Newest 'ffmpeg' Questions - Stack Overflow
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using ffmpeg in Azure function to cut files using c#
24 mars 2017, par abhishekmoondra1989I have written an Azure function in C# which will cut a big mp4 files into some small duration. I have copied everything that is required (ffmpeg executeable, video file) in home directory via KUDU console. But when I run the the function it runs for more than 5 minutes and it doesn't give any files in the home directory.
Function :
using System; using System.Diagnostics; public static void Run(string input, TraceWriter log) { log.Info("Executing"); using (var process = new Process()) { process.StartInfo.FileName = @"D:\home\ffmpeg.exe"; process.StartInfo.Arguments = @"-i D:\home\AmnestyInternational.mp4 -ss 00:00:03 -t 00:00:08 -async 1 D:\home\cut.mp4"; process.StartInfo.UseShellExecute = false; process.StartInfo.RedirectStandardOutput = true; process.StartInfo.RedirectStandardError = true; log.Info(Directory.GetCurrentDirectory()); log.Info("Cutting starts:"+DateTime.Now.ToString("h:mm:ss tt")); process.Start(); string output = process.StandardOutput.ReadToEnd(); process.WaitForExit(); log.Info("Cutting ends :"+DateTime.Now.ToString("h:mm:ss tt")); log.Info(output); } }Output seen on Azure function Console:
2017-03-24T11:06:00.705 Function started (Id=df082f54-719a-415f-b7f1-b10548a213be) 2017-03-24T11:06:00.721 Executing 2017-03-24T11:06:00.721 D:\Windows\system32 2017-03-24T11:06:00.721 Cutting start :11:06:00 AM 2017-03-24T11:07:14 No new trace in the past 1 min(s). 2017-03-24T11:08:14 No new trace in the past 2 min(s). 2017-03-24T11:09:14 No new trace in the past 3 min(s). 2017-03-24T11:10:14 No new trace in the past 4 min(s). 2017-03-24T11:11:00.758 Microsoft.Azure.WebJobs.Host: Timeout value of 00:05:00 was exceeded by function: Functions.ManualTriggerCSharp1.When I try to execute this same command on KUDU console or my own PC it only take 1.5 mins and I get a file of the desired duration
Could anyone please help me with this? What I might be missing?
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Check if a video file has subtitles
24 mars 2017, par TRSIs it possible to check if a video file has a subtitle using bash and get a simple answer like "yes" or "no". I don't need to know any details about the subtitles.
Maybe using ffmpeg?
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Reading h264 stream in Python
24 mars 2017, par verified.humanI am trying to read a video stream from a Parrot Bebop 2 drone. The video stream is written as "socket" to a file as H264 stream.
$ ffmpeg -i [STREAM] Input #0, h264, from 'stream_h264': Duration: N/A, bitrate: N/A Stream #0:0: Video: h264 (Constrained Baseline), 1 reference frame, yuv420p(progressive, left), 1280x720, 23.98 fps, 23.98 tbr, 1200k tbn, 47.95 tbcReading the video stream in MPlayer is not a problem using the parameters below. Playing it using VLC or ffmpeg should also not be too hard. For MPlayer the following works:
mplayer -fs -demuxer h264es -benchmark stream_h264This plays the stream in high-res. However my goal is to perform image processing on the frames using Python (mostly OpenCV). Therefore, I would like to read the frames into NumPy arrays. I have already considered using
cv2.VideoCapturebut this does not seem to work for my stream. Other (somewhat easy) to use options I am not aware of, therefore my question is whether someone recommend me how to read the video frames in Python?All recommendations are more than welcome!
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Cant link against ffmpeg static build
24 mars 2017, par David BarishevI have build ffmpeg libraries statically for x86 android using a custom configuration.Now i wanted to add them in my android project.
Im using ffmpeg 3.2.git, android studio 2.3.
I created a folder named distribution which had my binaries, and the minimum headers i needed for it to not tell me about missing header (Except for the avutil- i just included them all), located the root of my project.
Here is a file tree:distribution ├── libavcodec │ ├── lib │ │ └── x86 │ │ └── libavcodec.a │ ├── avcodec.h │ └── version.h ├── libavfilter │ ├── lib │ │ └── x86 │ │ └── libavfilter.a │ ├── avfiltergraph.h │ └── avfilter.h ├── libavformat │ ├── lib │ │ └── x86 │ │ └── libavformat.a │ ├── avformat.h │ ├── avio.h │ └── version.h ├── libavutil │ ├── lib │ │ └── x86 │ │ └── libavutil.a │ ├── attributes.h │ ├── avconfig.h │ ├── avutil.h │ ├── buffer.h │ ├── buffer_internal.h │ ├── camellia.h │ ├── cast5.h │ ├── channel_layout.h │ ├── colorspace.h │ ├── color_utils.h │ ├── common.h │ ├── cpu.h │ ├── cpu_internal.h │ ├── crc.h │ ├── des.h │ ├── dict.h │ ├── display.h │ ├── downmix_info.h │ ├── dynarray.h │ ├── error.h │ ├── eval.h │ ├── ffmath.h │ ├── ffversion.h │ ├── fifo.h │ ├── file.h │ ├── fixed_dsp.h │ ├── float_dsp.h │ ├── frame.h │ ├── hash.h │ ├── hmac.h │ ├── hwcontext_cuda.h │ ├── hwcontext_cuda_internal.h │ ├── hwcontext_dxva2.h │ ├── hwcontext.h │ ├── hwcontext_internal.h │ ├── hwcontext_qsv.h │ ├── hwcontext_vaapi.h │ ├── hwcontext_vdpau.h │ ├── imgutils.h │ ├── integer.h │ ├── internal.h │ ├── intfloat.h │ ├── intmath.h │ ├── intreadwrite.h │ ├── lfg.h │ ├── libm.h │ ├── lls.h │ ├── log.h │ ├── lzo.h │ ├── macros.h │ ├── mastering_display_metadata.h │ ├── mathematics.h │ ├── md5.h │ ├── mem.h │ ├── mem_internal.h │ ├── motion_vector.h │ ├── murmur3.h │ ├── opencl.h │ ├── opencl_internal.h │ ├── opt.h │ ├── parseutils.h │ ├── pca.h │ ├── pixdesc.h │ ├── pixelutils.h │ ├── pixfmt.h │ ├── qsort.h │ ├── random_seed.h │ ├── rational.h │ ├── rc4.h │ ├── replaygain.h │ ├── reverse.h │ ├── ripemd.h │ ├── samplefmt.h │ ├── sha512.h │ ├── sha.h │ ├── softfloat.h │ ├── softfloat_ieee754.h │ ├── softfloat_tables.h │ ├── spherical.h │ ├── stereo3d.h │ ├── tablegen.h │ ├── tea.h │ ├── thread.h │ ├── threadmessage.h │ ├── timecode.h │ ├── time.h │ ├── time_internal.h │ ├── timer.h │ ├── timestamp.h │ ├── tree.h │ ├── twofish.h │ └── version.h └── libswresample ├── lib │ └── x86 │ └── libswresample.a ├── swresample.h └── swresample_internal.hI edited my cmake to include the libraries:
add_library( native-lib SHARED src/main/cpp/native-lib.cpp ) set(distribution_DIR ${CMAKE_SOURCE_DIR}/../distribution) add_library(lib_avcodec STATIC IMPORTED) set_target_properties(lib_avcodec PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/libavcodec/lib/${ANDROID_ABI}/libavcodec.a) add_library(lib_avfilter STATIC IMPORTED) set_target_properties(lib_avfilter PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/libavfilter/lib/${ANDROID_ABI}/libavfilter.a) add_library(lib_avformat STATIC IMPORTED) set_target_properties(lib_avformat PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/libavformat/lib/${ANDROID_ABI}/libavformat.a) add_library(lib_avutil STATIC IMPORTED) set_target_properties(lib_avutil PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/libavutil/lib/${ANDROID_ABI}/libavutil.a) add_library(lib_swresample STATIC IMPORTED) set_target_properties(lib_swresample PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/libswresample/lib/${ANDROID_ABI}/libswresample.a) include_directories( ${distribution_DIR} ) target_link_libraries( native-lib lib_avcodec lib_avfilter lib_avformat lib_avutil lib_swresample )I also restricted the build to only x86, in my app build.gradle :
ndk { // Specifies the ABI configurations of your native // libraries Gradle should build and package with your APK. abiFilters 'x86' }The project gradle sync worked successfully.
I wrote the following code in my cpp file :#include extern "C"{ #include "libavformat/avformat.h" } JNIEXPORT void JNICALL Java_com_example_david_testffmpegcpp_MainActivity_stringFromJNI( JNIEnv *env, jobject /* this */) { av_register_all (); avformat_network_init (); }Just to check if the library works, but i cant seem to link against the libraries correctly. It complains about undefined symbols. What did i do wrong ?
Error :
[2/2] Linking CXX shared library ..\..\..\..\build\intermediates\cmake\debug\obj\x86\libnative-lib.so FAILED: cmd.exe /C "cd . && D:\AndroidSDK\ndk-bundle\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++.exe --target=i686-none-linux-android --gcc-toolchain=D:/AndroidSDK/ndk-bundle/toolchains/x86-4.9/prebuilt/windows-x86_64 --sysroot=D:/AndroidSDK/ndk-bundle/platforms/android-16/arch-x86 -fPIC -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -mstackrealign -Wa,--noexecstack -Wformat -Werror=format-security -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -mstackrealign -Wa,--noexecstack -Wformat -Werror=format-security -O0 -fno-limit-debug-info -O0 -fno-limit-debug-info -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,libnative-lib.so -o ..\..\..\..\build\intermediates\cmake\debug\obj\x86\libnative-lib.so CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o -llog ../../../../../distribution/libavcodec/lib/x86/libavcodec.a ../../../../../distribution/libavfilter/lib/x86/libavfilter.a ../../../../../distribution/libavformat/lib/x86/libavformat.a ../../../../../distribution/libavutil/lib/x86/libavutil.a ../../../../../distribution/libswresample/lib/x86/libswresample.a -lm "D:/AndroidSDK/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/libs/x86/libgnustl_static.a" && cd ." src/libavformat/allformats.c:51: error: undefined reference to 'avcodec_register_all' src/libavformat/id3v2.c:1009: error: undefined reference to 'uncompress' src/libavformat/id3v2.c:1153: error: undefined reference to 'av_init_packet' src/libavformat/matroskadec.c:1393: error: undefined reference to 'inflateInit_' src/libavformat/matroskadec.c:1408: error: undefined reference to 'inflate' src/libavformat/matroskadec.c:1401: error: undefined reference to 'inflateEnd' src/libavformat/matroskadec.c:1411: error: undefined reference to 'inflateEnd' src/libavformat/matroskadec.c:3113: error: undefined reference to 'av_new_packet' src/libavformat/matroskadec.c:3134: error: undefined reference to 'av_packet_new_side_data' src/libavformat/matroskadec.c:2855: error: undefined reference to 'av_new_packet' src/libavformat/matroskadec.c:3147: error: undefined reference to 'av_packet_new_side_data' src/libavformat/matroskadec.c:3022: error: undefined reference to 'av_new_packet' src/libavformat/matroskadec.c:3031: error: undefined reference to 'av_packet_new_side_data' src/libavformat/matroskadec.c:3042: error: undefined reference to 'av_packet_new_side_data' src/libavformat/matroskadec.c:3151: error: undefined reference to 'av_packet_unref' src/libavformat/matroskadec.c:2680: error: undefined reference to 'av_packet_unref' src/libavformat/matroskadec.c:963: error: undefined reference to 'av_fast_padded_malloc' src/libavformat/matroskadec.c:2163: error: undefined reference to 'av_get_codec_tag_string' src/libavformat/matroskadec.c:2680: error: undefined reference to 'av_packet_unref' src/libavformat/matroskadec.c:2579: error: undefined reference to 'av_init_packet' src/libavformat/matroskadec.c:2580: error: undefined reference to 'av_new_packet' src/libavformat/matroskadec.c:1715: error: undefined reference to 'avpriv_mpeg4audio_sample_rates' src/libavformat/matroskadec.c:1715: error: undefined reference to 'avpriv_mpeg4audio_sample_rates' src/libavformat/matroskadec.c:1715: error: undefined reference to 'avpriv_mpeg4audio_sample_rates' src/libavformat/matroskadec.c:1866: error: undefined reference to 'avcodec_chroma_pos_to_enum' src/libavformat/matroskadec.c:2680: error: undefined reference to 'av_packet_unref' src/libavformat/matroskaenc.c:2482: error: undefined reference to 'avcodec_get_type' src/libavformat/matroskaenc.c:646: error: undefined reference to 'avpriv_split_xiph_headers' src/libavformat/matroskaenc.c:1066: error: undefined reference to 'av_get_bits_per_sample' src/libavformat/matroskaenc.c:723: error: undefined reference to 'avpriv_mpeg4audio_get_config' src/libavformat/matroskaenc.c:875: error: undefined reference to 'avcodec_enum_to_chroma_pos' src/libavformat/matroskaenc.c:813: error: undefined reference to 'avcodec_get_name' src/libavformat/matroskaenc.c:806: error: undefined reference to 'avcodec_get_name' src/libavformat/matroskaenc.c:824: error: undefined reference to 'avcodec_get_name' ..... -
ffmpeg API muxing h264 endoced frames to mkv
24 mars 2017, par Pawel KHi I'm having some problems with muxing h264 encoded frames into mkv container using code of ffmpeg-3.2.4. I have ended up with the following code that is a mashup of code found on SO and muxing.c example of ffmpeg: (and yes I am aware that it is ugly, no errors checked etc. it is meant to be like that for clarity :) )
char *filename = "out.mkv"; const uint8_t SPS[] = { 0x67, 0x42, 0x40, 0x1F, 0x96, 0x54, 0x02, 0x80, 0x2D, 0xD0, 0x0F, 0x39, 0xEA }; const uint8_t PPS[] = { 0x68, 0xCE, 0x38, 0x80 }; int fps = 5; typedef struct OutputStream { AVStream *st; AVCodecContext *enc; /* pts of the next frame that will be generated */ int64_t next_pts; int samples_count; AVFrame *frame; AVFrame *tmp_frame; float t, tincr, tincr2; struct SwsContext *sws_ctx; struct SwrContext *swr_ctx; } OutputStream; static void avlog_cb(void *s, int level, const char *szFmt, va_list varg) { vprintf(szFmt, varg); } void main() { AVOutputFormat *fmt; AVFormatContext *formatCtx; AVCodec *audio_codec; AVCodec *video_codec; OutputStream video_st = { 0 }; OutputStream audio_st = { 0 }; av_register_all(); av_log_set_level(AV_LOG_TRACE); //av_log_set_callback(avlog_cb); //allocate output and format ctxs avformat_alloc_output_context2(&formatCtx, NULL, NULL, filename); fmt = formatCtx->oformat; //allocate streams video_codec = avcodec_find_encoder(fmt->video_codec); video_st.st = avformat_new_stream(formatCtx, NULL); video_st.st->id = 0; AVCodecContext *codecCtx = avcodec_alloc_context3(video_codec); fmt->video_codec = AV_CODEC_ID_H264; video_st.enc = codecCtx; codecCtx->codec_id = fmt->video_codec; codecCtx->bit_rate = 400000; codecCtx->width = 1080; codecCtx->height = 720; codecCtx->profile = FF_PROFILE_H264_CONSTRAINED_BASELINE; codecCtx->level = 31; video_st.st->time_base = (AVRational){ 1, fps }; codecCtx->time_base = video_st.st->time_base; codecCtx->gop_size = 4; codecCtx->pix_fmt = AV_PIX_FMT_YUV420P; //open video codec codecCtx->extradata_size = 24; codecCtx->extradata = (uint8_t *)av_malloc(codecCtx->extradata_size); uint8_t extra_data_array[] = { 0x01, SPS[1], SPS[2], SPS[3], 0xFF, 0xE1, 0xc0, 0, 0x42, 0x40, 0x1F, 0x96, 0x54, 0x02, 0x80, 0x2D, 0xD0, 0x0F, 0x39, 0xEA, 0x03, 0xCE, 0x38, 0x80 }; memcpy(codecCtx->extradata, extra_data_array, codecCtx->extradata_size); AVCodecContext *c = video_st.enc; AVDictionary *opt = NULL; avcodec_open2(c, video_codec, &opt); avcodec_parameters_from_context(video_st.st->codecpar, c); //open output file avio_open(&formatCtx->pb, filename, AVIO_FLAG_WRITE); //write header int res = avformat_write_header(formatCtx, NULL); //write frames // get the frames from file uint32_t u32frameCnt = 0; do { int8_t i8frame_name[64] = ""; uint8_t *pu8framePtr = NULL; AVPacket pkt = { 0 }; av_init_packet(&pkt); sprintf(i8frame_name, "frames/frame%d.bin", u32frameCnt++); //reading frames from files FILE *ph264Frame = fopen(i8frame_name, "r"); if(NULL == ph264Frame) { goto leave; } //get file size fseek(ph264Frame, 0L, SEEK_END); uint32_t u32file_size = 0; u32file_size = ftell(ph264Frame); fseek(ph264Frame, 0L, SEEK_SET); pu8framePtr = malloc(u32file_size); uint32_t u32readout = fread(pu8framePtr, 1, u32file_size, ph264Frame); //if the read frame is a key frame i.e. nalu hdr type = 5 set it as a key frame if(0x65 == pu8framePtr[4]) { pkt.flags = AV_PKT_FLAG_KEY; } pkt.data = (uint8_t *)pu8framePtr; pkt.size = u32readout; pkt.pts = u32frameCnt; pkt.dts = pkt.pts; av_packet_rescale_ts(&pkt, c->time_base, video_st.st->time_base); pkt.stream_index = video_st.st->index; av_interleaved_write_frame(formatCtx, &pkt); free(pu8framePtr); fclose(ph264Frame); } while(1); leave: av_write_trailer(formatCtx); av_dump_format(formatCtx, 0, filename, 1); avcodec_free_context(&video_st.enc); avio_closep(&formatCtx->pb); avformat_free_context(formatCtx); }It can be compiled with the following command line (after adding headers):
gcc file.c -o test_app -I/usr/local/include -L/usr/local/lib -lxcb-shm -lxcb -lX11 -lx264 -lm -lz -pthread -lswresample -lswscale -lavcodec -lavformat -lavdevice -lavutilThe files that are read are valid annexB stream (valid as in it's playable in vlc after concatenating into file) it is a Constrained Baseline 3.1 profile H264 and it comes from an IPcam's interleaved RTCP/RTP stream (demuxed)
The result is ... well I don't see the picture. I get only black screen with the progress bar and timer running. I don't know if I do something wrong with setting up the codecs and streams, or it's just wrong timestamps.
I know I got them wrong in some manner but I don't understand that fully yet (how to calculate the correct presentation times), i.e. the stream and the codec both contain time_base field, and then I know that the sample rate of the video is 90kHz and the frame rate is 5 fpsOn top of it all the examples I've found have to some extend deprecated parts that change the flow/meaning of the application and that doesn't help at all so thus If anyone could help I would appreciate it (I think not only me I would guess)
Regards, Pawel
