“Invalid data found when processing input” does not identify the cause on its own. FFmpeg uses that wording for the error code AVERROR_INVALIDDATA. To diagnose a YouTube Live stream failure, find the first error in the full FFmpeg log and determine whether it occurs while opening the input, opening a decoder, or later in processing. The message alone does not show that YouTube or your stream key is at fault.
What the error tells you—and what it does not
FFmpeg’s version 7.1 error-code documentation, generated August 22, 2025, gives AVERROR_INVALIDDATA the text “Invalid data found when processing input.” That identifies an error category, not a specific broken file, codec, device, network source, or YouTube setting.
The error can arise in different contexts. A historical FFmpeg-user report from October 30, 2017, describes it during an H.264 decoder failure in an RTSP-to-RTMP workflow; the log included sps_id 0 out of range. That example shows why decoder diagnostics can matter, but it does not establish the cause of a current YouTube Live problem.
Diagnose the failure in order
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Locate the first failure in the complete log
Keep the messages immediately before and after the error. Look for whether FFmpeg was opening an input, initializing a decoder, or already processing media. The adjacent messages may identify the input stream or stage more precisely than the summary text.
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Identify the input that is failing
Record whether the input is a media file, network stream, capture device, or another source. Check the input URL or device and the selected stream in the command. The error wording does not tell you which input is implicated.
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Probe a file input before attempting a repair
If the failing input is a media file, use
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ffprobe -hide_banner "input-file"Replace
input-filewith the file path. Check whether the output identifies a format and the audio or video streams you expect. A recent FFmpeg Cookbook article, published June 27, 2026 and updated September 24, 2026, recommends probing a file before trying to repair it. It lists incomplete or damaged data, non-media content, and unsupported or unusual containers as possible file-related explanations—not confirmed causes of this YouTube Live error. -
For a live or device input, inspect the relevant diagnostics
A simple file-oriented probe may not work for every live URL: access, timing, or protocol requirements can affect probing. Use the command’s input-specific messages and any decoder diagnostics to narrow down the stage. If the log identifies a decoder failure, examine those details rather than assuming that the YouTube destination is responsible.
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Change settings only after identifying the stage
The error by itself does not justify a re-encode, a hardware change, or edits to YouTube ingest settings. First establish which input and processing stage produced it. The available evidence does not establish a particular fix, bitrate, resolution, keyframe interval, or stream-key change for this case.
What to include when asking for help
The exact cause cannot be determined from the error phrase alone. To make the problem diagnosable, provide:
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- The full FFmpeg command, with private stream keys, credentials, and sensitive URL parameters removed.
- The complete log around the first failure, not only the final error line.
- Your FFmpeg build or version and the input type and protocol.
- For a file input, the relevant
ffprobeoutput; for a live or device input, the input and decoder diagnostics.
These details help distinguish input-opening, decoder-opening, and later processing failures. Without them, a specific root cause remains unresolved.
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