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How can I fix a segmentation fault in a C program ? [duplicate]
31 mars 2023, par ipegasus

Possible Duplicate :

Segmentation fault



Currently I am upgrading an open source program used for HTTP streaming. It needs to support the latest FFmpeg.
The code compiles fine without any warnings, although I am getting a segmentation fault error.


How can I fix the issue ? And / or, what is the best way to debug ? Please find attached a portion of the code due to size. I will try to add the project to GitHub :)


Sample Usage


# segmenter --i out.ts --l 10 --o stream.m3u8 --d segments --f stream


Makefile


FFLIBS=`pkg-config --libs libavformat libavcodec libavutil`
FFFLAGS=`pkg-config --cflags libavformat libavcodec libavutil`

all:
 gcc -Wall -g segmenter.c -o segmenter ${FFFLAGS} ${FFLIBS}


segmenter.c


/*
 * Copyright (c) 2009 Chase Douglas
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
#include 
#include 
#include 
#include 
#include 
#include "libavformat/avformat.h"

#include "libavformat/avio.h"

#include <sys></sys>stat.h>

#include "segmenter.h"
#include "libavformat/avformat.h"

#define IMAGE_ID3_SIZE 9171

void printUsage() {
 fprintf(stderr, "\nExample: segmenter --i infile --d baseDir --f baseFileName --o playListFile.m3u8 --l 10 \n");
 fprintf(stderr, "\nOptions: \n");
 fprintf(stderr, "--i <infile>.\n");
 fprintf(stderr, "--o <outfile>.\n");
 fprintf(stderr, "--d basedir, the base directory for files.\n");
 fprintf(stderr, "--f baseFileName, output files will be baseFileName-#.\n");
 fprintf(stderr, "--l segment length, the length of each segment.\n");
 fprintf(stderr, "--a, audio only decode for < 64k streams.\n");
 fprintf(stderr, "--v, video only decode for < 64k streams.\n");
 fprintf(stderr, "--version, print version details and exit.\n");
 fprintf(stderr, "\n\n");
}

void ffmpeg_version() {
 // output build and version numbers
 fprintf(stderr, " libavutil version: %s\n", AV_STRINGIFY(LIBAVUTIL_VERSION));
 fprintf(stderr, " libavutil build: %d\n", LIBAVUTIL_BUILD);
 fprintf(stderr, " libavcodec version: %s\n", AV_STRINGIFY(LIBAVCODEC_VERSION));
 fprintf(stdout, " libavcodec build: %d\n", LIBAVCODEC_BUILD);
 fprintf(stderr, " libavformat version: %s\n", AV_STRINGIFY(LIBAVFORMAT_VERSION));
 fprintf(stderr, " libavformat build: %d\n", LIBAVFORMAT_BUILD);
 fprintf(stderr, " built on " __DATE__ " " __TIME__);
#ifdef __GNUC__
 fprintf(stderr, ", gcc: " __VERSION__ "\n");
#else
 fprintf(stderr, ", using a non-gcc compiler\n");
#endif
}


static AVStream *add_output_stream(AVFormatContext *output_format_context, AVStream *input_stream) {
 AVCodecContext *input_codec_context;
 AVCodecContext *output_codec_context;
 AVStream *output_stream;

 output_stream = avformat_new_stream(output_format_context, 0);
 if (!output_stream) {
 fprintf(stderr, "Segmenter error: Could not allocate stream\n");
 exit(1);
 }

 input_codec_context = input_stream->codec;
 output_codec_context = output_stream->codec;

 output_codec_context->codec_id = input_codec_context->codec_id;
 output_codec_context->codec_type = input_codec_context->codec_type;
 output_codec_context->codec_tag = input_codec_context->codec_tag;
 output_codec_context->bit_rate = input_codec_context->bit_rate;
 output_codec_context->extradata = input_codec_context->extradata;
 output_codec_context->extradata_size = input_codec_context->extradata_size;

 if (av_q2d(input_codec_context->time_base) * input_codec_context->ticks_per_frame > av_q2d(input_stream->time_base) && av_q2d(input_stream->time_base) < 1.0 / 1000) {
 output_codec_context->time_base = input_codec_context->time_base;
 output_codec_context->time_base.num *= input_codec_context->ticks_per_frame;
 } else {
 output_codec_context->time_base = input_stream->time_base;
 }

 switch (input_codec_context->codec_type) {
#ifdef USE_OLD_FFMPEG
 case CODEC_TYPE_AUDIO:
#else
 case AVMEDIA_TYPE_AUDIO:
#endif
 output_codec_context->channel_layout = input_codec_context->channel_layout;
 output_codec_context->sample_rate = input_codec_context->sample_rate;
 output_codec_context->channels = input_codec_context->channels;
 output_codec_context->frame_size = input_codec_context->frame_size;
 if ((input_codec_context->block_align == 1 && input_codec_context->codec_id == CODEC_ID_MP3) || input_codec_context->codec_id == CODEC_ID_AC3) {
 output_codec_context->block_align = 0;
 } else {
 output_codec_context->block_align = input_codec_context->block_align;
 }
 break;
#ifdef USE_OLD_FFMPEG
 case CODEC_TYPE_VIDEO:
#else
 case AVMEDIA_TYPE_VIDEO:
#endif
 output_codec_context->pix_fmt = input_codec_context->pix_fmt;
 output_codec_context->width = input_codec_context->width;
 output_codec_context->height = input_codec_context->height;
 output_codec_context->has_b_frames = input_codec_context->has_b_frames;

 if (output_format_context->oformat->flags & AVFMT_GLOBALHEADER) {
 output_codec_context->flags |= CODEC_FLAG_GLOBAL_HEADER;
 }
 break;
 default:
 break;
 }

 return output_stream;
}

int write_index_file(const char index[], const char tmp_index[], const unsigned int planned_segment_duration, const unsigned int actual_segment_duration[],
 const char output_directory[], const char output_prefix[], const char output_file_extension[],
 const unsigned int first_segment, const unsigned int last_segment) {
 FILE *index_fp;
 char *write_buf;
 unsigned int i;

 index_fp = fopen(tmp_index, "w");
 if (!index_fp) {
 fprintf(stderr, "Could not open temporary m3u8 index file (%s), no index file will be created\n", tmp_index);
 return -1;
 }

 write_buf = malloc(sizeof (char) * 1024);
 if (!write_buf) {
 fprintf(stderr, "Could not allocate write buffer for index file, index file will be invalid\n");
 fclose(index_fp);
 return -1;
 }

 unsigned int maxDuration = planned_segment_duration;

 for (i = first_segment; i <= last_segment; i++)
 if (actual_segment_duration[i] > maxDuration)
 maxDuration = actual_segment_duration[i];



 snprintf(write_buf, 1024, "#EXTM3U\n#EXT-X-TARGETDURATION:%u\n", maxDuration);

 if (fwrite(write_buf, strlen(write_buf), 1, index_fp) != 1) {
 fprintf(stderr, "Could not write to m3u8 index file, will not continue writing to index file\n");
 free(write_buf);
 fclose(index_fp);
 return -1;
 }

 for (i = first_segment; i <= last_segment; i++) {
 snprintf(write_buf, 1024, "#EXTINF:%u,\n%s-%u%s\n", actual_segment_duration[i], output_prefix, i, output_file_extension);
 if (fwrite(write_buf, strlen(write_buf), 1, index_fp) != 1) {
 fprintf(stderr, "Could not write to m3u8 index file, will not continue writing to index file\n");
 free(write_buf);
 fclose(index_fp);
 return -1;
 }
 }

 snprintf(write_buf, 1024, "#EXT-X-ENDLIST\n");
 if (fwrite(write_buf, strlen(write_buf), 1, index_fp) != 1) {
 fprintf(stderr, "Could not write last file and endlist tag to m3u8 index file\n");
 free(write_buf);
 fclose(index_fp);
 return -1;
 }

 free(write_buf);
 fclose(index_fp);

 return rename(tmp_index, index);
}

int main(int argc, const char *argv[]) {
 //input parameters
 char inputFilename[MAX_FILENAME_LENGTH], playlistFilename[MAX_FILENAME_LENGTH], baseDirName[MAX_FILENAME_LENGTH], baseFileName[MAX_FILENAME_LENGTH];
 char baseFileExtension[5]; //either "ts", "aac" or "mp3"
 int segmentLength, outputStreams, verbosity, version;



 char currentOutputFileName[MAX_FILENAME_LENGTH];
 char tempPlaylistName[MAX_FILENAME_LENGTH];


 //these are used to determine the exact length of the current segment
 double prev_segment_time = 0;
 double segment_time;
 unsigned int actual_segment_durations[2048];
 double packet_time = 0;

 //new variables to keep track of output size
 double output_bytes = 0;

 unsigned int output_index = 1;
 AVOutputFormat *ofmt;
 AVFormatContext *ic = NULL;
 AVFormatContext *oc;
 AVStream *video_st = NULL;
 AVStream *audio_st = NULL;
 AVCodec *codec;
 int video_index;
 int audio_index;
 unsigned int first_segment = 1;
 unsigned int last_segment = 0;
 int write_index = 1;
 int decode_done;
 int ret;
 int i;

 unsigned char id3_tag[128];
 unsigned char * image_id3_tag;

 size_t id3_tag_size = 73;
 int newFile = 1; //a boolean value to flag when a new file needs id3 tag info in it

 if (parseCommandLine(inputFilename, playlistFilename, baseDirName, baseFileName, baseFileExtension, &outputStreams, &segmentLength, &verbosity, &version, argc, argv) != 0)
 return 0;

 if (version) {
 ffmpeg_version();
 return 0;
 }


 fprintf(stderr, "%s %s\n", playlistFilename, tempPlaylistName);


 image_id3_tag = malloc(IMAGE_ID3_SIZE);
 if (outputStreams == OUTPUT_STREAM_AUDIO)
 build_image_id3_tag(image_id3_tag);
 build_id3_tag((char *) id3_tag, id3_tag_size);

 snprintf(tempPlaylistName, strlen(playlistFilename) + strlen(baseDirName) + 1, "%s%s", baseDirName, playlistFilename);
 strncpy(playlistFilename, tempPlaylistName, strlen(tempPlaylistName));
 strncpy(tempPlaylistName, playlistFilename, MAX_FILENAME_LENGTH);
 strncat(tempPlaylistName, ".", 1);

 //decide if this is an aac file or a mpegts file.
 //postpone deciding format until later
 /* ifmt = av_find_input_format("mpegts");
 if (!ifmt)
 {
 fprintf(stderr, "Could not find MPEG-TS demuxer.\n");
 exit(1);
 } */

 av_log_set_level(AV_LOG_DEBUG);

 av_register_all();
 ret = avformat_open_input(&ic, inputFilename, NULL, NULL);
 if (ret != 0) {
 fprintf(stderr, "Could not open input file %s. Error %d.\n", inputFilename, ret);
 exit(1);
 }

 if (avformat_find_stream_info(ic, NULL) < 0) {
 fprintf(stderr, "Could not read stream information.\n");
 exit(1);
 }

 oc = avformat_alloc_context();
 if (!oc) {
 fprintf(stderr, "Could not allocate output context.");
 exit(1);
 }

 video_index = -1;
 audio_index = -1;

 for (i = 0; i < ic->nb_streams && (video_index < 0 || audio_index < 0); i++) {
 switch (ic->streams[i]->codec->codec_type) {

#ifdef USE_OLD_FFMPEG
 case CODEC_TYPE_VIDEO:
#else
 case AVMEDIA_TYPE_VIDEO:
#endif
 video_index = i;
 ic->streams[i]->discard = AVDISCARD_NONE;
 if (outputStreams & OUTPUT_STREAM_VIDEO)
 video_st = add_output_stream(oc, ic->streams[i]);
 break;
#ifdef USE_OLD_FFMPEG
 case CODEC_TYPE_AUDIO:
#else
 case AVMEDIA_TYPE_AUDIO:
#endif
 audio_index = i;
 ic->streams[i]->discard = AVDISCARD_NONE;
 if (outputStreams & OUTPUT_STREAM_AUDIO)
 audio_st = add_output_stream(oc, ic->streams[i]);
 break;
 default:
 ic->streams[i]->discard = AVDISCARD_ALL;
 break;
 }
 }

 if (video_index == -1) {
 fprintf(stderr, "Stream must have video component.\n");
 exit(1);
 }

 //now that we know the audio and video output streams
 //we can decide on an output format.
 if (outputStreams == OUTPUT_STREAM_AUDIO) {
 //the audio output format should be the same as the audio input format
 switch (ic->streams[audio_index]->codec->codec_id) {
 case CODEC_ID_MP3:
 fprintf(stderr, "Setting output audio to mp3.");
 strncpy(baseFileExtension, ".mp3", strlen(".mp3"));
 ofmt = av_guess_format("mp3", NULL, NULL);
 break;
 case CODEC_ID_AAC:
 fprintf(stderr, "Setting output audio to aac.");
 ofmt = av_guess_format("adts", NULL, NULL);
 break;
 default:
 fprintf(stderr, "Codec id %d not supported.\n", ic->streams[audio_index]->id);
 }
 if (!ofmt) {
 fprintf(stderr, "Could not find audio muxer.\n");
 exit(1);
 }
 } else {
 ofmt = av_guess_format("mpegts", NULL, NULL);
 if (!ofmt) {
 fprintf(stderr, "Could not find MPEG-TS muxer.\n");
 exit(1);
 }
 }
 oc->oformat = ofmt;

 if (outputStreams & OUTPUT_STREAM_VIDEO && oc->oformat->flags & AVFMT_GLOBALHEADER) {
 oc->flags |= CODEC_FLAG_GLOBAL_HEADER;
 }


 /* Deprecated: pass the options to avformat_write_header directly.
 if (av_set_parameters(oc, NULL) < 0) {
 fprintf(stderr, "Invalid output format parameters.\n");
 exit(1);
 }
 */

 av_dump_format(oc, 0, baseFileName, 1);


 //open the video codec only if there is video data
 if (video_index != -1) {
 if (outputStreams & OUTPUT_STREAM_VIDEO)
 codec = avcodec_find_decoder(video_st->codec->codec_id);
 else
 codec = avcodec_find_decoder(ic->streams[video_index]->codec->codec_id);
 if (!codec) {
 fprintf(stderr, "Could not find video decoder, key frames will not be honored.\n");
 }

 if (outputStreams & OUTPUT_STREAM_VIDEO)
 ret = avcodec_open2(video_st->codec, codec, NULL);
 else
 avcodec_open2(ic->streams[video_index]->codec, codec, NULL);
 if (ret < 0) {
 fprintf(stderr, "Could not open video decoder, key frames will not be honored.\n");
 }
 }

 snprintf(currentOutputFileName, strlen(baseDirName) + strlen(baseFileName) + strlen(baseFileExtension) + 10, "%s%s-%u%s", baseDirName, baseFileName, output_index++, baseFileExtension);

 if (avio_open(&oc->pb, currentOutputFileName, URL_WRONLY) < 0) {
 fprintf(stderr, "Could not open '%s'.\n", currentOutputFileName);
 exit(1);
 }
 newFile = 1;

 int r = avformat_write_header(oc,NULL);
 if (r) {
 fprintf(stderr, "Could not write mpegts header to first output file.\n");
 debugReturnCode(r);
 exit(1);
 }

 //no segment info is written here. This just creates the shell of the playlist file
 write_index = !write_index_file(playlistFilename, tempPlaylistName, segmentLength, actual_segment_durations, baseDirName, baseFileName, baseFileExtension, first_segment, last_segment);

 do {
 AVPacket packet;

 decode_done = av_read_frame(ic, &packet);

 if (decode_done < 0) {
 break;
 }

 if (av_dup_packet(&packet) < 0) {
 fprintf(stderr, "Could not duplicate packet.");
 av_free_packet(&packet);
 break;
 }

 //this time is used to check for a break in the segments
 // if (packet.stream_index == video_index && (packet.flags & PKT_FLAG_KEY))
 // {
 // segment_time = (double)video_st->pts.val * video_st->time_base.num / video_st->time_base.den;
 // }
#if USE_OLD_FFMPEG
 if (packet.stream_index == video_index && (packet.flags & PKT_FLAG_KEY))
#else
 if (packet.stream_index == video_index && (packet.flags & AV_PKT_FLAG_KEY))
#endif
 {
 segment_time = (double) packet.pts * ic->streams[video_index]->time_base.num / ic->streams[video_index]->time_base.den;
 }
 // else if (video_index < 0)
 // {
 // segment_time = (double)audio_st->pts.val * audio_st->time_base.num / audio_st->time_base.den;
 // }

 //get the most recent packet time
 //this time is used when the time for the final segment is printed. It may not be on the edge of
 //of a keyframe!
 if (packet.stream_index == video_index)
 packet_time = (double) packet.pts * ic->streams[video_index]->time_base.num / ic->streams[video_index]->time_base.den; //(double)video_st->pts.val * video_st->time_base.num / video_st->time_base.den;
 else if (outputStreams & OUTPUT_STREAM_AUDIO)
 packet_time = (double) audio_st->pts.val * audio_st->time_base.num / audio_st->time_base.den;
 else
 continue;
 //start looking for segment splits for videos one half second before segment duration expires. This is because the
 //segments are split on key frames so we cannot expect all segments to be split exactly equally.
 if (segment_time - prev_segment_time >= segmentLength - 0.5) {
 fprintf(stderr, "looking to print index file at time %lf\n", segment_time);
 avio_flush(oc->pb);
 avio_close(oc->pb);

 if (write_index) {
 actual_segment_durations[++last_segment] = (unsigned int) rint(segment_time - prev_segment_time);
 write_index = !write_index_file(playlistFilename, tempPlaylistName, segmentLength, actual_segment_durations, baseDirName, baseFileName, baseFileExtension, first_segment, last_segment);
 fprintf(stderr, "Writing index file at time %lf\n", packet_time);
 }

 struct stat st;
 stat(currentOutputFileName, &st);
 output_bytes += st.st_size;

 snprintf(currentOutputFileName, strlen(baseDirName) + strlen(baseFileName) + strlen(baseFileExtension) + 10, "%s%s-%u%s", baseDirName, baseFileName, output_index++, baseFileExtension);
 if (avio_open(&oc->pb, currentOutputFileName, URL_WRONLY) < 0) {
 fprintf(stderr, "Could not open '%s'\n", currentOutputFileName);
 break;
 }

 newFile = 1;
 prev_segment_time = segment_time;
 }

 if (outputStreams == OUTPUT_STREAM_AUDIO && packet.stream_index == audio_index) {
 if (newFile && outputStreams == OUTPUT_STREAM_AUDIO) {
 //add id3 tag info
 //fprintf(stderr, "adding id3tag to file %s\n", currentOutputFileName);
 //printf("%lf %lld %lld %lld %lld %lld %lf\n", segment_time, audio_st->pts.val, audio_st->cur_dts, audio_st->cur_pkt.pts, packet.pts, packet.dts, packet.dts * av_q2d(ic->streams[audio_index]->time_base) );
 fill_id3_tag((char*) id3_tag, id3_tag_size, packet.dts);
 avio_write(oc->pb, id3_tag, id3_tag_size);
 avio_write(oc->pb, image_id3_tag, IMAGE_ID3_SIZE);
 avio_flush(oc->pb);
 newFile = 0;
 }

 packet.stream_index = 0; //only one stream in audio only segments
 ret = av_interleaved_write_frame(oc, &packet);
 } else if (outputStreams & OUTPUT_STREAM_VIDEO) {
 if (newFile) {
 //fprintf(stderr, "New File: %lld %lld %lld\n", packet.pts, video_st->pts.val, audio_st->pts.val);
 //printf("%lf %lld %lld %lld %lld %lld %lf\n", segment_time, audio_st->pts.val, audio_st->cur_dts, audio_st->cur_pkt.pts, packet.pts, packet.dts, packet.dts * av_q2d(ic->streams[audio_index]->time_base) );
 newFile = 0;
 }
 if (outputStreams == OUTPUT_STREAM_VIDEO)
 ret = av_write_frame(oc, &packet);
 else
 ret = av_interleaved_write_frame(oc, &packet);
 }

 if (ret < 0) {
 fprintf(stderr, "Warning: Could not write frame of stream.\n");
 } else if (ret > 0) {
 fprintf(stderr, "End of stream requested.\n");
 av_free_packet(&packet);
 break;
 }

 av_free_packet(&packet);
 } while (!decode_done);

 //make sure all packets are written and then close the last file.
 avio_flush(oc->pb);
 av_write_trailer(oc);

 if (video_st && video_st->codec)
 avcodec_close(video_st->codec);

 if (audio_st && audio_st->codec)
 avcodec_close(audio_st->codec);

 for (i = 0; i < oc->nb_streams; i++) {
 av_freep(&oc->streams[i]->codec);
 av_freep(&oc->streams[i]);
 }

 avio_close(oc->pb);
 av_free(oc);

 struct stat st;
 stat(currentOutputFileName, &st);
 output_bytes += st.st_size;


 if (write_index) {
 actual_segment_durations[++last_segment] = (unsigned int) rint(packet_time - prev_segment_time);

 //make sure that the last segment length is not zero
 if (actual_segment_durations[last_segment] == 0)
 actual_segment_durations[last_segment] = 1;

 write_index_file(playlistFilename, tempPlaylistName, segmentLength, actual_segment_durations, baseDirName, baseFileName, baseFileExtension, first_segment, last_segment);

 }

 write_stream_size_file(baseDirName, baseFileName, output_bytes * 8 / segment_time);

 return 0;
}
</outfile></infile>

-
Why does every encoded frame's size increase after I had use to set one frame to be key in intel qsv of ffmpeg
22 avril 2021, par TONYI used intel's qsv to encode h264 video in ffmpeg. My av codec context settings is like as below :


m_ctx->width = m_width;
 m_ctx->height = m_height;
 m_ctx->time_base = { 1, (int)fps };
 m_ctx->qmin = 10;
 m_ctx->qmax = 35;
 m_ctx->gop_size = 3000;
 m_ctx->max_b_frames = 0;
 m_ctx->has_b_frames = false;
 m_ctx->refs = 2;
 m_ctx->slices = 0;
 m_ctx->codec_id = m_encoder->id;
 m_ctx->codec_type = AVMEDIA_TYPE_VIDEO;
 m_ctx->pix_fmt = m_h264InputFormat;
 m_ctx->compression_level = 4;
 m_ctx->flags &= ~AV_CODEC_FLAG_CLOSED_GOP;
 AVDictionary *param = nullptr;
 av_dict_set(&param, "idr_interval", "0", 0);
 av_dict_set(&param, "async_depth", "1", 0);
 av_dict_set(&param, "forced_idr", "1", 0);


and in the encoding, I set the AVFrame to be AV_PICTURE_TYPE_I when key frame is needed :


if(key_frame){
 encodeFrame->pict_type = AV_PICTURE_TYPE_I;
 }else{
 encodeFrame->pict_type = AV_PICTURE_TYPE_NONE;
 }
 avcodec_send_frame(m_ctx, encodeFrame);
 avcodec_receive_packet(m_ctx, m_packet);
 std::cerr<<"packet size is "<size<<",is key frame "<code>

The strange phenomenon is that if I had set one frame to AV_PICTURE_TYPE_I, then every encoded frame's size after the key frame would increase. If I change the h264 encoder to x264, then it's ok.


The packet size is as below before I call "encodeFrame->pict_type = AV_PICTURE_TYPE_I" :


packet size is 26839
packet size is 2766
packet size is 2794
packet size is 2193
packet size is 1820
packet size is 2542
packet size is 2024
packet size is 1692
packet size is 2095
packet size is 2550
packet size is 1685
packet size is 1800
packet size is 2276
packet size is 1813
packet size is 2206
packet size is 2745
packet size is 2334
packet size is 2623
packet size is 2055


If I call "encodeFrame->pict_type = AV_PICTURE_TYPE_I", then the packet size is as below :


packet size is 23720,is key frame 1
packet size is 23771,is key frame 0
packet size is 23738,is key frame 0
packet size is 23752,is key frame 0
packet size is 23771,is key frame 0
packet size is 23763,is key frame 0
packet size is 23715,is key frame 0
packet size is 23686,is key frame 0
packet size is 23829,is key frame 0
packet size is 23774,is key frame 0
packet size is 23850,is key frame 0


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Introducing Updates to the Funnels Feature
29 mai 2024, par ErinWe’ve made improvements to the Funnels feature to be more user-friendly and offer you greater flexibility.
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window.playMatomoVideo("FunnelsProductUpdate2024", "#FunnelsProductUpdate2024")<br />
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</script>Here’s what’s changing :
Setting up and managing funnels is now easier than ever
Previously, creating funnels was tedious and required going through the Goals feature. But we’ve changed that with the introduction of a separate page to configure funnels.
Create funnels with greater flexibility—no longer tied to goals
Funnels is now a standalone feature, providing you with more flexibility. Before, you could only create a funnel if it was tied to a goal, in other words, the final step in the funnel had to be a goal. What’s more, you also couldn’t use goals for steps in the funnel.
Previous configuration requirements of Funnels Now, funnels are independent of goals, and goals can serve as steps within the funnel. This means you have the freedom to configure any combination of steps in a funnel :
- All steps can be goals
- No steps need to be goals
- Or some steps can be goals, some steps can be events
No matter what your customer journey looks like, funnels now offer the versatility to meet your business’s specific needs.
Find friction points faster with intuitive visuals
One of the most significant improvements is the visual upgrade of the Funnels feature. The new Funnels graph is now visually in line with industry standards and intuitive.
The new visual provides a clearer view of your drop-off and conversion rates so you can instantly find points of friction in your funnel to improve the user experience and overall conversion rate.
This visualisation also provides a detailed overview of the number of visitors who enter, exit, skip, or proceed at each step of your funnel by using different coloured bars for visual clarity on each step’s performance.
With this update, we’ve also replaced ‘backfilled visits’ with ‘skipped steps’ to avoid misinterpretation of the data.
New data table for more granular insights
Accompanying this visual improvement is a new data table, allowing for more granular insights, segment comparison, and easy data export.
We’ve also increased Funnel analysis limits. You can now compare funnel data for 2 date periods and 6 segments (up to 12 compared datasets in total).
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