Newest 'ffmpeg' Questions - Stack Overflow
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a simple example of ffmpeg compiled by ndk
13 janvier 2012, par user1074474I am trying to build bampuser taken from http://bambuser.com/opensource by android ndk but its always giving an exception. I am using android sdk on eclipse and running it on Windows OS. I also tried to compile ffmpeg this way but no success yet . my target is to get the ffmpeg compile and use it in my adroid project. I followed all the instruction here http://www.roman10.net/how-to-build-ffmpeg-for-android/ but it seems it needs unix to build it, can I use any special ndk command to run build from a particular file ?because from ffmpeg source code I need to run a specific command other then its usual makefile
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Unable to execute CLI commands through PHP
13 janvier 2012, par user940154OS: ubuntu 11.10 Webserver: Apache Code: PHP I am trying to display the output of command "ffmpeg -i " on the webpage using php. Required: The webpage should show the information about video (text). Whats happening: The webpage shows no text output on running the php code. If I was however doing system("ls") the code runs fine and outputs the list of files. Here's my code
<?php echo "Details of video file:"; system('ffmpeg -i /home/atish/Videos/T2V0040006_Angled_ride_720x576i_FLDCMB.avi'); ?>The same command works fine on my shell, and my system has ffmpeg installed. Here's a snapshot of executing this command directly on shell:
ThinkPad-T420:~/Videos$ ffmpeg -i /home/xx/Videos/T2V0040006_Angled_ride_720x576i_FLDCMB.avi ffmpeg version git-2012-01-10-7e2ba2d Copyright (c) 2000-2012 the FFmpeg developers built on Jan 10 2012 12:01:19 with gcc 4.6.1 configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore- amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-nonfree --enable-postproc --enable-version3 --enable-x11grab libavutil 51. 34.100 / 51. 34.100 libavcodec 53. 54.100 / 53. 54.100 libavformat 53. 29.100 / 53. 29.100 libavdevice 53. 4.100 / 53. 4.100 libavfilter 2. 58.100 / 2. 58.100 libswscale 2. 1.100 / 2. 1.100 libswresample 0. 6.100 / 0. 6.100 libpostproc 51. 2.100 / 51. 2.100 Input #0, avi, from '/home/atish/Videos/T2V0040006_Angled_ride_720x576i_FLDCMB.avi': Metadata: encoder : Lavf52.23.1 Duration: 00:00:29.00, start: 0.000000, bitrate: 124422 kb/s Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 720x576, 25 tbr, 25 tbn, 25 tbc At least one output file must be specifiedI have tried appending "DISPLAY=:0" to my command and also done "xhost +" before running php code, but nothing is helping me out.
Thanks.
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How to fix a segmentaion fault in a C program ? [closed]
13 janvier 2012, par ipegasusPossible Duplicate:
Segmentation faultCurrently I am upgrading an open source program used for HTTP streaming. It needs to support the latest FFMPEG. The code compiles fine with no warnings although I am getting a segmentation fault error. I would like to know how to fix the issue? and / or 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 :) Thanks in advance!
Sample Usage
# segmenter --i out.ts --l 10 --o stream.m3u8 --d segments --f streamMakefile
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" #includestat.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 .\n"); fprintf(stderr, "--o .\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; } -
Grab frame without downloading whole file ?
12 janvier 2012, par WritecoderIs this possible using php + ffmpeg?
ffmpeg-php has the ability to:
Ability to grab frames from movie files and return them as images that can be manipulated using PHP's built-in image functions. This is great for automatically creating thumbnails for movie files.
I just don't want to download the whole file before doing so. So lets say i want to grab a frame @ 10% of the movie:
First lets get the size of remote file:
$ch = curl_init(); curl_setopt($ch, CURLOPT_HEADER, true); curl_setopt($ch, CURLOPT_NOBODY, true); curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); curl_setopt($ch, CURLOPT_URL, $url); //specify the url curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE); $head = curl_exec($ch); $size = curl_getinfo($ch,CURLINFO_CONTENT_LENGTH_DOWNLOAD);Then it's quite easy to download only 10% of the .flv or .mov file using curl.
But the framegrab trick using ffmpeg-php probably won't work because the file probably is corrupted?
Any other ideas?
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Requesting header information of a file
11 janvier 2012, par 0v3rrid3is there anyway I can request only the header information of any media. For example I just want to request header information of any video file so as to find its video length. I tried using
ffmpeg -i {video_url}and did the work but I noticed that it actually downloads the given media in local storage and returns back the header information which obviously increases roundtrip time.So I would really appreciate if there is any idea for finding the length of media in a fly. BTW I have a ruby on rails application where I need to implement this.
