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Sur d’autres sites (5854)

  • FFMPEG RTSP stream to MPEG4/H264 file using libx264

    4 décembre 2016, par Phi

    Heyo folks,

    I’m attempting to transcode/remux an RTSP stream in H264 format into a MPEG4 container, containing just the H264 video stream. Basically, webcam output into a MP4 container.

    I can get a poorly coded MP4 produced, using this code :

    // Variables here for demo
    
AVFormatContext * video_file_output_format = nullptr;
    
AVFormatContext * rtsp_format_context = nullptr;
    
AVCodecContext * video_file_codec_context = nullptr;
    
AVCodecContext * rtsp_vidstream_codec_context = nullptr;
    
AVPacket packet = {0};
    
AVStream * video_file_stream = nullptr;
    
AVCodec * rtsp_decoder_codec = nullptr;
    
int errorNum = 0, video_stream_index = 0;
    
std::string outputMP4file = "D:\\somemp4file.mp4";
    

    
// begin
    
AVDictionary * opts = nullptr;
    
av_dict_set(&opts, "rtsp_transport", "tcp", 0);
    

    
if ((errorNum = avformat_open_input(&rtsp_format_context, uriANSI.c_str(), NULL, &opts)) < 0) {
    
    errOut << "Connection failed: avformat_open_input failed with error " << errorNum << ":\r\n" << ErrorRead(errorNum);
    
    TacticalAbort();
    
    return;
    
}
    

    
rtsp_format_context->max_analyze_duration = 50000;
    
if ((errorNum = avformat_find_stream_info(rtsp_format_context, NULL)) < 0) {
    
    errOut << "Connection failed: avformat_find_stream_info failed with error " << errorNum << ":\r\n" << ErrorRead(errorNum);
    
    TacticalAbort();
    
    return;
    
}
    

    
video_stream_index = errorNum = av_find_best_stream(rtsp_format_context, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
    

    
if (video_stream_index < 0) {
    
    errOut << "Connection in unexpected state; made a connection, but there was no video stream.\r\n"
    
        "Attempts to find a video stream resulted in error " << errorNum << ": " << ErrorRead(errorNum);
    
    TacticalAbort();
    
    return;
    
}
    

    
rtsp_vidstream_codec_context = rtsp_format_context->streams[video_stream_index]->codec;
    

    
av_init_packet(&packet);
    

    
if (!(video_file_output_format = av_guess_format(NULL, outputMP4file.c_str(),  NULL))) {
    
    TacticalAbort();
    
    throw std::exception("av_guess_format");
    
}
    

    
if (!(rtsp_decoder_codec = avcodec_find_decoder(rtsp_vidstream_codec_context->codec_id))) {
    
    errOut << "Connection failed: connected, but avcodec_find_decoder returned null.\r\n"
    
        "Couldn't find codec with an AV_CODEC_ID value of " << rtsp_vidstream_codec_context->codec_id << ".";
    
    TacticalAbort();
    
    return;
    
}
    

    
video_file_format_context = avformat_alloc_context();
    
video_file_format_context->oformat = video_file_output_format;
    

    
if (strcpy_s(video_file_format_context->filename, sizeof(video_file_format_context->filename), outputMP4file.c_str())) {
    
    errOut << "Couldn't open video file: strcpy_s failed with error " << errno << ".";
    
    std::string log = errOut.str();
    
    TacticalAbort();
    
    throw std::exception("strcpy_s");
    
}
    

    
if (!(video_file_encoder_codec = avcodec_find_encoder(video_file_output_format->video_codec))) {
    
    TacticalAbort();
    
    throw std::exception("avcodec_find_encoder");
    
}
    

    
// MARKER ONE
    

    
if (!outputMP4file.empty() &&
    
    !(video_file_output_format->flags & AVFMT_NOFILE) &&
    
    (errorNum = avio_open2(&video_file_format_context->pb, outputMP4file.c_str(), AVIO_FLAG_WRITE, nullptr, &opts)) < 0) {
    
    errOut << "Couldn't open video file \"" << outputMP4file << "\" for writing : avio_open2 failed with error " << errorNum << ": " << ErrorRead(errorNum);
    
    TacticalAbort();
    
    return;
    
}
    

    
// Create stream in MP4 file
    
if (!(video_file_stream = avformat_new_stream(video_file_format_context, video_file_encoder_codec))) {
    
    TacticalAbort();
    
    return;
    
}
    

    
AVCodecContext * video_file_codec_context = video_file_stream->codec;
    

    
// MARKER TWO
    

    
// error -22/-21 in avio_open2 if this is skipped
    
if ((errorNum = avcodec_copy_context(video_file_codec_context, rtsp_vidstream_codec_context)) != 0) {
    
    TacticalAbort();
    
    throw std::exception("avcodec_copy_context");
    
}
    

    
//video_file_codec_context->codec_tag = 0;
    

    
/*
    
// MARKER 3 - is this not needed? Examples suggest not.
    
if ((errorNum = avcodec_open2(video_file_codec_context, video_file_encoder_codec, &opts)) < 0)
    
{
    
    errOut << "Couldn't open video file codec context: avcodec_open2 failed with error " << errorNum << ": " << ErrorRead(errorNum);
    
    std::string log = errOut.str();
    
    TacticalAbort();
    
    throw std::exception("avcodec_open2, video file");
    
}*/
    

    
//video_file_format_context->flags |= AVFMT_FLAG_GENPTS;
    
if (video_file_format_context->oformat->flags & AVFMT_GLOBALHEADER)
    
{
    
    video_file_codec_context->flags |= CODEC_FLAG_GLOBAL_HEADER;
    
}
    

    
if ((errorNum = avformat_write_header(video_file_format_context, &opts)) < 0) {
    
    errOut << "Couldn't open video file: avformat_write_header failed with error " << errorNum << ":\r\n" << ErrorRead(errorNum);
    
    std::string log = errOut.str();
    
    TacticalAbort();
    
    return;
    
}

    However, there are several issues :

    1. I can’t pass any x264 options to the output file. The output H264 matches the input H264’s profile/level - switching cameras to a different model switches H264 level.
    2. The timing of the output file is off, noticeably.
    3. The duration of the output file is off, massively. A few seconds of footage becomes hours, although playtime doesn’t match. (FWIW, I’m using VLC to play them.)

    Passing x264 options

    If I manually increment PTS per packet, and set DTS equal to PTS, it plays too fast, 2-3 seconds’ worth of footage in one second playtime, and duration is hours long. The footage also blurs past several seconds, about 10 seconds’ footage in a second.

    If I let FFMPEG decide (with or without GENPTS flag), the file has a variable frame rate (probably as expected), but it plays the whole file in an instant and has a long duration too (over forty hours for a few seconds). The duration isn’t "real", as the file plays in an instant.

    At Marker One, I try to set the profile by passing options to avio_open2. The options are simply ignored by libx264. I’ve tried :

    av_dict_set(&opts, "vprofile", "main", 0);
    
av_dict_set(&opts, "profile", "main", 0); // error, missing '('
    
// FF_PROFILE_H264_MAIN equals 77, so I also tried
    
av_dict_set(&opts, "vprofile", "77", 0); 
    
av_dict_set(&opts, "profile", "77", 0);

    It does seem to read the profile setting, but it doesn’t use them. At Marker Two, I tried to set it after the avio_open2, before avformat_write_header .

    // I tried all 4 av_dict_set from earlier, passing it to avformat_write_header.
    
// None had any effect, they weren't consumed.
    
av_opt_set(video_file_codec_context, "profile", "77", 0);
    
av_opt_set(video_file_codec_context, "profile", "main", 0);
    
video_file_codec_context->profile = FF_PROFILE_H264_MAIN;
    
av_opt_set(video_file_codec_context->priv_data, "profile", "77", 0);
    
av_opt_set(video_file_codec_context->priv_data, "profile", "main", 0);

    Messing with privdata made the program unstable, but I was trying anything at that point.
    I’d like to solve issue 1 with passing settings, since I imagine it’d bottleneck any attempt to solve issues 2 or 3.

    I’ve been fiddling with this for the better part of a month now. I’ve been through dozens of documentation, Q&As, examples. It doesn’t help that quite a few are outdated.

    Any help would be appreciated.

    Cheers

  • FFMPEG RTSP stream to MPEG4/H264 file using libx264

    4 décembre 2016, par Phi

    Heyo folks,

    I’m attempting to transcode/remux an RTSP stream in H264 format into a MPEG4 container, containing just the H264 video stream. Basically, webcam output into a MP4 container.

    I can get a poorly coded MP4 produced, using this code :

    // Variables here for demo
    
AVFormatContext * video_file_output_format = nullptr;
    
AVFormatContext * rtsp_format_context = nullptr;
    
AVCodecContext * video_file_codec_context = nullptr;
    
AVCodecContext * rtsp_vidstream_codec_context = nullptr;
    
AVPacket packet = {0};
    
AVStream * video_file_stream = nullptr;
    
AVCodec * rtsp_decoder_codec = nullptr;
    
int errorNum = 0, video_stream_index = 0;
    
std::string outputMP4file = "D:\\somemp4file.mp4";
    

    
// begin
    
AVDictionary * opts = nullptr;
    
av_dict_set(&opts, "rtsp_transport", "tcp", 0);
    

    
if ((errorNum = avformat_open_input(&rtsp_format_context, uriANSI.c_str(), NULL, &opts)) < 0) {
    
    errOut << "Connection failed: avformat_open_input failed with error " << errorNum << ":\r\n" << ErrorRead(errorNum);
    
    TacticalAbort();
    
    return;
    
}
    

    
rtsp_format_context->max_analyze_duration = 50000;
    
if ((errorNum = avformat_find_stream_info(rtsp_format_context, NULL)) < 0) {
    
    errOut << "Connection failed: avformat_find_stream_info failed with error " << errorNum << ":\r\n" << ErrorRead(errorNum);
    
    TacticalAbort();
    
    return;
    
}
    

    
video_stream_index = errorNum = av_find_best_stream(rtsp_format_context, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
    

    
if (video_stream_index < 0) {
    
    errOut << "Connection in unexpected state; made a connection, but there was no video stream.\r\n"
    
        "Attempts to find a video stream resulted in error " << errorNum << ": " << ErrorRead(errorNum);
    
    TacticalAbort();
    
    return;
    
}
    

    
rtsp_vidstream_codec_context = rtsp_format_context->streams[video_stream_index]->codec;
    

    
av_init_packet(&packet);
    

    
if (!(video_file_output_format = av_guess_format(NULL, outputMP4file.c_str(),  NULL))) {
    
    TacticalAbort();
    
    throw std::exception("av_guess_format");
    
}
    

    
if (!(rtsp_decoder_codec = avcodec_find_decoder(rtsp_vidstream_codec_context->codec_id))) {
    
    errOut << "Connection failed: connected, but avcodec_find_decoder returned null.\r\n"
    
        "Couldn't find codec with an AV_CODEC_ID value of " << rtsp_vidstream_codec_context->codec_id << ".";
    
    TacticalAbort();
    
    return;
    
}
    

    
video_file_format_context = avformat_alloc_context();
    
video_file_format_context->oformat = video_file_output_format;
    

    
if (strcpy_s(video_file_format_context->filename, sizeof(video_file_format_context->filename), outputMP4file.c_str())) {
    
    errOut << "Couldn't open video file: strcpy_s failed with error " << errno << ".";
    
    std::string log = errOut.str();
    
    TacticalAbort();
    
    throw std::exception("strcpy_s");
    
}
    

    
if (!(video_file_encoder_codec = avcodec_find_encoder(video_file_output_format->video_codec))) {
    
    TacticalAbort();
    
    throw std::exception("avcodec_find_encoder");
    
}
    

    
// MARKER ONE
    

    
if (!outputMP4file.empty() &&
    
    !(video_file_output_format->flags & AVFMT_NOFILE) &&
    
    (errorNum = avio_open2(&video_file_format_context->pb, outputMP4file.c_str(), AVIO_FLAG_WRITE, nullptr, &opts)) < 0) {
    
    errOut << "Couldn't open video file \"" << outputMP4file << "\" for writing : avio_open2 failed with error " << errorNum << ": " << ErrorRead(errorNum);
    
    TacticalAbort();
    
    return;
    
}
    

    
// Create stream in MP4 file
    
if (!(video_file_stream = avformat_new_stream(video_file_format_context, video_file_encoder_codec))) {
    
    TacticalAbort();
    
    return;
    
}
    

    
AVCodecContext * video_file_codec_context = video_file_stream->codec;
    

    
// MARKER TWO
    

    
// error -22/-21 in avio_open2 if this is skipped
    
if ((errorNum = avcodec_copy_context(video_file_codec_context, rtsp_vidstream_codec_context)) != 0) {
    
    TacticalAbort();
    
    throw std::exception("avcodec_copy_context");
    
}
    

    
//video_file_codec_context->codec_tag = 0;
    

    
/*
    
// MARKER 3 - is this not needed? Examples suggest not.
    
if ((errorNum = avcodec_open2(video_file_codec_context, video_file_encoder_codec, &opts)) < 0)
    
{
    
    errOut << "Couldn't open video file codec context: avcodec_open2 failed with error " << errorNum << ": " << ErrorRead(errorNum);
    
    std::string log = errOut.str();
    
    TacticalAbort();
    
    throw std::exception("avcodec_open2, video file");
    
}*/
    

    
//video_file_format_context->flags |= AVFMT_FLAG_GENPTS;
    
if (video_file_format_context->oformat->flags & AVFMT_GLOBALHEADER)
    
{
    
    video_file_codec_context->flags |= CODEC_FLAG_GLOBAL_HEADER;
    
}
    

    
if ((errorNum = avformat_write_header(video_file_format_context, &opts)) < 0) {
    
    errOut << "Couldn't open video file: avformat_write_header failed with error " << errorNum << ":\r\n" << ErrorRead(errorNum);
    
    std::string log = errOut.str();
    
    TacticalAbort();
    
    return;
    
}

    However, there are several issues :

    1. I can’t pass any x264 options to the output file. The output H264 matches the input H264’s profile/level - switching cameras to a different model switches H264 level.
    2. The timing of the output file is off, noticeably.
    3. The duration of the output file is off, massively. A few seconds of footage becomes hours, although playtime doesn’t match. (FWIW, I’m using VLC to play them.)

    Passing x264 options

    If I manually increment PTS per packet, and set DTS equal to PTS, it plays too fast, 2-3 seconds’ worth of footage in one second playtime, and duration is hours long. The footage also blurs past several seconds, about 10 seconds’ footage in a second.

    If I let FFMPEG decide (with or without GENPTS flag), the file has a variable frame rate (probably as expected), but it plays the whole file in an instant and has a long duration too (over forty hours for a few seconds). The duration isn’t "real", as the file plays in an instant.

    At Marker One, I try to set the profile by passing options to avio_open2. The options are simply ignored by libx264. I’ve tried :

    av_dict_set(&opts, "vprofile", "main", 0);
    
av_dict_set(&opts, "profile", "main", 0); // error, missing '('
    
// FF_PROFILE_H264_MAIN equals 77, so I also tried
    
av_dict_set(&opts, "vprofile", "77", 0); 
    
av_dict_set(&opts, "profile", "77", 0);

    It does seem to read the profile setting, but it doesn’t use them. At Marker Two, I tried to set it after the avio_open2, before avformat_write_header .

    // I tried all 4 av_dict_set from earlier, passing it to avformat_write_header.
    
// None had any effect, they weren't consumed.
    
av_opt_set(video_file_codec_context, "profile", "77", 0);
    
av_opt_set(video_file_codec_context, "profile", "main", 0);
    
video_file_codec_context->profile = FF_PROFILE_H264_MAIN;
    
av_opt_set(video_file_codec_context->priv_data, "profile", "77", 0);
    
av_opt_set(video_file_codec_context->priv_data, "profile", "main", 0);

    Messing with privdata made the program unstable, but I was trying anything at that point.
    I’d like to solve issue 1 with passing settings, since I imagine it’d bottleneck any attempt to solve issues 2 or 3.

    I’ve been fiddling with this for the better part of a month now. I’ve been through dozens of documentation, Q&As, examples. It doesn’t help that quite a few are outdated.

    Any help would be appreciated.

    Cheers

  • Revert "avformat/utils : Discard huge timestamps which would cause overflows if used...

    26 octobre 2016, par Michael Niedermayer
    Revert "avformat/utils : Discard huge timestamps which would cause overflows if used in basic computations"

    Some people seem to oppose this the patch seems to have been missed for a month on the ML
    
lets restart the discussion and solve this after the release
    

    This reverts commit e936c8d176efd1a0a41e22df24564b1178c79ea9.
    • [DH] libavformat/utils.c

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