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Médias (91)
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Corona Radiata
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Lights in the Sky
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Head Down
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Echoplex
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Discipline
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Letting You
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
Autres articles (85)
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Submit bugs and patches
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Sur d’autres sites (7147)
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lavf/avio : Be more explicit in logging white/black list matches
11 mars 2017, par Alexander Strasserlavf/avio : Be more explicit in logging white/black list matches
The current form of the messages indicating matches in the white
or black lists seems to be a bit too much relying on context.Make the messages more explicit.
Signed-off-by : Alexander Strasser <eclipse7@gmx.net>
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libavformat : calling avformat_open_input 2 times results in decoding white frames
25 avril 2017, par explodus- pre build ffmpeg libs format/util/scale
- version 57.56.101
- don’t use any deprecated function
- use the actual style
- av_read_frame -> avcodec_send_packet -> avcodec_receive_frame -> sws_scale
Everything is fine on the first run, but when i wanna load/open another file i only get white frames.
void video::app::flush_cached_frames() {
if (nullptr == avcontext)
return;
if (nullptr == avpicture)
return;
// send an empty packet which instructs the codec to start flushing
AVPacket pkt;
av_init_packet(&pkt);
pkt.data = NULL;
pkt.size = 0;
avcodec_send_packet(avcontext, &pkt);
// drain the codec
while (true) {
int r = avcodec_receive_frame(avcontext, avpicture);
if (r != 0)
break;
}
}
void video::app::close_avi() {
flush_cached_frames();
if (avformat && avstream)
seek_to_frame(0);
avstream = nullptr;
if (avfile)
fclose(avfile);
avfile = nullptr;
if (avcontext)
avcodec_close(avcontext);
avcontext = nullptr;
if (avformat)
avformat_free_context(avformat);
avformat = nullptr;
if (sws_ctx)
sws_freeContext(sws_ctx);
sws_ctx = nullptr;
if (avparser)
av_parser_close(avparser);
avparser = nullptr;
if (avinbuf)
av_free(avinbuf);
avinbuf = nullptr;
}I think i close anything perfectly. Has anyone an idea ?
edit1 : init/load
unsigned video::app::load(const std::string& name) {
_file = name_;
close_avi();
av_register_all();
avcodec_register_all();
av_init_packet(&avpkt);
AVCodecID codec_id = AV_CODEC_ID_H264;
int64_t duration = 0;
double fps = .0;
int ret = 0;
{
av_log_set_level(1);
avfile = fopen(name_.c_str(), "rb");
avformat = avformat_alloc_context();
ret = avformat_open_input(&avformat, name_.c_str(), nullptr, nullptr);
ret = avformat_find_stream_info(avformat, nullptr);
duration = avformat->duration;
avstream = nullptr;
if (avformat->nb_streams == 1) {
avstream = avformat->streams[0];
} else {
avstream = avformat->streams[av_find_default_stream_index(avformat)];
}
if (avstream) {
fps = (double(avstream->avg_frame_rate.num) / double(avstream->avg_frame_rate.den));
codec_id = avstream->codecpar->codec_id;
duration = avstream->duration;
_vid.v_width = avstream->codecpar->width;
_vid.v_height = avstream->codecpar->height;
_vid.lastframe = duration / fps;
_vid.lastframe = avstream->nb_frames;
}
avcodec = avcodec_find_decoder(avstream->codecpar->codec_id);
avparser = av_parser_init(avcodec->id);
avcontext = avcodec_alloc_context3(avcodec);
avcontext->flags |= AVFMT_FLAG_NONBLOCK;
avcontext->flags |= AVFMT_FLAG_FLUSH_PACKETS;
avcontext->flags |= AVFMT_FLAG_DISCARD_CORRUPT;
avcontext->flags |= AVFMT_FLAG_NOBUFFER;
ret = avcodec_parameters_to_context(avcontext, avstream->codecpar);
ret = avcodec_open2(avcontext, avcodec, nullptr);
// Determine required buffer size and allocate buffer
auto numBytes = av_image_get_buffer_size(
AV_PIX_FMT_BGRA
, avcontext->width
, avcontext->height
, 1);
if (avinbuf)
av_free(avinbuf);
avinbuf = nullptr;
avinbuf = (uint8_t *)av_malloc(numBytes * sizeof(uint8_t));
ret = av_image_fill_arrays(
avrgb->data
, avrgb->linesize
, avinbuf
, AV_PIX_FMT_BGRA
, avcontext->width
, avcontext->height
, 1);
sws_ctx = sws_getContext(
avcontext->width
, avcontext->height
, avcontext->pix_fmt
, avcontext->width
, avcontext->height
, AV_PIX_FMT_BGRA
, SWS_BILINEAR
, nullptr
, nullptr
, nullptr
);
}
int err = (sws_ctx && avcontext && avformat) ? 0 : 1;
// ...
}getting the frame :
uint8_t * video::app::get_frame(uint32_t frame) {
if (!avcontext)
return nullptr;
if (!avformat)
return nullptr;
if (!avpicture)
return nullptr;
if (!avfile)
return nullptr;
try {
int ret = 0;
if (avpicture->data)
av_frame_unref(avpicture);
while (true) {
if ((ret = av_read_frame(avformat, &avpkt)) < 0)
break;
if (avpkt.stream_index == avstream->index) {
ret = avcodec_send_packet(avcontext, &avpkt);
if (ret < 0)
break;
while (ret >= 0) {
ret = avcodec_receive_frame(avcontext, avpicture);
if (ret == AVERROR_EOF) {
return nullptr;
} else if (ret == -11) {
avpkt.data = nullptr;
avpkt.size = 0;
break;
} else if (ret < 0) {
return nullptr;
}
if (ret == AVERROR(EAGAIN)) {
avpkt.data = nullptr;
avpkt.size = 0;
break;
}
if (ret >= 0) {
int linesize[AV_NUM_DATA_POINTERS] = {
avpicture->linesize[0]
, avpicture->linesize[1]
, avpicture->linesize[2]
, avpicture->linesize[3]
, avpicture->linesize[4]
, avpicture->linesize[5]
, avpicture->linesize[6]
, avpicture->linesize[7]
};
uint8_t * data[AV_NUM_DATA_POINTERS] = {
avpicture->data[0]
, avpicture->data[1]
, avpicture->data[2]
, avpicture->data[3]
, avpicture->data[4]
, avpicture->data[5]
, avpicture->data[6]
, avpicture->data[7]
};
{
// flip the frame, never ever touch this thing again!
// If the planes in the image are unequal size(e.g.YUV420) you need to adapt the height.
auto h = avcontext->height;
for (int i = 0; i < 4; i++) {
if (i)
data[i] += linesize[i] * ((h >> 1) - 1);
else
data[i] += linesize[i] * (h - 1);
linesize[i] = -linesize[i];
}
}
ret = sws_scale(
sws_ctx
, (uint8_t const * const *)data
, linesize
, 0
, avcontext->height
, avrgb->data
, avrgb->linesize);
av_packet_unref(&avpkt);
currPts = avpkt.dts;
currPts *= av_q2d(avstream->time_base);
usleep(1000000 * (currPts - prevPts));
prevPts = currPts;
return avrgb->data[0];
}
}
}
av_packet_unref(&avpkt);
}
} catch (...) {
}
return nullptr;
} -
After scaled video, it convert transparent background to white
8 mars 2017, par Sohaib RazaI scaled video using ffmpeg. When i scaled video, the output video having white background ,while the input video having transparent background.
below command using for scaled video.ffmpeg -i inputVideo.mp4 -vf scale=100:100 outputVideo.mp4
you can see the image below that is take from my video,for more understanding my problem.
image from input video
you can see the above image from input video having no white background.
image from output video
you can see the above image from output video having white backgournd.
please give me your valuable answer regarding this question.
any answer will be very appreciate.D: onProgress: configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
D: onProgress: libavutil 55. 17.103 / 55. 17.103
D: onProgress: libavcodec 57. 24.102 / 57. 24.102
D: onProgress: libavformat 57. 25.100 / 57. 25.100
D: onProgress: libavdevice 57. 0.101 / 57. 0.101
D: onProgress: libavfilter 6. 31.100 / 6. 31.100
D: onProgress: libswscale 4. 0.100 / 4. 0.100
D: onProgress: libswresample 2. 0.101 / 2. 0.101
D: onProgress: libpostproc 54. 0.100 / 54. 0.100
D: onProgress: Input #0, gif, from '/storage/emulated/0/Pictures/eye.gif':
D: onProgress: Duration: N/A, bitrate: N/A
D: onProgress: Stream #0:0: Video: gif, bgra, 480x190, 5 fps, 10 tbr, 100 tbn, 100 tbc
D: onProgress: Output #0, gif, to '/storage/emulated/0/GIF/REV20170308_101145.gif':
D: onProgress: Metadata:
D: onProgress: encoder : Lavf57.25.100
D: onProgress: Stream #0:0: Video: gif, bgr8, 125x56, q=2-31, 200 kb/s, 10 fps, 100 tbn, 10 tbc
D: onProgress: Metadata:
D: onProgress: encoder : Lavc57.24.102 gif
D: onProgress: Stream mapping:
D: onProgress: Stream #0:0 -> #0:0 (gif (native) -> gif (native))
D: onProgress: Press [q] to stop, [?] for help
D: onProgress: frame= 11 fps=0.0 q=-0.0 Lsize= 17kB time=00:00:02.90 bitrate= 48.8kbits/s speed=14.8x<br />
D: onProgress: video:16kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 5.287261%
D: Started command : ffmpeg [Ljava.lang.String;@422f62d0
D: onSuccess: ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 4.8 (GCC)
configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
libavutil 55. 17.103 / 55. 17.103
libavcodec 57. 24.102 / 57. 24.102
libavformat 57. 25.100 / 57. 25.100
libavdevice 57. 0.101 / 57. 0.101
libavfilter 6. 31.100 / 6. 31.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, gif, from '/storage/emulated/0/Pictures/eye.gif':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: gif, bgra, 480x190, 5 fps, 10 tbr, 100 tbn, 100 tbc
Output #0, gif, to '/storage/emulated/0/GIF/REV20170308_101145.gif':
Metadata:
encoder : Lavf57.25.100
Stream #0:0: Video: gif, bgr8, 125x56, q=2-31, 200 kb/s, 10 fps, 100 tbn, 10 tbc
Metadata:
encoder : Lavc57.24.102 gif
Stream mapping:
Stream #0:0 -> #0:0 (gif (native) -> gif (native))
Press [q] to stop, [?] for help
frame= 11 fps=0.0 q=-0.0 Lsize= 17kB time=00:00:02.90 bitrate= 48.8kbits/s speed=14.8x<br />
video:16kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 5.287261%
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