Recherche avancée

Sur d’autres sites (10444)

• Convert MP4 Version - FFmpeg

  17 mai 2017, par Luzwitz

  I have two mp4 File :

  1. out.mp4 : ISO Media, MP4 Base Media v1 [IS0 14496-12:2003]
  2. video/rio2016/finale/brasse/200.mp4 : ISO Media, MP4 v2 [ISO 14496-14]

  How can I convert 1 to 2 (mp41 to mp42) ?

  Thanks !

• discord.player ffmpeg process 12040 successfully terminated with return code of 1

  28 novembre 2024, par morichh

  code :

  


  @client.tree.command()
async def play(interaction: Interaction, url: str):
    global voice
    channel = interaction.user.voice.channel
    voice = get(client.voice_clients, Guild=interaction.guild)
    if voice and voice.is_connected():
        await voice.move_to(channel)
        await interaction.response.send_message(f"error")
    else:
        voice = await channel.connect()
        await interaction.response.send_message(f"joined")
    voice.play(discord.FFmpegPCMAudio(executable="C:/ffmpeg/bin/ffmpeg.exe", source = url))    


  


  error :

  


  2022-12-10 19:32:48 INFO     discord.voice_client Connecting to voice...
2022-12-10 19:32:48 INFO     discord.voice_client Starting voice handshake... (connection attempt 1)
2022-12-10 19:32:48 INFO     discord.voice_client Voice handshake complete. Endpoint found russia9326.discord.media
2022-12-10 19:32:50 INFO     discord.player ffmpeg process 12040 successfully terminated with return code of 1.


  


  initially there was an error that ffmpeg was not found, I downloaded it separately, indicated the path to it and now it's coming out like this

  


• How to send ffmpeg AVPacket through WebRTC (using libdatachannel)

  14 novembre 2022, par mike

  I'm encoding a video frame with the ffmpeg libraries, generating an AVPacket with compressed data.

  


  Thanks to some recent advice here on S/O, I am trying to send that frame over a network using the WebRTC library libdatachannel, specifically by adapting the example here :

  


  https://github.com/paullouisageneau/libdatachannel/tree/master/examples/streamer

  


  I am seeing problems inside h264rtppacketizer.cpp (part of the library, not the example) which are almost certainly to do with how I'm providing the sample data.
(I don't think that this is anything to do with libdatachannel specifically, it will be an issue with what I'm sending)

  


  The example code reads each encoded frame from a file, and populates a sample by setting the content of the file to the contents of the file :

  


  sample = *reinterpret_cast *>(&fileContents);

  


  sample is just a std::vector<byte>;</byte>

  


  I have naively copied the contents of an AVPacket->data pointer into the sample vector :

  


  sample.resize(pkt->size);
memcpy(sample.data(), pkt->data, pkt->size * sizeof(std::byte));    


  


  but the packetizer is falling over when trying to get length values out of that data.
Specifically, in the following code, the first iteration gets a length of 1, but the second, looking up index 5, gives 1119887324. This is way too big for my data, which is only 3526 bytes (the whole frame is a single colour so likely to be small once encoded) :

  


  while (index &lt; message->size()) {&#xA;assert(index &#x2B; 4 &lt; message->size());&#xA;auto lengthPtr = (uint32_t *)(message->data() &#x2B; index);&#xA;uint32_t length = ntohl(*lengthPtr);&#xA;auto naluStartIndex = index &#x2B; 4;&#xA;auto naluEndIndex = naluStartIndex &#x2B; length;&#xA;assert(naluEndIndex &lt;= message->size());    &#xA;        &#xA;auto begin = message->begin() &#x2B; naluStartIndex;&#xA;auto end = message->begin() &#x2B; naluEndIndex;&#xA;nalus->push_back(std::make_shared<nalunit>(begin, end));&#xA;index = naluEndIndex;&#xA;}&#xA;</nalunit>

  


  Here is a dump of

  


  uint32_t length = ntohl(*lengthPtr);


  


  for the first few elements of the message (*lengthPtr in parentheses) :

  


  [2022-03-29 15:12:01.182] [info] index 0: 1  (16777216)
[2022-03-29 15:12:01.183] [info] index 1: 359  (1728118784)
[2022-03-29 15:12:01.184] [info] index 2: 91970  (1114046720)
[2022-03-29 15:12:01.186] [info] index 3: 23544512  (3225577217)
[2022-03-29 15:12:01.186] [info] index 4: 1732427807  (532693607)
[2022-03-29 15:12:01.187] [info] index 5: 1119887324  (3693068354)
[2022-03-29 15:12:01.188] [info] index 6: 3223313413  (98312128)
[2022-03-29 15:12:01.188] [info] index 7: 534512896  (384031)
[2022-03-29 15:12:01.188] [info] index 8: 3691315291  (1526728156)
[2022-03-29 15:12:01.189] [info] index 9: 83909537  (2707095557)
[2022-03-29 15:12:01.189] [info] index 10: 6004992  (10574592)
[2022-03-29 15:12:01.190] [info] index 11: 1537277952  (41307)
[2022-03-29 15:12:01.190] [info] index 12: 2701131779  (50331809)
[2022-03-29 15:12:01.192] [info] index 13: 768  (196608)


  


  (I know I should post a complete sample, I am working on it)

  


  


  • I am fairly sure I am just missing something basic. E.g. am I supposed to do something with the AVPacket side_data, does AVPacket have or miss some header info ?

    


  


  • If I just fwrite the pkt->data for a single frame to disk, I can read the codec information with ffprobe :

    


  


  


  Input #0, h264, from 'encodedOut.h264':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: h264 (Constrained Baseline), yuv420p(progressive), 1280x720, 30 tbr, 1200k tbn


  


  Update : This issue is solved by changing the H264RtpPacketizer separator setting from H264RtpPacketizer::Separator::Length to H264RtpPacketizer::Separator::LongStartSequence, many thanks to author of libdatachannel paullouisageneau (see answer below)

  


  I have issues related to settings for the libx264 encoder, but can happily encode with h264_nvenc and h264_mf