Newest 'libx264' Questions - Stack Overflow
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Why is ffmpeg transcoding speed going down over time ?
24 mars 2021, par Nikola R.I'm executing basic ffmpeg command to transcode input MP4 video to output MP4 video (both using H264 as video codec, and stripping out audio, for simplicity):
ffmpeg -i input-video.mp4 -b:v 20000k -an -vcodec libx264 output-video.mp4Transcoding is initially pretty fast (around 60-70 fps for first 20 or so frames), and then starts dropping steadily, ending at around 30 fps after 5000 frames.
Is this inherent behavior? If so, why does it happen? Also, is there any better option for the command line that would improve speed (besides using -threads)?
Would it be better to cut the input video and process it as smaller chunks, getting overall higher speed per sequence? (I'm afraid that chunking might affect encoder's RD optimization)
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Creating a video from images using ffmpeg libav and libx264 ?
8 mars 2021, par marikanerI am trying to create a video from images using the ffmpeg library. The images have a size of 1920x1080 and are supposed to be encoded with H.264 using a .mkv container. I have come across various problems, thinking I am getting closer to a solution, but this one I am really stuck on. With the settings I use, the first X frames (around 40, depending on what and how many images I use for the video) of my video are not encoded. avcodec_encode_video2 does not return any error (return value is 0) with got_picture_ptr = 0. The result is a video that actually looks as expected, but the first seconds are weirdly jumpy.
So this is how I create the video file:
// m_codecContext is an instance variable of type AVCodecContext * // m_formatCtx is an instance variable of type AVFormatContext * // outputFileName is a valid filename ending with .mkv AVOutputFormat *oformat = av_guess_format(NULL, outputFileName, NULL); if (oformat == NULL) { oformat = av_guess_format("mpeg", NULL, NULL); } // oformat->video_codec is AV_CODEC_ID_H264 AVCodec *codec = avcodec_find_encoder(oformat->video_codec); m_codecContext = avcodec_alloc_context3(codec); m_codecContext->codec_id = oformat->video_codec; m_codecContext->codec_type = AVMEDIA_TYPE_VIDEO; m_codecContext->gop_size = 30; m_codecContext->bit_rate = width * height * 4 m_codecContext->width = width; m_codecContext->height = height; m_codecContext->time_base = (AVRational){1,frameRate}; m_codecContext->max_b_frames = 1; m_codecContext->pix_fmt = AV_PIX_FMT_YUV420P; m_formatCtx = avformat_alloc_context(); m_formatCtx->oformat = oformat; m_formatCtx->video_codec_id = oformat->video_codec; snprintf(m_formatCtx->filename, sizeof(m_formatCtx->filename), "%s", outputFileName); AVStream *videoStream = avformat_new_stream(m_formatCtx, codec); if(!videoStream) { printf("Could not allocate stream\n"); } videoStream->codec = m_codecContext; if(m_formatCtx->oformat->flags & AVFMT_GLOBALHEADER) { m_codecContext->flags |= CODEC_FLAG_GLOBAL_HEADER; } avcodec_open2(m_codecContext, codec, NULL) < 0); avio_open(&m_formatCtx->pb, outputFileName.toStdString().c_str(), AVIO_FLAG_WRITE); avformat_write_header(m_formatCtx, NULL);this is how the frames are added:
void VideoCreator::writeImageToVideo(const QSharedPointer&img, int frameIndex) { AVFrame *frame = avcodec_alloc_frame(); /* alloc image and output buffer */ int size = m_codecContext->width * m_codecContext->height; int numBytes = avpicture_get_size(m_codecContext->pix_fmt, m_codecContext->width, m_codecContext->height); uint8_t *outbuf = (uint8_t *)malloc(numBytes); uint8_t *picture_buf = (uint8_t *)av_malloc(numBytes); int ret = av_image_fill_arrays(frame->data, frame->linesize, picture_buf, m_codecContext->pix_fmt, m_codecContext->width, m_codecContext->height, 1); frame->data[0] = picture_buf; frame->data[1] = frame->data[0] + size; frame->data[2] = frame->data[1] + size/4; frame->linesize[0] = m_codecContext->width; frame->linesize[1] = m_codecContext->width/2; frame->linesize[2] = m_codecContext->width/2; fflush(stdout); for (int y = 0; y < m_codecContext->height; y++) { for (int x = 0; x < m_codecContext->width; x++) { unsigned char b = img->bits()[(y * m_codecContext->width + x) * 4 + 0]; unsigned char g = img->bits()[(y * m_codecContext->width + x) * 4 + 1]; unsigned char r = img->bits()[(y * m_codecContext->width + x) * 4 + 2]; unsigned char Y = (0.257 * r) + (0.504 * g) + (0.098 * b) + 16; frame->data[0][y * frame->linesize[0] + x] = Y; if (y % 2 == 0 && x % 2 == 0) { unsigned char V = (0.439 * r) - (0.368 * g) - (0.071 * b) + 128; unsigned char U = -(0.148 * r) - (0.291 * g) + (0.439 * b) + 128; frame->data[1][y/2 * frame->linesize[1] + x/2] = U; frame->data[2][y/2 * frame->linesize[2] + x/2] = V; } } } int pts = frameIndex;//(1.0 / 30.0) * 90.0 * frameIndex; frame->pts = pts;//av_rescale_q(m_codecContext->coded_frame->pts, m_codecContext->time_base, formatCtx->streams[0]->time_base); //(1.0 / 30.0) * 90.0 * frameIndex; int got_packet_ptr; AVPacket packet; av_init_packet(&packet); packet.data = outbuf; packet.size = numBytes; packet.stream_index = formatCtx->streams[0]->index; packet.flags |= AV_PKT_FLAG_KEY; packet.pts = packet.dts = pts; m_codecContext->coded_frame->pts = pts; ret = avcodec_encode_video2(m_codecContext, &packet, frame, &got_packet_ptr); if (got_packet_ptr != 0) { m_codecContext->coded_frame->pts = pts; // Set the time stamp if (m_codecContext->coded_frame->pts != (0x8000000000000000LL)) { pts = av_rescale_q(m_codecContext->coded_frame->pts, m_codecContext->time_base, formatCtx->streams[0]->time_base); } packet.pts = pts; if(m_codecContext->coded_frame->key_frame) { packet.flags |= AV_PKT_FLAG_KEY; } std::cout << "pts: " << packet.pts << ", dts: " << packet.dts << std::endl; av_interleaved_write_frame(formatCtx, &packet); av_free_packet(&packet); } free(picture_buf); free(outbuf); av_free(frame); printf("\n"); } and this is the cleanup:
int numBytes = avpicture_get_size(m_codecContext->pix_fmt, m_codecContext->width, m_codecContext->height); int got_packet_ptr = 1; int ret; // for(; got_packet_ptr != 0; i++) while (got_packet_ptr) { uint8_t *outbuf = (uint8_t *)malloc(numBytes); AVPacket packet; av_init_packet(&packet); packet.data = outbuf; packet.size = numBytes; ret = avcodec_encode_video2(m_codecContext, &packet, NULL, &got_packet_ptr); if (got_packet_ptr) { av_interleaved_write_frame(m_formatCtx, &packet); } av_free_packet(&packet); free(outbuf); } av_write_trailer(formatCtx); avcodec_close(m_codecContext); av_free(m_codecContext); printf("\n");I assume it might be tied to the PTS and DTS values, but I have tried EVERYTHING. The frame index seems to make the most sense. The images are correct, I can save them to files without any problems. I am running out of ideas. I would be incredibly thankful if there was someone out there who knew better than me...
Cheers, marikaner
UPDATE:
If this is of any help this is the output at the end of the video encoding:
[libx264 @ 0x7fffc00028a0] frame I:19 Avg QP:14.24 size:312420 [libx264 @ 0x7fffc00028a0] frame P:280 Avg QP:19.16 size:148867 [libx264 @ 0x7fffc00028a0] frame B:181 Avg QP:21.31 size: 40540 [libx264 @ 0x7fffc00028a0] consecutive B-frames: 24.6% 75.4% [libx264 @ 0x7fffc00028a0] mb I I16..4: 30.9% 45.5% 23.7% [libx264 @ 0x7fffc00028a0] mb P I16..4: 4.7% 9.1% 4.5% P16..4: 23.5% 16.6% 12.6% 0.0% 0.0% skip:28.9% [libx264 @ 0x7fffc00028a0] mb B I16..4: 0.6% 0.5% 0.3% B16..8: 26.7% 11.0% 5.5% direct: 3.9% skip:51.5% L0:39.4% L1:45.0% BI:15.6% [libx264 @ 0x7fffc00028a0] final ratefactor: 19.21 [libx264 @ 0x7fffc00028a0] 8x8 transform intra:48.2% inter:47.3% [libx264 @ 0x7fffc00028a0] coded y,uvDC,uvAC intra: 54.9% 53.1% 30.4% inter: 25.4% 13.5% 4.2% [libx264 @ 0x7fffc00028a0] i16 v,h,dc,p: 41% 29% 11% 19% [libx264 @ 0x7fffc00028a0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 26% 31% 3% 4% 3% 7% 3% 6% [libx264 @ 0x7fffc00028a0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 30% 26% 14% 4% 5% 4% 7% 4% 7% [libx264 @ 0x7fffc00028a0] i8c dc,h,v,p: 58% 26% 13% 3% [libx264 @ 0x7fffc00028a0] Weighted P-Frames: Y:17.1% UV:3.6% [libx264 @ 0x7fffc00028a0] ref P L0: 63.1% 21.4% 11.4% 4.1% 0.1% [libx264 @ 0x7fffc00028a0] ref B L0: 85.7% 14.3% [libx264 @ 0x7fffc00028a0] kb/s:27478.30 -
Convert .mp4 to .ts using H264 at constant framerate 25fps [closed]
4 mars 2021, par losing-my-marblesI've been trying to do this conversion for a couple of days reading through forums
ffmpeg -i in1.mp4 -vcodec libx264 -s 720x576 -vf "fps=25"-vsync cfr -b:v 2300k -acodec aac -b:a 128k out1.tsI've tried the below flags found in other forums.
... -r 25 -vf fps=25 -filter:v fps=25 -filter:v fps=fps=25I then read the file using mediainfo and keep getting the same result;
Frame rate mode : VFR Frame rate mode : Variable Frame rate : 46.875 Frame rate : 46.875 FPS (1024 SPF) -
iOS Build PJSIP with FFmpeg+libx264
22 février 2021, par MeonardoI have built the FFmpeg with libx264 into static libs, here is my directory tree.
./ffmpeg ├── include │ ├── libavcodec │ │ ├── ac3_parser.h │ │ ├── adts_parser.h │ │ ├── avcodec.h │ │ ├── avdct.h │ │ ├── avfft.h │ │ ├── bsf.h │ │ ├── codec.h │ │ ├── codec_desc.h │ │ ├── codec_id.h │ │ ├── codec_par.h │ │ ├── d3d11va.h │ │ ├── dirac.h │ │ ├── dv_profile.h │ │ ├── dxva2.h │ │ ├── jni.h │ │ ├── mediacodec.h │ │ ├── packet.h │ │ ├── qsv.h │ │ ├── vaapi.h │ │ ├── vdpau.h │ │ ├── version.h │ │ ├── videotoolbox.h │ │ ├── vorbis_parser.h │ │ └── xvmc.h │ ├── libavdevice │ │ ├── avdevice.h │ │ └── version.h │ ├── libavfilter │ │ ├── avfilter.h │ │ ├── buffersink.h │ │ ├── buffersrc.h │ │ └── version.h │ ├── libavformat │ │ ├── avformat.h │ │ ├── avio.h │ │ └── version.h │ ├── libavutil │ │ ├── adler32.h │ │ ├── aes.h │ │ ├── aes_ctr.h │ │ ├── attributes.h │ │ ├── audio_fifo.h │ │ ├── avassert.h │ │ ├── avconfig.h │ │ ├── avstring.h │ │ ├── avutil.h │ │ ├── base64.h │ │ ├── blowfish.h │ │ ├── bprint.h │ │ ├── bswap.h │ │ ├── buffer.h │ │ ├── camellia.h │ │ ├── cast5.h │ │ ├── channel_layout.h │ │ ├── common.h │ │ ├── cpu.h │ │ ├── crc.h │ │ ├── des.h │ │ ├── dict.h │ │ ├── display.h │ │ ├── dovi_meta.h │ │ ├── downmix_info.h │ │ ├── encryption_info.h │ │ ├── error.h │ │ ├── eval.h │ │ ├── ffversion.h │ │ ├── fifo.h │ │ ├── file.h │ │ ├── frame.h │ │ ├── hash.h │ │ ├── hdr_dynamic_metadata.h │ │ ├── hmac.h │ │ ├── hwcontext.h │ │ ├── hwcontext_cuda.h │ │ ├── hwcontext_d3d11va.h │ │ ├── hwcontext_drm.h │ │ ├── hwcontext_dxva2.h │ │ ├── hwcontext_mediacodec.h │ │ ├── hwcontext_opencl.h │ │ ├── hwcontext_qsv.h │ │ ├── hwcontext_vaapi.h │ │ ├── hwcontext_vdpau.h │ │ ├── hwcontext_videotoolbox.h │ │ ├── hwcontext_vulkan.h │ │ ├── imgutils.h │ │ ├── intfloat.h │ │ ├── intreadwrite.h │ │ ├── lfg.h │ │ ├── log.h │ │ ├── lzo.h │ │ ├── macros.h │ │ ├── mastering_display_metadata.h │ │ ├── mathematics.h │ │ ├── md5.h │ │ ├── mem.h │ │ ├── motion_vector.h │ │ ├── murmur3.h │ │ ├── opt.h │ │ ├── parseutils.h │ │ ├── pixdesc.h │ │ ├── pixelutils.h │ │ ├── pixfmt.h │ │ ├── random_seed.h │ │ ├── rational.h │ │ ├── rc4.h │ │ ├── replaygain.h │ │ ├── ripemd.h │ │ ├── samplefmt.h │ │ ├── sha.h │ │ ├── sha512.h │ │ ├── spherical.h │ │ ├── stereo3d.h │ │ ├── tea.h │ │ ├── threadmessage.h │ │ ├── time.h │ │ ├── timecode.h │ │ ├── timestamp.h │ │ ├── tree.h │ │ ├── twofish.h │ │ ├── tx.h │ │ ├── version.h │ │ ├── video_enc_params.h │ │ └── xtea.h │ ├── libpostproc │ │ ├── postprocess.h │ │ └── version.h │ ├── libswresample │ │ ├── swresample.h │ │ └── version.h │ ├── libswscale │ │ ├── swscale.h │ │ └── version.h │ └── libx264 │ ├── x264.h │ └── x264_config.h └── lib ├── libavcodec.a ├── libavdevice.a ├── libavfilter.a ├── libavformat.a ├── libavutil.a ├── libpostproc.a ├── libswresample.a ├── libswscale.a └── libx264.aThe final lib was created successfully, no error message in log file, but when I import the lib to my Xcode Project, the linker give me tons of errors(missing symbols like:
Undefined symbol: _pjsua_vid_codec_set_priority). I found thepjsua_vid.ois very small(200Bytes) compare to my pjsip+openh264 build file(was 47KB), perhaps this is the reason cause the link error.Here is my build log: log_file
the build script I am using:
#!/bin/sh # see http://stackoverflow.com/a/3915420/318790 function realpath { echo $(cd $(dirname "$1"); pwd)/$(basename "$1"); } __FILE__=`realpath "$0"` __DIR__=`dirname "${__FILE__}"` # download function download() { "${__DIR__}/download.sh" "$1" "$2" #--no-cache } BASE_DIR="$1" PJSIP_URL="https://github.com/pjsip/pjproject/archive/2.10.zip" #http://www.pjsip.org/release/2.8.0/pjproject-2.8.0.tar.bz2 PJSIP_DIR="$1/src" LIB_PATHS=("pjlib/lib" \ "pjlib-util/lib" \ "pjmedia/lib" \ "pjnath/lib" \ "pjsip/lib" \ "third_party/lib") OPENSSL_PREFIX= FFMPEG_PREFIX= OPENH264_PREFIX= OPUS_PREFIX= while [ "$#" -gt 0 ]; do case $1 in --with-openssl) if [ "$#" -gt 1 ]; then OPENSSL_PREFIX=$(python -c "import os,sys; print os.path.realpath(sys.argv[1])" "$2") shift 2 continue else echo 'ERROR: Must specify a non-empty "--with-openssl PREFIX" argument.' >&2 exit 1 fi ;; --with-openh264) if [ "$#" -gt 1 ]; then OPENH264_PREFIX=$(python -c "import os,sys; print os.path.realpath(sys.argv[1])" "$2") shift 2 continue else echo 'ERROR: Must specify a non-empty "--with-openh264 PREFIX" argument.' >&2 exit 1 fi ;; --with-ffmpeg) if [ "$#" -gt 1 ]; then FFMPEG_PREFIX=$(python -c "import os,sys; print os.path.realpath(sys.argv[1])" "$2") shift 2 continue else echo 'ERROR: Must specify a non-empty "--with-ffmpeg PREFIX" argument.' >&2 exit 1 fi ;; --with-opus) if [ "$#" -gt 1 ]; then OPUS_PREFIX=$(python -c "import os,sys; print os.path.realpath(sys.argv[1])" "$2") shift 2 continue else echo 'ERROR: Must specify a non-empty "--with-opus PREFIX" argument.' >&2 exit 1 fi ;; esac shift done function config_site() { SOURCE_DIR=$1 PJSIP_CONFIG_PATH="${SOURCE_DIR}/pjlib/include/pj/config_site.h" HAS_VIDEO= echo "Creating config_site.h ..." if [ -f "${PJSIP_CONFIG_PATH}" ]; then rm "${PJSIP_CONFIG_PATH}" fi echo "#define PJ_CONFIG_IPHONE 1" >> "${PJSIP_CONFIG_PATH}" echo "#define PJ_HAS_IPV6 1" >> "${PJSIP_CONFIG_PATH}" # Enable IPV6 if [[ ${OPENH264_PREFIX} ]]; then # echo "#define PJMEDIA_HAS_VID_TOOLBOX_CODEC 1" >> "${PJSIP_CONFIG_PATH}" # echo "#define PJMEDIA_HAS_OPENH264_CODEC 1" >> "${PJSIP_CONFIG_PATH}" echo "#define PJMEDIA_HAS_FFMPEG_VID_CODEC 1" >> "${PJSIP_CONFIG_PATH}" HAS_VIDEO=1 fi if [[ ${HAS_VIDEO} ]]; then echo "#define PJMEDIA_HAS_VIDEO 1" >> "${PJSIP_CONFIG_PATH}" echo "#define PJMEDIA_VIDEO_DEV_HAS_OPENGL 1" >> "${PJSIP_CONFIG_PATH}" echo "#define PJMEDIA_VIDEO_DEV_HAS_OPENGL_ES 1" >> "${PJSIP_CONFIG_PATH}" echo "#define PJMEDIA_VIDEO_DEV_HAS_IOS_OPENGL 1" >> "${PJSIP_CONFIG_PATH}" echo "#includeES3/glext.h>" >> "${PJSIP_CONFIG_PATH}" fi echo "#include config_site_sample.h>" >> "${PJSIP_CONFIG_PATH}" } function clean_libs () { ARCH=${1} for SRC_DIR in ${LIB_PATHS[*]}; do DIR="${PJSIP_DIR}/${SRC_DIR}" if [ -d "${DIR}" ]; then rm -rf "${DIR}"/* fi DIR="${PJSIP_DIR}/${SRC_DIR}-${ARCH}" if [ -d "${DIR}" ]; then rm -rf "${DIR}" fi done } function copy_libs () { ARCH=${1} for SRC_DIR in ${LIB_PATHS[*]}; do SRC_DIR="${PJSIP_DIR}/${SRC_DIR}" DST_DIR="${SRC_DIR}-${ARCH}" if [ -d "${DST_DIR}" ]; then rm -rf "${DST_DIR}" fi cp -R "${SRC_DIR}" "${DST_DIR}" rm -rf "${SRC_DIR}"/* # delete files because this directory will be used for the final lipo output done } function _build() { pushd . > /dev/null cd ${PJSIP_DIR} ARCH=$1 LOG=${BASE_DIR}/${ARCH}.log # configure CONFIGURE="./configure-iphone" if [[ ${OPENSSL_PREFIX} ]]; then CONFIGURE="${CONFIGURE} --with-ssl=${OPENSSL_PREFIX}" fi # if [[ ${OPENH264_PREFIX} ]]; then # CONFIGURE="${CONFIGURE} --with-openh264=${OPENH264_PREFIX}" # fi if [[ ${FFMPEG_PREFIX} ]]; then CONFIGURE="${CONFIGURE} --with-ffmpeg=${FFMPEG_PREFIX}" fi if [[ ${OPUS_PREFIX} ]]; then CONFIGURE="${CONFIGURE} --with-opus=${OPUS_PREFIX}" fi # flags if [[ ! ${CFLAGS} ]]; then export CFLAGS= fi if [[ ! ${LDFLAGS} ]]; then export LDFLAGS= fi if [[ ${OPENSSL_PREFIX} ]]; then export CFLAGS="${CFLAGS} -I${OPENSSL_PREFIX}/include" export LDFLAGS="${LDFLAGS} -L${OPENSSL_PREFIX}/lib" fi # if [[ ${OPENH264_PREFIX} ]]; then # export CFLAGS="${CFLAGS} -I${OPENH264_PREFIX}/include" # export LDFLAGS="${LDFLAGS} -L${OPENH264_PREFIX}/lib" # fi if [[ ${FFMPEG_PREFIX} ]]; then export CFLAGS="${CFLAGS} -I${FFMPEG_PREFIX}/include" export LDFLAGS="${LDFLAGS} -L${FFMPEG_PREFIX}/lib" fi export LDFLAGS="${LDFLAGS} -lstdc++" echo "Building for ${ARCH}..." clean_libs ${ARCH} make distclean > ${LOG} 2>&1 ARCH="-arch ${ARCH}" ${CONFIGURE} >> ${LOG} 2>&1 make dep >> ${LOG} 2>&1 make clean >> ${LOG} make lib >> ${LOG} 2>&1 copy_libs ${ARCH} } # function armv7() { # export DEVPATH="`xcrun -sdk iphoneos --show-sdk-platform-path`/Developer" # export CFLAGS="-miphoneos-version-min=8.0" # export LDFLAGS= # _build "armv7" # } # function armv7s() { # export DEVPATH="`xcrun -sdk iphoneos --show-sdk-platform-path`/Developer" # export CFLAGS="-miphoneos-version-min=8.0" # export LDFLAGS= # _build "armv7s" # } function arm64() { export DEVPATH="`xcrun -sdk iphoneos --show-sdk-platform-path`/Developer" export CFLAGS="-miphoneos-version-min=8.0" export LDFLAGS= _build "arm64" } function i386() { export DEVPATH="`xcrun -sdk iphonesimulator --show-sdk-platform-path`/Developer" export CFLAGS="-O2 -m32 -mios-simulator-version-min=8.0" export LDFLAGS="-O2 -m32 -mios-simulator-version-min=8.0" _build "i386" } function x86_64() { export DEVPATH="`xcrun -sdk iphonesimulator --show-sdk-platform-path`/Developer" export CFLAGS="-O2 -m32 -mios-simulator-version-min=8.0" export LDFLAGS="-O2 -m32 -mios-simulator-version-min=8.0" _build "x86_64" } function lipo() { TMP=`mktemp -t lipo` echo "Lipo libs... (${TMP})" for LIB_DIR in ${LIB_PATHS[*]}; do # loop over libs DST_DIR="${PJSIP_DIR}/${LIB_DIR}" # use the first architecture to find all libraries PATTERN_DIR="${DST_DIR}-$1" for PATTERN_FILE in `ls -l1 "${PATTERN_DIR}"`; do OPTIONS="" # loop over all architectures and collect the current library for ARCH in "$@"; do FILE="${DST_DIR}-${ARCH}/${PATTERN_FILE/-$1-/-${ARCH}-}" if [ -e "${FILE}" ]; then OPTIONS="$OPTIONS -arch ${ARCH} ${FILE}" fi done if [ "$OPTIONS" != "" ]; then OUTPUT_PREFIX=$(dirname "${DST_DIR}") OUTPUT="${OUTPUT_PREFIX}/lib/${PATTERN_FILE/-$1-/-}" OPTIONS="${OPTIONS} -create -output ${OUTPUT}" echo "$OPTIONS" >> "${TMP}" fi done done while read LINE; do xcrun -sdk iphoneos lipo ${LINE} done < "${TMP}" } # download "${PJSIP_URL}" "${PJSIP_DIR}" config_site "${PJSIP_DIR}" arm64 && i386 && x86_64 lipo arm64 i386 x86_64 Thanks for any advice.
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Generating all P frame intra refresh H264 with x264
3 février 2021, par AndrewI am trying to generate a periodic intra refresh h264 stream with only P frames using ffmpeg and x264 but I always get an I frame at the start.
Is there a way with x264 to create a P frame only stream?
Commands I am using:
ffmpeg -f lavfi -re -i testsrc=duration=5:size=1920x1080:rate=30000/1001 -s 1920x1080 -pix_fmt yuv420p -f rawvideo out.yuv x264 --input-res 1920x1080 --intra-refresh out.yuv --b-pyramid none -b 0 --ref 0 -o out.264Verification:
ffprobe -show_frames out.264 |grep pict_type=IOr just looking at the x264 output e.g.
yuv [info]: 1920x1080p 0:0 @ 25/1 fps (cfr) x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 x264 [info]: profile High, level 4.0, 4:2:0, 8-bit x264 [info]: frame I:1 Avg QP:13.63 size: 12189 x264 [info]: frame P:149 Avg QP:13.59 size: 874 x264 [info]: mb I I16..4: 78.7% 18.6% 2.7% x264 [info]: mb P I16..4: 2.3% 0.1% 0.0% P16..4: 3.2% 0.3% 0.0% 0.0% 0.0% skip:94.1% x264 [info]: 8x8 transform intra:7.6% inter:91.5% x264 [info]: coded y,uvDC,uvAC intra: 1.3% 18.9% 3.6% inter: 0.1% 1.1% 0.1% x264 [info]: i16 v,h,dc,p: 86% 6% 1% 7% x264 [info]: i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 42% 22% 36% 0% 0% 0% 0% 0% 0% x264 [info]: i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 29% 30% 32% 3% 1% 3% 0% 3% 0% x264 [info]: i8c dc,h,v,p: 28% 7% 55% 9% x264 [info]: Weighted P-Frames: Y:0.0% UV:0.0% x264 [info]: kb/s:189.96 encoded 150 frames, 66.76 fps, 189.96 kb/s
