Newest 'ffmpeg' Questions - Stack Overflow
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Determine if OpenCV has FFMpeg Support at Configuration Time
17 février 2014, par archgoonI'm building my project with CMake, but I want to throw an error if OPENCV has not been compiled with FFMPEG support (as this will prevent a large amount of functinoality of my application). How can I modify my CMake scripts to check for this?
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Passing FileInputStream and FileOutputStream to ffmpeg to transcode(using JAVE-Java Audio Video Encoding)
17 février 2014, par Jagan SI am trying to transcode a *.mov file into a *.mp4 file using JAVE, which calls ffmpeg. Both input file and output file are in InputStream and OutputStream forms. That means I need to pass InputStream and OutputStream as -i and -y parematers for ffmpeg. How do I do that ?
//Read a movfile.mov converted into a FileInputStream InputStream fileInputStream = getFileInputStream(); OutputStream fileOutputStream = new FileOutputStrea(outputMP4File) //Output Process p = Runtime.exec("ffmpeg -i - -y -"); InputStream pInStrm = p.getInputStream(); OutputStream pOutStrm = p.getOutputStream(); int vin = 0, vout = 0; Thread read = new Thread() { byte[] buff = new byte[4096]; void run() { while ((vin=fileInputStream.read(buf))!=-1) { pOutStrm.write(buf, 0, vin); } } }; read.start(); Thread write = new Thread() { byte[] buff = new byte[4096]; void run() { while ((vout=pInStrm.read(buf))!=-1) { fileOutputStream.write(buf, 0, vout); } } }; write.start();But I keep getting "IOException: pipe is closed" error. Could somebody help me out ? Alternatively if there is any JAVA API that could do this transcoding(on Windows and RedHat Linux), that would be very helpful
Thanks
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use ffmpeg api to convert audio files. crash on avcodec_encode_audio2
17 février 2014, par fabianFrom the examples I got the basic idea of this code. However I am not sure, what I am missing, as muxing.c demuxing.c and decoding_encoding.c all use different approaches.
The process of converting an audio file to another file should go roughly like this: inputfile -demux-> audiostream -read-> inPackets -decode2frames-> frames -encode2packets-> outPackets -write-> audiostream -mux-> outputfile
However I found the following comment in demuxing.c: /* Write the raw audio data samples of the first plane. This works
* fine for packed formats (e.g. AV_SAMPLE_FMT_S16). However,
* most audio decoders output planar audio, which uses a separate
* plane of audio samples for each channel (e.g. AV_SAMPLE_FMT_S16P).
* In other words, this code will write only the first audio channel
* in these cases.
* You should use libswresample or libavfilter to convert the frame
* to packed data. */My questions about this are:
Can I expect a frame that was retrieved by calling one of the decoder functions, f.e. avcodec_decode_audio4 to hold suitable values to directly put it into an encoder or is the resampling step mentioned in the comment mandatory?
Am I taking the right approach? ffmpeg is very asymmetric, i.e. if there is a function open_file_for_input there might not be a function open_file_for_output. Also there are different versions of many functions (avcodec_decode_audio[1-4]) and different naming schemes, so it's very hard to tell, if the general approach is right, or actually an ugly mixture of techniques that where used at different version bumps of ffmpeg.
ffmpeg uses a lot of specific terms, like 'planar sampling' or 'packed format' and I am having a hard time, finding definitions for these terms. Is it possible to write working code, without deep knowledge of audio?
Here is my code so far that right now crashes at avcodec_encode_audio2 and I don't know why.
int Java_com_fscz_ffmpeg_Audio_convert(JNIEnv * env, jobject this, jstring jformat, jstring jcodec, jstring jsource, jstring jdest) { jboolean isCopy; jclass configClass = (*env)->FindClass(env, "com.fscz.ffmpeg.Config"); jfieldID fid = (*env)->GetStaticFieldID(env, configClass, "ffmpeg_logging", "I"); logging = (*env)->GetStaticIntField(env, configClass, fid); /// open input const char* sourceFile = (*env)->GetStringUTFChars(env, jsource, &isCopy); AVFormatContext* pInputCtx; AVStream* pInputStream; open_input(sourceFile, &pInputCtx, &pInputStream); // open output const char* destFile = (*env)->GetStringUTFChars(env, jdest, &isCopy); const char* cformat = (*env)->GetStringUTFChars(env, jformat, &isCopy); const char* ccodec = (*env)->GetStringUTFChars(env, jcodec, &isCopy); AVFormatContext* pOutputCtx; AVOutputFormat* pOutputFmt; AVStream* pOutputStream; open_output(cformat, ccodec, destFile, &pOutputCtx, &pOutputFmt, &pOutputStream); /// decode/encode error = avformat_write_header(pOutputCtx, NULL); DIE_IF_LESS_ZERO(error, "error writing output stream header to file: %s, error: %s", destFile, e2s(error)); AVFrame* frame = avcodec_alloc_frame(); DIE_IF_UNDEFINED(frame, "Could not allocate audio frame"); frame->pts = 0; LOGI("allocate packet"); AVPacket pktIn; AVPacket pktOut; LOGI("done"); int got_frame, got_packet, len, frame_count = 0; int64_t processed_time = 0, duration = pInputStream->duration; while (av_read_frame(pInputCtx, &pktIn) >= 0) { do { len = avcodec_decode_audio4(pInputStream->codec, frame, &got_frame, &pktIn); DIE_IF_LESS_ZERO(len, "Error decoding frame: %s", e2s(len)); if (len < 0) break; len = FFMIN(len, pktIn.size); size_t unpadded_linesize = frame->nb_samples * av_get_bytes_per_sample(frame->format); LOGI("audio_frame n:%d nb_samples:%d pts:%s\n", frame_count++, frame->nb_samples, av_ts2timestr(frame->pts, &(pInputStream->codec->time_base))); if (got_frame) { do { av_init_packet(&pktOut); pktOut.data = NULL; pktOut.size = 0; LOGI("encode frame"); DIE_IF_UNDEFINED(pOutputStream->codec, "no output codec"); DIE_IF_UNDEFINED(frame->nb_samples, "no nb samples"); DIE_IF_UNDEFINED(pOutputStream->codec->internal, "no internal"); LOGI("tests done"); len = avcodec_encode_audio2(pOutputStream->codec, &pktOut, frame, &got_packet); LOGI("encode done"); DIE_IF_LESS_ZERO(len, "Error (re)encoding frame: %s", e2s(len)); } while (!got_packet); // write packet; LOGI("write packet"); /* Write the compressed frame to the media file. */ error = av_interleaved_write_frame(pOutputCtx, &pktOut); DIE_IF_LESS_ZERO(error, "Error while writing audio frame: %s", e2s(error)); av_free_packet(&pktOut); } pktIn.data += len; pktIn.size -= len; } while (pktIn.size > 0); av_free_packet(&pktIn); } LOGI("write trailer"); av_write_trailer(pOutputCtx); LOGI("end"); /// close resources avcodec_free_frame(&frame); avcodec_close(pInputStream->codec); av_free(pInputStream->codec); avcodec_close(pOutputStream->codec); av_free(pOutputStream->codec); avformat_close_input(&pInputCtx); avformat_free_context(pOutputCtx); return 0; } -
Specify background colour when generating movie from images
17 février 2014, par UkoI generate a video from png images using
ffmpeg -i visualization/%d.png -c:v libx264 -vf "scale=500:trunc(ow/a/2)*2" -pix_fmt yuv420p z.movand if images have transparencies, they become black. Can I somehow make them white?
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Static Compilation of FFmpeg with x264 support
17 février 2014, par b1izzardBased on the Tutorial, I tried to build the latest FFmpeg binary with x264 support for Command line execution using Android-ndk-r9c.
I had built the x264 using the below script:
#!/bin/bash PREBUILT=/home/blizzard/bin/android-ndk-r9c/toolchains/arm-linux-androideabi-4.6/prebuilt PLATFORM=/home/blizzard/bin/android-ndk-r9c/platforms/android-9/arch-arm PREFIX=/home/blizzard/bin/android-ndk-r9c/sources/ffmpeg ./configure --prefix=$PREFIX \ --enable-static \ --enable-pic \ --disable-asm \ --disable-cli \ --host=arm-linux \ --cross-prefix=$PREBUILT/linux-x86_64/bin/arm-linux-androideabi- \ --sysroot=$PLATFORM make sudo make install sudo ldconfigFor building FFmpeg I had used the below script:
#!/bin/bash PLATFORM=/home/blizzard/bin/android-ndk-r9c/platforms/android-9/arch-arm PREBUILT=/home/blizzard/bin/android-ndk-r9c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64 PREFIX=/home/blizzard/bin/android-ndk-r9c/sources/ffmpeg function build_one { ./configure --target-os=linux --prefix=$PREFIX \ --arch=arm \ --cpu=cortex-a8 \ --enable-cross-compile \ --enable-runtime-cpudetect \ --disable-asm \ --enable-static \ --disable-shared \ --arch=arm \ --cc=$PREBUILT/bin/arm-linux-androideabi-gcc \ --cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \ --disable-stripping \ --nm=$PREBUILT/bin/arm-linux-androideabi-nm \ --sysroot=$PLATFORM \ --enable-nonfree \ --enable-version3 \ --disable-everything \ --enable-gpl \ --disable-doc \ --enable-avresample \ --enable-demuxer=rtsp \ --enable-muxer=rtsp \ --disable-ffplay \ --disable-ffserver \ --enable-ffmpeg \ --disable-ffprobe \ --enable-libx264 \ --enable-encoder=libx264 \ --enable-decoder=h264 \ --enable-protocol=rtp \ --enable-hwaccels \ --enable-zlib \ --disable-devices \ --disable-avdevice \ --extra-cflags="-I/home/blizzard/bin/android-ndk-r9c/sources/ffmpeg/include -fPIC -DANDROID -D__thumb__ -mthumb -Wfatal-errors -Wno-deprecated -mfloat-abi=softfp -marm -march=armv7-a" \ --extra-ldflags="-L/home/blizzard/bin/android-ndk-r9c/sources/ffmpeg/lib" make -j4 install $PREBUILT/bin/arm-linux-androideabi-ar d libavcodec/libavcodec.a inverse.o $PREBUILT/bin/arm-linux-androideabi-ld -rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -L$PREFIX/lib -soname libffmpeg.so -shared -nostdlib -z noexecstack -Bsymbolic --whole-archive --no-undefined -o $PREFIX/libffmpeg.so libavcodec/libavcodec.a libavfilter/libavfilter.a libavresample/libavresample.a libavformat/libavformat.a libavutil/libavutil.a libswscale/libswscale.a -lc -lm -lz -ldl -llog -lx264 --dynamic-linker=/system/bin/linker $PREBUILT/lib/gcc/arm-linux-androideabi/4.6/libgcc.a } build_oneThe output of the script is
install prefix /home/blizzard/bin/android-ndk-r9c/sources/ffmpeg source path . C compiler /home/blizzard/bin/android-ndk-r9c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc C library bionic host C compiler gcc host C library glibc ARCH c (cortex-a8) big-endian no runtime cpu detection yes debug symbols yes strip symbols no optimize for size no optimizations yes static yes shared no postprocessing support yes new filter support yes network support yes threading support pthreads safe bitstream reader yes SDL support no opencl enabled no libzvbi enabled no texi2html enabled yes perl enabled yes pod2man enabled yes makeinfo enabled no External libraries: libx264 zlib Enabled decoders: h264 Enabled encoders: libx264 Enabled hwaccels: Enabled parsers: Enabled demuxers: asf mpegts rtsp mov rm Enabled muxers: rtp rtsp Enabled protocols: http tcp udp rtp Enabled filters: aformat format setpts anull null trim atrim Enabled bsfs: Enabled indevs: Enabled outdevs: License: nonfree and unredistributable Creating config.mak, config.h, and doc/config.texi... config.h is unchanged libavutil/avconfig.h is unchanged WARNING: /home/blizzard/bin/android-ndk-r9c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/arm-linux-androideabi-pkg-config not found, library detection may fail. INSTALL install-progs-yes INSTALL ffmpeg INSTALL presets/libvpx-1080p50_60.ffpreset INSTALL presets/libvpx-1080p.ffpreset INSTALL presets/libvpx-360p.ffpreset INSTALL presets/libvpx-720p50_60.ffpreset INSTALL presets/libvpx-720p.ffpreset INSTALL presets/libx264-ipod320.ffpreset INSTALL presets/libx264-ipod640.ffpreset INSTALL doc/ffprobe.xsd INSTALL doc/examples/decoding_encoding.c INSTALL doc/examples/demuxing_decoding.c INSTALL doc/examples/filtering_audio.c INSTALL doc/examples/filtering_video.c INSTALL doc/examples/metadata.c INSTALL doc/examples/muxing.c INSTALL doc/examples/remuxing.c INSTALL doc/examples/resampling_audio.c INSTALL doc/examples/scaling_video.c INSTALL doc/examples/transcode_aac.c INSTALL doc/examples/Makefile INSTALL doc/examples/README INSTALL libavfilter/libavfilter.a INSTALL libavformat/libavformat.a INSTALL presets/libvpx-1080p50_60.ffpreset INSTALL presets/libvpx-1080p.ffpreset INSTALL presets/libvpx-360p.ffpreset INSTALL presets/libvpx-720p50_60.ffpreset INSTALL presets/libvpx-720p.ffpreset INSTALL presets/libx264-ipod320.ffpreset INSTALL presets/libx264-ipod640.ffpreset INSTALL doc/ffprobe.xsd INSTALL doc/examples/decoding_encoding.c INSTALL doc/examples/demuxing_decoding.c INSTALL doc/examples/filtering_audio.c INSTALL doc/examples/filtering_video.c INSTALL doc/examples/metadata.c INSTALL doc/examples/muxing.c INSTALL doc/examples/remuxing.c INSTALL doc/examples/resampling_audio.c INSTALL doc/examples/scaling_video.c INSTALL doc/examples/transcode_aac.c INSTALL doc/examples/Makefile INSTALL doc/examples/README INSTALL libavresample/libavresample.a INSTALL libavcodec/libavcodec.a INSTALL libpostproc/libpostproc.a INSTALL libswresample/libswresample.a INSTALL libavutil/libavutil.a a INSTALL libavfilter/asrc_abuffer.h INSTALL libavfilter/avcodec.h INSTALL libavfilter/avfilter.h INSTALL libavfilter/avfiltergraph.h INSTALL libavfilter/buffersink.h INSTALL libavfilter/buffersrc.h INSTALL libavfilter/version.h INSTALL libavformat/avformat.h INSTALL libavformat/avio.h INSTALL libavformat/version.h INSTALL libavfilter/libavfilter.pc INSTALL libavformat/libavformat.pc INSTALL libavresample/avresample.h INSTALL libavresample/version.h INSTALL libavresample/libavresample.pc INSTALL libavcodec/avcodec.h INSTALL libavcodec/avfft.h INSTALL libavcodec/dxva2.h INSTALL libavcodec/old_codec_ids.h INSTALL libavcodec/vaapi.h INSTALL libavcodec/vda.h INSTALL libavcodec/vdpau.h INSTALL libavcodec/version.h INSTALL libavcodec/xvmc.h INSTALL libavcodec/libavcodec.pc INSTALL libpostproc/postprocess.h INSTALL libpostproc/version.h INSTALL libpostproc/libpostproc.pc INSTALL libswresample/swresample.h INSTALL libswresample/version.h INSTALL libswscale/swscale.h INSTALL libswscale/version.h INSTALL libavutil/adler32.h INSTALL libavutil/aes.h INSTALL libavutil/attributes.h INSTALL libavutil/audio_fifo.h INSTALL libavutil/audioconvert.h INSTALL libavutil/avassert.h INSTALL libavutil/avstring.h INSTALL libavutil/avutil.h INSTALL libavutil/base64.h INSTALL libavutil/blowfish.h INSTALL libavutil/bprint.h INSTALL libavutil/bswap.h INSTALL libavutil/buffer.h INSTALL libavutil/channel_layout.h INSTALL libavutil/common.h INSTALL libavutil/cpu.h INSTALL libavutil/crc.h INSTALL libavutil/error.h INSTALL libavutil/eval.h INSTALL libavutil/fifo.h INSTALL libavutil/file.h INSTALL libavutil/frame.h INSTALL libavutil/hmac.h INSTALL libavutil/imgutils.h INSTALL libavutil/intfloat.h INSTALL libavutil/intfloat_readwrite.h INSTALL libavutil/intreadwrite.h INSTALL libavutil/lfg.h INSTALL libavutil/log.h INSTALL libavutil/macros.h INSTALL libavutil/mathematics.h INSTALL libavutil/md5.h INSTALL libavutil/mem.h INSTALL libavutil/murmur3.h INSTALL libavutil/dict.h INSTALL libavutil/old_pix_fmts.h INSTALL libavutil/opt.h INSTALL libavutil/parseutils.h INSTALL libavutil/pixdesc.h INSTALL libavutil/pixfmt.h INSTALL libavutil/random_seed.h INSTALL libavutil/rational.h INSTALL libavutil/ripemd.h INSTALL libavutil/samplefmt.h INSTALL libavutil/sha.h INSTALL libavutil/sha512.h INSTALL libavutil/stereo3d.h INSTALL libavutil/time.h INSTALL libavutil/timecode.h INSTALL libavutil/timestamp.h INSTALL libavutil/version.h INSTALL libavutil/xtea.h INSTALL libavutil/avconfig.h INSTALL libavutil/ffversion.h INSTALL libswresample/libswresample.pc INSTALL libswscale/libswscale.pc INSTALL libavutil/libavutil.pcWhen I tried to execute the following command using the resulting FFmpeg binary in Android Application
ffmpeg -y -loop 1 -r 30 -i myImage.jpg -b:v "4096k" -vf "scale=640:480" -t 3 result.mp4LogCat displays the following message
02-17 15:42:45.683: D/(14511): *******Starting FFMPEG 02-17 15:42:45.683: D/(14511): ***ffmpeg version N-60108-gda25a65 Copyright (c) 2000-2014 the FFmpeg developers*** 02-17 15:42:45.693: D/(14511): *** built on Feb 17 2014 15:35:20 with gcc 4.6 (GCC) 20120106 (prerelease)*** 02-17 15:42:45.693: D/(14511): *** configuration: --target-os=linux --prefix=/home/blizzard/bin/android-ndk-r9c/sources/ffmpeg --arch=arm --cpu=cortex-a8 --enable-cross-compile --enable-runtime-cpudetect --disable-asm --enable-static --disable-shared --arch=arm --cc=/home/blizzard/bin/android-ndk-r9c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc --cross-prefix=/home/blizzard/bin/android-ndk-r9c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/arm-linux-androideabi- --disable-stripping --nm=/home/blizzard/bin/android-ndk-r9c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/arm-linux-androideabi-nm --sysroot=/home/blizzard/bin/android-ndk-r9c/platforms/android-9/arch-arm --enable-nonfree --enable-version3 --disable-everything --enable-gpl --disable-doc --enable-avresample --enable-demuxer=rtsp --enable-muxer=rtsp --disable-ffplay --disable-ffserver --enable-ffmpeg --disable-ffprobe --enable-libx264 --enable-encoder=libx264 --enable-decoder=h264 --enable-protocol=rtp --enable-hwaccels --enable-zlib --disable-devices --disable-avdevice --extra-cflags='-I/home/blizzard/bin/android-ndk-r9c/sources/ffmpeg/include -fPIC -DANDROID -D__thumb__ -mthumb -Wfatal-errors -Wno-deprecated -mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=armv7-a' --extra-ldflags=-L/home/blizzard/bin/android-ndk-r9c/sources/ffmpeg/lib*** 02-17 15:42:45.693: D/(14511): *** libavutil 52. 63.100 / 52. 63.100*** 02-17 15:42:45.693: D/(14511): *** libavcodec 55. 49.100 / 55. 49.100*** 02-17 15:42:45.693: D/(14511): *** libavformat 55. 25.101 / 55. 25.101*** 02-17 15:42:45.693: D/(14511): *** libavfilter 4. 1.100 / 4. 1.100*** 02-17 15:42:45.693: D/(14511): *** libavresample 1. 1. 0 / 1. 1. 0*** 02-17 15:42:45.693: D/(14511): *** libswscale 2. 5.101 / 2. 5.101*** 02-17 15:42:45.693: D/(14511): *** libswresample 0. 17.104 / 0. 17.104*** 02-17 15:42:45.693: D/(14511): *** libpostproc 52. 3.100 / 52. 3.100*** 02-17 15:42:45.693: D/(14511): ***Unrecognized option 'loop'.*** 02-17 15:42:45.693: D/(14511): ***Error splitting the argument list: Option not found*** 02-17 15:42:45.693: D/(14511): ****ending FFMPEG****Can anybody help me in building the latest version of FFmpeg or Can you share the latest FFMpeg binary for Android?
