int ret, got_frame;
int (*dec_func)(AVCodecContext *, AVFrame *, int *, const AVPacket *);
unsigned int stream_index, i;
enum AVMediaType type;
AVPacket packet = {.data = NULL, .size = 0};
AVFrame *frame = NULL;
_h264bsfc = av_bitstream_filter_init("h264_mp4toannexb");
_aacbsfc = av_bitstream_filter_init("aac_adtstoasc");
_srcURL = [Utility urlFromBookmark:_mediaFile.bookmark];
if ([_srcURL startAccessingSecurityScopedResource]) {
NSString *newFileName = [[_srcURL.lastPathComponent stringByDeletingPathExtension]stringByAppendingPathExtension:@"mp4"];
_dstURL = [NSURL fileURLWithPath:[[_srcURL URLByDeletingLastPathComponent]URLByAppendingPathComponent:newFileName].path isDirectory:NO];
[AppDelegate ffmpegRegisterAll];
ret = open_input_file(_srcURL.path.fileSystemRepresentation);
if (ret < 0) {
NSLog(@"Error openning input file.");
}
ret = open_output_file(_dstURL.path.fileSystemRepresentation);
if (ret < 0) {
NSLog(@"Error openning output file.");
}
ret = init_filters();
if (ret < 0) {
NSLog(@"Error initializing filters.");
}
AVBitStreamFilterContext *h264bsfc = av_bitstream_filter_init("h264_mp4toannexb");
AVBitStreamFilterContext* aacbsfc = av_bitstream_filter_init("aac_adtstoasc");
// Transcode *******************************************************************************
while (1) {
if ((ret = av_read_frame(_ifmt_ctx, &packet)) < 0) {
break;
}
stream_index = packet.stream_index;
type = _ifmt_ctx->streams[packet.stream_index]->codec->codec_type;
av_log(NULL, AV_LOG_DEBUG, "Demuxer gave frame of stream_index %u\n", stream_index);
if (_filter_ctx[stream_index].filter_graph) {
av_log(NULL, AV_LOG_DEBUG, "Going to reencode&filter the frame\n");
frame = av_frame_alloc();
if (!frame) {
ret = AVERROR(ENOMEM);
break;
}
av_packet_rescale_ts(&packet, _ifmt_ctx->streams[stream_index]->time_base, _ifmt_ctx->streams[stream_index]->codec->time_base);
dec_func = (type == AVMEDIA_TYPE_VIDEO) ? avcodec_decode_video2 : avcodec_decode_audio4;
ret = dec_func(_ifmt_ctx->streams[stream_index]->codec, frame, &got_frame, &packet);
if (ret < 0) {
av_frame_free(&frame);
av_log(NULL, AV_LOG_ERROR, "Decoding failed\n");
break;
}
if (got_frame) {
frame->pts = av_frame_get_best_effort_timestamp(frame);
ret = filter_encode_write_frame(frame, stream_index);
av_frame_free(&frame);
if (ret < 0)
goto end;
} else {
av_frame_free(&frame);
}
} else {
/* remux this frame without reencoding */
av_packet_rescale_ts(&packet,
_ifmt_ctx->streams[stream_index]->time_base,
_ofmt_ctx->streams[stream_index]->time_base);
ret = av_interleaved_write_frame(_ofmt_ctx, &packet);
if (ret < 0)
goto end;
}
av_free_packet(&packet);
}
// *****************************************************************************************
/* flush filters and encoders */
for (i = 0; i < _ifmt_ctx->nb_streams; i++) {
/* flush filter */
if (!_filter_ctx[i].filter_graph)
continue;
ret = filter_encode_write_frame(NULL, i);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Flushing filter failed\n");
goto end;
}
/* flush encoder */
ret = flush_encoder(i);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Flushing encoder failed\n");
goto end;
}
}
av_write_trailer(_ofmt_ctx);
av_bitstream_filter_close(h264bsfc);
av_bitstream_filter_close(aacbsfc);
} else {
NSLog(@"Unable to resolve url for %@",_mediaFile.url.lastPathComponent);
}
[_srcURL stopAccessingSecurityScopedResource];
end:
av_free_packet(&packet);
av_frame_free(&frame);
for (i = 0; i < _ifmt_ctx->nb_streams; i++) {
avcodec_close(_ifmt_ctx->streams[i]->codec);
if (_ofmt_ctx && _ofmt_ctx->nb_streams > i && _ofmt_ctx->streams[i] && _ofmt_ctx->streams[i]->codec)
avcodec_close(_ofmt_ctx->streams[i]->codec);
if (_filter_ctx && _filter_ctx[i].filter_graph)
avfilter_graph_free(&_filter_ctx[i].filter_graph);
}
av_free(_filter_ctx);
avformat_close_input(&_ifmt_ctx);
if (_ofmt_ctx && !(_ofmt_ctx->oformat->flags & AVFMT_NOFILE))
avio_closep(&_ofmt_ctx->pb);
avformat_free_context(_ofmt_ctx);
}The following method is used to open the input file and create the ifmt_ctx.
int open_input_file(const char *filename) {
int ret;
unsigned int i;
_ifmt_ctx = NULL;
if ((ret = avformat_open_input(&_ifmt_ctx, filename, NULL, NULL)) < 0) {
av_log(NULL, AV_LOG_ERROR, "Cannot open input file\n");
return ret;
}
if ((ret = avformat_find_stream_info(_ifmt_ctx, NULL)) < 0) {
av_log(NULL, AV_LOG_ERROR, "Cannot find stream information\n");
return ret;
}
for (i = 0; i < _ifmt_ctx->nb_streams; i++) {
AVStream *stream;
AVCodecContext *codec_ctx;
stream = _ifmt_ctx->streams[i];
codec_ctx = stream->codec;
/* Reencode video & audio and remux subtitles etc. */
if (codec_ctx->codec_type == AVMEDIA_TYPE_VIDEO
|| codec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
/* Open decoder */
ret = avcodec_open2(codec_ctx,
avcodec_find_decoder(codec_ctx->codec_id), NULL);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Failed to open decoder for stream #%u\n", i);
return ret;
}
}
}
// Remove later
av_dump_format(_ifmt_ctx, 0, filename, 0);
return 0;
}This method is used to open the output file and create the output format context.
int open_output_file(const char *filename) {
AVStream *out_stream;
AVStream *in_stream;
AVCodecContext *dec_ctx, *enc_ctx;
AVCodec *encoder;
int ret;
unsigned int i;
_ofmt_ctx = NULL;
avformat_alloc_output_context2(&_ofmt_ctx, NULL, NULL, filename);
if (!_ofmt_ctx) {
av_log(NULL, AV_LOG_ERROR, "Could not create output context\n");
return AVERROR_UNKNOWN;
}
for (i = 0; i < _ifmt_ctx->nb_streams; i++) {
out_stream = avformat_new_stream(_ofmt_ctx, NULL);
if (!out_stream) {
av_log(NULL, AV_LOG_ERROR, "Failed allocating output stream\n");
return AVERROR_UNKNOWN;
}
in_stream = _ifmt_ctx->streams[i];
dec_ctx = in_stream->codec;
enc_ctx = out_stream->codec;
if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) {
// set video stream
encoder = avcodec_find_encoder(AV_CODEC_ID_H264);
avcodec_get_context_defaults3(enc_ctx, encoder);
av_opt_set(enc_ctx->priv_data, "preset", "slow", 0);
enc_ctx->height = dec_ctx->height;
enc_ctx->width = dec_ctx->width;
enc_ctx->bit_rate = dec_ctx->bit_rate;
enc_ctx->time_base = out_stream->time_base = dec_ctx->time_base;
enc_ctx->pix_fmt = encoder->pix_fmts[0];
ret = avcodec_open2(enc_ctx, encoder, NULL);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Cannot open video encoder for stream #%u\n", i);
return ret;
}
} else if (dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
// set audio stream
//encoder = avcodec_find_encoder(AV_CODEC_ID_AAC);
encoder = avcodec_find_encoder_by_name("libfdk_aac");
avcodec_get_context_defaults3(enc_ctx, encoder);
enc_ctx->profile = FF_PROFILE_AAC_HE_V2;
enc_ctx->sample_rate = dec_ctx->sample_rate;
enc_ctx->channel_layout = dec_ctx->channel_layout;
enc_ctx->channels = av_get_channel_layout_nb_channels(enc_ctx->channel_layout);
enc_ctx->sample_fmt = encoder->sample_fmts[0];
enc_ctx->time_base = out_stream->time_base = (AVRational){1, enc_ctx->sample_rate};
enc_ctx->bit_rate = dec_ctx->bit_rate;
ret = avcodec_open2(enc_ctx, encoder, NULL);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Cannot open video encoder for stream #%u\n", i);
return ret;
}
} else if (dec_ctx->codec_type == AVMEDIA_TYPE_UNKNOWN) {
// deal with error
av_log(NULL, AV_LOG_FATAL, "Elementary stream #%d is of unknown type, cannot proceed\n", i);
return AVERROR_INVALIDDATA;
} else {
// remux stream
ret = avcodec_copy_context(_ofmt_ctx->streams[i]->codec,
_ifmt_ctx->streams[i]->codec);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Copying stream context failed\n");
return ret;
}
}
if (_ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER) {
enc_ctx->flags |= CODEC_FLAG_GLOBAL_HEADER;
}
}
av_dump_format(_ofmt_ctx, 0, filename, 1);
NSURL *openFileURL = [Utility openPanelAt:[NSURL URLWithString:_dstURL.URLByDeletingLastPathComponent.path]
withTitle:@"Transcode File"
message:@"Please allow Maví to create the new file."
andPrompt:@"Grant Access"];
openFileURL = [openFileURL URLByAppendingPathComponent:_dstURL.lastPathComponent isDirectory:NO];
if (!(_ofmt_ctx->oformat->flags & AVFMT_NOFILE)) {
ret = avio_open(&_ofmt_ctx->pb, openFileURL.fileSystemRepresentation, AVIO_FLAG_WRITE);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Could not open output file '%s'", filename);
return ret;
}
}
/* init muxer, write output file header */
ret = avformat_write_header(_ofmt_ctx, NULL);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Error occurred when opening output file\n");
return ret;
}
return 0;
}These two methods deal with initialising the filters and filtering.
int init_filters(void) {
const char *filter_spec;
unsigned int i;
int ret;
_filter_ctx = av_malloc_array(_ifmt_ctx->nb_streams, sizeof(*_filter_ctx));
if (!_filter_ctx)
return AVERROR(ENOMEM);
for (i = 0; i < _ifmt_ctx->nb_streams; i++) {
_filter_ctx[i].buffersrc_ctx = NULL;
_filter_ctx[i].buffersink_ctx = NULL;
_filter_ctx[i].filter_graph = NULL;
if (!(_ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO
|| _ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO))
continue;
if (_ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
filter_spec = "null"; /* passthrough (dummy) filter for video */
else
filter_spec = "anull"; /* passthrough (dummy) filter for audio */
ret = init_filter(&_filter_ctx[i], _ifmt_ctx->streams[i]->codec,
_ofmt_ctx->streams[i]->codec, filter_spec);
if (ret)
return ret;
}
return 0;
}
int init_filter(FilteringContext* fctx, AVCodecContext *dec_ctx, AVCodecContext *enc_ctx, const char *filter_spec) {
char args[512];
int ret = 0;
AVFilter *buffersrc = NULL;
AVFilter *buffersink = NULL;
AVFilterContext *buffersrc_ctx = NULL;
AVFilterContext *buffersink_ctx = NULL;
AVFilterInOut *outputs = avfilter_inout_alloc();
AVFilterInOut *inputs = avfilter_inout_alloc();
AVFilterGraph *filter_graph = avfilter_graph_alloc();
if (!outputs || !inputs || !filter_graph) {
ret = AVERROR(ENOMEM);
goto end;
}
if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) {
buffersrc = avfilter_get_by_name("buffer");
buffersink = avfilter_get_by_name("buffersink");
if (!buffersrc || !buffersink) {
av_log(NULL, AV_LOG_ERROR, "filtering source or sink element not found\n");
ret = AVERROR_UNKNOWN;
goto end;
}
snprintf(args, sizeof(args),
"video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d",
dec_ctx->width, dec_ctx->height, dec_ctx->pix_fmt,
dec_ctx->time_base.num, dec_ctx->time_base.den,
dec_ctx->sample_aspect_ratio.num,
dec_ctx->sample_aspect_ratio.den);
ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in",
args, NULL, filter_graph);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Cannot create buffer source\n");
goto end;
}
ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out",
NULL, NULL, filter_graph);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Cannot create buffer sink\n");
goto end;
}
ret = av_opt_set_bin(buffersink_ctx, "pix_fmts",
(uint8_t*)&enc_ctx->pix_fmt, sizeof(enc_ctx->pix_fmt),
AV_OPT_SEARCH_CHILDREN);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Cannot set output pixel format\n");
goto end;
}
} else if (dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
buffersrc = avfilter_get_by_name("abuffer");
buffersink = avfilter_get_by_name("abuffersink");
if (!buffersrc || !buffersink) {
av_log(NULL, AV_LOG_ERROR, "filtering source or sink element not found\n");
ret = AVERROR_UNKNOWN;
goto end;
}
if (!dec_ctx->channel_layout)
dec_ctx->channel_layout =
av_get_default_channel_layout(dec_ctx->channels);
snprintf(args, sizeof(args),
"time_base=%d/%d:sample_rate=%d:sample_fmt=%s:channel_layout=0x%"PRIx64,
dec_ctx->time_base.num, dec_ctx->time_base.den, dec_ctx->sample_rate,
av_get_sample_fmt_name(dec_ctx->sample_fmt),
dec_ctx->channel_layout);
ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in",
args, NULL, filter_graph);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Cannot create audio buffer source\n");
goto end;
}
ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out",
NULL, NULL, filter_graph);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Cannot create audio buffer sink\n");
goto end;
}
ret = av_opt_set_bin(buffersink_ctx, "sample_fmts",
(uint8_t*)&enc_ctx->sample_fmt, sizeof(enc_ctx->sample_fmt),
AV_OPT_SEARCH_CHILDREN);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Cannot set output sample format\n");
goto end;
}
ret = av_opt_set_bin(buffersink_ctx, "channel_layouts",
(uint8_t*)&enc_ctx->channel_layout,
sizeof(enc_ctx->channel_layout), AV_OPT_SEARCH_CHILDREN);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Cannot set output channel layout\n");
goto end;
}
ret = av_opt_set_bin(buffersink_ctx, "sample_rates",
(uint8_t*)&enc_ctx->sample_rate, sizeof(enc_ctx->sample_rate),
AV_OPT_SEARCH_CHILDREN);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Cannot set output sample rate\n");
goto end;
}
} else {
ret = AVERROR_UNKNOWN;
goto end;
}
/* Endpoints for the filter graph. */
outputs->name = av_strdup("in");
outputs->filter_ctx = buffersrc_ctx;
outputs->pad_idx = 0;
outputs->next = NULL;
inputs->name = av_strdup("out");
inputs->filter_ctx = buffersink_ctx;
inputs->pad_idx = 0;
inputs->next = NULL;
if (!outputs->name || !inputs->name) {
ret = AVERROR(ENOMEM);
goto end;
}
if ((ret = avfilter_graph_parse_ptr(filter_graph, filter_spec,
&inputs, &outputs, NULL)) < 0)
goto end;
if ((ret = avfilter_graph_config(filter_graph, NULL)) < 0)
goto end;
/* Fill FilteringContext */
fctx->buffersrc_ctx = buffersrc_ctx;
fctx->buffersink_ctx = buffersink_ctx;
fctx->filter_graph = filter_graph;
end:
avfilter_inout_free(&inputs);
avfilter_inout_free(&outputs);
return ret;
}Finally these two methods take care of writing the frames.
int encode_write_frame(AVFrame *filt_frame, unsigned int stream_index, int *got_frame) {
int ret;
int got_frame_local;
AVPacket enc_pkt;
int (*enc_func)(AVCodecContext *, AVPacket *, const AVFrame *, int *) =
(_ifmt_ctx->streams[stream_index]->codec->codec_type ==
AVMEDIA_TYPE_VIDEO) ? avcodec_encode_video2 : avcodec_encode_audio2;
if (!got_frame)
got_frame = &got_frame_local;
av_log(NULL, AV_LOG_INFO, "Encoding frame\n");
/* encode filtered frame */
enc_pkt.data = NULL;
enc_pkt.size = 0;
av_init_packet(&enc_pkt);
ret = enc_func(_ofmt_ctx->streams[stream_index]->codec, &enc_pkt,
filt_frame, got_frame);
av_frame_free(&filt_frame);
if (ret < 0)
return ret;
if (!(*got_frame))
return 0;
/* prepare packet for muxing */
enc_pkt.stream_index = stream_index;
av_packet_rescale_ts(&enc_pkt,
_ofmt_ctx->streams[stream_index]->codec->time_base,
_ofmt_ctx->streams[stream_index]->time_base);
av_log(NULL, AV_LOG_DEBUG, "Muxing frame\n");
/* mux encoded frame */
ret = av_interleaved_write_frame(_ofmt_ctx, &enc_pkt);
return ret;
}
int filter_encode_write_frame(AVFrame *frame, unsigned int stream_index)
{
int ret;
AVFrame *filt_frame;
av_log(NULL, AV_LOG_INFO, "Pushing decoded frame to filters\n");
/* push the decoded frame into the filtergraph */
ret = av_buffersrc_add_frame_flags(_filter_ctx[stream_index].buffersrc_ctx,
frame, 0);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Error while feeding the filtergraph\n");
return ret;
}
/* pull filtered frames from the filtergraph */
while (1) {
filt_frame = av_frame_alloc();
if (!filt_frame) {
ret = AVERROR(ENOMEM);
break;
}
av_log(NULL, AV_LOG_INFO, "Pulling filtered frame from filters\n");
ret = av_buffersink_get_frame(_filter_ctx[stream_index].buffersink_ctx,
filt_frame);
if (ret < 0) {
/* if no more frames for output - returns AVERROR(EAGAIN)
* if flushed and no more frames for output - returns AVERROR_EOF
* rewrite retcode to 0 to show it as normal procedure completion
*/
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
ret = 0;
av_frame_free(&filt_frame);
break;
}
filt_frame->pict_type = AV_PICTURE_TYPE_NONE;
ret = encode_write_frame(filt_frame, stream_index, NULL);
if (ret < 0)
break;
}
return ret;
} -
Revert "avformat/dashenc : Disable writing CODECS tag for HEVC streams"
7 juin 2021, par Valerii ZapodovnikovRevert "avformat/dashenc : Disable writing CODECS tag for HEVC streams"
This reverts commit d6d407d2d758b404af0ce6a8ff46bf164db020a1.
Hack not needed after a2b1dd0ce301450a47c972745a6b33c4c273aa5d.
Will fix #7480 and #8904.
This will include e.g. CODECS="hvc1.2.4.L123.B0" into m3u8.Signed-off-by : Valerii Zapodovnikov <val.zapod.vz@gmail.com>
-
doc : Mention -dn in the "Stream selection" paragraph.
27 septembre 2016, par Carl Eugen Hoyos
Syndiquer tout le site
